A kind of manufacturing method of hot-dip galvanized steel sheet
A manufacturing method, hot-dip aluminum technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of surface transverse creases, large spangles on the coating, etc.
Active Publication Date: 2021-05-07
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
[0011] The purpose of the present invention is to provide a method for manufacturing hot-dip galvanized steel sheets, which mainly solves the problems of surface transverse creases and large spangles on the surface of hot-dip galvanized steel sheets with a thickness of 2.0 to 2.5 mm in the prior art. technical problem, the inventive method has improved the product quality of the hot-dip galvanized steel sheet of 2.0~2.5mm thickness, has reduced the production cost of the hot-dip galvanized steel sheet of 2.0~2.5mm thickness
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[0046] The present invention will be further described below in conjunction with Examples 1-4, as shown in Tables 1-4. Table 1 shows the chemical composition (by weight percentage) of the substrate of the hot-dip galvalume steel sheet according to the embodiment of the present invention, and the rest is Fe and unavoidable impurities.
[0047] Table 1 The chemical composition of the substrate of the hot-dip galvanized steel sheet according to the embodiment of the present invention, unit: weight percent.
[0048]
[0049]
[0050] According to the requirements of the material composition design of the present invention, the molten steel meeting the required chemical composition is obtained by adopting converter melting, the molten steel is vacuum decarburized and degassed in the RH furnace, the pure degassing time of the molten steel in the RH furnace is greater than 8 minutes, and the molten steel is blown by Ar The continuous casting slab is obtained by the protective c...
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Abstract
The invention discloses a method for manufacturing a hot-dip galvalume steel sheet, which mainly solves the technical problems in the prior art that the hot-dip galvanized steel sheet with a thickness of 2.0-2.5 mm is prone to surface crease defects and large spangles in the coating . A method for manufacturing a hot-dip galvanized steel sheet provided by the present invention includes the following steps: performing continuous casting of molten steel to obtain a continuous casting slab; the continuous casting slab is heated to 1180-1240° C. in a heating furnace and then hot-rolled. Hot-rolling is a two-stage rolling process. Hot-rolled steel coils are obtained from coils at 400-600°C; After cooling, flattening, and coiling, the finished hot-dip galvanized steel sheet with a thickness of 2.0-2.5mm is obtained. Elongation A after breaking of the 2.0-2.5mm hot-dip galvanized steel sheet of the present invention 80mm It is 32-38%, and there is no transverse crease on the surface. The hot-dip galvanized steel sheet of the invention is used in industries such as household appliances.
Description
technical field [0001] The invention relates to a method for manufacturing a hot-dip galvanized steel sheet, in particular to a method for manufacturing a hot-dip galvanized steel sheet with a thickness of 2.0-2.5 mm, and belongs to the technical field of iron-based alloys. Background technique [0002] Due to its excellent corrosion resistance, heat resistance and oxidation resistance, paintability, processability and economy, hot-dip aluminum-zinc alloy coated steel sheets are widely used in the fields of construction, household appliances, industrial instruments and automobiles. . [0003] The patent publication date is November 3, 2004, the publication number is CN1542158A, and the patent document titled "Hot-Dip Al-Zn Alloy Steel Sheet and Its Manufacturing Method" discloses a conventional Al-Zn alloy-coated steel sheet and its manufacturing process , does not involve crease quality control, hot rolling process, cold rolling process, galvanizing process issues. [000...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D1/26C21D8/02C23C2/06C23C2/40
CPCC21D1/26C21D8/0226C21D8/0236C21D8/0273C21D2211/003C21D2211/005C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/06C23C2/06C23C2/40
Inventor 徐勇王银军包祥明黄海孙永旭魏宝民
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD