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    <link:label id="lab_arnc_NetOtherPostRetirementBenefitsMember_1B1C413243ABAFF456123F32B7B4CF0E_terseLabel_en-US" xlink:label="lab_arnc_NetOtherPostRetirementBenefitsMember_1B1C413243ABAFF456123F32B7B4CF0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net Other post- retirement benefits</link:label>
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    <link:label id="lab_arnc_NetOtherPostRetirementBenefitsMember_1B1C413243ABAFF456123F32B7B4CF0E_documentation_en-US" xlink:label="lab_arnc_NetOtherPostRetirementBenefitsMember_1B1C413243ABAFF456123F32B7B4CF0E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Net Other Post-Retirement Benefits [Member]</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_1E15C778BFD1B5469F9A3F32B7B4C70B_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanDisclosureLineItems_1E15C778BFD1B5469F9A3F32B7B4C70B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan Disclosure [Line Items]</link:label>
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    <link:label id="lab_arnc_MinimumRequiredCashContributionToPensionPlan_7252A5118BFE6D9A3AAD3F4A96812B2B_terseLabel_en-US" xlink:label="lab_arnc_MinimumRequiredCashContributionToPensionPlan_7252A5118BFE6D9A3AAD3F4A96812B2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum required cash contribution to pension plan</link:label>
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    <link:label id="lab_arnc_AggregateCashContributionToPensionPlan_B62CB46C4FEF4B8B35D53F32B7B56A49_terseLabel_en-US" xlink:label="lab_arnc_AggregateCashContributionToPensionPlan_B62CB46C4FEF4B8B35D53F32B7B56A49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate cash contribution to pension plan</link:label>
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    <link:label id="lab_us-gaap_PensionAndOtherPostretirementBenefitContributions_3F477FEB0AA388AFFB553F32B7B528E1_terseLabel_en-US" xlink:label="lab_us-gaap_PensionAndOtherPostretirementBenefitContributions_3F477FEB0AA388AFFB553F32B7B528E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Payment for pension and other postretirement benefits</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_40B74BE7AA5CDB8A8BCF3F32B7B68BC1_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_40B74BE7AA5CDB8A8BCF3F32B7B68BC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_CF673B8EC1981E429F783F32B7B6B883_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_CF673B8EC1981E429F783F32B7B6B883" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2021</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrescriptionDrugSubsidyReceiptsNextTwelveMonths" xlink:label="loc_us-gaap_PrescriptionDrugSubsidyReceiptsNextTwelveMonths_21B0887F8CB3F22915723F32B7B7AB82" xlink:type="locator" />
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    <link:label id="lab_arnc_IncreaseDecreaseInSharebasedCompensation_80DDFF3867FFCAF8B1A36EB476B0EA5B_documentation_en-US" xlink:label="lab_arnc_IncreaseDecreaseInSharebasedCompensation_80DDFF3867FFCAF8B1A36EB476B0EA5B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Increase (Decrease) In Share-based Compensation</link:label>
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    <link:label id="lab_us-gaap_OtherNoncashIncomeExpense_97A9553FEA71FF50D8706EB476B0A817_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_97A9553FEA71FF50D8706EB476B0A817" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Noncash Income (Expense)</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_43FBE67D4C5E221C9FC36EB476B0FAF5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_43FBE67D4C5E221C9FC36EB476B0FAF5" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_43FBE67D4C5E221C9FC36EB476B0FAF5" xlink:type="arc" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_A4C869D6F084354A6DF76EB476B14420_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_A4C869D6F084354A6DF76EB476B14420" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Receivables</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_A4C869D6F084354A6DF76EB476B14420" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_E76719712919AA799E7D6EB476B17C78" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_82C50E617C5AA020C7606EB476B1B07A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableTrade" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableTrade_41639A856B41725D50726EB476B121B3" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_5E8EDE938406EE16BD326EB476B25382" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_A5F5ECE1EB7C03A0BC006EB476B2D952_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_A5F5ECE1EB7C03A0BC006EB476B2D952" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">(Decrease) increase in taxes, including income taxes</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_A5F5ECE1EB7C03A0BC006EB476B2D952_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedTaxesPayable_A5F5ECE1EB7C03A0BC006EB476B2D952" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accrued Taxes Payable</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess_6D1DEE822699BC716FE56EB476B3E37C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess_6D1DEE822699BC716FE56EB476B3E37C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net change in short-term borrowings (original maturities of three months or less)</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B9F57E9702AC0BE9BE316EB476B3DC62_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B9F57E9702AC0BE9BE316EB476B3DC62" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additions to debt (original maturities greater than three months) (P)</link:label>
    <link:label id="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B9F57E9702AC0BE9BE316EB476B3DC62_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B9F57E9702AC0BE9BE316EB476B3DC62" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Issuance of Long-term Debt</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B9F57E9702AC0BE9BE316EB476B3DC62" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_B9F57E9702AC0BE9BE316EB476B3DC62" xlink:type="arc" />
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    <link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_AE7ECE71144F17FDD9E66EB476B3D483_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_AE7ECE71144F17FDD9E66EB476B3D483" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Repayments of Long-term Debt</link:label>
