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建立了Q345E钢Φ600 mm大圆坯凝固传热模型,利用Procast软件对其连铸凝固过程进行了数值模拟,并通过射钉试验结果验证。研究结果表明:浇铸温度对铸坯的表面与中心温度以及固液相分布影响很小;拉速每增加0.02 m/min,铸坯表面温度无明显变化,糊状区向前移动,凝固末端离结晶器液面距离增加约1.75 m;二冷比水量每增加0.01 L/kg,其二冷区表面温度约降低30℃,糊状区向后移动少量,凝固末端后移0.3 m左右;适宜的工艺条件为浇铸温度1 539℃、拉速0.22 m/min、二冷比水量0.08 L/kg。实际生产的Q345E钢Φ600 mm大圆坯中心缩孔0.5级,中心疏松1.0级,碳偏析指数不大于1.09,完全满足标准要求。
The solidification heat transfer model of Φ600 mm circular billet of Q345E steel was established. Procast software was used to simulate the solidification process of continuous casting and the results were verified by the nailing test. The results show that the casting temperature has little effect on the surface temperature and the solid-liquid distribution of slab. For every increase of 0.02 m / min, the surface temperature of the slab does not change obviously, the pasty area moves forward, The surface temperature of the mold increases by about 1.75 m. For every 0.01 L / kg increase of the second cooling water ratio, the surface temperature of the second cooling zone decreases by about 30 ℃, the mushy zone moves backward a little and the solidification end moves back by about 0.3 m. The process conditions were casting temperature of 1 539 ℃, pulling speed of 0.22 m / min and cooling water ratio of 0.08 L / kg. The actual production of Q345E steel Φ600 mm round billet center shrinkage 0.5, center loose 1.0, carbon segregation index of not more than 1.09, fully meet the standard requirements.