A method for controlling edge cracking of strip steel by crystallization roll shape

Abstract

A method for controlling the edge cracking of strip steel through the roll shape of a crystallizing roll, comprising the steps of discretizing the edge roll shape curve of the original crystallizing roll, the thickness curve of the cast strip, and the thickness curve of the rolled strip, and calculating the center position of the strip steel width direction. Control the thickness reduction ratio of the strip edge area, and obtain the corrected crystallization roll edge roll shape value according to the roll shape optimization variables, etc., and perform curve fitting on the discretized roll shape value to obtain a new The crystallization roll edge roll shape curve. The invention controls the thickness of the edge part of the cast strip by changing the shape of the edge part of the crystallization roll, and controls the width direction of the strip steel during the hot rolling process, especially the thickness reduction ratio of the center region and the edge region, and improves the hot rolling process. The rolling balance in the width direction of the strip solves the defect of the edge crack of the double-roll cast strip, improves the quality of the strip edge, and solves the problems of broken strip and poor production continuity caused by the edge crack defect.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to twin-roll thin strip continuous casting and steel rolling, and more particularly relates to a method for controlling edge cracking of strip steel by crystallization roll shape. Background technique [0002] The twin-roll casting process is to cast the molten steel through a pair of counter-rotating crystallization rolls into a thin cast strip. For strip steel, the hot rolling reduction rate is generally below 70%. The twin-roll casting and rolling production line has a short production process and few production processes, and it is difficult to control the strip rolling. In the production process, it is difficult to solve the problem of edge crack defects. [0003] The control of the edge quality in the prior art focuses on the detection and control of the edge quality of the strip in the traditional hot rolling line or the cold rolling line, and has not yet involved ...

AI Technical Summary

Problems solved by technology

The method of the present invention improves the balance of the thickness reduction ratio in the width direction of the strip steel by controlling the thickness of the edge of the cast strip and the difference between the thickness reduction ratio of the central area of ​​the strip steel and the edge area during the hot rolling process, thereby effectively solving the problem of The problem of strip edge crack defects in twin-roll casting and rolling process is solved

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