Chemical Composition Base Element Fe (Iron) C (Carbon) 0.16 to 0.23 % Cr (Chromium) 0.6 to 0.9 % Fe (Iron) 95.4 to 97.1 % (estimate) Mn (Manganese) 0.5 to 0.9 % Mo (Molybdenum) 0.25 to 0.35 % Ni (Nickel) 1.4 to 1.7 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.02 to 0.04 % Si (Silicon) 0.4 % (maximum) 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 Brinell Hardness 229 (maximum) Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Nickel chromium molybdenum steel Alloy Sub-Group 4320/4320H Country United Kingdom Standards Body BSI (United Kingdom) Description Case hardening steel; ann to max hardness requirements. Alternate Name 1.6571 Designation 20NiCrMoS6-4 Specification Type Standard Specification BS EN 10084 Specification Year 1998 Specification Status Active Specification Status Notes active 1998 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 British Standards Institution (BSI)
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Chemical Composition