After heat treatment or cold hardening has higher strength and elasticity, cold deformation plasticity is low, hardenability is not good, the ability to withstand dynamic load and fatigue load is low, generally using oil quenching, large section components using water cooling + oil quenching, or normalizing treatment.
Chemical composition:
Carbon C ：0.56～0.64
Silicon Si：0.17～0.37
Manganese Mn：0.70～1.00
Sulfur S: ≤0.030
Phosphorus P：≤0.030
Chromium Cr：0.70～1.00
Nickel Ni：≤0.35
Copper Cu：≤0.25
Boron B ：0.0005～0.004
Mechanical properties:
Tensile strength σb (MPa): ≥ 1225 (125)
Conditional yield strength σ0.2 (MPa): ≥1078 (110)
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