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对试制的X80级抗大变形管线钢不同开始冷却温度下的力学性能进行了测试,并通过扫描电镜分析了不同开始冷却温度下钢板最终组织及形态,研究了控轧控冷工艺对X80级抗大变形管线钢组织与性能的影响。结果表明,随着钢板开始冷却温度的降低,X80级管线钢中的先共析铁素体量逐渐增加,贝氏体含量逐渐降低,钢板抗大变形性能参数提高。当开始冷却温度在740℃时,钢板具有最佳的综合力学性能,其屈服强度Rt0.5为565MPa,抗拉强度Rm为730MPa,伸长率A为42.7%,屈强比Rt0.5/Rm为0.75,Rt1.5/Rt0.5为1.181,Rt2.0/Rt1.0为1.116,均匀变形伸长率达到12.33%,具有较强的抗变形能力。
The mechanical properties under different starting cooling temperature of X80 grade large deformation pipeline steel were tested. The final microstructure and morphology of the steel at different initial cooling temperature were analyzed by scanning electron microscope. The effects of controlled rolling and cooling process on the mechanical properties of X80 grade Effect of Large Deformation Pipeline Steel on Microstructure and Properties. The results show that as the cooling temperature begins to decrease, the pro-eutectoid ferrite content in X80 pipeline steel gradually increases, the bainite content gradually decreases, and the large deformation resistance parameters of the steel plate increase. When the initial cooling temperature is 740 ℃, the steel has the best comprehensive mechanical properties. Its yield strength Rt0.5 is 565MPa, tensile strength Rm is 730MPa, elongation A is 42.7%, yield ratio Rt0.5 / Rm Is 0.75, Rt1.5 / Rt0.5 is 1.181, Rt2.0 / Rt1.0 is 1.116, the average deformation elongation reaches 12.33%, has a strong resistance to deformation.