Abstract: In order to solve the problems of 120 t converter tapping hole sleeve brick such as low service life, long tapping time and large temperature drop in the early stage, serious diffuser and secondary oxidation in the later period, poor slag-damming effect and serious rephosphorization in Maanshan Iron & Steel Co., Ltd., new material, new technology and new process have been adopted in the replacement, operation and maintenance of tapping hole brick. The results indicated that the service life of tapping hole brick was extended, the ratio of the optimist tapping time between 5min50s and 4 min was 73.6%, the temperature dropped reduced by 12℃, times of slag rephosphorization accident dropped from seven times to under three times per month.

Key words: tapping hole, sleeve brick, using technical, effect