Rolling process for eliminating edge crack defect of cold-rolled strip steel
A technology of cold-rolled strip steel and process, which is applied in the field of rolling process to eliminate edge crack defects of cold-rolled strip steel, can solve the problems of stable production of rolling mills, impact on product delivery quality, edge cracks, etc., and improve product manufacturing capacity Effect
Inactive Publication Date: 2021-06-04
XINJIANG BAYI IRON & STEEL
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Problems solved by technology
[0002] During the rolling of 0.27-0.35*1250mm specifications, Bayi Iron and Steel Co., Ltd. had edge crack defects during the rolling process, which not only affected the delivery quality of the products, but also affected the stable production of the rolling mill.
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[0015] The steel coil number is L2027305800, the thickness of the hot-rolled slab is 220mm, the width is 1234mm, and the thickness of the rolling exit is 2.19mm. Adjust the temperature system for hot rolling, control the final rolling temperature to 875°, and the coiling temperature to be greater than 643°. The width of cold-rolled pickling trimming is 16mm, the overlap of disc shears is 0.35mm, and the side clearance of disc shears is 0.3mm. The effective concentration of the emulsion A system of the cold rolling mill is controlled at 2.64%, the effective concentration of the emulsion B system is controlled at 1.7%, and the iron powder content is 264ppm. Optimize cold rolling mill reduction ratio distribution, bending force and tension setting. Strictly control the reduction of the first pass and the finished product pass. The first pass controls the lateral flow of metal, controls the grain structure of the edge, increases the reduction of the finished product pass, and red...
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Abstract
The invention discloses a rolling process for eliminating the edge crack defect of cold-rolled strip steel. The rolling process is characterized in that the rolling process is used for strip steel with the thickness of less than 0.35 mm, and comprises the following steps: 1) a hot rolling temperature regulation process is adopted, the final rolling temperature is controlled to 870 DEG C, and the coiling temperature is greater than 640 DEG C; 2) the effective concentration of an emulsion A system of a cold rolling mill unit is controlled between 2.5% and 3.0%, the effective concentration of an emulsion B system is controlled between 1.5% and 2.0%, and the content of iron powder needs to be controlled to be 400 ppm or below; 3) distribution of the reduction rate of a cold rolling mill and setting of roll bending force and tension are performed; and 4) the shape of a cold rolling hard strip steel plate is controlled according to micro double-side waves. The rolling process is mainly used for the rolling technology for eliminating the edge crack defect of the cold-rolled strip steel with the thickness less than 0.35 mm, and the product manufacturing capacity of a cold-rolling and acid-rolling combined rolling unit can be greatly improved.
Description
technical field [0001] The invention relates to a rolling process for eliminating edge crack defects of cold-rolled strip steel. Background technique [0002] During the rolling of 0.27-0.35*1250mm specifications, Bayi Iron and Steel Co., Ltd. encountered edge crack defects during the rolling process, which not only affected the delivery quality of the products, but also affected the stable production of the rolling mill. Contents of the invention [0003] The purpose of the present invention is to provide a rolling process for eliminating edge crack defects of cold-rolled strip steel, which can ensure product quality and reduce economic losses of enterprises. [0004] A rolling process for eliminating edge crack defects of cold-rolled strip steel to achieve the above purpose. The rolling process is used for strip steel with a thickness of less than 0.35 mm, and includes the following steps: 1) Adjust the temperature system process for hot rolling, and control the final ro...
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IPC IPC(8): B21B1/28B21B1/22
CPCB21B1/28B21B1/22B21B2001/225
Inventor 张永钢宋维兆成鹏远
Owner XINJIANG BAYI IRON & STEEL