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研究了终轧温度和终冷温度对建筑用钢力学性能的影响,并在此基础上优化了适宜的轧制制度,考察了冷却速度和晶粒尺寸对建筑用钢屈强比与组织的影响。结果表明,随着终轧温度的升高,建筑用钢的抗拉强度逐渐上升,而屈服强度变化幅度不大,屈强比逐渐减小;随着终冷温度的上升,建筑用钢的抗拉强度和屈服强度逐渐降低,且断后伸长率和屈强比也呈现逐渐降低的趋势;通过控制热轧工艺参数使得组织中硬相和软相的含量可以对建筑用钢的屈强比进行很好的调节。
The effects of finishing temperature and final cooling temperature on the mechanical properties of construction steels were studied. Based on this, the suitable rolling system was optimized. The effects of cooling rate and grain size on the yield strength and microstructure of the building steels were investigated. . The results show that with the increase of the finishing temperature, the tensile strength of the steel for construction gradually increases, but the yield strength does not change a lot, and the yield ratio decreases gradually. With the increase of the final cooling temperature, The tensile strength and yield strength decreased gradually, and the elongation and yield ratio tended to decrease gradually. By controlling the parameters of the hot rolling process, the content of the hard phase and the soft phase in the structure could be used for the yield ratio of the construction steel Very good adjustment.