某热轧板卷公司生产的Q345B钢板卷在开卷时,发现整卷在其轧制表面上都存在很严重的轧制缺陷，缺陷主要以唇裂、皱褶和孔洞为主。通过对带有缺陷的薄板进行化学成分、夹杂物、扫描电镜断口及显微组织分析,并结合轧钢生产现场工艺情况,对热轧板卷表面缺陷的形成原因进行了分析。结果表明: 轧辊辊面氧化膜剥落是热轧板卷表面缺陷产生的主要原因; 氧化膜剥落使得辊面变得相当粗糙，导致了皱褶缺陷的形成，而孔洞是由皱褶发展而成的，唇裂则主要是由于氧化铁皮的压入而形成的折叠缺陷。

During opening of a hot-rolling Q345B steel strip, severe surface defects which are mainly holes, folding and cracks, were found on one side of the whole strip. Formation reasons of these surface defects of the strip were analyzed by chemical compositions analysis, inclusions examination, fracture analysis and microstructure observation using SEM. The results show that the surface defects were possibly caused by the scaling of oxide on the working rollers. Scaling of the oxide made the surface of the working rollers became coarse, which resulted in the formation of the folding defect. Then folding developed into hole and the impressing of the oxide resulted in the formation of the crack.