A high static strength, impact toughness and high fatigue limit, hardenability than 40Cr high temperature under high creep strength and rupture strength of long-term operating temperature up to 500 ℃; cold plastic deformation of the middle, poor welding. Used in high load of the important structural components, such as vehicle and engine transmission parts; turbine rotor, spindle, heavy loads of drive shaft, a large cross-section parts

● Chemical Composition:

Carbon C: 0.32 ~ 0.40

Si Si: 0.17 ~ 0.37

Manganese Mn: 0.40 ~ 0.70

Sulfur S: to allow the residual content of ≤ 0.035

Phosphorus P: allow the residual content ≤ 0.035

Chromium Cr: 0.80 ~ 1.10

Ni: to allow the residual content of ≤ 0.030

Copper Cu: to allow the residual content ≤ 0.030

Mo Mo: 0.15 ~ 0.25

● Mechanical Properties:

Tensile strength σb (MPa): ≥ 985 (100)

Yield strength σs (MPa): ≥ 835 (85)

Elongation δ5 (%): ≥ 12

Reduction of area ψ (%): ≥ 45

Impact energy Akv (J): ≥ 63

Impact toughness αkv (J/cm2): ≥ 78 (8)

Hardness: ≤ 229HB

Sample size: Sample size is 25mm rough