Method for improving pickling surface quality of strip steel
A technology of surface quality and steel acid, which is applied in the field of improving the surface quality of strip steel pickling, and can solve the problems of difficult surface quality of hot-rolled steel strip pickling.
Inactive Publication Date: 2020-08-14
SHOUGANG CORPORATION +1
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Problems solved by technology
[0004] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a method for improving the surface quality of strip pickling, so as to solve the surface quality problem caused by the difficulty of pickling the hot-rolled steel strip in the prior art
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[0031] The present invention will be described in detail below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be presented more clearly. Those skilled in the art should understand that these specific implementations and examples are used to illustrate the present invention, not to limit the present invention.
[0032] Throughout the specification, unless otherwise specified, terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, this specification shall take precedence.
[0033] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.
[0034] The ...
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The invention discloses a method for improving the pickling surface quality of strip steel. The method comprises the steps that molten steel is smelted to obtain a plate blank; the plate blank is sequentially subjected to heating, rough rolling and finish rolling, and strip steel is obtained; the strip steel is coiled to obtain a hot-rolled coil; and the hot-rolled coil is sequentially subjected to primary cooling and secondary cooling, wherein the secondary cooling is carried out by hoisting the hot-rolled coil subjected to primary cooling into a water cooling tank filled with industrial circulating water, in the secondary cooling, the water inlet temperature is 580-600 DEG C, the water outlet temperature is 80-100 DEG C, and the cooling rate is 10-20 DEG C / s. The water cooling tank is adopted for cooling, thin and uniformly coiled oxidized scale can be obtained, no oxidized scale is left on the surface of the strip steel after acid pickling, and the surface quality is high. The costis low and the popularization is easy.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a method for improving the pickling surface quality of strip steel. Background technique [0002] During the process of slab heating, rough rolling and finishing rolling, the upper and lower surfaces of the strip steel will be oxidized to form oxide scales, which can firmly cover the surface of the strip steel. According to the needs of use, the steel strip may be subjected to cold rolling or hot galvanizing processes, but before the cold rolling or hot galvanizing process, the oxide scale on the surface of the strip steel must be removed by pickling to ensure the quality of cold rolling and hot galvanizing. Various surface quality defects such as "black belt", gray surface color after pickling, pickling color difference and cross-folding may appear after pickling of strip steel. [0003] In the production process, pickling of strip steel is difficult, and the surface colo...
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Login to View More IPC IPC(8): C21D8/02C21D11/00
CPCC21D8/0205C21D8/0247C21D11/005
Inventor 张亮亮于洋李晓军马壮罗宪王林高小丽王畅巫雪松王泽鹏李高峰张栋吕利鸽陈斌
Owner SHOUGANG CORPORATION