| 摘要 |
PURPOSE:To obtain a billet which is clean in the front layer part and has extremely little central segregation by casting continuously a molten steel while using the electromagnetic stirrer in such a manner that the molten steel flows upward on the inside wall surface of a casting mold and flows in the transverse direction of the billet in a secondary cooling zone. CONSTITUTION:The electromagnetic stirrer 5 in the casting mold is so operated that the molten steel 1 flows upward on the inside wall surface of the mold 3 and the in-roll type electromagnetic stirrer 7 is so operated that the molten steel 1 flows in the transverse direction of the billet in the secondary cooling zone in a continuous casting machine for slab which obtains the bloom by pouring the molten steel 1 from a tundish 2 into the mold 3, supporting and drawing out a solidified shell layer 4 formed as a result of cooling by means of rolls 6 and subjecting the shell layer to secondary cooling. The increase in the size of the inclusion and the floating of the inclusion and foam are thus accelerated and the billet having good quality is obtd. |
