Steelmaking flow sheet for GCrl5 bearing steel is 80 t top and bottom combined blowing converter-LF refi- ning-VD-180 mm x 220 mm CC process. The effect of CaO-SiO

2

-Al

2

0

3

-CaF

2

-MgO refining slag series with basicity 3 ~ 8 on metallurgy quality of high quality GCrl5 bearing steel (/% ： 0. 95 ~ 1. 05C

0. 15 ~0. 35Si

0. 25 ~0. 45Mn

1. 40 ~ 1

65Cr

W0. 025P

W0. 025S

WO.001 2[ 0

]

) is studied. Commercial production results show that with using 5. 8 basicity refining slag (/% : 50 ~55CaO

6 ~ 12SiO

2

15A1

2

O

3

10CaF

2

W0. 5FeO

W8MgO)

it is available to decrease the oxygen content and inclusions in steel

the oxygen content in GCrl

5 bearing steel is (5 ~9) x 10

-6

average oxygen content is 5. 6 x 10

-6

the sulphur content in steel is 0. 005% ~ 0. 009%

and the rating of inclusion in steel is 0 ~ 0. 5.