| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of rash flaw and breakout in slab short sides upon twin casting. SOLUTION: Regarding the continuous casting method, using immersion nozzles for discharging molten steel 7 in both the short side directions of a mold 1, and one and the same mold vibration apparatus, single casting or twin casting is performed. Upon single casting for a slab with a thickness of 200 to 300 mm and a width of 1,100 to 2,300 mm, to discharged molten steel from the respective discharge holes of the dipping nozzles 3, and upon twin casting for a slab with the above thickness and a width of 500 to 1,100 mm under the conditions satisfying V≥-0.58×ΔT+61.6(V: molten steel discharge flow velocity (cm/sec) from the discharge holes, andΔT: the degree of superheat in the molten steel (°C)), at least to discharged molten steel from the discharge holes on the side between the immersion nozzles 3a, 3b and a partition 2, electromagnetic force by static magnetic fields in which magnetic field intensity at the central part of the thickness respectively is 1,500 to 4,000 G is applied. The improvement of quality and casting efficiency and stabilization of operation are made possible. COPYRIGHT: (C)2008,JPO&INPIT
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