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    <link:label id="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_4EBE5DB31D6C262D76A76EB476B47168_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_4EBE5DB31D6C262D76A76EB476B47168" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Premiums paid on early redemption of debt (P)</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_4EBE5DB31D6C262D76A76EB476B47168_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtExtinguishmentCosts_4EBE5DB31D6C262D76A76EB476B47168" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payment for Debt Extinguishment or Debt Prepayment Cost</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_164CA66E020AB092CDC16EB476B4DDAA_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_164CA66E020AB092CDC16EB476B4DDAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from exercise of employee stock options</link:label>
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    <link:label id="lab_us-gaap_PaymentsOfOrdinaryDividends_28BA9EFD95AA25E33A3C6EB476B4BC6D_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfOrdinaryDividends_28BA9EFD95AA25E33A3C6EB476B4BC6D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Dividends paid to shareholders</link:label>
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    <link:label id="lab_us-gaap_PaymentsOfDistributionsToAffiliates_5FCCE28733D4E220138D6EB476B4013B_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDistributionsToAffiliates_5FCCE28733D4E220138D6EB476B4013B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Distributions to noncontrolling interests</link:label>
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    <link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_0CBC0040BFE00A8D67486EB476B56021_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_0CBC0040BFE00A8D67486EB476B56021" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Repurchase of common stock (H)</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_D114E13B9B0D4A08CF736EB476B505D9_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_D114E13B9B0D4A08CF736EB476B505D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_E0821F12D0E4CD294FF26EB476B58336_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_E0821F12D0E4CD294FF26EB476B58336" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Cash used for financing activities</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A5FA9B3FF6D67C952B2A6EB476B5AF9F_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_A5FA9B3FF6D67C952B2A6EB476B5AF9F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets_C9229327E6F0BBB0E7506EB476B5B58E_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets_C9229327E6F0BBB0E7506EB476B5B58E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from the sale of assets and businesses (S)</link:label>
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    <link:label id="lab_arnc_TransportationMember_2F9C481C3486432D52323F32B88D824C_terseLabel_en-US" xlink:label="lab_arnc_TransportationMember_2F9C481C3486432D52323F32B88D824C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transportation</link:label>
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    <link:label id="lab_arnc_BuildingAndConstructionMember_0D6C9604BDA2148C0EB93F32B88DC3DC_terseLabel_en-US" xlink:label="lab_arnc_BuildingAndConstructionMember_0D6C9604BDA2148C0EB93F32B88DC3DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Building and construction</link:label>
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    <link:label id="lab_arnc_BuildingAndConstructionMember_0D6C9604BDA2148C0EB93F32B88DC3DC_documentation_en-US" xlink:label="lab_arnc_BuildingAndConstructionMember_0D6C9604BDA2148C0EB93F32B88DC3DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Building And Construction [Member]</link:label>
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    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_A05E3A8DC74E14C9EB19600C37ADDEF1_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_A05E3A8DC74E14C9EB19600C37ADDEF1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock-based compensation expense capitalized</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B2DDAC37E44A8605ED91600C37ADA7EB_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_B2DDAC37E44A8605ED91600C37ADA7EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation arrangement by share-based payment award, options, grants in period, weighted average grant date fair value (in usd per share)</link:label>
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    <link:label id="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExerciseBehavior_9B9B5A914571BD9DB730600C37AEFE75_terseLabel_en-US" xlink:label="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExerciseBehavior_9B9B5A914571BD9DB730600C37AEFE75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise behavior, percentage</link:label>
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    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_4571F08AA658D919FA56600C37AE5212_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_4571F08AA658D919FA56600C37AE5212" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Life (years)</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_4571F08AA658D919FA56600C37AE5212_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_4571F08AA658D919FA56600C37AE5212" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_4571F08AA658D919FA56600C37AE5212" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_4571F08AA658D919FA56600C37AE5212" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of options, outstanding weighted average remaining contractual life</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_5814D038E69CA8D70C6F600C37AED31F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total intrinsic value of options outstanding</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_0E4F18CAF9B4ABEBB0A6600C37AF1728" xlink:type="arc" />
    <link:label id="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A_terseLabel_en-US" xlink:label="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock options vested (in shares)</link:label>
    <link:label id="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A_label_en-US" xlink:label="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Vested In Period</link:label>
