用光学显微镜、扫描电镜、透射电镜和能谱分析等方法研究了涟钢CSP热轧板卷边部裂纹的成因.结果表明:连铸坯表面的深振痕是热轧板卷边部裂纹的起源,连铸坯角部过冷导致奥氏体晶界AlN的细小析出,加剧了连铸坯对裂纹的敏感性.连铸坯经过精轧机组的轧制后,连铸坯表面的横裂纹扩展成为热轧板卷的锯齿状裂纹,严重时会造成烂边或掉块. The causes of crack in the curl of CSP hot rolled plate in Lianyuan Iron and Steel Co. Ltd. were studied by means of optical microscope, scanning electron microscopy, transmission electron microscopy and energy spectrum analysis.The results showed that the deep flaw on the surface of continuous casting slab was the crack Origin, the slab corner overcooling lead to austenite grain boundary AlN small precipitation, aggravating the sensitivity of the slab on the crack.Column after finishing rolling mill rolling, slab surface transverse cracks Expanded hot rolled coil jagged cracks, can cause bad edge or dropped pieces.