| 摘要 |
PURPOSE:To avoid over-stirring in a final solidified area and to prevent segregation in inner part of a cast slab by reducing the intensity of magnetic field in accordance with the falling of molten metal pressure in the above area at the time of electromagnetic stirring in the final solidified area of the molten metal in a continuous casting. CONSTITUTION:The prescribed quantity of molten steel 12 is poured in a water cooled mold 10 and the cast slab forming solidified shell 14 is drawn at the prescribed velocity. Then, the magnetic field is impressed on the molten steel 12 of non-solidifying area 16 and the molten steel 12 in the vicinity of crater end 18 is stirred, to avoid the enclosure of the molten steel 12 with low melting point. At the time of once stopping the drawing at the end stage of casting, the cast slab becomes to over-cooling state and the crater end 18 position is risen and the molten steel 12 pressure in this range is fallen. Then, after reopening the drawing in accordance with the molten steel 12 pressure at the crater end 18, the impressed intensity of magnetic field is reduced. In this way, the over-stirring in the finish solidified range is avoided, and the segregation in the inner part of cast slab is prevented. |
