| 摘要 |
PURPOSE:To improve the contact efficiency between an inert gas and molten steel and to form a good-quality ingot having no component segregation, etc. by blowing an inert gas to a submerged gate provided in a flow passage for the molten steel and adjusting the temp. of the molten metal. CONSTITUTION:The submerged gate 5 is provided on the down stream side of the position where a pouring pipe 2 of a tundish 1 is inserted in such a manner as to contact with the base of the tundish 1. The inert gas is blown from a porous plug 6 into the molten steel M under passage through the space part 4 of the gate 5 and the blowing rate of the inert gas is adjusted to decrease the temp. of the molten steel M down to the prescribed temp. The molten steel M which is decreased in the temp. flows successively from a refractory wall 3b toward the down stream. The inert gas blown into the space part 4 stagnates for a while in the space part 4 and contributes substantially with the temp. decrease of the molten steel M by contacting efficiently with the molten steel M in the space part 4 and thereafter the gas flows successively upward from the front and rear refractory walls 3a, 3b. The contact time of the molten metal M and the inert gas is therefore considerably extended and the cooling effect is improved. |
