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针对首钢生产SPA-H钢热轧卷中密集出现独立细线缺陷、独立翘皮缺陷、细线翘皮共生缺陷和浅坑缺陷等表面质量问题展开机理研究.通过使用金相显微镜、扫描电子显微镜和能谱仪观察了缺陷的形貌和微区成分,认为细线、翘皮和细线翘皮共生缺陷的形成与两个因素紧密相关,一是表层含硅/铬氧化物的氧化铁皮,二是与钢基体紧密接触的氧化铁皮内部的铜富集.研究表明,浅坑发生在精轧过程中,为翘皮等脱落后的碎屑在板面机械摩擦碾压划擦形成.“,”The formation mechanism of surface defects,including the independent linear defect,independent tarpaulin defect,the mixture of linear and tarpaulin defect,and the shallow pit defect on the hot rolled SPA-H coil in Shougang Company was studied.The morphologies of defects and microstructures were examined using metallographic microscope,scanning electron microscope and energy dispersive spectrometer.It was concluded that the formation of both linear and tarpaulin defects and their mixture should be closely related to the two factors:Oxide scale that contains both silicon oxide and chromium oxide;The copper enrichment in the oxide scale near the steel matrix.The shallow pit results from the debris of broken tarpaulin which was rolled into the steel during the finish rolling.