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

Abstract

The present invention relates to continuous metal casting, and is especially special billet casting ladle and its casting process. The present 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 metal continuous casting technology, in particular to a method and a device for pouring into a tundish for continuous casting of special-shaped blanks. Background technique [0002] The cross-section of the shaped billet is H-shaped, and the crystallizer that receives molten steel during continuous casting is also H-shaped. In order to ensure uniform flow field and reasonable temperature distribution of the molten steel entering the crystallizer, the current pouring of the tundish for profiled billet continuous casting adopts double sizing nozzles to control the flow of molten steel. A separate steel stream is exposed to the air before entering the semi-submerged nozzle and injecting into the crystallizer. The device used includes the tundish and two sizing nozzles on the tundish. The bottom of each sizing nozzle corresponds to the semi-immersed nozzle inserted in the crystallizer. The semi-immersed nozzle is supported by ...

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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