Device and method for eradicating secondary oxidation of tundish during continuous casting

Abstract

The invention provides a device and a method for eradicating secondary oxidation of a tundish during continuous casting, and relates to the field of metallurgical industry. The device rapidly replaces gas in the tundish before casting, prevents secondary oxidation of the tundish during casting, and ensures that the tundish is completely protected during casting; a tundish sealing cover is adopted to seal the tundish, anaerobic atmosphere manufacture is performed to the tundish through an occlusion system before casting and argon blowing protection is performed during casting, so that the reaction between molten steel in the tundish and air can be effectively reduced. The device has a simple and compact structure, is safe and reliable, and can greatly improve the head blank quality and reduce flaws of casting blanks; the method is relatively simple to operate, the cost is relative low, and the method can be widely applied to the full sealing protection casting of tundishes adopted in domestic enterprises.

Description

technical field [0001] The invention relates to the field of metallurgical industry, in particular to a device and method for preventing secondary oxidation of a tundish in a continuous casting process. Background technique [0002] In recent years, most of the slab continuous casting at home and abroad adopt the traditional tundish sealing method, namely: (1) ladle-tundish connection adopts long nozzle; (2) tundish is covered, and there are long nozzles and Holes for stopper rod insertion and sampling settings; (3) Add covering slag to the surface of molten steel in the tundish. This method of sealing and protection has major deficiencies: (1) The secondary oxidation of molten steel is serious during the first pouring stage, and the first billet must be scrapped or downgraded. Taking Shougang Jingtang and Qiangang as examples, only the first billet will cause Loss of more than 60 tons of steel; (2) Due to the many and large openings in the tundish cover, it is difficult to...

AI Technical Summary

Problems solved by technology

This method of sealing and protection has major deficiencies: (1) The secondary oxidation of molten steel is serious during the first pouring stage, and the first billet must be scrapped or downgraded. Taking Shougang Jingtang and Qiangang as examples, only the first billet will cause Loss of more than 60 tons of steel; (2) Due to the many and large openings in the tundish cover, it is difficult to maintain a non-oxidizing atmosphere in the tundish during the pouring process. ”), molten steel will be oxidized

However, due to the constraints of equipment in domestic iron and steel enterprises, the use of Japanese methods in domestic production requires a major transformation of the tundish, and the cost is relatively high, so it has not been widely used.

Patent CN201010275151.X introduces a method of blowing inert gas into the tundish before pouring to reduce secondary oxidation in the tundish. This method can reduce the content of inclusions in the head blank, but how to prevent secondary oxidation in the subsequent pouring process Oxidation did not propose a solution

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