PURPOSE: To obtain a cast slab cleaned at high grade by pouring the cleaned molten steel using a vertical tundish into a mold for continuous casting.
CONSTITUTION: The tundish arranged with component adjusting mechanism 20, inclusion aggregating mechanism 30, temp. adjusting mechanism 40 and killing and straightening mechanism 50 from the upper part to the lower part of the tundish body 10 is used, and the molten steel 1 poured from a ladle 5 through a long nozzle 2 is poured into the tundish as the descending stream. As for a long nozzle 2, in which the bottom part is closed and plural spouting holes 6 having 0-45° downward angle are arranged at the side surface, is used. By this constitution, since the molten steel 1 in the ladle 5 is poured into a forcedly stirring zone as the uniform stream, the aggregation and growth, and the floating-up and separation of the inclusion are promoted, and the molten steel 1 cleaned at the high grade is poured into the mold 4 for continuous casting. Further, the contamination caused by the air is prevented and the components and the temp. are controlled in the high accuracy.
NAKAJIMA YOSHIO
AKIYAMA KOJI
YAMAMOTO ATSUO
