According to the 60 t LD-LF-VD-CC production process at Shijiazhuang steel

the average total oxygen content (T[O

]

) in bearing steel GCrl5 decreases obviously by improving a series of process control technology such as tapping at condition of high carbon and low oxygen content in steel

controlling LD tapping slag amount

white slag technology at LF refining station

applying special slagging process for bearing steel

changing argon blowing rate at different refining period and optimizing casting process

the average T[O

]

decreases from original 9. 6 x 10

-6

to 6. 34 x 10

-6

and the heats with T[O

]

≤7 X 10

-6

account for 82. 8% of the total melting heats to get marked effect by improved process.