Method for eliminating peeling of IF steel edge in hot continuous rolling process

Abstract

The invention provides a method for eliminating peeling of IF steel edge in a hot continuous rolling process, belonging to the technical field of steel rolling. The technical process comprises the following steps: detecting the phase change temperature of IF steel in the hot rolling process by adopting a physical simulation method; properly increasing the temperature of a tapping side of the furnace by a heating furnace by adopting micro positive pressure control to ensure that the transverse temperature difference of a plate blank is controlled to be not higher than 20 DEG C; regulating time sequence of rolling and descaling to avoid temperature of the strip edge from falling into a coexistence region; using an upstream spray pattern to replace side jet for cleaning descaling water of rough rolling and fine rolling to prevent the strip edge from water washing; and taking the temperature of the fine rolling inlet as a control target, which is controlled to be between 1,030 and 1,060 DEG C. The invention has the advantages of simple method and high efficiency. By using the method, the defect of edge peeling of the IF steel can be easily solved under a condition of not influencing the production situation and the performance of the IF steel.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a method for eliminating edge warping of IF steel in the hot continuous rolling process, which is suitable for eliminating linear warping caused by edge cracking of strip steel in the rolling process of hot-rolled IF steel . Background technique [0002] As an excellent steel for deep drawing, IF steel is generally used by users in fields requiring high formability such as automobiles and home appliances, and users have higher and higher requirements for its surface. The linear warping that appears on the edge of the strip after hot rolling is a very common and serious defect that affects its surface quality. This defect is highly hereditary. If the strip with this defect continues to Cold rolling will cause spots on the surface of the cold-rolled strip, and in severe cases, the strip will be broken, and these warped skins will also cause scratches on the cold-...

AI Technical Summary

Problems solved by technology

[0005] For the setting of the finish rolling entrance temperature, most literatures and manufacturers only regard the rough rolling exit temperature as a process control point, but think that the finish rolling entrance temperature will not affect the edge warping. The high-pressure water descaling before finishing rolling after rolling has a great influence on the temperature at the entrance of finishing rolling. If the temperature is not controlled, edge warping defects will also occur on the strip in the finishing rolling section.

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