| 摘要 |
PURPOSE:To reduce impurity segregated at center part of a continuously slab and to produce the cast slab having high quality by giving rotating magnetic field rotating toward reverse direction to rotating direction of rolls for light squeeze at crater end part of the cast slab in the case of executing light rolling reduction to the cast slab. CONSTITUTION:In the continuously cast slab 30 drawn from a mold in a continuous casting apparatus, non-solidified molten metal 34 at inner part of solidified shell 32 exists and the light squeeze is executed to the cast slab by many rolls 16 of light squeeze device 10 and the cast slab is cooled by cooling water from spray nozzles and bent toward horizontal direction at a little part of the non-solidified molten metal while increasing thickness of the solidified shell 32. A magnetic field generators 22, 22 are arranged at the part of crater end 36 in the cast slab 30, to generate the rotating magnetic field rotating toward reverse direction to the rotating direction of the rolls 16. By action of this magnetic field, the non-solidified molten metal near the crater end is ascended to the mold direction, and as the molten metal, in which the impurity, such as P, S, are concentrated, is returned back to the upper part, the segregation of the impurity in the finish solidified part at the crater end part is reduced and the cast slab having excellent quality can be produced. |
