The effect of BOF end [C

]

on end [O

]

and the effect of LF refining slag ( FeO + MnO) and [Als

]

in steel on liquid [O

]

and finished products T[O

]

are analyzed. With using the process measures including controlling BOF end [C

]

0.12%~0.15% and amount of slagging out ＜0.10%

controlling [Als

]

0.015%~0.025% in LF refining

using high basicity tundish shielding agent and special bearing steel GCr15 casting powder

in stable process control condition the T[O

]

in steel ≤10 X 10

-6

and the average T[O

]

is 6. 62 x 10

-6