Standard: GB / T 3077-1988
Chemical Composition (mass fraction) (%) Carbon C: 0.32 ~ 0.39 ,Si Si: 0.17 ~ 0.37 ,Manganese Mn: 0.50 ~ 0.80 ,S S: to allow the residual content ≤ 0.035 ,P P: ≤ 0.035 to allow the residual content ,Chromium Cr: 0.80 ~ 1.10,Ni-Ni: ≤ 0.030 to allow the residual content ,Copper Cu: ≤ 0.030 to allow the residual content
Mechanical properties
Sample blank size (mm): 25
Heat treatment:
Tensile strength σb (MPa): ≥ 930 (95)
Yield strength σs (MPa): ≥ 735 (75)
Elongation δ5 (%): ≥ 11
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
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