25Cr2MoVA, alloy structural steel.

Unified digital code: A31253. Standard: GB/T3077-1999

Chemical composition
C: 0.22 ~ 0.29

Si: 0.17 ~ 0.37

Mn: 0.40 ~ 0.70

Cr: 1.50 ~ 1.80

Mo: 0.25 ~ 0.35

V: 0.15 ~ 0.30

Gravitational properties of
Sample size [blank]

25mm

[Heat]

Quenching temperature (℃): 900; Coolant: Oil

Tempering heating temperature (℃): 640; coolant: air

[Mechanical properties]

Tensile strength (σb / MPa): ≧ 930

Yield point (σs / MPa): ≧ 785

Elongation (δ5 /%): ≧ 14

Reduction of (ψ /%): ≧ 55

Impact absorbed energy (Aku2 / J): ≧ 63

      Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 241