GB / T3077 20CrMnMo alloy structure steel round bar is a high strength of advanced carburizing steel, higher strength than 15CrMnMo, hardenability and mechanical properties than 20CrMnTi high. 20CrMnMo alloy structure steel round bar low quenching after tempering has good mechanical properties and low temperature impact toughness.
Chemical composition(%):
C:0.17-0.23 Si:0.17-0.37 Mn:0.90-1.20 S≤0.035 P≤0.035 Cr:1.10-1.40 Ni≤0.030 Cu≤0.030 Mo:0.20-0.30
Mechanical property:
Tensile strength(σ b/MPa)≥1180
Yield strength(σ s/MPa)≥10
Section shrinkage (ψ /%)≥45
Elongation rate (δ 5/%): ≧ 10
Heat Treatment:
Quenching temperature (℃): 850; Coolant: oil
Tempering heating temperature (℃): 200; coolant: water, air
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