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通过对加热温度、终轧温度、冷却速度及卷取温度的控制,并对试验样品进行组织分析和力学性能测试,研究了热轧工艺对Q345B钢组织和性能的影响。根据试验结果确定了最佳的工艺方案为加热温度(1180±20)℃、终轧温度为(870±20)℃、精轧总变形量为84.28%、冷却速率控制在(10±2)℃/s、卷取温度控制在(620±20)℃。通过生产实践证明此工艺性能稳定,轧后钢板可获得优良的综合力学性能。
The effects of hot rolling process on the microstructure and properties of Q345B steel were studied by controlling the heating temperature, finishing temperature, cooling rate and coiling temperature. The microstructure and mechanical properties of the tested samples were also studied. According to the test results, the best technological scheme was determined as heating temperature (1180 ± 20) ℃, finishing temperature (870 ± 20) ℃, total rolling deformation of 84.28% and cooling rate of (10 ± 2) ℃ / s, coiling temperature control (620 ± 20) ℃. Through the practice of production proved that the process performance is stable, rolling plate can obtain excellent mechanical properties.