The 42CrMo chemical composition and mechanical properties

Chemical Composition
Carbon C: 0.38 ~ 0.45%
Silicon Si: 0.17 ~ 0.37%
Manganese Mn: 0.50 ~ 0.80%
The sulfur S: allow the residual content ≤ 0.035%
The phosphorus P: allow the residual content ≤ 0.035%
Chromium Cr: 0.90 ~ 1.20%
Ni: to allow the residual content ≤ 0.030%
Cu: to allow the residual content ≤ 0.030%
Molybdenum Mo: 0.15 ~ 0.25%
42CrMo allowable stress
42CrMo allowable stress 186 ~ 310/MPa, yield point 930σs/MPa, the 42CrMo strength, high hardenability, toughness, and quenching

Fire when the deformation is small, the high temperature, high creep strength and rupture strength. 42CrMo for manufacturing requirements 35CrMo steel strength higher than and

Greater cross-section of quenched and tempered forgings
Mechanical Properties
Tensile strength σb (MPa): ≥ 1080 (110)
Yield strength σs (MPa): ≥ 930 (95)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness value of alpha kv (J/cm2): ≥ 78 (8)
Hardness: ≤ 217HB
Sample size: Sample size is 25mm rough