Q195L钢方坯连铸二冷技术的优化

Optimization of secondary cooling technology for billet continuous casting Q195L

针对韶钢Q195L钢方坯存在严重的中心裂纹和中心缩孔问题,对方坯连铸二次冷却工艺进行了试验优化。通过建立凝固数学模型计算二冷区的铸坯表面温度分布,分析并调整连铸比水量和二冷区水量分配,制定了满足Q195L钢连铸工艺要求的二冷控制制度。生产应用表明,Q195L钢连铸坯内部质量明显提高,铸坯中间裂纹不大于1级的比例由90.74%提高到100%,中心缩孔不大于1级的比例由83.33%提高到92.50%,中心疏松不大于1级的比例由96.30%提高到97.50%。

Owing to the existence of serious central crack and shrink hole in Q195L billet at Shao Steel, the secondary cooling process of billet continuous casing was optimized. It includes： establishing a mathematical model of solidification process to calculate the billet surface temperature distribution in the secondary cooling zone, analyzing and adjusting the rate of secondary cooling water as well as the distribution of cooling water. The application of optimized secondary cooling control scheme showed that the internal quality of Q195L billet improved obviously, the ratio of central crack ≤ 1.0 increased from 90.74% to 100 %, the ratio of central shrinkage cavity ≤ 1.0 increased from 83.33 % to 92.50 %, the ratio of center looseness ≤ 1.0 raised from 96.30 % to 97.50 %.