    <link:label id="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A_documentation_en-US" xlink:label="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Vested In Period</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod" xlink:label="loc_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A" xlink:to="lab_arnc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod_F9440DA4DE47B221A0A5600C37AFCC4A" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average remaining contractual life, vested and exercisable</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_45FC5637949698DF3AD5600C37AF13C1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average exercise price, vested and exercisable (in usd per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_E86024B23A6DD4835E3D600C37AF6F6F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total intrinsic value of options vested and exercisable</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_3E503A76EFAA13F1C670600C37AF74A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_50B2424958CF5463B1D0600C37B08A4D_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_50B2424958CF5463B1D0600C37B08A4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total tax benefit realized from these exercises</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredTaxExpenseFromStockOptionsExercised" xlink:label="loc_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_50B2424958CF5463B1D0600C37B08A4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_50B2424958CF5463B1D0600C37B08A4D" xlink:to="lab_us-gaap_DeferredTaxExpenseFromStockOptionsExercised_50B2424958CF5463B1D0600C37B08A4D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_B1851EDDA5BC3B0E4DF4600C37B034B7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_B1851EDDA5BC3B0E4DF4600C37B034B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total intrinsic value of options exercised</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_B1851EDDA5BC3B0E4DF4600C37B034B7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_B1851EDDA5BC3B0E4DF4600C37B034B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_B1851EDDA5BC3B0E4DF4600C37B034B7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73_terseLabel_en-US" xlink:label="lab_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:label id="lab_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73_label_en-US" xlink:label="lab_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-Lived Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncurrentAssets" xlink:label="loc_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73" xlink:to="lab_us-gaap_NoncurrentAssets_6161BAE5F417D71C82856EB471E78A73" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_3F207E795002BC3C36106EB471E8123A_terseLabel_en-US" xlink:label="lab_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_3F207E795002BC3C36106EB471E8123A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Percentage of fair value in excess of carrying amount</link:label>
    <link:label id="lab_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_3F207E795002BC3C36106EB471E8123A_label_en-US" xlink:label="lab_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_3F207E795002BC3C36106EB471E8123A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_3F207E795002BC3C36106EB471E8123A" xlink:type="locator" />
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    <link:label id="lab_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B_terseLabel_en-US" xlink:label="lab_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Asset impairment charges</link:label>
    <link:label id="lab_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B_label_en-US" xlink:label="lab_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Tangible Asset Impairment Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TangibleAssetImpairmentCharges" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B" xlink:to="lab_us-gaap_TangibleAssetImpairmentCharges_8BBC34D8DA34D982743B6EB471E8D90B" xlink:type="arc" />
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of presentation</link:label>
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_E5A6FC10A2FA82ECF38F737B28BD186A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principles of consolidation</link:label>
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F" xlink:to="lab_us-gaap_ConsolidationPolicyTextBlock_9EB7D0606F52C0C1071E737B28BDD62F" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E" xlink:to="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_250F9A432518740D0DA4737B28BD732E" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventory valuation</link:label>
    <link:label id="lab_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2_label_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryPolicyTextBlock" xlink:label="loc_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2" xlink:to="lab_us-gaap_InventoryPolicyTextBlock_0DDA68566CBED5C6FB0B737B28BD74E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A09C767BE69A22133882737B28BD17CB_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A09C767BE69A22133882737B28BD17CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Properties, plants, and equipment</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A09C767BE69A22133882737B28BD17CB_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A09C767BE69A22133882737B28BD17CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_A09C767BE69A22133882737B28BD17CB" xlink:type="locator" />
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    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_C4BCACF8A6525A516E76737B28BDE477_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_C4BCACF8A6525A516E76737B28BDE477" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Goodwill and other intangible assets</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_C4BCACF8A6525A516E76737B28BDE477" xlink:type="locator" />
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    <link:label id="lab_arnc_EnvironmentalMattersPolicyTextBlock_CF01D58E6061DC1A6111737B28C1BD68_terseLabel_en-US" xlink:label="lab_arnc_EnvironmentalMattersPolicyTextBlock_CF01D58E6061DC1A6111737B28C1BD68" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Environmental matters</link:label>
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    <link:label id="lab_arnc_EnvironmentalMattersPolicyTextBlock_CF01D58E6061DC1A6111737B28C1BD68_documentation_en-US" xlink:label="lab_arnc_EnvironmentalMattersPolicyTextBlock_CF01D58E6061DC1A6111737B28C1BD68" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Environmental Matters Policy [Text Block]</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_EnvironmentalMattersPolicyTextBlock" xlink:label="loc_arnc_EnvironmentalMattersPolicyTextBlock_CF01D58E6061DC1A6111737B28C1BD68" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_C871FE2C1D595B1D822E73AD3BA90290_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock_C871FE2C1D595B1D822E73AD3BA90290" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Leases</link:label>
    <link:label id="lab_us-gaap_LesseeLeasesPolicyTextBlock_C871FE2C1D595B1D822E73AD3BA90290_label_en-US" xlink:label="lab_us-gaap_LesseeLeasesPolicyTextBlock_C871FE2C1D595B1D822E73AD3BA90290" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Lessee, Leases [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeLeasesPolicyTextBlock" xlink:label="loc_us-gaap_LesseeLeasesPolicyTextBlock_C871FE2C1D595B1D822E73AD3BA90290" xlink:type="locator" />
