Anti-stripping iron oxide scale structure on surface of hot rolled plate and control process for anti-stripping iron oxide scale structure

Abstract

The invention discloses an anti-stripping iron oxide scale structure on the surface of a hot rolled plate, and a control process for the anti-stripping iron oxide scale structure, and belongs to the technical field of steel rolling. The control process is characterized in that a dual-discharge descaling process is adopted, wherein high-pressure water descaling process is controlled to be higher than or equal to 16 MPa; a high-temperature quick rolling mode is adopted; a front-stage sparse cooling mode is adopted after finish rolling; a rolling temperature is controlled to be lower than 650 DEG C; and finally, the thickness of the iron oxide scale structure on the surface of the hot rolled plate with a thickness of 4-14mm is controlled to be smaller than or equal to 10.8 microns, the proportion of Fe3O4 in the iron oxide scale structure is controlled to be 45%-68%, the proportion of FeO is controlled to be 23%-42%, and the proportion of Fe2O3 is controlled to be 8%-15%.

Description

technical field [0001] The invention relates to the peeling-resistant iron scale structure on the surface of a hot-rolled steel plate and its control technology, and provides a control method for effectively controlling the thickness and structure of the oxide scale on the surface layer of a hot-rolled steel plate. The invention belongs to the technical field of hot-rolled sheet rolling. Background technique [0002] With the continuous development of the automobile industry and machining industry, the requirements for steel materials are also getting higher and higher. While ensuring good comprehensive mechanical properties, hot-rolled steel sheets are also required to have excellent surface quality. This is because steel downstream manufacturers do not pickle hot-rolled steel sheets before cold processing, considering the production cost and processing procedures. Surface treatment, but the corresponding surface quality treatment after cold working, so the degree of scale...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide an anti-peeling scale structure and its control process, which solves the problem that the scale is easy to be damaged during cold forming processes such as stamping or roll forming of hot-rolled steel sheets by end users on automated production lines and stamping units. peeling problem

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