分析了热轧带钢表面彗星状结疤缺陷的形成过程及分布规律,并对彗星状缺陷的微观组织进行了成分分析。结果表明,机架间使用的直接冷却水蒸气吸附于机架内各处,产生大量的水垢,水垢、锈蚀、机架内灰尘和油脂等物质混合形成机架积垢物,该积垢物在轧制过程中由于机架振动等原因剥落,掉落至带钢表面并随工作辊轧入带钢表面,是形成热轧带钢表面彗星状缺陷的主要原因。 The formation process and distribution of comet - like scarring defects on hot strip were analyzed. The microstructure of comet - like defects was also analyzed. The results show that the direct cooling water vapor used between the racks is adsorbed everywhere in the rack, resulting in a large amount of scale, scale, corrosion, mixing of dust and grease in the rack to form rack scale, Rolling process due to rack vibration and other reasons flaking, falling to the strip surface and roll with the work roll into the strip surface, forming the hot-rolled strip surface comet-shaped flaws the main reason.