U型冷却对先进高强钢酸轧轧制力波动行为的影响

Influence of U-type cooling on rolling force fluctuation behavior in acid rolling for advanced high-strength steel

针对某酸连轧产线生产高硅牌号DP780双相钢过程出现的头尾轧制力及厚度波动问题,从全流程生产工艺及钢种组织性能特性两方面进行了研究。研究表明,热轧头尾温度均匀性不一致,导致带钢头尾性能分布不均,造成了酸轧轧制力波动。通过对热轧工序采取卷取过程U型冷却工艺方式,提高了DP780双相钢头尾卷取温度,降低了热轧卷取过程出现的头尾与带体间的冷却差异性,有效改善了汽车高强钢在酸连轧生产过程中出现的轧制力及厚度波动现象。与原工艺相比,该高硅牌号DP780双相钢头尾轧制力降低约2500kN,且提高了轧制力稳定性,降低了头尾厚度波动,有效提升了酸连轧生产节奏。

For the problem of head-tail rolling force and thickness fluctuation in the process of producing high silicon DV780 dual phase steel by PL -TCM,the whole production process and steel structure and property characteristics were studied.The research shows that the inconsistent temperature uniformity of hot roiling head and tail results in the uneven distribution of strip head and tail properties as well as acid rolling force fluctuation.By adopting the U-type cooling method in the coiling process for the hot roiling operation,the coiling temperature of head and tail for DP780 dual phase steel is increased,and the cooling difference among the head,tail and belt body in the coiling process of hot roiled steel is reduced.Thus,the rolling force and thickness fluctuation phenomenon of automobile high-strength steel in the acid continuous rolling process are effectively improved.Compared with the original process,the rolling force of head and tail for high silicon DP780 dual phase steel is reduced by about 2500kN,and the rolling force stability is obviously improved.Furthermore,the thickness fluctuation of head and tail is obviously improved,and the production efficiency is improved effectively.