A cold-rolled hot-dip galvanized steel sheet with excellent bending properties and a manufacturing method thereof
A manufacturing method and hot-dip aluminum technology are applied to cold-rolled hot-dip aluminum-zinc steel sheets, hot-dip aluminum-zinc steel sheets, cold-rolled hot-dip aluminum-zinc steel sheets and their manufacturing fields, and can solve the bending of cold-rolled hot-dip aluminum-zinc steel sheets. The problems of poor performance and high manufacturing cost can achieve the effect of low switching difficulty, low implementation investment, and stable production.
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[0048] The present invention will be further described below in conjunction with Embodiments 1 to 6. .
[0049] Table 1 is the chemical composition (by weight percent) of the cold-rolled hard steel sheet of the embodiment of the present invention, and the balance is Fe and inevitable impurities.
[0050] The chemical composition of table 1 embodiment steel of the present invention, unit: weight percentage
[0051]
[0052]
[0053] Through converter smelting, continuous casting slabs meeting the required chemical composition are obtained, with a thickness of 210 to 240 mm, a width of 800 to 1300 mm, and a length of 5000 to 10000 mm.
[0054] The continuous casting slab is heated to 1150-1200 ℃ by a heating furnace and then hot rolled. The hot rolling is a two-stage rolling process. The rough rolling is 5-pass continuous rolling, and the finishing rolling is 7-pass continuous rolling. The temperature at the end of rolling is 900°C to 920°C; the laminar cooling adopts po...
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