A Thick Plate Rolling Control Method for Eliminating the Edge Defects of Casting Slab

Abstract

A heavy plate rolling control method for removing defects on the edges of a continuous casting bloom comprises the following steps: (1) rotating the continuous casting bloom before pressing upon the continuous casting bloom are taken out of a furnace to enable edges of both lateral sides of the continuous casting bloom to be a top end and a tail end of the continuous casting bloom to be rolled to enter a rolling mill and starting rolling in a forming stage; (2) adopting a rolling method for spreading a heavy plate edge in the last rolling for forming; (3) rotating the continuous casting bloom 90 degrees upon completing rolling in the forming stage to enable edges of the other sides of the continuous casting bloom to revert to the top end and the tail end of the continuous casting bloom to enter the rolling mill and starting rolling in a stage for spreading the heavy plate edge; (4) adopting the rolling method for spreading the heavy plate edge in the last rolling for spreading the heavy plate edge; (5) rotating the continuous casting bloom 90 degrees upon completing the stage for spreading the heavy plate edge in the last rolling for spreading the heavy plate edge and starting rolling in a finishing rolling stage; (6) starting a process for finishing cutting plate. According to this method, the three-time rotating rolling enables defects on the edges of the continuous casting bloom to transfer to a top end part and a tail end part of a heavy plate which are to be cut off and is capable of maintaining an advantage of shape control of the two-time rotating control in the prior art and prevent a finishing steel plate from convexity, thereby reducing amounts of trimming and cutting loss practically.

Description

technical field [0001] The invention relates to a rolling process control technology of a thick plate rolling mill, in particular to a thick plate rolling control method for eliminating edge defects of a slab. Background technique [0002] In the process of thick plate production, crack defects sometimes appear on the edge of the finished steel plate, and the edge of the steel plate containing these defects needs to be cut off, thereby reducing the yield of the product and thus reducing the production efficiency. Therefore, it is necessary to take technical measures to reduce or even eliminate the occurrence of edge defects for sheet and strip edge defects. The specific definition of edge crack defect is: [0003] The edge crack defect of hot-rolled strip refers to the rupture of one or both sides of the edge of the steel plate along the length direction (Di Hongshuang et al., "The Formation Mechanism and Research Status of Edge Defects in Hot-Rolled Strip", Henan Metallurg...

AI Technical Summary

Problems solved by technology

As far as the thick plate rolling process is concerned, these technical measures do not make full use of the process and equipment characteristics of thick plate production

On the other hand, only reducing the steel transfer once will cause the edge problem to be solved, but a new problem of poor plane shape will occur, and the ultimate goal of reducing edge cutting loss will not be achieved.

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