Tensile strength σ b (MPa): ≥ 4 10 (42)
Yield strength σ s (MPa): ≥ 265 (27)
Elongation Δ 5 (%): ≥ 24
Area shrinkage ψ(%):60
Impact work akv (j): ≥ 1 10.
Impact toughness value α kV (j/cm2): ≥137 (14)
Hardness: ≤ 179HB
Sample size: the blank size of the sample is 30mm.
Heat treatment specification and metallographic structure of alloy pipe;
Heat treatment specification: 900℃ quenching, air cooling; Tempering at 650℃ and air cooling.