Chemical Composition Base Element Fe (Iron) C (Carbon) 0.37 to 0.45 % Cr (Chromium) 0.9 to 1.2 % Cu (Copper) 0.3 % (maximum) Fe (Iron) 95.8 to 97.5 % (estimate) Mn (Manganese) 0.9 to 1.2 % Mo (Molybdenum) 0.2 to 0.3 % Ni (Nickel) 0.3 % (maximum) P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.035 % (maximum) Si (Silicon) 0.17 to 0.37 % 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 785 MPa (minimum) Ultimate Tensile Strength 980 MPa (minimum) Elongation 10 % strain (minimum) Other Information Material Class Ferrous Alloy Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group 4140/ 4142 Country China Standards Body SAC (China) Description Bar 25 mm diameter; CD; QT Designation 40CrMnMo Specification Type Standard Specification GB/T 3078 Specification Year 1994 Specification Status Active Specification Status Notes Active in 2005 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 China State Bureau of Quality and Technical Supervision (CSBTS) (GB/JB/YB)
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Chemical Composition