J55热轧板卷边部裂纹成因及控制分析  

Reason and Control on Edge Cracks of J55 Hot Rolled Strip

作　　者：刘国梁[1] 倪有金[2] 季晨曦[1] 崔阳[1] 陈瑾[2] 包春林[1] 

机构地区：[1]首钢技术研究院薄板所,北京100043 [2]首钢迁安钢铁有限责任公司,河北迁安064404

出　　处：《钢铁》2012年第10期61-65,共5页Iron and Steel

摘　　要：利用金相、扫描电镜等对J55边部裂纹进行了观察,并对边部裂纹的产生原因进行了分析,研究表明:连铸坯表面的角横裂纹是热轧板卷边部裂纹产生的主要根源,连铸坯角部过冷导致奥氏体晶界细小的AlN、Nb(N,C)析出,加剧了连铸坯对裂纹的敏感性,连铸坯经过轧制后,连铸坯表面的角横裂纹扩展成为热轧板卷的边部裂纹。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 A1N, 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.

关 键 词：含铌钢 热轧板卷 边部裂纹 角横裂 

分 类 号：TG335.5[金属学及工艺—金属压力加工]