Details:
Chemical composition:
Carbon C: 0.33 ~ 0.38
Si Si: 0.15 ~ 0.35
Manganese Mn: 0.60 ~ 0.90
Sulfur S: to allow the residual content ≤ 0.030
Phosphorus P: to allow the residual content ≤ 0.030
Chromium Cr: 0.80 ~ 1.05
Ni: to allow the residual content of ≤ 0.25 Copper Cu: to allow the residual content ≤ 0.030
Mechanical properties:
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)
Hardness: ≤ 207HB
Sample size: Sample size is 25mm rough
Heat treatment and microstructure specifications:
Standard heat treatment: quenching 860 ℃, oil cooling; tempering 500 ℃, water-cooled, oil-cooling.
Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
