Tundish with slag-avoiding function under protective atmosphere and using method

Abstract

The invention discloses a tundish with a slag-avoiding function under a protective atmosphere and a using method. The tundish comprises a body, an upper cover plate is arranged at the top of the body, a slag-avoiding device is installed at the position of the upper cover plate, a long nozzle is arranged in the slag-avoiding device in a sleeved mode, the bottom end of the slag-avoiding device extends to the position below the slag adding height, and a turbulence suppressor is arranged in the position, under the slag-avoiding device, of the upper surface of a bottom plate of the body. Argon blowing holes are formed in the two ends of the upper cover plate of the tundish, argon is continuously blown to the tundish through the argon blowing holes and the slag-avoiding device, air is completely exhausted, the tundish is kept in a micro-positive-pressure argon environment, and the protective atmosphere is formed; and secondary oxidation of air on molten steel is prevented. Besides, the molten steel can entrain argon in the pouring process, the dead zone volume in the tundish is remarkably reduced, the buoyancy of argon bubbles is beneficial to collision, growth and removal of inclusion particles, the floating bubbles can capture the inclusion particles and carry the inclusion particles to float upwards together, the floating speed of the fine inclusion particles is increased, inclusions in the molten steel are removed, the service life of the tundish is prolonged, the purity of the molten steel is improved, and the casting blank quality is improved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting of thick slabs, and in particular relates to a tundish with a slag avoiding function under a protective atmosphere and a use method thereof. Background technique [0002] The tundish is an important metallurgical reactor connecting the ladle and the crystallizer. It can store a certain amount of molten steel during the ladle change and ensure continuous pouring, improve the flow conditions of the molten steel, prolong the residence time of the molten steel, and remove the molten steel as much as possible. Inclusions; It can also control the temperature of molten steel and maintain an appropriate superheat. Whether it is for the smooth progress of continuous casting operations or to improve the quality of molten steel, the role of the tundish is very important. [0003] In recent years, domestic and foreign metallurgists have carried out a lot of work on the optimization of the tundish. ...

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