Nitrogen-increase-preventing long nozzle for continuous casting ladle

Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a nitrogen-increase-preventing long nozzle for a continuous casting ladle. The nitrogen-increase-preventing long nozzle for the continuous casting ladle comprises a long nozzle body, a ventilation strip, an outer steel shell, an argon connect-in end and a hollow ceramic pipe. The outer steel shell is arranged outside the long nozzle body in a sleeving manner. The ventilation strip is arranged on a long nozzle device. The argon connect-in end is arranged on the steel outer shell. One end of the hollow ceramic pipe penetrates through the steel outer shell and is communicated with the argon connect-in end, and the other end of the hollow ceramic pipe is arranged in the ventilation strip. According to the nitrogen-increase-preventing long nozzle, by arranging the ventilation strip and the hollow ceramic pipe, the sealing performance of the long nozzle body is improved, the argon connect-in end is directly connected with the hollow ceramic pipe, blown-in argon can directly enter the ventilation strip, annular and uniform gas curtains which are equal in width are formed on the inner wall of a bowl part of the long nozzle body, it is guaranteed that air is effectively isolated in the steel casting process, molten steel nitrogen increase is prevented, the purity degree of molten steel is improved, and high quality of the continuously cast billets is guaranteed.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an anti-nitrogen increase nozzle of a continuous casting tundish. Background technique [0002] At present, the competition in the iron and steel industry is fierce and the pressure to survive is high. Major steel mills have stricter controls on molten steel pollution and the quality of continuous casting slabs. The importance of continuous casting in the final process of steel is self-evident. In continuous casting production, when the molten steel flows from the ladle to the tundish, if no protective casting technical measures are taken, the molten steel will inevitably come into contact with the air, resulting in secondary oxidation, which increases the nitrogen content in the molten steel and reduces the of purity. Therefore, strictly controlling the quality of molten steel and continuous casting slabs in the continuous casting process has become the top p...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problem that the ventilation gap and the air channel of the existing argon blowing shroud are set at the top of the shroud, which cannot completely ensure the isolation of air; at the same time, the quality of the refractory mud manually filled is not easy to control, resulting in the existing shroud. Poor air permeability stability, low purity of molten steel, unable to meet the current production needs of steel mills

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