Material Name: Gear Steel 20CrNiMo
● Chemical Composition:
Carbon C: 0.17 ~ 0.23
Si Si: 0.17 ~ 0.37
Mn Mn: 0.60 ~ 0.95
Sulfur S: to allow the residual content ≤0.035
Phosphorus P: to allow the residual content ≤0.035
Chromium Cr: 0.40 ~ 0.70
Ni Ni: 0.35 ~ 0.75
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:
Heat treatment specifications: quenching 850 ℃, oil cooling; tempering 200 ℃, air cooling.
● Delivery status: to heat treatment (normalizing, annealing or tempering) or without heat treatment delivery, the delivery status should be specified in the contract. |
