The effect of three refining processes i. e. BOF-common carburetant-LF-RH-CC

BOF-common carburet- ant-LF-CC and BOF-low nitrogen carburetant-LF-CC on cleanliness of steel is compared by analysis on change of total oxygen content T [O

]

nitrogen content [ N

]

and micro inclusions in high carbon steel SWRH82B during steelmaking process. Results indicate that the effect of type of carburetant adding during BOF tapping on increment of nitrogen content in steel is obvious

and the lower nitrogen content in steel (0. 002 3% N at end LF) could be got without RH degassing treatment by using low nitrogen carburetant (0. 040 0% N) ； using common carburetant (0. 500 0% N) leads to increase the nitrogen content in steel (end LF 0. 005 3% N)

RH end N% in steel decreases to 0. 003 3% ； whether the RH process is used or not has no no

table influence on ； and based on using low nitrogen carburetant without RH treatment

the total oxygen content and nitrogen content in billet could be controlled respectively to ≤20 x 10

-6

and 41 x 10

-6

.