对304J1含铜不锈钢热轧板表面的裂纹缺陷进行了微观形貌及微区成分观察和检测,并调查了现场生产工艺参数。结合检测试验结果和现场工艺调查分析,认为裂纹主要是由于铸坯中成分偏析及加热过程中铜选择性富集氧化造成的。通过优化调整冶炼、连铸和热轧工艺参数,缺陷发生率大幅降低,缺陷得到有效控制。 The microstructure and microstructure composition of the cracks on the surface of 304J1 copper-containing stainless steel were observed and examined. The process parameters were also investigated. According to the results of test and field investigation, it is considered that the crack is mainly caused by the segregation of components in the slab and the selective enrichment and oxidation of copper during the heating process. By optimizing the smelting, continuous casting and hot rolling process parameters, the incidence of defects is greatly reduced and defects are effectively controlled.