热轧高强钢冷却板形控制技术的应用

针对热轧高强钢的板形缺陷问题,分析了轧制板形、冷却出口浪形以及成品实物浪形之间的关系。利用热成像仪,测量了层冷区域带钢的冷却温降、层冷集管两侧的流量偏差,确定了层流冷却不均问题是成品浪形产生的原因。实验研究表明,通过优化层冷集管流量分布的均匀性、调整侧喷水嘴的角度、优化侧喷吹扫效果、更改层冷上下水比,可以提高层冷区域带钢冷却的均匀性,改善热轧高强钢冷却过程中产生的板形质量缺陷,能够满足使用要求。

Application on cooling flatness control technology for hot rolling high strength steel

For the flatness defects of high strength steel, the relationships among the rolling shape, cooling export shape and final strip shape were analyzed.Then, the cooling temperature drop of strip steel in the cold layer zone and the flow deviation on both sides of the cold tube were measured by thermal imager, and it was determined that the uneven cooling problem of laminar flow was the cause of final strip shape.The experiment study shows that by optimizing the uniformity of the flow rate distribution of cold tube, adjusting the angle of the side nozzle, optimizing the spray sweep effect on the side and changing the upper and lower water ratio of the cold layer, the uniformity of strip steel in the cold layer zone is enhanced, and the quality defects of hot rolled high strength steel sheet is improved to meet the requirements of customers.