| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To carry out floating separation of an inclusion surely and effectively compared with the prior art using a tundish equipped with a weir having a wall part and an eaves-shaped part horizontally projected from the upper end of the wall part. <P>SOLUTION: A steel cast slab is continuously cast using the tundish 1 equipped with the weir 7 with a rectangular outline that has the wall part 8 extended upward between a molten steel pouring part 5 and molten steel outflow ports 6 while surrounding the molten steel pouring part 5 from four directions, and the eaves-shaped part 9 horizontally projected facing the molten steel pouring part side from the upper end of the wall part and has at least one notch, and controlling pouring of molten steel into the tundish so that the pouring flow rate Q of the molten steel 11 into the tundish and the initial speed U of molten steel pouring flow to the tundish in relation to the upper opening area S1 of the weir, the opening area S2 of the notch, the volume V of a space surrounded by the weir, the length X of long sides of the rectangular outline of the weir, and the length Y of short sides of the rectangular outline of the weir satisfy the relationship of the following expression (1): 0.03≤(Q×U)×[(S1+S2)/V]×(X/Y)≤0.35. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