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    <link:label id="lab_arnc_LitigationMattersPolicyTextBlock_E8B62D76AE28C2A85580737B28C1AAF6_terseLabel_en-US" xlink:label="lab_arnc_LitigationMattersPolicyTextBlock_E8B62D76AE28C2A85580737B28C1AAF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Litigation matters</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxDisclosureTextBlock_470616AA52BD57F2A7B7028A9BC3320C" xlink:to="lab_us-gaap_IncomeTaxDisclosureTextBlock_470616AA52BD57F2A7B7028A9BC3320C" xlink:type="arc" />
    <link:label id="lab_us-gaap_BusinessCombinationContingentConsiderationLiability_50D3C542B36597F89B08907DCC1FB88A_verboseLabel_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationLiability_7B1439F82AE85880B9A0DE1DDC34FCD7" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Contingent consideration liability</link:label>
    <link:label id="lab_us-gaap_BusinessCombinationContingentConsiderationLiability_50D3C542B36597F89B08907DCC1FB88A_label_en-US" xlink:label="lab_us-gaap_BusinessCombinationContingentConsiderationLiability_7B1439F82AE85880B9A0DE1DDC34FCD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Business Combination, Contingent Consideration, Liability</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_7B1439F82AE85880B9A0DE1DDC34FCD7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_7B1439F82AE85880B9A0DE1DDC34FCD7" xlink:to="lab_us-gaap_BusinessCombinationContingentConsiderationLiability_7B1439F82AE85880B9A0DE1DDC34FCD7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanBenefitObligation_84D33FE2AE643583FC7C907DCBDFE9F2_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanBenefitObligation_5EA46E37C70159868F0D60E3437366B9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Projected benefit obligation</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanBenefitObligation_84D33FE2AE643583FC7C907DCBDFE9F2_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanBenefitObligation_5EA46E37C70159868F0D60E3437366B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_5EA46E37C70159868F0D60E3437366B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanBenefitObligation_5EA46E37C70159868F0D60E3437366B9" xlink:to="lab_us-gaap_DefinedBenefitPlanBenefitObligation_5EA46E37C70159868F0D60E3437366B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_2CC61F205465A32215AD907DCBDF8998_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_CB9CA68076505BAE919FDBCDA3B2E9CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated benefit obligation</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_2CC61F205465A32215AD907DCBDF8998_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_CB9CA68076505BAE919FDBCDA3B2E9CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Accumulated Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_CB9CA68076505BAE919FDBCDA3B2E9CD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_CB9CA68076505BAE919FDBCDA3B2E9CD" xlink:to="lab_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_CB9CA68076505BAE919FDBCDA3B2E9CD" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_172B490C673C77E82790907DCBDF3875_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_877C4CAB917C5C2DA14FB89BA59E76E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">The aggregate projected benefit obligation and fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets was as follows:</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_172B490C673C77E82790907DCBDF3875_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_877C4CAB917C5C2DA14FB89BA59E76E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_877C4CAB917C5C2DA14FB89BA59E76E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_877C4CAB917C5C2DA14FB89BA59E76E2" xlink:to="lab_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAbstract_877C4CAB917C5C2DA14FB89BA59E76E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_369C9A6EDACBBD15F405907DCBDF8A3D_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_3869831CE1965F4F839515047FA101C3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Projected benefit obligation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation_3869831CE1965F4F839515047FA101C3" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_339123568654F7CA2D50907DCBDF529C_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_1A1447C9BB6D5D5BB4A4EC1A5735E74F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of plan assets</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_339123568654F7CA2D50907DCBDF529C_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_1A1447C9BB6D5D5BB4A4EC1A5735E74F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_1A1447C9BB6D5D5BB4A4EC1A5735E74F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_1A1447C9BB6D5D5BB4A4EC1A5735E74F" xlink:to="lab_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_1A1447C9BB6D5D5BB4A4EC1A5735E74F" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_30F530E3196AB15BA56F907DCBDF7F89_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_036C509B239F558DBFC03B0D88BBDB89" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">The aggregate accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets was as follows:</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_30F530E3196AB15BA56F907DCBDF7F89_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_036C509B239F558DBFC03B0D88BBDB89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_036C509B239F558DBFC03B0D88BBDB89" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_036C509B239F558DBFC03B0D88BBDB89" xlink:to="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract_036C509B239F558DBFC03B0D88BBDB89" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_5BFE34D78CB5DDB0CDC3907DCBDF4764_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_AEE7611678FE597E92A28563C48B7EF9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated benefit obligation</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_AEE7611678FE597E92A28563C48B7EF9" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_E4C4B1D9D89D2A159BAD907DCBDFFA71_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_C1F116372A9957AC8F001D9CFF184DDB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of plan assets</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_E4C4B1D9D89D2A159BAD907DCBDFFA71_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_C1F116372A9957AC8F001D9CFF184DDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_C1F116372A9957AC8F001D9CFF184DDB" xlink:to="lab_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_C1F116372A9957AC8F001D9CFF184DDB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FB39BC0B2A60F4A1A985F28BBFD47A5F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_FB39BC0B2A60F4A1A985F28BBFD47A5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Revenues from External Customers and Long-Lived Assets [Table]</link:label>
