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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001232579</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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      <issuerInfo>
        <issuerCik>0001598428</issuerCik>
        <issuerName>Metallus Inc.</issuerName>
        <secFileNumber>001-36313</secFileNumber>
        <issuerAddress>
          <com:street1>1835 DUEBER AVENUE SW</com:street1>
          <com:city>CANTON</com:city>
          <com:stateOrCountry>OH</com:stateOrCountry>
          <com:zipCode>44706-0928</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>330-471-7000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SYRVALIN KRISTINE C</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch</name>
          <address>
            <com:street1>3455 Peachtree Road NW</com:street1>
            <com:street2>Suite 1000</com:street2>
            <com:city>Atlanta</com:city>
            <com:stateOrCountry>GA</com:stateOrCountry>
            <com:zipCode>30326</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>7500</noOfUnitsSold>
        <aggregateMarketValue>135000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>42023268</noOfUnitsOutstanding>
        <approxSaleDate>07/23/2025</approxSaleDate>
        <securitiesExchangeName>New York</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>RESTRICTED STOCK UNIT VEST</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>METALLUS INC.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4741</amountOfSecuritiesAcquired>
        <paymentDate>03/01/2024</paymentDate>
        <natureOfPayment>Compensatory Payment</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>COMMON</securitiesClassTitle>
        <acquiredDate>03/02/2023</acquiredDate>
        <natureOfAcquisitionTransaction>PERFORMANCE STOCK UNIT VEST</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>METALLUS INC.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>910</amountOfSecuritiesAcquired>
        <paymentDate>03/02/2023</paymentDate>
        <natureOfPayment>Compensatory Payment</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>COMMON</securitiesClassTitle>
        <acquiredDate>03/02/2023</acquiredDate>
        <natureOfAcquisitionTransaction>PERFORMANCE STOCK UNIT VEST</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>METALLUS INC.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1849</amountOfSecuritiesAcquired>
        <paymentDate>03/02/2023</paymentDate>
        <natureOfPayment>Compensatory Payment</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>KRISTINE SYRVALIN</name>
          <address>
            <com:street1>1835 DUEBER AVENUE SW</com:street1>
            <com:city>CANTON</com:city>
            <com:stateOrCountry>OH</com:stateOrCountry>
            <com:zipCode>44706</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>COMMON</securitiesClassTitle>
        <saleDate>07/02/2025</saleDate>
        <amountOfSecuritiesSold>7500</amountOfSecuritiesSold>
        <grossProceeds>120000.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>07/23/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>11/14/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>Kristine C Syrvalin</signature>
      </noticeSignature>
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text: 144
  0001232579
  XXXXXXXX
  LIVE
  0001598428
  Metallus Inc.
  001-36313
  1835 DUEBER AVENUE SW
  CANTON
  OH
  44706-0928
  330-471-7000
  SYRVALIN KRISTINE C
  Officer
  Common
  Merrill Lynch
  3455 Peachtree Road NW
  Suite 1000
  Atlanta
  GA
  30326
  7500
  135000.00
  42023268
  07/23/2025
  New York
  Common
  03/01/2024
  RESTRICTED STOCK UNIT VEST
  METALLUS INC.
  N
  4741
  03/01/2024
  Compensatory Payment
  COMMON
  03/02/2023
  PERFORMANCE STOCK UNIT VEST
  METALLUS INC.
  N
  910
  03/02/2023
  Compensatory Payment
  COMMON
  03/02/2023
  PERFORMANCE STOCK UNIT VEST
  METALLUS INC.
  N
  1849
  03/02/2023
  Compensatory Payment
  N
  KRISTINE SYRVALIN
  1835 DUEBER AVENUE SW
  CANTON
  OH
  44706
  COMMON
  07/02/2025
  7500
  120000.00
  07/23/2025
  11/14/2024
  Kristine C Syrvalin