Chemical Composition Base Element Fe (Iron) C (Carbon) 0.38 to 0.43 % Cr (Chromium) 0.7 to 0.9 % Fe (Iron) 95.1 to 96.3 % (estimate) Mn (Manganese) 0.6 to 0.85 % Mo (Molybdenum) 0.2 to 0.3 % Ni (Nickel) 1.65 to 2 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.04 % (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. Mechanical Properties Yield Strength 725 MPa (minimum) Ultimate Tensile Strength 860 MPa (minimum) Elongation 16 % strain (minimum) 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 Ni-Cr-Mo alloy bolting materials for pressure vessels for low-temp service; QT, <=100 mm. Designation L43 Specification Type Standard Specification ASTM A320/A320M Specification Year 2004 Specification Status Active Specification Status Notes active 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