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    <link:label id="lab_country_FR_3B9607C4576B23BE8AD7F28BBFD5CA6A_terseLabel_en-US" xlink:label="lab_country_FR_3B9607C4576B23BE8AD7F28BBFD5CA6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">France</link:label>
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    <link:label id="lab_country_GB_7B55D9CB9201C58007FFF28BBFD544F6_terseLabel_en-US" xlink:label="lab_country_GB_7B55D9CB9201C58007FFF28BBFD544F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">United Kingdom</link:label>
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    <link:label id="lab_us-gaap_InterestExpense_2316D652458A3D035466F1CA40A15026_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_2316D652458A3D035466F1CA40A15026" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest expense (D)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_2316D652458A3D035466F1CA40A15026" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpense_2316D652458A3D035466F1CA40A15026" xlink:to="lab_us-gaap_InterestExpense_2316D652458A3D035466F1CA40A15026" xlink:type="arc" />
    <link:label id="lab_us-gaap_NonoperatingIncomeExpense_55907CA66ECE13D34CFBF1CA40A1EDD1_negatedLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpense_55907CA66ECE13D34CFBF1CA40A1EDD1" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Other expense (income), net (E)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_55907CA66ECE13D34CFBF1CA40A1EDD1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_55907CA66ECE13D34CFBF1CA40A1EDD1" xlink:to="lab_us-gaap_NonoperatingIncomeExpense_55907CA66ECE13D34CFBF1CA40A1EDD1" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_67ED21DA712981987E57F1CA40A15C65_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_67ED21DA712981987E57F1CA40A15C65" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Provision for income taxes (G)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_67ED21DA712981987E57F1CA40A15C65" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_67ED21DA712981987E57F1CA40A15C65" xlink:to="lab_us-gaap_IncomeTaxExpenseBenefit_67ED21DA712981987E57F1CA40A15C65" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLoss_E3AFA6BBC3A2CCD96F42F1CA40A15E3F_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_E3AFA6BBC3A2CCD96F42F1CA40A15E3F" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_E3AFA6BBC3A2CCD96F42F1CA40A15E3F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss_E3AFA6BBC3A2CCD96F42F1CA40A15E3F" xlink:to="lab_us-gaap_NetIncomeLoss_E3AFA6BBC3A2CCD96F42F1CA40A15E3F" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amounts Attributable to Arconic Common Shareholders (I):</link:label>
    <link:label id="lab_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54_label_en-US" xlink:label="lab_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Amounts Attributable to Parent, Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract" xlink:label="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54" xlink:to="lab_us-gaap_IncomeAmountsAttributableToReportingEntityDisclosuresAbstract_84B27E8EA8257ECB713EF1CA40A2DE54" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net income (loss)</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_B1A3D42772EAC482C633F1CA40A29312" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasic_A35DB7EC3B8BA0739A4BF1CA40A24B4D_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasic_A35DB7EC3B8BA0739A4BF1CA40A24B4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) per share - basic (in usd per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_A35DB7EC3B8BA0739A4BF1CA40A24B4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasic_A35DB7EC3B8BA0739A4BF1CA40A24B4D" xlink:to="lab_us-gaap_EarningsPerShareBasic_A35DB7EC3B8BA0739A4BF1CA40A24B4D" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareDiluted_1F7123616BD49B1D58E0F1CA40A39E7E_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDiluted_1F7123616BD49B1D58E0F1CA40A39E7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Earnings (loss) per share - diluted (in usd per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_1F7123616BD49B1D58E0F1CA40A39E7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDiluted_1F7123616BD49B1D58E0F1CA40A39E7E" xlink:to="lab_us-gaap_EarningsPerShareDiluted_1F7123616BD49B1D58E0F1CA40A39E7E" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareDilutedAbstract_437DC5B607E258328B95F1CA40A32A9B_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareDilutedAbstract_437DC5B607E258328B95F1CA40A32A9B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Average Shares Outstanding (I):</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_437DC5B607E258328B95F1CA40A32A9B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_437DC5B607E258328B95F1CA40A32A9B" xlink:to="lab_us-gaap_EarningsPerShareDilutedAbstract_437DC5B607E258328B95F1CA40A32A9B" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Average shares outstanding - basic (in shares)</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_C6C9BA0599888DC30F05F1CA40A3B435" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Average shares outstanding - diluted (in shares)</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B" xlink:to="lab_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4DCAB23436BE432B2FCFF1CA40A3887B" xlink:type="arc" />
    <link:label id="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A_verboseLabel_en-US" xlink:label="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">1.63% Convertible Notes, due 2019</link:label>
    <link:label id="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A_label_en-US" xlink:label="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">One Point Six Three Percent Convertible Notes Due Two Thousand Nineteen [Member]</link:label>
    <link:label id="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A_documentation_en-US" xlink:label="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">One Point Six Three Percent Convertible Notes Due Two Thousand Nineteen [Member]</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember" xlink:label="loc_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A" xlink:to="lab_arnc_OnePointSixThreePercentConvertibleNotesDueTwoThousandNineteenMember_3FE93EF9DD2E987BE5FEF28BBD0BE03A" xlink:type="arc" />
    <link:label id="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6_verboseLabel_en-US" xlink:label="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">6.150% Notes, due 2020</link:label>
