Method for controlling strip shape of CSP hot-rolling extremely-thin color-coating base material

Abstract

The invention relates to a method for controlling the strip shape of CSP hot-rolling extremely-thin color-coating base material. The method comprises the following steps that the convexity and the wedge degree of the CSP hot-rolling extremely-thin color-coating base material are selected, wherein the convexity is 40+ / -20 microns or 45+ / -20 microns or 50+ / -20 microns, and the wedge degree is less than or equal to 20 microns; high / concave points of the transverse section of strip steel are evaluated, wherein evaluation is conducted through thickness difference values of the strip steel on the transverse section perpendicular to the rolling direction and in the section with the boundary + / -200 mm away from two sides of the middle point; outside the section with the boundary + / -200 mm away from the middle point, local high / concave points which are higher / lower than the outline datum line of a strip steel board are evaluated. The control ability for the strip shape of a unit can be fully excavated, and production stability of the thin color-coating base material is greatly improved. The invention further discloses a technology for controlling indexes of the strip shape of the ma steel hot-rolling CSP color-coating base material. The technical requirements for indexes of the convexity and the wedge degree of the color-coating base material of different thickness specifications are definite, technological innovation is conducted on the local high (concave) evaluation mode and the technical requirements of the transverse section of the strip steel, outline quality of the strip steel board is measured more scientifically and accurately, and therefore the defects of middle ridges and middle narrow waves of the color-coating base material are overcome, quality of color-coating products is improved, and quality loss of the products is reduced.

Description

technical field [0001] The invention relates to a method for controlling the shape of a CSP hot-rolled ultra-thin color-coated base material. Background technique [0002] The production of color-coated sheets needs to go through four production processes: hot rolling, pickling and cold rolling, galvanizing, and color coating. The extremely thin color-coated sheets have very high requirements on the shape of the sheets, and slight shape defects in raw materials will cause color-coated sheets Defects such as missed coating and uneven coating. Especially the original plate shape of the hot-rolled raw material has a great influence on the final shape quality of the color-coated plate. The hot-rolled CSP production line of Maanshan Iron and Steel belongs to the compact continuous hot rolling production line. Due to the insufficient production process system of the ultra-thin products of Maanshan Iron and Steel’s hot-rolled CSP production line, the quality control of the strip ...

AI Technical Summary

Problems solved by technology

Due to the insufficient production process system of the ultra-thin products of Maanshan Iron and Steel’s hot-rolled CSP production line, the quality control of the strip steel profile is unstable, especially the local height (concave) control of the strip steel cross section is unstable, resulting in ribbing and narrowness in the middle of the color coating base material. Severe wave defect

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