C ：0.32～0.39
Si：0.17～0.37
Mn：0.50～0.80
S ：≤0.035
P ：≤0.035
Cr：≤0.25
Ni：≤0.30
Cu：≤0.25
Si：0.17～0.37
Mn：0.50～0.80
S ：≤0.035
P ：≤0.035
Cr：≤0.25
Ni：≤0.30
Cu：≤0.25
Tensile strength σb (MPa): ≥530 (54)
Yield strength σs (MPa): ≥315 (32)
Elongation rate δ5 (%): ≥20
Section shrinkage ψ (%): ≥45
Impact energy Akv (J): ≥55
Impact toughness value αkv (J / cm2): ≥69 (7)
Yield strength σs (MPa): ≥315 (32)
Elongation rate δ5 (%): ≥20
Section shrinkage ψ (%): ≥45
Impact energy Akv (J): ≥55
Impact toughness value αkv (J / cm2): ≥69 (7)
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