| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for refining molten steel by which a secondary refining for molten steel is simply performed inexpensively without using a complicated refractory structure, and the efficiency of the refining can drastically be improved. SOLUTION: In the molten steel circulating type refining apparatus, the inner diameter Du of a riser pipe 2 and the inner diameter Dd of a descending pipe 3 satsfy the following formula (1): 1.4≤Du/Dd≤3 ...(1). When the inner diameter Di of the bottom part in a vacuum vessel 1, the inner diameter Du of the riser pipe and the inner diameter Dd of the descending pipe satisfy the following formula (2), it is desirable since the mixture promotion effect of the molten steel in a ladle 5 can be improved in more stably: 1.1≤Di/(Du+Dd)≤1.8 ...(2). COPYRIGHT: (C)2010,JPO&INPIT |
