Production method for reducing length of water gap replacing blank in continuous casting process

Abstract

The invention relates to a production method for reducing the length of a water gap replacing blank in the continuous casting process and aims at providing the production method for reducing the length of the water gap replacing blank in the continuous casting process, meanwhile, a casting blank before water gap replacing is not affected, the cleanliness and the judgment level of the casting blank before water gap replacing are not lowered, and the quality of the casting blank and the high-grade casting blank proportion are improved. The production method comprises the following steps that the target pulling rate in the continuous casting process is set, the target pulling speed is reduced to the pulling rate when the blank is used for water gap replacing, the opening degree of a stopper rod is adjusted, and the liquid level of a crystallizer rises to the target water gap replacing liquid level, the pulling rate when the blank is used for water gap replacing is maintained, and the casting blank meets the fixed size requirement; after the fixed size is reached, the stopper rod is closed and kept closed, a water gap is replaced, the stopper rod is opened, and the pulling rate when the blank is used for water gap replacing is increased to the target pulling rate; the opening degree of the stopper rod is adjusted again, the liquid level of the crystallizer reaches the target liquid level, the water gap replacing work is finished, and the water gap replacing blank is cut off offline.

Description

technical field [0001] The invention relates to the field of steelmaking in the metallurgical industry, in particular to a production method suitable for reducing the length of a billet for changing water in a continuous casting process. Background technique [0002] The operation of changing the water port in the continuous casting process changes the flow state of the molten steel in the mold, making the flow of the molten steel in an unstable state, and the slab in an unstable state is likely to cause quality problems and product defects in the subsequent steel rolling process. It also does not meet the needs of enterprises to reduce costs, increase efficiency, and improve quality. The number of slabs with water changes accounts for about 10-30% of the whole unsteady slab, and the probability of defects such as slag rolling is about 4 to 5 times that of normal slabs, resulting in lower grades of slabs and poor cleanliness, which is not conducive to high quality The produ...

AI Technical Summary

Problems solved by technology

[0002] The operation of changing the water port in the continuous casting process changes the flow state of the molten steel in the mold, making the flow of the molten steel in an unstable state, and the slab in an unstable state is likely to cause quality problems and product defects in the subsequent steel rolling process. It also does not meet the needs of enterprises to reduce costs, increase efficiency, and improve quality

The number of slabs with water changes accounts for about 10-30% of the whole unsteady slab, and the probability of defects such as slag rolling is about 4 to 5 times that of normal slabs, resulting in lower grades of slabs and poor cleanliness, which is not conducive to high quality The production of clean steel platforms is one of the main reasons for the generation of unqualified slabs, and it is also a common problem and technical difficulty faced by various steelmaking production departments

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