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在实验室试制了X120管线钢,并绘制了X120管线钢的连续冷却转变曲线。结果表明:热轧态时试验钢的屈服强度平均值为905 MPa,抗拉强度平均值为980 MPa,伸长率平均值为17%,屈强比为0.92,-20℃的冲击功平均值为90J。经600℃回火2h后,试验钢的屈服强度平均值达到了950 MPa,抗拉强度平均值达到了1 000 MPa,伸长率平均值为18%,屈强比为0.95,-20℃的冲击功平均值为95J。经过压缩后,冷却速度为5℃/s时试验钢的组织即全部为板条贝氏体组织,而该组织为X120级管线钢中的理想组织。
The X120 pipeline steel was piloted in the laboratory and the continuous cooling transformation curve of X120 pipeline steel was drawn. The results show that the average yield strength of the test steel during hot rolling is 905 MPa, the average tensile strength is 980 MPa, the average elongation is 17%, the yield ratio is 0.92, the average value of impact energy at -20 ℃ 90J. After tempering at 600 ℃ for 2h, the average yield strength of the test steel reached 950 MPa, the average tensile strength reached 1 000 MPa, the average elongation was 18%, the yield ratio was 0.95, The average impact energy is 95J. After compression, the cooling rate of 5 ℃ / s when the test steel structure that is all lath bainitic tissue, and the organization for the X120 grade ideal organization in the pipeline.