Abstract：In recent years, quality objection about coldrolling strip mostly fell into surface defects. The surface defect patterns of coldrolling cracking changes complicatedly and the reasons are various also. Various processes, including steelmaking, hotrolling, coldrolling, can work cracks by directly or indirectly form. The surface coldrolling cracks were analysed comprehensively of low carbon killed steel for Tangshan Jianlong Industrial Co. Ltd’s Cold Rolling Mill. Through strengthening the defect detection and analyzing reasons, the roots of defects are identified correctly. Only by taking corresponding measures were product quality improved.
