Fast sprue-replacing casting method and device for continuous irregular blank casting ladle

Abstract

The invention relates to a fast sprue-replacing casting method and a field for continuous irregular blank casting ladle. The invention includes one ladle and a crystallizer and features the ladle with at least two spouts with fast replacing mechanism including upper sliding spout and lower sliding spout and connected to the ladle spout and the immersed spout inserted into the crystallizer. During casting, molten steel flows through sealed channel to avoid secondary oxidation and improve billet quality. The fast spout replacing mechanism regulates the flow rate of molten steel and the level inside the crystallizer to reduce adhesion and leakage. The fast spout replacement can increase the continuous cast crystallizer number, reduce ladle number, lower consumption and raise billet quality.

Description

Technical field [0001] The invention belongs to the technology of continuous metal casting, and particularly relates to a method and device for pouring a special-shaped blank continuous casting tundish. Background technique [0002] The section of the shaped billet is H-shaped, and the mold that receives molten steel during continuous casting is also H-shaped. In order to ensure the uniform flow field and reasonable temperature distribution of the molten steel entering the mold, the current profiled billet continuous casting tundish adopts double sizing nozzles to control the molten steel flow, and the pouring is open, that is, the molten steel in the tundish flows out of the sizing nozzle to form two A separate steel stream is exposed to the air, and then enters the semi-immersion nozzle and is injected into the mold. The device used includes a tundish and two sizing nozzles on the tundish. The bottom of each sizing nozzle corresponds to the semi-immersed nozzle inserted in the...

AI Technical Summary

Problems solved by technology

Due to the use of sizing nozzles for pouring, it is impossible to replace the nozzles online during the pouring process, so the tundish lining has to be replaced frequently

At present, the service life of the sizing nozzle with good material is only 10-15 hours, and the performance and service life of the two sizing nozzles are still uneven, and any damaged one has to be replaced, so the consumption of refractory materials and nozzles is large; replace the sizing The nozzle must stop pouring, the molten steel in the tundish is scrapped, and there are too many scrap steels, which reduces the billet rate; due to the stoppage of pouring and flow interruption, the probability of bonding and steel leakage in the crystallizer increases

[0003] Due to the use of sizing nozzles, during the pouring process, high-temperature molten steel erodes and scours the nozzle holes, and the apertures gradually expand, and the fluctuations in pouring speed cannot be controlled, which is not conducive to production

[0004] Due to the semi-submerged nozzle, the molten steel is exposed to the air again during the pouring process, and the molten steel is oxidized again, which deteriorates the surface and internal quality of the profiled billet

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