Chemical Composition Base Element Fe (Iron) C (Carbon) 0.17 to 0.23 % Cr (Chromium) 0.3 to 0.65 % Fe (Iron) 96.7 to 98.2 % (estimate) Mn (Manganese) 0.65 to 0.95 % Mo (Molybdenum) 0.15 to 0.25 % Ni (Nickel) 0.4 to 0.7 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.02 to 0.04 % Si (Silicon) 0.15 to 0.4 % 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. Mechanical Properties Yield Strength 9.82e6 lbf/ft^2 (minimum) Ultimate Tensile Strength 1.38e7 to 2.42e7 lbf/ft^2 Elongation 9 % strain (minimum) Brinell Hardness 212 (maximum) Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Nickel chromium molybdenum steel Alloy Sub-Group 8620/ 8720 Country International Standards Body ISO (International) Description Wrought case-hardening steels for machine parts; mech props vary with diameter, ann to max hardness. Alternate Name formerly 12a Designation 20NiCrMoS2 Specification Type Standard Specification ISO 683-11 Specification Year 1987 Specification Status Active Specification Status Notes active 1987 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Available forms Wrought Similar Alloys Click here to find similar alloys Links Organizations International Organization for Standardization (ISO)
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Chemical Composition

Base Element

Fe (Iron)