连铸板坯表面夹渣缺陷的成因及控制

Causes and Control of Slag Inclusion Defects on Continuous Casting Slab Surface

对连铸生产的板坯表面夹渣缺陷的产生原因进行了对比研究。结果表明,夹渣缺陷主要由连铸过程中结晶器卷渣造成的。通过采取防止水口面氧化、减少结晶器液面波动、防止浸入式水口堵塞、选择合理的水口浸入深度、优化保护渣和覆盖剂性能、合理控制拉速、减小结晶器振幅、选择合适的结晶器水量、优化职工操作等措施,最终使夹渣率由3.9%降至1.5%,取得良好的控制效果。

The causes of slag inclusion defects on slab surface produced by continuous casting were studied.The results show that the slag inclusion defects are mainly caused by mould slag entrainment during continuous casting.By adopting to prevent the nozzle surface oxidation,reduce mold level fluctuation and prevent the submerged nozzle clogging,choose reasonable nozzle immersion depth,optimization of protecting slag and covering agent performance,reasonable control of drawing speed,reduce the crystallizer amplitude,choosing the right and the optimization of the worker of the crystallizer water measures,eventually make slag rate from 3.9% to 1.5%,achieve good control effect.