    <link:label id="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6_label_en-US" xlink:label="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Point One Five Percent Notes Due Two Thousand Twenty [Member]</link:label>
    <link:label id="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6_documentation_en-US" xlink:label="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six point one five percent notes due two thousand twenty.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember" xlink:label="loc_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6" xlink:to="lab_arnc_SixPointOneFivePercentNotesDueTwoThousandTwentyMember_38B7B98A3C563DE9C645F28BBD0C12D6" xlink:type="arc" />
    <link:label id="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26_verboseLabel_en-US" xlink:label="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">5.40% Notes, due 2021</link:label>
    <link:label id="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26_label_en-US" xlink:label="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point Four Zero Percent Notes Due Two Thousand Twenty One [Member]</link:label>
    <link:label id="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26_documentation_en-US" xlink:label="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five point four zero percent notes due two thousand twenty one.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember" xlink:label="loc_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26" xlink:to="lab_arnc_FivePointFourZeroPercentNotesDueTwoThousandTwentyOneMember_A522396BEA7B751D3C5AF28BBD0C7B26" xlink:type="arc" />
    <link:label id="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320_verboseLabel_en-US" xlink:label="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">5.87% Notes, due 2022</link:label>
    <link:label id="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320_label_en-US" xlink:label="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point Eight Seven Percent Notes Due Two Thousand Twenty Two [Member]</link:label>
    <link:label id="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320_documentation_en-US" xlink:label="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five point eight seven percent notes due two thousand twenty two.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember" xlink:label="loc_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320" xlink:to="lab_arnc_FivePointEightSevenPercentNotesDueTwoThousandTwentyTwoMember_EE8DA9C0AA1E8016F3E2F28BBD0C9320" xlink:type="arc" />
    <link:label id="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF_verboseLabel_en-US" xlink:label="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">5.125% Notes, due 2024</link:label>
    <link:label id="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF_label_en-US" xlink:label="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point One Two Five Percent Notes Due Two Thousand Twenty Four [Member]</link:label>
    <link:label id="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF_documentation_en-US" xlink:label="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five Point One Two Five Percent Notes Due Two Thousand Twenty Four [Member]</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember" xlink:label="loc_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF" xlink:to="lab_arnc_FivePointOneTwoFivePercentNotesDueTwoThousandTwentyFourMember_7B3588D4D73AECBEEB1FF28BBD0C06DF" xlink:type="arc" />
    <link:label id="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A_verboseLabel_en-US" xlink:label="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">5.90% Notes, due 2027</link:label>
    <link:label id="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A_label_en-US" xlink:label="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point Nine Percent Notes Due Two Thousand Twenty Seven [Member]</link:label>
    <link:label id="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A_documentation_en-US" xlink:label="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five point nine percent notes due two thousand twenty seven.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember" xlink:label="loc_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A" xlink:to="lab_arnc_FivePointNinePercentNotesDueTwoThousandTwentySevenMember_DBD95EAD1A1738066796F28BBD0CC18A" xlink:type="arc" />
    <link:label id="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF_verboseLabel_en-US" xlink:label="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">6.75% Bonds, due 2028</link:label>
    <link:label id="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF_label_en-US" xlink:label="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Point Seven Five Percent Bonds Due Two Thousand Twenty Eight [Member]</link:label>
    <link:label id="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF_documentation_en-US" xlink:label="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six point seven five percent bonds due two thousand twenty eight.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember" xlink:label="loc_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF" xlink:to="lab_arnc_SixPointSevenFivePercentBondsDueTwoThousandTwentyEightMember_A6EA2FF72C6F439B1536F28BBD0C2EFF" xlink:type="arc" />
    <link:label id="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B_verboseLabel_en-US" xlink:label="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">5.95% Notes due 2037</link:label>
    <link:label id="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B_label_en-US" xlink:label="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point Nine Five Percent Notes Due Two Thousand Thirty Seven [Member]</link:label>
    <link:label id="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B_documentation_en-US" xlink:label="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five point nine five percent notes due two thousand thirty seven.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember" xlink:label="loc_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B" xlink:to="lab_arnc_FivePointNineFivePercentNotesDueTwoThousandThirtySevenMember_3CF3EFD446D368DD5DCCF28BBD0D1E1B" xlink:type="arc" />
    <link:label id="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0_verboseLabel_en-US" xlink:label="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Iowa Finance Authority Loan, due 2042 (4.75%)</link:label>
    <link:label id="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0_label_en-US" xlink:label="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Iowa Authority Loan [Member]</link:label>
