A Method for Controlling Beading Defects in the Middle of Cold-rolled Strip Steel

Abstract

The invention belongs to the technical field of steel rolling and discloses a method for controlling the bulging defect of the middle of cold-rolling strip steel. The method comprises the steps that in the production process of hot rolling, based on the thickness of the strip steel, the thickness tolerance of the strip steel is controlled, and the thickness uniformity, in the width direction, of the strip steel is improved; based on the width of the strip steel, the convexity degree of the strip steel is controlled, and the co-plate difference of the strip steel is reduced; in the cold rollingproduction process, the reduction rate of a first pass of cold rolling is controlled, and the flow uniformity of metal on the surface of the strip steel is maintained; and based on the thickness of astrip steel finished product, the coiling tension generated after degreasing is controlled, and the buckling deformation of the strip steel is reduced. By means of the method, the bulging defect of the middle of the cold-rolling strip steel can be eliminated.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for controlling beading defects in the middle of cold-rolled strip steel. Background technique [0002] The "stringing" defect is the bulging phenomenon formed on the surface of the steel coil during the coiling process of the strip steel. It is macroscopically manifested as a band-shaped uplift of the cold-rolled coil along the rolling direction, which causes additional waves to be generated in the defect area of ​​the strip steel uncoiling, and the surface of the strip steel The formation of local instability will lead to uneven coloring, which will significantly affect the appearance quality and performance of the steel plate, resulting in product degradation or even scrapping. In the existing production process for cold-rolled strip steel, due to technological limitations, it is easy to have central beading defects. Contents of the invention [0003] The inv...

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Problems solved by technology

[0002] The "stringing" defect is the bulging phenomenon formed on the surface of the steel coil during the coiling process of the strip steel. It is macroscopically manifested as a band-shaped uplift of the cold-rolled coil along the rolling direction, which causes additional waves to be generated in the defect area of ​​the strip steel uncoiling, and the surface of the strip steel Form local instability and uneven coloring will occur, which will significantly affect the appearance quality and performance of the steel plate, resulting in product degradation or even scrapping

In the existing production process for cold-rolled strip steel, due to process limitations, it is easy to have central beading defects

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