Range attributes C (Carbon) 1.15 to 1.24 % Cr (Chromium) 0.2 % (maximum) Cu (Copper) 0.25 % (maximum) Fe (Iron) 97.3 to 98.6 % (estimate) Mn (Manganese) 0.15 to 0.35 % Ni (Nickel) 0.25 % (maximum) P (Phosphorus) 0.025 % (maximum) Rockwell Hardness C scale 63 S (Sulfur) 0.025 % (maximum) Si (Silicon) 0.15 to 0.35 % Discrete attributes ~Checking Status Not verified - Original build Date Last Checked Thursday, October 17, 2013 Alloy Family Tool Steel Alloy Group Mold steel and special-purpose tool steel Alloy Sub-Group Water-hardening type steel Available forms Wrought Base Element Fe (Iron) Country Hungary Material Class Ferrous Alloy Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Specification Status Active Specification Type Standard Standards Body MSZ (Hungary) Short text attributes Composition Note_old Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Country* Hungary Description_old Quenched Designation S121 Specification MSZ 4354 Long text attributes Composition Note Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Description Quenched Hyperlink attributes Similar Alloys Click here to find similar alloys Integer attributes Specification Year 1982 Further Information Organizations Magyar Szabvanyugyi Testulet (MSZT) (Hungarian Standards Institution)
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Range attributes

C (Carbon)

1.15 to 1.24