    <link:label id="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0_documentation_en-US" xlink:label="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Iowa Authority Loan [Member]</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_IowaAuthorityLoanMember" xlink:label="loc_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0" xlink:to="lab_arnc_IowaAuthorityLoanMember_D7C5561B6096A944ED85F28BBD0D3FE0" xlink:type="arc" />
    <link:label id="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830_terseLabel_en-US" xlink:label="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">5.72% Notes due 2019</link:label>
    <link:label id="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830_label_en-US" xlink:label="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Five Point Seven Two Percent Notes Due Two Thousand Nineteen [Member]</link:label>
    <link:label id="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830_documentation_en-US" xlink:label="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Five point seven two percent notes due two thousand nineteen.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember" xlink:label="loc_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830" xlink:to="lab_arnc_FivePointSevenTwoPercentNotesDueTwoThousandNineteenMember_1803B836531EA0CD64BCF2AEAFEEA830" xlink:type="arc" />
    <link:label id="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21_terseLabel_en-US" xlink:label="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.5% Bonds due 2018</link:label>
    <link:label id="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21_label_en-US" xlink:label="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Point Five Percent Bonds Due Two Thousand Eighteen [Member]</link:label>
    <link:label id="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21_documentation_en-US" xlink:label="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six point five percent bonds due two thousand eighteen.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember" xlink:label="loc_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21" xlink:to="lab_arnc_SixPointFivePercentBondsDueTwoThousandEighteenMember_9003B6024EFC0CFF39FBF2AEB0B43C21" xlink:type="arc" />
    <link:label id="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F_terseLabel_en-US" xlink:label="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">6.75% Notes due 2018</link:label>
    <link:label id="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F_label_en-US" xlink:label="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Six Point Seven Five Percent Notes Due Two Thousand Eighteen [Member]</link:label>
    <link:label id="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F_documentation_en-US" xlink:label="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Six point seven five percent notes due two thousand eighteen.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember" xlink:label="loc_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F" xlink:to="lab_arnc_SixPointSevenFivePercentNotesDueTwoThousandEighteenMember_1520FF88244353F440EDF2AEB11A704F" xlink:type="arc" />
    <link:label id="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28_terseLabel_en-US" xlink:label="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Banks</link:label>
    <link:label id="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28_label_en-US" xlink:label="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Banks [Member]</link:label>
    <link:label id="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28_documentation_en-US" xlink:label="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Investment banks.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_InvestmentBanksMember" xlink:label="loc_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28" xlink:to="lab_arnc_InvestmentBanksMember_7D2B96444896FFAB7BE1F28BBD0EEC28" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest Rate Swap</link:label>
    <link:label id="lab_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587_label_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Rate Swap [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587" xlink:to="lab_us-gaap_InterestRateSwapMember_78C5C4D0B6405CF292E0F28BBD0F8587" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Convertible notes, interest rate percentage</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_3832CD6262BF6C22292AF28BBD10E88C" xlink:type="arc" />
    <link:label id="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD_terseLabel_en-US" xlink:label="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt instrument redemption amount</link:label>
    <link:label id="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD_label_en-US" xlink:label="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Redemption Amount</link:label>
    <link:label id="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD_documentation_en-US" xlink:label="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt instrument redemption amount.</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_DebtInstrumentRedemptionAmount" xlink:label="loc_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD" xlink:to="lab_arnc_DebtInstrumentRedemptionAmount_D9ED6D39A374087BFD44F28BBD10DEFD" xlink:type="arc" />
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    <link:loc xlink:href="arnc-20191231.xsd#arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate" xlink:label="loc_arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCostDiscountRate_A91B3604DCEBFD8A283D600C3896A7D5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_137B9C12EAAFE6AE89CF600C38968B55_verboseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_137B9C12EAAFE6AE89CF600C38968B55" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Expected long-term rate of return on plan assets</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_137B9C12EAAFE6AE89CF600C38968B55_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_137B9C12EAAFE6AE89CF600C38968B55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets</link:label>
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    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_FC3BF7FE2BB1B8A8E4B3600C3896A386_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_FC3BF7FE2BB1B8A8E4B3600C3896A386" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Rate of compensation increase</link:label>
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    <link:label id="lab_arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate_C25E87286148171071FB600C3897E77E_terseLabel_en-US" xlink:label="lab_arnc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostCashBalancePlanInterestCreditingRate_C25E87286148171071FB600C3897E77E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash balance plan interest crediting rate</link:label>
