Improvement and control method for sinking of peritectic steel continuous casting billet

Abstract

The invention discloses an improvement and control method for sinking of a peritectic steel continuous casting billet. The method comprises the steps that the contents of Mn, Si and S in peritectic steel molten steel are detected, and calculation is carried out so as to obtain the ratio of Mn / Si to Mn / S; Mn / Si in the peritectic steel molten steel is controlled to be larger than or equal to 3, and Mn / S in the peritectic steel molten steel is controlled to be larger than or equal to 30; a gap between a crystallizer copper pipe and a water jacket and the water flow velocity of cooling water in a crystallizer are obtained, the gap is controlled to be 3-5 mm, and the water flow velocity does not exceed 10 m / s; control is carried out so as to ensure uniform cooling in the crystallizer; and the casting temperature of the molten steel is controlled to be 15-35 DEG C. According to the method, the problem that in the prior art, when casting peritectic steel (Q195) is produced, casting billet sinking is influenced by molten steel components, crystallizer heat transfer, casting powder performance, secondary cooling strength, casting temperature, sleeve pipe centering and the like is solved.

Description

technical field [0001] The invention relates to the technical field of peritectic steel continuous casting slab production, in particular to a method for improving and controlling the depression of peritectic steel continuous casting slab. Background technique [0002] Depression is a common defect in the appearance of continuous casting slabs. It mainly occurs in the mold and is caused by uneven cooling. Its impact on production is mainly reflected in: (1) Potential safety hazards. The ability of static pressure is small, which is easy to bring the risk of steel breakout; (2) hidden danger of quality, the slab sag itself is a kind of appearance defect, and the sag is basically accompanied by subcutaneous cracks, which brings quality risks to the subsequent rolling process and is easy to produce Warped skin will seriously lead to reconnection and cracks, which will have a serious impact on the quality control of the slab. [0003] In the production of peritectic steel (Q195...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned technical problems, the purpose of the present invention is to overcome the problems in the production of cast peritectic steel (Q195) in the prior art, such as molten steel composition, mold heat transfer, mold slag performance, secondary cooling strength, casting temperature and casing alignment. Affect the problem of slab sag, so as to provide a process improvement method to solve the sag problem of peritectic steel (Q195) continuous casting slab, so as to improve the peritectic steel continuous casting slab sag improvement control method to improve the pass rate of slab products

Images