Executive Standard: JIS G4053-2003
● Chemical Composition:
Carbon C: 0.36 ~ 0.43
Si Si: 0.15 ~ 0.35
Manganese Mn: 0.60 ~ 0.90
Sulfur S: allow the residual content ≤ 0.025
Phosphorus P: allow the residual content ≤ 0.025
Chromium Cr: 0.60 ~ 1.00
Ni-Ni: 1.60 ~ 2.00
Copper Cu: allow the residual content ≤ 0.025
Mo Mo: 0.15 ~ 0.30
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 55
Impact energy Akv (J): ≥ 78
Impact toughness αkv (J/cm2): ≥ 98 (10)
Hardness: ≤ 269HB Sample Size: Sample size is 25mm rough
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 850 ℃, oil cooling; tempering 600 ℃, 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.
