34CrMo4 chemical composition and mechanical properties

Chemical Composition
Carbon C: 0.30 ~ 0.37
Silicon Si: 0.10 ~ 0.40
Manganese Mn: 0.60 ~ 0.90
Sulfur S: allow the residual content ≤ 0.035
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 ~ 0.30
Mechanical Properties
Tensile strength σb (MPa): ≥ 985 (100)
Yield strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness value of alpha kv (J/cm2): ≥ 78 (8)
Hardness: ≤ 229HB
Sample size: Sample size is 25mm rough