Chemical Composition Base Element Fe (Iron) C (Carbon) 0.44 % (maximum) Cr (Chromium) 0.7 to 0.95 % Fe (Iron) 95 to 97.3 % (estimate) Mn (Manganese) 0.9 % (maximum) Mo (Molybdenum) 0.2 to 0.3 % Ni (Nickel) 1.65 to 2 % P (Phosphorus) 0.025 % (maximum) S (Sulfur) 0.025 % (maximum) Si (Silicon) 0.2 to 0.35 % 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 1.44e7 lbf/ft^2 Ultimate Tensile Strength 1.73e7 lbf/ft^2 Elongation 16 % strain 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 Forging for shipboard applications; 10 in. max section thick Designation Type I Class C Specification Type Standard Specification MIL-S-24093A Specification Year 1991 Specification Status Active Specification Status Notes Active 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