Alloy structural steel: 20CrNiMo
Standard: GB / T 3077-1988
● Chemical Composition:
Carbon C: 0.17 ~ 0.23
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.60 ~ 0.95
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.40 ~ 0.70
Ni-Ni: 0.35 ~ 0.75
Copper Cu: to allow the residual content ≤ 0.030
Mo Mo: 0.20 ~ 0.30
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 785 (80)
Elongation δ5 (%): ≥ 9
Reduction of area ψ (%): ≥ 40
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Hardness: ≤ 197HB
Sample size: Sample size is 15mm rough
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 850 ℃, oil cooling; tempering 200 ℃, air-cooled.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
Standard: GB / T 3077-1988
● Chemical Composition:
Carbon C: 0.17 ~ 0.23
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.60 ~ 0.95
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.40 ~ 0.70
Ni-Ni: 0.35 ~ 0.75
Copper Cu: to allow the residual content ≤ 0.030
Mo Mo: 0.20 ~ 0.30
● Mechanical Properties:
Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 785 (80)
Elongation δ5 (%): ≥ 9
Reduction of area ψ (%): ≥ 40
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Hardness: ≤ 197HB
Sample size: Sample size is 15mm rough
● Heat treatment and microstructure specifications:
Standard heat treatment: quenching 850 ℃, oil cooling; tempering 200 ℃, air-cooled.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
