Through practice of bearing steel producing by hot metal pre-desulfurization - 100 t top and bottom combined blown converter - Ar stirring - LF(VD) - billet concasting process

it was obtained that with melting end point carbon between 0.2% and 0.6%

the oxygen content in steel was between 50 X 10

-6

and 150 X 10

-6

by deoxidation in tapping

Ar stirring and LF(VD) refining

the total oxygen content in molten steel in tundish was between 14 x 10

-6

and 16 x 10

-6

and was less than 12 X 10

-6

in cast billet. The analysis results show that it is available to further decrease the total oxygen content in bearing steel by intensifying bath stirring to make steel-slag enough react

and controlling BOF tapping slag amount less than 5 kg/t steel

intensifying Ar stirring

and controlling LF top slag basicity between 2.0 a

nd 2.5 and (FeO) + (MnO) less than 0.5% .