Material alloy structural steel: 40CrNiMoA
Standard: GB / T 3077-1988
● Chemical Composition:
Carbon C: 0.37 ~ 0.44
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.50 ~ 0.80
Sulfur S: allow the residual content ≤ 0.025
Phosphorus P: allow the residual content ≤ 0.025
Chromium Cr: 0.60 ~ 0.90
Ni-Ni: 1.25 ~ 1.65
Copper Cu: allow the residual content ≤ 0.025
Mo Mo: 0.15 ~ 0.25
● 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.