Because of the issues of continuous erosion of a 60 t BOF tapping hole

easily occurring local serious etching led to irregular shape of tapping hole

tapping flow diffusing and slagging down

during steelmaking process the aim content of elements can't be controlled led to production interruption

service life of tapping hole less than that of furnace body and frequently changing tapping hole. By the measures including improving the tapping hole assemble process

optimizing the tapping changing process

adjusting slag damming process and maintaining the tapping hole

the amount of slagging down decreases

the yield of alloy Si and Mn increase respectively from original 76. 75% and 90. 04% to 84. 26% and 91. 16%

the BOF end [O

]

decreases from 645 x 10

-6

to 463 x 10

-6

and the service life of tapping hole increases obviously from original 200 ~ 300 heats to 700 ~ 800 heats

and t

he times of change tapping hole per month decreases from 6 ~ 8 to 2 ~ 3.