| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a continuously cast slab capable of further improving the surface quality and the inside quality of a slab. SOLUTION: In the method for producing a continuously cast slab where, to a continuous casting mold in which an electromagnetic stirring device is installed at the upper part and a magnetostatic field generating device is installed at the lower part, molten steel is fed via an immersion nozzle provided with two downward discharge holes as feed ports for molten steel, and further, the surface of the molten steel in the continuous casting mold is controlled so as to be located in the range from the center of a coil core to the upper end of the core in the electromagnetic stirring device, the ratio between stirring force by the electromagnetic stirring device and magnetic field intensity by the magnetostatic field generating device on the surface of the molten steel satisfies inequality (1): F/Bm>0.5, and also, magnetic field intensity by the magnetostatic field generating device in the position of each discharge hole satisfies inequality (2): Bt/Q>350. COPYRIGHT: (C)2009,JPO&INPIT
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