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    <link:label id="lab_arnc_AveragePeriodOfHistoricalReturnsUsedToCalculateExpectedFutureReturns_67A7E9D5D13D276336F2600C3897FC45_terseLabel_en-US" xlink:label="lab_arnc_AveragePeriodOfHistoricalReturnsUsedToCalculateExpectedFutureReturns_67A7E9D5D13D276336F2600C3897FC45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Period expected long-term rate of return is applied</link:label>
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    <link:loc xlink:href="arnc-20191231.xsd#arnc_DeferredPriceCustomerReceivables" xlink:label="loc_arnc_DeferredPriceCustomerReceivables_945572925748CEF939B63FD1DAEFF600" xlink:type="locator" />
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    <link:label id="lab_arnc_NetCashFundingReceivedForDevelopmentOfReservesDuringThePeriod_F3B4E8A2E0BF5C206C413FD1DAEFD26E_terseLabel_en-US" xlink:label="lab_arnc_NetCashFundingReceivedForDevelopmentOfReservesDuringThePeriod_F3B4E8A2E0BF5C206C413FD1DAEFD26E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net cash funding received during the period</link:label>
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    <link:label id="lab_arnc_RepaymentsForReceivableFundingDuringThePeriod_53D5B380F7F1C6ED89963FD1DAEF963B_negatedTerseLabel_en-US" xlink:label="lab_arnc_RepaymentsForReceivableFundingDuringThePeriod_53D5B380F7F1C6ED89963FD1DAEF963B" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Amount of cash repayments under arrangement during the period</link:label>
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    <link:label id="lab_arnc_GrossAmountofReceivablesSoldSinceInception_0C520784EF1754FC27DA3FD1DAF0E701_terseLabel_en-US" xlink:label="lab_arnc_GrossAmountofReceivablesSoldSinceInception_0C520784EF1754FC27DA3FD1DAF0E701" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross amount of receivables sold under the deferred purchase program</link:label>
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    <link:label id="lab_arnc_NoOfYearOverActualAnnualHealthcareCostTrendExperience_5D9961A64A235B2E8EA2F2EC01091A6E_verboseLabel_en-US" xlink:label="lab_arnc_NoOfYearOverActualAnnualHealthcareCostTrendExperience_5D9961A64A235B2E8EA2F2EC01091A6E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Number of years over actual annual healthcare cost trend experience</link:label>
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    <link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_6176915AB3F481A528CBAB7ED41C6E12_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_6176915AB3F481A528CBAB7ED41C6E12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Right-of-use assets classified in Other noncurrent assets</link:label>
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    <link:label id="lab_us-gaap_InvestmentTypeAxis_523FD8285473B503CD23600C3567A3DC_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeAxis_523FD8285473B503CD23600C3567A3DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Type [Axis]</link:label>
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    <link:label id="lab_us-gaap_BankLoanObligationsMember_E8DD55DAD404E3EF86EA600C3567D0BF_terseLabel_en-US" xlink:label="lab_us-gaap_BankLoanObligationsMember_E8DD55DAD404E3EF86EA600C3567D0BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Bank Loan Obligations</link:label>
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    <link:label id="lab_arnc_AlcoaCorporationWorkersCompensationClaimsMember_50B14F954FEEA382B018600C356AE8A9_terseLabel_en-US" xlink:label="lab_arnc_AlcoaCorporationWorkersCompensationClaimsMember_50B14F954FEEA382B018600C356AE8A9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Alcoa Corporation Workers Compensation Claims</link:label>
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    <link:label id="lab_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_1FFD2FA69A5B9441574D600C356B337C_terseLabel_en-US" xlink:label="lab_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_1FFD2FA69A5B9441574D600C356B337C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase obligations due in 2020</link:label>
    <link:label id="lab_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_1FFD2FA69A5B9441574D600C356B337C_label_en-US" xlink:label="lab_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_1FFD2FA69A5B9441574D600C356B337C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Recorded Unconditional Purchase Obligation Due in Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear_1FFD2FA69A5B9441574D600C356B337C" xlink:type="locator" />
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    <link:label id="lab_arnc_SeparationTransactionNumberOfIndependentPubliclyTradedCompaniesFormed_16C2FDCD0B0856F30FEE62FF86B2566C_terseLabel_en-US" xlink:label="lab_arnc_SeparationTransactionNumberOfIndependentPubliclyTradedCompaniesFormed_16C2FDCD0B0856F30FEE62FF86B2566C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of independent, publicly-traded companies resulting from proposed separation transaction</link:label>
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    <link:label id="lab_arnc_OtherMember_670DD6C71AEF9884E1479F359EB13EFF_label_en-US" xlink:label="lab_arnc_OtherMember_670DD6C71AEF9884E1479F359EB13EFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
    <link:label id="lab_arnc_OtherMember_670DD6C71AEF9884E1479F359EB13EFF_documentation_en-US" xlink:label="lab_arnc_OtherMember_670DD6C71AEF9884E1479F359EB13EFF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other [Member]</link:label>
    <link:loc xlink:href="arnc-20191231.xsd#arnc_OtherMember" xlink:label="loc_arnc_OtherMember_670DD6C71AEF9884E1479F359EB13EFF" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebt_7A432B7A714467716A539EAC4B87ADC5_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_7A432B7A714467716A539EAC4B87ADC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_7A432B7A714467716A539EAC4B87ADC5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtCurrent_06EBCACD8642C697345D9F3E3C190C33_label_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrent_06EBCACD8642C697345D9F3E3C190C33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Current Maturities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_06EBCACD8642C697345D9F3E3C190C33" xlink:type="locator" />
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    <link:label id="lab_us-gaap_LongTermDebtNoncurrent_9336ADE314B601D4130A9F3E3EC3966F_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_9336ADE314B601D4130A9F3E3EC3966F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Excluding Current Maturities</link:label>
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