● Chemical Composition:
Carbon C: 0.10 ~ 0.17
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.30 ~ 0.60
Sulfur S: to allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 allow the residual content
Chromium Cr: 0.60 ~ 0.90
Ni-Ni: 1.50 ~ 1.90
Copper Cu: to allow the residual content ≤ 0.030
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 785 (80)
Yield strength σs (MPa): ≥ 590 (60)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 50
Impact energy Akv (J): ≥ 63
Impact toughness αkv (J/cm2): ≥ 78 (8)
Hardness: ≤ 207HB
Sample size: Sample size is 15mm rough
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching: the first 860 ℃, the second 780 ℃, water, oil cooling; tempering 200 ℃, water, air-cooled.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
