Pneumatic rotational flow upper nozzle base brick for continuous casting tundish

Abstract

The invention discloses a pneumatic rotational flow upper nozzle base brick for continuous casting tundish. The pneumatic rotational flow upper nozzle base brick comprises breathable bricks, an air chamber, an air inlet pipe and a upper nozzle base brick body; the breathable bricks are located on the upper portion of the upper nozzle base brick and arranged in the upper nozzle base brick body; each breathable brick comprises an upper fan-shaped breathable portion and a lower circular-ring-shaped breathable portion; the air chamber is located between the lower circular-ring-shaped breathable portions of the breathable bricks and the upper nozzle base brick body and communicates with the breathable bricks; and one end of the air inlet pipe is connected with the side of the air chamber, and the other end of the air inlet pipe penetrates out of the side face of the upper nozzle base brick body and is connected with an external connecting pipe. According to the pneumatic rotational flow upper nozzle base brick for the continuous casting tundish, argon is blown into the fan-shaped breathable bricks to form an annular air curtain, and inclusion floating and removing are promoted; and meanwhile, molten steel rotational flow channels are formed in spiral gaps of the fan-shaped breathable bricks, rotational flowing of molten steel in a tundish nozzle is achieved, adhesion between inclusion and the inner wall of the tundish nozzle is reduced, collision between small bubbles and the inclusion which enter the tundish nozzle is promoted, and the effects of purifying the molten steel, preventing tundish nozzle blocking and reducing casting blank rim holes are achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy technology, and relates to iron and steel metallurgy continuous casting tundish metallurgical technology, in particular to a pneumatic swirl upper nozzle block for continuous casting tundish. Background technique [0002] In continuous casting production, the tundish nozzle is the channel for continuous casting molten steel to enter the mold from the tundish. It has the functions of preventing secondary oxidation of the tundish injection flow, splashing of molten steel, and slag entrainment on the wall surface of the mold, and improving the flow distribution of the mold. It has significant effects in improving the quality of continuous casting slabs, improving working conditions, stabilizing continuous casting operations and preventing surface defects of slabs. However, in the continuous casting production of some steel types, solid inclusions with high melting points are easy to adhere and deposit on th...

AI Technical Summary

Problems solved by technology

However, due to the continuous adhesion of inclusions on the inner wall of the nozzle during the pouring process, it is very easy to cause blockage of the pores, resulting in uneven air distribution and weakened swirling effect. At the same time, the manufacturing process is complicated and the industrial application is limited.

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