<SEC-DOCUMENT>0000899243-18-004070.txt : 20180214
<SEC-HEADER>0000899243-18-004070.hdr.sgml : 20180214
<ACCEPTANCE-DATETIME>20180214214826
ACCESSION NUMBER:		0000899243-18-004070
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20180212
FILED AS OF DATE:		20180214
DATE AS OF CHANGE:		20180214

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Moss Tod
		CENTRAL INDEX KEY:			0001671172

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35479
		FILM NUMBER:		18615976

	MAIL ADDRESS:	
		STREET 1:		FULBRIGHT TOWER
		STREET 2:		1301 MCKINNEY ST., SUITE 2300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77010

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MRC GLOBAL INC.
		CENTRAL INDEX KEY:			0001439095
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-INDUSTRIAL MACHINERY & EQUIPMENT [5084]
		IRS NUMBER:				205956993
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		FULBRIGHT TOWER
		STREET 2:		1301 MCKINNEY STREET, SUITE 2300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77010
		BUSINESS PHONE:		877.294.7574

	MAIL ADDRESS:	
		STREET 1:		FULBRIGHT TOWER
		STREET 2:		1301 MCKINNEY STREET, SUITE 2300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77010

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MCJUNKIN RED MAN HOLDING CORP
		DATE OF NAME CHANGE:	20080702
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-02-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001439095</issuerCik>
        <issuerName>MRC GLOBAL INC.</issuerName>
        <issuerTradingSymbol>MRC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001671172</rptOwnerCik>
            <rptOwnerName>Moss Tod</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>FULBRIGHT TOWER, 1301</rptOwnerStreet1>
            <rptOwnerStreet2>MCKINNEY ST., SUITE 2300</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77010</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>SVP Operations West US/Canada</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-02-12</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>9045</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>73120</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-02-13</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1328</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>16.35</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>71792</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On February 12, 2018, the reporting person received 9,045 Restricted Stock Units (the &quot;February 2018 Annual Grant&quot;). Each Restricted Stock Unit represents a contingent right to receive one share of issuer's Common Stock. 34% of the February 2018 Annual Grant will vest on 2/12/2019 and 33% of the February 2018 Annual Grant will vest on each of 2/12/20 and 2/12/21, each conditioned on the reporting person's continued service with the issuer and subject to accelerated vesting under certain circumstances.</footnote>
        <footnote id="F2">The reporting person surrendered these shares to satisfy tax withholding obligations resulting from the vesting of certain Restricted Stock Units of the issuer's Common Stock.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Ann D. Garnett, by power of attorney</signatureName>
        <signatureDate>2018-02-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>attachment1.htm
<DESCRIPTION>EX-24 DOCUMENT
<TEXT>
<HTML>
<HEAD>
</HEAD>
<BODY>
<PRE>
                           LIMITED POWER OF ATTORNEY

        The undersigned, being an executive officer of MRC Global Inc. (the
"Corporation"), who will hereby be subject to the reporting obligations of
Section 16 of the Securities Exchange Act of 1934, as amended (the "Act"), with
respect to securities of the Corporation, hereby constitutes and appoints, with
full power of substitution or revocation, each of Daniel J. Churay and Ann D.
Garnett, or such attorneys'-in-fact substitute or substitutes, as the
undersigned's true and lawful attorneys-in-fact and agents to execute and file
for and on behalf of the undersigned Forms 3, 4 and 5 with the Securities and
Exchange Commission (the "SEC"), and to perform all acts necessary in order to
execute and file such Forms 3, 4 and 5, as he or she, as applicable, shall deem
appropriate.  The undersigned hereby ratifies and confirms all that said
attorneys-in- fact and agents, or such attorneys'-in-fact substitute or
substitutes, shall do or cause to be done by virtue hereof.

        The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, or such attorneys'-
in-fact substitute or substitutes, are not assuming, nor is the Corporation
assuming, any of the undersigned's responsibilities to comply with Section 16 of
the Act.  This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4 and 5 with
respect to the undersigned's holdings of and transactions in securities issued
by the Corporation, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.

        This Limited Power of Attorney is effective as of April 1, 2016, and any
previous power of attorney issued by the undersigned for the purpose of
executing and filing Forms 3, 4 and 5 with the SEC with respect to holdings of
and transactions in securities issued by the Corporation is hereby revoked
(without affecting the effectiveness of any such power of attorney prior to the
date hereof).


                                        /s/ Tod Moss
                                        ------------------------------
                                        Tod Moss

</PRE>
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</DOCUMENT>
</SEC-DOCUMENT>
