Through the practice show that

it can be seen the production of bearing steel

the converter tapping temperature ≥1650℃

tapping oxygen ≤300 x 10

-6

and 18 kg/t slag can achieve 50% desulfurization efficiency in the tapping process. At the same time

the mode of u slag retaining cone + slide plate slag retaining" is adopted in converter tapping to reduce sulfur by another 0. 000 5% ； the mode of aluminum adding in BOF tapping + LF refining to deoxidize with ferrosilicon powder and controlling the binary basicity of slag to be 5 ~ 6 can achieve more than 50% desulfurization effect and stabilize the casting performance to get finished product sulfur content ≤0.0015% .