Abstract: In viewing of the distribution and morphology characteristics of the hole defect of nonoriented electrical steel in Maanshan Iron and Steel Co., Ltd., the causes of the defect were analyzed by micro analysis of the defect sample and the production data. Combined with the production process of hot rolling, by avoiding the impact of strip steel on the guide and reducing the nodule formation on the guide, the pressing of foreign bodies in hot coiling could be effectively suppressed, thus reducing the formation of hole defect in cold rolling process.

Key words: hole defect, non-oriented electrical steel, surface quality