42CrMo Steel Equivalent, Chemical Composition, Mechanical Properties

42CrMo steel crankshaft
A kind of crankshaft made from 42CrMo steel


42CrMo steel is a Chinese alloy steel, and has high strength and toughness, good hardenability, and no obvious temper brittleness. After quenching and tempering treatment, it has high fatigue limit and resistance to multiple impacts, and good low temperature impact toughness.


42CrMo alloy steel generally used for engineering steel purpose, and for making important parts requiring higher strength and larger size of the quenched section than 35CrMo steel, such as shafts, crankshafts, large gears for locomotive traction, supercharger gears, gearbox gears, engine cylinders, oil drill pipe joints, large load rods and spring clips.


42CrMo Steel Chemical Composition

Chemical Composition %
Steel GradeCSiMnPSCrMo
42CrMo0.38 to 0.450.17 to 0.370.50 to 0.80≤ 0.030≤ 0.0300.90 to 1.200.15 to 0.25

42CrMo Alloy Steel Mechanical Properties

  • Yield strength: ≥ 930 MPa
  • Tensile strength: ≥ 1080 MPa
  • Elongation: ≥12%
  • Rate of reduction in area: ≥45%
  • Impact absorbing energy: ≥ 63 J
  • Material Brinell hardness: ≤229 (Annealed or high temperature tempered steel rod)
  • Sample diameter: 25mm

Heat treatment specification

  • First quenching heating temperature: 850 °C (Cooling – oil)
  • Tempering heating temperature: 560 °C (Cooling – water, oil)


42CrMo steel equivalent to US AISI ASTM, European EN (Germany DIN EN, UK BSI EN, France NF EN, Japan JIS, and ISO standard.

StandardGradeStandardGradeStandardGrade (Steel number)StandardGrade (Steel number)StandardGradeStandardGrade (Steel number)StandardGrade
GB/T 307742CrMoSAE, AISI;
AISI 4140 steelDIN EN 10083-342CrMo4 (1.7225)BS EN 10083-342CrMo4 (1.7225)JIS G4105SCM440NF EN10083-342CrMo4 (1.7225)ISO 683-1743CrMo4

You may also be interested in 42crmo vs 4140, 42CrMo4 (EN 1.7225) Steel


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