| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method where cleanliness of molten steel when replacing a ladle can be improved without causing reduction in operability and increase in cost. SOLUTION: A molten steel is poured in such a manner that the amount W<SB>O</SB>of molten steel in a tundish in a stationary state maintains≥6 times a molten steel feed speed Q [ton/min] to a continuous casting machine. From the point of time at which the molten steel height in the ladle reaches≤50 cm, the pouring is finished in such a manner that the molten steel feed speed from the ladle to the tundish satisfies inequality (1): Q/h<0.5, and, when starting pouring into the ladle, and when a refractory nozzle is immersed into the tundish again, the refractory nozzle immersion height is secured so as to be≥100 mm, further, the molten steel amount Wmin in the tundish at the time of the immersion is made to satisfy inequality (2): Wmin>3×Qm, and also, the differenceΔW between it and the molten steel amount in a stationary state is made to satisfy inequality (3):ΔW>3×Qm. COPYRIGHT: (C)2009,JPO&INPIT
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