热轧带钢尾部横裂纹形成原因分析  

Analysis of Formation Cause of Transverse Crack in the Tail of Hot Rolled Strip

作　　者：李圣贤[1] 赵萌[1] 李明[1] 王本超[1] 肖沛文[1] 王永民[1] 李娜[1] 

机构地区：[1]邯钢集团邯宝钢铁有限公司制造部,河北邯郸056015

出　　处：《轧钢》2010年第2期54-56,共3页Steel Rolling

摘　　要：针对邯宝钢铁公司热轧带钢尾部上表面出现横裂纹现象,进行了金相检验,发现裂纹根部无扩展,裂纹两侧组织存在差异,结合现场生产实际,确定横裂纹的产生与中间坯尾部局部过冷有关。从而采取提高板坯出炉温度和板坯尾部温度、严格控制中间坯尾部翘头和除鳞制度的措施,基本杜绝了带钢尾部横裂纹现象。In view of appearing transverse cracks on the tail surface of the hot rolled strip, the metallographic examination of crack zone was carried out. The results showed that the microstructures of the crack zone and base body were different, and the crack was not expanded at the root of crack. Based on the practical produc- tion, the cause was considered the super-cooling at the tail of strip. Therefore, some measures, such as improving the temperature values of slab drop-out furnace and strip tail , strict controlling the strip tail camber and the descaling scheme, were applied. At last , the transverse cracks defect on the tail surface of strip was eliminated.

关 键 词：横裂纹 局部过冷 形变应力 热轧带钢 

分 类 号：TG335.11[金属学及工艺—金属压力加工]