Steel sheet, coated steel sheet, and method for manufacturing hot-rolled steel sheet, method for manufacturing cold-rolled full-hard steel sheet, method for manufacturing thin steel sheet, and method for manufacturing coated steel sheet
A manufacturing method and technology of hot-rolled steel sheets, applied to chemical instruments and methods, manufacturing tools, heat treatment furnaces, etc., can solve problems such as reduced workability, and achieve the effects of excellent coating properties, improved fuel efficiency, and improved collision safety
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[0149] Hereinafter, the present invention will be specifically described based on examples. The technical scope of the present invention is not limited to the following examples.
[0150]Steel with the composition shown in Table 1 (the balance being Fe and unavoidable impurities) was melted in a vacuum melting furnace in a laboratory, and rolled to form a billet. These billets were heated to 1200° C., rough-rolled, and then hot-rolled under the conditions shown in Table 2 to obtain hot-rolled steel sheets (HR). Next, a part was cold-rolled to 1.4 mm to make a cold-rolled full-hard steel sheet (CR). The obtained hot-rolled steel sheets and cold-rolled full-hard steel sheets were subjected to annealing. Next, a galvanizing treatment and, if necessary, a galvanizing treatment are performed to produce a galvanized steel sheet (GI) and a galvanized steel sheet (GA). Annealing was carried out in the laboratory under the conditions shown in Table 2 using a heat treatment and plati...
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