淬火温度对石油套管用钢27MnCrV冲击韧性的影响

Effect of Quenching Temperature on Impact Toughness of Steel 27MnCrV for Petroleum Casing Pipe

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。

Abstract The effect of quenching at 890 - 780 ℃ on transverse impact energy of steel 27MnCrV （%：0.24～0.30C,0.50～0.70Cr,0.06-0.10V） for petroleum casing pipe tempered at 630 ℃ 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℃＋ tempering at 630℃ from 35 J by quenching at 890℃＋ tempering at 630 ℃. The optimum heat treatment process of steel 27MnCrV is water quenching at 830 ℃± 10 ℃ ＋ tempering at 630 ℃ 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.