<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-12-01</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001968487</issuerCik>
        <issuerName>Worthington Steel, Inc.</issuerName>
        <issuerTradingSymbol>WS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000108516</rptOwnerCik>
            <rptOwnerName>WORTHINGTON ENTERPRISES, INC.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 W. OLD WILSON BRIDGE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>COLUMBUS</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>43085</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2023-12-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50025115</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">In connection with the separation of the Issuer from the Reporting Person (the &quot;Spin-Off&quot;), the Reporting Person effected a pro rata distribution to its shareholders of record as of November 21, 2023 of 50,025,115 of the Issuer's common shares.</footnote>
        <footnote id="F2">Reflects a stock split of the Issuer's common shares effected prior to the Spin-Off.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/Patrick J. Kennedy, Vice President-Secretary</signatureName>
        <signatureDate>2023-12-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0508
4
2023-12-01
0
0001968487
Worthington Steel, Inc.
WS
0000108516
WORTHINGTON ENTERPRISES, INC.
200 W. OLD WILSON BRIDGE ROAD
COLUMBUS
OH
43085
0
0
1
0
0
Common Shares
2023-12-01
4
J
0
50025115
0
D
0
D
In connection with the separation of the Issuer from the Reporting Person (the "Spin-Off"), the Reporting Person effected a pro rata distribution to its shareholders of record as of November 21, 2023 of 50,025,115 of the Issuer's common shares.
Reflects a stock split of the Issuer's common shares effected prior to the Spin-Off.
/s/Patrick J. Kennedy, Vice President-Secretary
2023-12-05