Abstract：n order to solve the slide surface breakout problem in medium slab caster of tangsteel, the causes of slide surface breakout in process of quick replacement of submerged nozzle are analysed. Concluded that is concerned with the leakage of tundish argon pipeline, surface oxidized of submerged nozzle, slow speed of hydraulic cylinder as well as unreasonable operation. Through the improved measures including optimizing the layout of argon pipeline, increasing the speed of hydraulic cylinder, improving oxidation resistance of slide surface of submerged nozzle, optimizing preheating operation and quick replacement operation of submerged nozzle, increasing the argon flow rate, etc. By means of corresponding measures being taken,the average slide surface breakout times per year was decreased from 4 to 0.
2019, Vol. 38 