    <SEC-DOCUMENT>0001193125-24-065039-index.html : 20240312
    <SEC-HEADER>0001193125-24-065039.hdr.sgml : 20240312
    <ACCEPTANCE-DATETIME>20240311181058
    ACCESSION NUMBER:		0001193125-24-065039
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240312
    DATE AS OF CHANGE:		20240311
    EFFECTIVENESS DATE:		20240312

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Metallus Inc.
    		CENTRAL INDEX KEY:			0001598428
    		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
    		ORGANIZATION NAME:           	04 Manufacturing
    		IRS NUMBER:				464024951
    		STATE OF INCORPORATION:			OH
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-36313
    		FILM NUMBER:		24739517

    	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

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	TimkenSteel Corp
    		DATE OF NAME CHANGE:	20140128
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>d560747dars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: d560747dars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>