Abstract: The effect of quenching at 890 ~ 780 °C on transverse impact energy of steel 27MnCrV (% : 0. 24C - 0. 30C, 0. 50 ~0. 70Cr, 0. 06 ~0. 10V) for petroleum casing pipe tempered at 630 °C has been tested and studied. Results show that with decreasing the quenching temperature, the transverse*V- notch impact energy increases obviously ； with insuring non-decreasing tensile strength of steel, the minimum transverse impact energy increases to 66 J by quenching at 820 °C + tempering at 630 °C from 35 J by quenching at 890 °C+ tempering at 630 °C. The optimum heat treatment process of steel 27MnCrV is water quenching at 830 °C ± 10°C + tempering at 630 °C air cooling, its tensile strength is 847 〜860 MPa, Yield strength is 922 -930 MPa and impact energy is 57 ~66 J to meet the requirement of standard.

Key words: Steel 27MnCrV, Petroleum Casing Pipe, Quenching Temperature, Impact Toughness

摘要： 研究了890～780℃淬火对630℃回火的石油套管用钢27MnCrV(%:0.24～0.30C、0.50～0.70Cr、0.06～0.10V)横向冲击功的影响。结果表明,随淬火温度降低,该钢横向V-冲击功显著增加;在保证拉伸强度不降低的情况下,横向最小冲击功由890℃淬火+630℃回火的35 J提高到820℃+630℃回火的66 J。27MnCrV钢最佳热处理工艺为830℃±10℃水淬+630℃回火空冷,其屈服强度847～860 MPa,抗拉强度922～930 MPa,横向冲击功57～66 J,满足标准要求。

关键词: 27MnCrV钢, 石油套管, 淬火温度, 冲击韧性