20CrNiMoA chemical composition and mechanical properties

Chemical Composition

Carbon C: 0.17 ~ 0.23
Silicon Si: 0.17 ~ 0.37
Manganese Mn: 0.60 ~ 0.95
Sulfur S: allow the residual content ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.40 ~ 0.70
Nickel Ni: 0.35 ~ 0.75
Cu: to allow the residual content ≤ 0.030
Molybdenum Mo: 0.20 ~ 0.30

Mechanical Properties

Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 785 (80)
Elongation δ5 (%): ≥ 9
Reduction of area ψ (%): ≥ 40
Impact energy Akv (J): ≥ 47
Impact toughness value of alpha kv (J/cm2): ≥ 59 (6)
Hardness: ≤ 197HB
Sample size: Sample blank dimensions of 15mm