In response to the issue of flatness defects of the steel strip as reflected by the terminal market,this paper commences from the formation mechanism of residual stress and,in combination with the research on hot-rolling production practices,proposes quality control measures for residual stress under multiple coupled fields.Through investigating and addressing water leakage and blockage in the rolling line processes,enhancing the control precision of equipment functions,optimizing the chamfer design of the support rolls and the matching with the rolling line to control the flatness accuracy,optimizing the layer cooling mode and the cooling water ratio to reduce the temperature difference between the edge and the center during the cooling process,and implementing the self-tempering process for the stored steel coils,the flatness during the process and the flatness of the finished products have been significantly improved.The weight of quality disputes regarding flatness defects before and after the research has decreased by 48.5％year-on-year,and the proportion of defect-related quality disputes in the total has dropped by 25.7％.
维普
万方数据