Slab rolling method

Abstract

The invention discloses a slab rolling method comprising the following phases: sizing rolling, broadside rolling and finishing rolling; before sizing rolling, whether the difference between a rolling mill barrel length and a blank length is bigger than 0.5m or not is determined; if the difference is <=0.5m, the broadside rolling is directly carried out; if the difference is bigger than 0.5m, the sizing rolling is carried out; when the sizing rolling is carried out, whether the blank broadside rolling ratio is smaller than 1.4 or not is determined; if the blank broadside rolling ratio is smaller than 1.4, a thin-side broadside rolling mode is carried out; if the blank broadside rolling ratio is not smaller than 1.4, a Mizushima Automatic Plan View Pattern Control System (MAS) mode is carried out; the slab rolling method can reduce cutting loss, thus improving rolling yield.

Description

technical field [0001] The invention relates to the technical field of planar shape control of a thick plate rolling mill, in particular to a thick plate rolling method. Background technique [0002] In the finishing process of conventional production of thick plates, the losses caused by cutting heads, tails and edges account for about half of the total finished product loss rate. In order to reduce this loss, it is extremely important to make the planar shape of the sheet rectangular and to control the planar shape of the sheet. The commonly used methods are thick side widening rolling method, dog bone rolling method, thin side widening rolling method, vertical roll edging method, undercut back rolling method and tail rolling method, etc. [0003] Mizushima Automatic Plan View Pattern Control System (MAS) is a planar shape control technology developed by Mizushima Heavy Plate Works of Kawasaki Steel Corporation in Japan and started to be used in production in 1978. The c...

AI Technical Summary

Problems solved by technology

[0009] The current thick plate rolling usually adopts the thick side widening rolling method. In actual production, due to the large change in the variety and specification of the medium and thick plate, the roll shape and thickness width change greatly, resulting in some cases, the thick side rolling method is not suitable for It cannot improve the plane shape, but instead increases the unevenness of the plane shape, especially in the narrow plate with a relatively small expansion ratio in the forming stage, it will cause uneven width of the concave edge of the steel plate width, and in the expansion rolling stage, when the expansion ratio is large, The head and tail of the steel plate produce a large fishtail shape, which causes unfavorable factors such as rolling and straightening of the steel plate and shearing amount, and increases the cutting loss

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