When the bled of the slab surface are extended during rolling, the slab surface is delaminated and form the surface up-warping when the gas in the bled escape along the gap of delamination.

• 对该类缺陷的成因进行了分析和推理，认为是铸坯表层气泡在轧制延伸过程中造成钢板分层并在表层逸出导致开裂形成翘皮。