论文部分内容阅读
建立温度计算模型针对φ22 mm和φ28 mm规格20MnSi棒材热连轧及控制冷却过程温度场进行了计算机模拟分析,获得了棒材精轧及轧后分级控冷过程的温度变化规律。对轧制圆钢和螺纹钢筋不同条件下成品道次温度变化特点进行了研究。研究结果是,轧制φ22 mm和φ28 mm规格20MnSi螺纹钢筋时的终轧温度比轧制相同规格圆钢时显著升高。轧制螺纹钢筋时精轧末道次轧材表层形成螺纹出现较大的局部应变量和应变速率,由此产生大量变形热是终轧钢筋表层急速升温的根本原因。与轧制圆钢相比,为完成同等控冷效果及有效控制轧后组织性能,20MnSi螺纹钢筋精轧后第1水冷段的换热系数明显较高,因此需要相应采用较大的冷却水量。
A temperature calculation model was established for the temperature field of hot rolling and controlled cooling process of φ22 mm and φ28 mm 20MnSi bar. Computer simulation was carried out to get the temperature variation rule of bar rolling and post-rolling graded cooling process. The characteristics of temperature changes of finished pass under different conditions of rolled bar and rebar were studied. The result of the study is that the finishing temperature during rolling of 20MnSi rebar with φ22 mm and φ28 mm specifications is significantly higher than that of the same specification bar rolled. When the thread rebar is rolled, the local local strain and strain rate appear on the surface layer of the final pass rolling steel strip, resulting in a large amount of deformation heat which is the root cause of rapid surface temperature increase of the finish rolled rebar. Compared with rolled bar, in order to achieve the same control of cooling effect and effectively control the microstructure and properties after rolling, the heat transfer coefficient of the first water-cooled section of 20MnSi rebar after finishing rolling is obviously higher, so a larger amount of cooling water is required.