Chemical Composition Base Element Fe (Iron) C (Carbon) 0.38 to 0.45 % Cr (Chromium) 0.7 to 0.9 % Fe (Iron) 95.2 to 96.2 % (estimate) Mn (Manganese) 0.6 to 0.8 % Mo (Molybdenum) 0.2 to 0.3 % Ni (Nickel) 1.65 to 2 % P (Phosphorus) 0.035 % S (Sulfur) 0.04 % Si (Silicon) 0.15 to 0.3 % 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. Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Nickel chromium molybdenum steel Alloy Sub-Group 4340/ E4340 Country USA Standards Body MIL (USA) Description Shape Designation G43400 Specification Type Standard Specification MIL-S-46059 Specification Year 1987 Specification Status Obsolete Specification Status Notes Cancelled 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 Department of Defense (MIL/DoD-F/FED QQ)
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Chemical Composition