alloy structural steel. Unified digital code: A31132. Standard: GB/T3077-1999

Chemical composition

C:0.07 0.15

Si:0.18 0.37

Mn:0.41 0.70

Cr:0.90 1.20

Mo:0.25 0.35

V:0.15 0.30

Mechanical properties

[ ] sample blank size

30mm

[ ] heat treatment

The heating temperature of quenching ( c ): 970: free coolant;

Tempering temperature ( c ): 750: free coolant;

Mechanical properties of [ ]

Pull strength (σ b/MPa≥ 490 ):

Yield point (σ s/MPa≥ 245 ):

Elongation (δ 5/% ):≤ 22

Section shrinkage (ψof≥ 50 ):

Impact absorbing energy ( Aku2/J ) : 71

Impact toughness ofα kV ( J/cm2 )≥ 88 ( 9):

Brinell hardness ( HBS100/3000 ) ( or high temperature tempering annealing state ):≤ 179