Reason and Control on Edge Cracks of J55 Hot Rolled Strip
LIU Guo-liang1,NI You-jin2,JI Chen-xi1,CUI Yang1,CHEN Jin2,BAO Chun-lin1
1. Strip Technology Department, Shougang Research Institute of Technology, Beijing 100043, China 2. Shougang Qian’an Iron and Steel Co., Ltd., Qian’an 064404, Hebei, China
Abstract：The edge crack was investigated through optical microscope and SEM, and the reasons of edge crack were analyzed. Results show that transversal corner cracks of slabs are the origin of the edge cracks of hot rolled strips, and AlN, Nb(N, C) precipitates around the prior austenite grain boundaries due to intensive cooling rate rendered the slabs more susceptible to cracks. After rolling stands, the transverse cracks of the slabs will propagate to serrated edge cracks．
刘国梁,倪有金,季晨曦,崔阳,陈瑾，包春林. J55热轧板卷边部裂纹成因及控制分析[J]. 钢铁, 2012, 47(10): 61-65.
LIU Guo-liang1,NI You-jin2,JI Chen-xi1,CUI Yang1,CHEN Jin2,BAO Chun-lin1. Reason and Control on Edge Cracks of J55 Hot Rolled Strip. Iron and Steel, 2012, 47(10): 61-65.
2012, Vol. 47 
