Standard: GB / T 3077-1988
Chemical Composition: Carbon C: 0.17 ~ 0.24 ,Si Si: 0.17 ~ 0.37 ,Manganese Mn: 1.30 ~ 1.60 ,S S: to allow the residual content ≤ 0.035 ,P P: ≤ 0.035 to allow the residual content Chromium Cr: allow the residual content ≤ 0.030 ,Ni-Ni: ≤ 0.030 to allow the residual content ,Copper Cu: ≤ 0.030 to allow the residual content ,Ti Ti: 0.04 ~ 0.10 B B: 0.0005 ~ 0.0035
Mechanical Properties:
Tensile strength σb (MPa): ≥ 1130 (115)
Yield strength σs (MPa): ≥ 930 (95)
Elongation δ5 (%): ≥ 10
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 55
Impact toughness αkv (J/cm2): ≥ 69 (7)
Hardness: ≤ 187HB
Sample size: Sample size is 15mm rough
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