针对某厂新建多模式连续铸轧生产线热轧带钢表面几种典型缺陷，通过扫面电镜及能谱分析等方法对缺陷的表面及截面进行分析。结果表明：样品缺陷类型分别为氧化铁皮异常、硅酸盐夹杂、铝酸盐夹杂、卷渣。针对氧化铁皮异常问题，可调整隧道炉炉辊转速，消除炉辊与带钢间的速度差，加密除磷高压水水嘴；针对硅酸盐及铝酸盐夹杂缺陷，应主要从控制炼钢终点氧含量、控制喂铝量、优化钢包吹氩工艺、合理调节氩气流量、适当延长弱搅拌时间、增加连铸钢包浇余等方面进行工艺改进；针对卷渣问题可通过稳定控制塞棒动作、减少结晶器液位波动、减少拉速波动等方面进行改进。

In view of several typical defects on the surface of hot rolled strip in a new multi-mode continuous casting rolling production line of a factory, the surface and section of defects were analyzed by scanning electron microscope and energy spectrum analysis. The results show that the types of defects are abnormal iron oxide scale, silicate inclusion, aluminate inclusion and slag entrapment. Aiming at the problem of abnormal iron oxide scale, the rotation speed of furnace roller of tunnel furnace can be adjusted to eliminate the speed difference between furnace roller and strip steel, and the high-pressure water nozzle for phosphorus removal can be increased. In view of the inclusion defects of silicate and aluminate, the process improvement should be carried out mainly from the aspects of controlling the oxygen content at the end of steelmaking, controlling the amount of aluminum feeding, optimizing the ladle argon blowing process, reasonably adjusting the argon flow rate, appropriately prolonging the weak stirring time, and adding the casting residue of continuous casting ladle. The problem of slag entrapment can be improved by controlling the stopper action stably, reducing the fluctuation of mold liquid level and casting speed.