Abstract: In view of the low self opening rate of 60 t ladle after VD process in a steel plant, the influencing factors such as hot repair operation, nozzle brick material, steel grade, ladle temperature, molten steel holding time and storage time of molten steel in ladle were analyzed. Due to the long storage time of molten steel in ladle after VD refining, the sintering layer of stuffing sand was thick and the self opening rate of ladle was low.Through the optimization and improvement of the material of the stuffing sand and the comparative test, the self opening rate of the ladle of the improved stuffing sand after VD process reached 99.38 %.

Key words: stuffing sand, texture of material, ladle, self opening rate