<SEC-DOCUMENT>0001598428-19-000094.txt : 20190813
<SEC-HEADER>0001598428-19-000094.hdr.sgml : 20190813
<ACCEPTANCE-DATETIME>20190813114931
ACCESSION NUMBER:		0001598428-19-000094
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190808
FILED AS OF DATE:		20190813
DATE AS OF CHANGE:		20190813

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Yacobozzi Nicholas A
		CENTRAL INDEX KEY:			0001785107

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36313
		FILM NUMBER:		191019109

	MAIL ADDRESS:	
		STREET 1:		1835 DUEBER AVE SW
		STREET 2:		GNE-15
		CITY:			CANTON
		STATE:			OH
		ZIP:			44706

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			TimkenSteel Corp
		CENTRAL INDEX KEY:			0001598428
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
		IRS NUMBER:				464024951
		STATE OF INCORPORATION:			OH
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1835 DUEBER AVENUE SW
		CITY:			CANTON
		STATE:			OH
		ZIP:			44706-0928
		BUSINESS PHONE:		330-471-7000

	MAIL ADDRESS:	
		STREET 1:		1835 DUEBER AVENUE SW
		CITY:			CANTON
		STATE:			OH
		ZIP:			44706-0928
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_156571135562528.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-08-08</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001598428</issuerCik>
        <issuerName>TimkenSteel Corp</issuerName>
        <issuerTradingSymbol>TMST</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001785107</rptOwnerCik>
            <rptOwnerName>Yacobozzi Nicholas A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1835 DUEBER AVE. SW</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CANTON</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>44706</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Corporate Controller</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3880</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Nonqualified Stock Option (Right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>12.45</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2029-03-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5840.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Vests in four equal annual installments beginning March 1, 2020.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Frank A. DiPiero, as Attorney-in-Fact</signatureName>
        <signatureDate>2019-08-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
