Tundish

Abstract

The invention discloses a pouring box and a method for removing nonmetal impurities by using the same. The pouring box comprises a permanent layer and a working lining arranged on the inner surface of the permanent layer, wherein the bottom of the permanent layer is provided with an air curtain retaining wall which comprises a pouring body and a ventilating plate fixed on the pouring body, an airchamber is formed between the pouring body and the ventilating plate, and the air chamber is communicated with the outside through a ventilating pipe; and before pouring, argon is blown in at small flow first, the flow is controlled to be between 30 and 50 Nl per minute, the pressure is between 0.2 and 0.3 MPa, the pouring with great bags is performed after 1 to 3 minutes, and then the flow is controlled to be between 80 and 150 Nl per minute, and the pressure is controlled to be between 0.3 and 0.6 MPa. The air curtain retaining wall is arranged in the pouring box to blow the argon into molten steel to diffuse into bubbles, adsorb harmful gases of N, O and the like in the molten steel, and reduce the content of the elements in the molten steel; and the bubbles float upwards to play a role of stirring the molten steel and bringing up foreign impurities of oxides, nitrides, sulfides, silicates and the like in the molten steel so that the impurities are adsorbed by the slag charges on the surface of the molten steel, thus the cleanliness of the molten steel is further improved.

Description

technical field [0001] The invention relates to a tundish and a method for removing non-metallic impurities by using the tundish. Background technique [0002] At present, with the popularization and application of high-efficiency continuous casting technology in my country, the number of continuous casting furnaces and the casting speed of continuous casting have been continuously increased, and new problems have emerged. The increase in the amount of steel passing through the tundish and the flow rate of molten steel intensifies the erosion of the refractory by molten steel, and the service life of the slag weir refractory product decreases; the increase in the flow rate of molten steel in the tundish relatively reduces the time for non-metallic inclusions to float up, which has a positive effect on the purification of molten steel Weakened, can not effectively eliminate nozzle nodulation. Generally speaking, the slag retaining wall refractory products tend not to meet th...

AI Technical Summary

Problems solved by technology

The increase in the amount of steel passing through the tundish and the flow rate of molten steel intensifies the erosion of the refractory by molten steel, and the service life of the slag weir refractory product decreases; the increase in the flow rate of molten steel in the tundish relatively reduces the time for non-metallic inclusions to float up, which has a positive effect on the purification of molten steel Weakened, can not effectively eliminate nozzle nodules

Generally speaking, the slag retaining wall refractory products tend not to meet the needs of the development of efficient continuous casting technology

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