热轧带钢厚规格板形控制技术研究与应用

RESEARCH AND APPLICATION OF SHAPE CONTROL TECHNOLOGY FOR HOT ROLLED THICKNESS STRIP

对厚度T≥5.0mm规格的热轧带钢板形不良缺陷的形成原因进行了分析和研究,最终确定粗精轧的不对称轧制、成品凸度过小以及轧后不均匀冷却是造成厚规格板形不良的主要因素。通过提高对中轧制精度、板凸度控制、辊型优化、微中浪轧制策略、调节层冷区域两侧水量偏差及改善侧喷反喷效果等,有效降低了厚规格板形不良缺陷的产生,板凸度合格率由53%提高至92%,板形不良率由1.9%降低至0.1%以下,厚规格板形得到了显著改善。

The causes of bad shape defect of hot rolled strip with thickness of T (> 5.0 mm) were analyzed and studied. It was determined that asymmetric rolling in roughing and finishing rolling, too small crown of finished product and uneven cooling after rolling were the main factors causing bad shape of thick rolled strip. By improving the accuracy of medium rolling, crown control, roll shape optimization, micro-medium wave rolling strategy, water volume deviation on both sides of adjusting layer cooling zone and side spraying back spraying effect, the occurrence of defective flatness of thick gauge is effectively reduced. The qualified rate of plate crown is increased from 53% to 92%, the defective rate of flatness is reduced from 1.9% to less than 0.1%, and the thickness is reduced from 1.9% to 0.1%. Specification flatness has been significantly improved.