Chemical Composition Base Element Fe (Iron) C (Carbon) 0.37 to 0.44 % Cr (Chromium) 0.65 to 0.95 % Cu (Copper) 0.35 % (maximum) Fe (Iron) 94.7 to 96.5 % (estimate) Mn (Manganese) 0.55 to 0.9 % Mo (Molybdenum) 0.2 to 0.3 % Ni (Nickel) 1.55 to 2 % P (Phosphorus) 0.025 % (maximum) S (Sulfur) 0.025 % (maximum) Si (Silicon) 0.15 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. 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 ASTM (USA) Description Cold-finished alloy steel bars. Designation 4340H Specification Type Standard Specification ASTM A331-95 Specification Year 2000 Specification Status Obsolete Specification Status Notes withdrawn 2004 Source Worldwide Guide to Equivalent Irons and Steels, 5th ed.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 American Society for Testing and Materials (ASTM)
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Chemical Composition