Range attributes C (Carbon) 0.37 to 0.45 % Cr (Chromium) 0.9 to 1.2 % Cu (Copper) 0.3 % (maximum) Elongation 10 % strain (minimum) 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 % Ultimate Tensile Strength 980 MPa (minimum) Yield Strength 785 MPa (minimum) Discrete attributes ~Checking Status Not verified - Original build Date Last Checked Thursday, October 17, 2013 Alloy Family Alloy Steel Alloy Group Chromium molybdenum steel Alloy Sub-Group 4140/ 4142 Available forms Wrought Base Element Fe (Iron) Country China Material Class Ferrous Alloy Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Specification Status Active Specification Type Standard Standards Body SAC (China) Short text attributes Composition Note_old 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. Country* China Description_old Bar 25 mm diameter; CD; QT Designation 40CrMnMo Specification GB/T 3078 Specification Status Notes Active in 2005 Long text attributes 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. Description Bar 25 mm diameter; CD; QT Hyperlink attributes Similar Alloys Click here to find similar alloys Integer attributes Specification Year 1994 Further Information Organizations China State Bureau of Quality and Technical Supervision (CSBTS) (GB/JB/YB)
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Range attributes

C (Carbon)

0.37 to 0.45