SUS430不锈钢线状缺陷分析及控制

Analysis and control of SUS430 stainless steel linear defects

通过对轧辊和下导卫进行排查,分析加热温度的影响,结合SEM检测分析得出:下机轧辊表面有粗糙带出现,下导卫无发生刮擦现象,轧辊表面的粗糙带对一定辊役量下缺陷发生影响不大。线状缺陷出现前后加热工艺没有明显差异。线状缺陷产生是由于轧制中间坯减薄导致轧辊粗糙带与钢卷表面轧制受力增加所致。后续通过稳定加热温度,优化中间坯轧制厚度,加强热轧在线表检检查力度,发生问题及时检查并采取提前换辊的措施,线状缺陷得到控制。

Through checking the roll and lower guide,analyzing the influence of heating temperature,in combination with SEM detection and analysis,it is concluded that there is rough band on the surface of the lower mill roll and no scratch on the lower guide,while the rough band on the surface of the roll has little influence on the defects under a certain amount of roll service.There is no significant difference in heating process before and after occurring of linear defects.The linear defect is caused by the increase of rolling force on the surface of rough strip and steel coil due to the thinning of intermediate billet.Subsequently,by stabilizing the heating temperature,optimizing the rolling thickness of intermediate billets,strengthening the online surface inspection of hot rolling,timely inspecting problems and taking measures to change rolls in advance,the linear defects have been controlled.