Method for reducing pinchers of cold-rolled strip coil

Abstract

The invention discloses a method for improving the quality of cold-rolled strip products, and particularly relates to the method for reducing the pinchers of a cold-rolled strip coil. The technical scheme is that: the method comprises the following steps of: when the transverse thickness difference of the cold-rolled strip coil is more than or equal to 15 mu m, exchanging the head and the tail of strip steel for re-coiling, increasing the setting of a cooling fan by 8 to 10 percent when the re-coiled strip steel is fed into a continuous annealing furnace for annealing, and reducing the setting of the coiling tension of the annealed strip steel at a continuous annealing furnace outlet section by 10 to 11 percent; when the transverse thickness difference of the cold-rolled strip coil is less than 15 mu m, reducing the setting of the tension at a continuous annealing furnace process section by 7 to 15 percent, and reducing the setting of the coiling tension of the annealed strip steel at an outlet section by 8 to 15 percent; and when a coiling length is more than 500m, eliminating the coiling tension at the outlet section, manually and transversely moving a coiling position by 1 to 2mm, performing the re-coiling, controlling a re-coiling acceleration gradient not to be more than a process speed, and performing the next acceleration after the stable running of 10 seconds.

Description

technical field [0001] The invention relates to a method for improving the quality of cold-rolled steel strip products, in particular to a method for reducing folding defects of cold-rolled steel coils. Background technique [0002] Cold-rolled steel coils generally use a horizontal continuous annealing furnace to complete recrystallization annealing. The horizontal continuous annealing furnace is divided into three parts: the entrance section, the process section and the exit section. The coiling operation is completed in the entrance section, the recrystallization annealing process is completed in the process section, and the annealed steel coil is recoiled in the exit section. [0003] After the steel coil is cold-rolled, there is stress concentration, and there is a thickness difference in the transverse direction of the rolling direction. In the national standard, it is required that the thickness difference of the lateral thickness difference within the width of 150m...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned defects, the technical problem to be solved by the present invention is to provide a method for reducing the fold defects of cold-rolled steel coils by changing the parameters of the continuous annealing process under the conditions of the existing continuous annealing equipment and annealing process, so as to solve the problem. The problem of increased scrap rate caused by the continuous annealing process of cold-rolled strip steel