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通过模拟控轧控冷工艺,借助金相观察及力学性能测试,研究了550 MPa级抗震建筑钢不同终冷温度下双相组织的衍变规律,分析了影响试验钢力学性能变化的因素,讨论了试验钢屈强比变化的机理。结果表明:当终冷温度为440℃时,试验钢屈服强度、伸长率和屈强比良好,抗震性能最好。
Through the simulation of controlled rolling and controlled cooling process, with the help of metallographic observation and mechanical property test, the law of dual phase microstructure evolution of 550 MPa-class aseismic building steel under different final cooling temperatures was studied. The factors influencing the mechanical properties of test steel were analyzed. Experimental steel yield strength ratio mechanism. The results show that when the final cooling temperature is 440 ℃, the yield strength, elongation and yield ratio of the test steel are good and the seismic performance is the best.