Method for controlling head and tail temperature difference of semi-endless rolled overlong casting blank

Abstract

The invention discloses a method for controlling the head and tail temperature difference of a semi-endless rolled overlong casting blank, which is used for solving the problem of poor longitudinal temperature uniformity of an overlong casting blank in a semi-endless rolling process. The invention has the technical scheme that the method comprises the following steps of: making the overlong casting blank enter a soaking pit at a fixed blank pulling speed V0 and making the overlong casting blank advance at a speed V1 not higher than V1max after the tail of the overlong casting blank passes through an accelerated point until the head of the casting blank arrives at the tail end of a heating section, wherein V1 is not less than V0 and not greater than V1max; then making the overlong casting blank advance to the tail end of a blank discharging section at a speed V2; and finally making the overlong casting blank enter a rolling mill at a speed V3 matched with a rolling mill F1 until that the tail of the casting blank leaves the soaking pit. The method has no influence to production rhythms, can also ensure the temperature uniformity of the semi-endless rolled overlong casting blank, greatly reduces the head and tail temperature difference of the overlong casting blank, has the advantages of simple process control and convenient field operation and can further save energy sources.

Description

technical field [0001] The invention relates to a method for producing ultra-thin strip steel by adopting a semi-endless rolling process, in particular to a method for controlling the temperature difference between the head and the tail of a semi-endless rolling ultra-long slab, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] After years of production practice, the thin slab continuous casting and rolling process technology has been continuously developed and improved, and the steel types that can be rolled have been greatly expanded compared with the past, and ultra-thin products can already be produced. like figure 1 As shown, in the conventional short slab rolling process of the existing thin slab continuous casting and rolling process, the cast slab comes out of the continuous casting machine 20 and directly enters the soaking furnace 30 at a relatively high temperature. After the slab passes the acceleration point in the s...

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Problems solved by technology

[0008] Domestic Lianyuan Iron and Steel Co., Ltd., Tangshan Iron and Steel Co., Ltd. and Benxi The commissioning work of endless rolling has not carried out industrial mass production, and key technologies such as temperature uniformity of ultra-long slabs, optimization of rolling process, and optimization of equipment and processes such as flying shears and coiling have not yet been resolved.

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