Abstract: The peeling defects of 65Mn and 50 cold rolled narrow strip steel were examined in detail by SEM-EDS. Combined with the related quality issues arising from the production process, the main causes of the defects were analyzed, and put forward the improvement measures. After optimization，the defect rate of large peeling was reduced from 1.44 % to 0.015 %，the defect of tiny peeling was eliminated in cold-rolling product，so that the surface quality of products meets the needs of users.

Key words: 65Mn steel, surface quality, peeling defect , SEM