| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method for molten steel where the improvement effect of slab surface defects and inside defects can be stably obtained while obtaining the lubrication improvement effect of a mold and a solidified shell. SOLUTION: The continuous casting method for molten steel is characterized in that, using a mold formed with long sides and short sides 42 and having a long side length of≥800 mm, an immersion nozzle 10 feeding molten steel into the mold has four or more discharge ports 14 and lies in a plurality of steps to a height direction, and, as the molten steel is fed from the discharge ports 14 into the mold, so as to be directed to the short sides 42, alternating current is made to flow through a solenoid type electromagnetic coil 20 arranged so as to surround the mold or a solenoid type electromagnetic coil 20 buried in a mold wall, thus electromagnetic force is applied to the molten steel in the mold, and casting is performed. The discharge flows 22 of the molten steel from the discharge ports 14 are collided against a flow 21a vertical to the short sides of the mold produced by the electromagnetic force, and the reduction in the speed of the discharge flows is attained, thus the improvement effect of slab surface defects and inside defects can be stably obtained. COPYRIGHT: (C)2008,JPO&INPIT
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