Method for producing cold-rolled steel sheet, cold-rolled steel sheet, and vehicle member
A technology of cold-rolled steel sheets and manufacturing methods, applied in the field of cold-rolled steel sheets, can solve the problems of inability to obtain corrosion resistance, high-strength cold-rolled steel sheets with corrosion resistance, and improvement of corrosion resistance, and achieve corrosion resistance after coating Excellent chemical conversion treatment and corrosion resistance after coating, excellent chemical conversion treatment
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Embodiment 1
[0085] Steel containing C: 0.125% by mass, Si: 1.5% by mass, Mn: 2.6% by mass, P: 0.019% by mass, S: 0.008% by mass, and Al: 0.040% by mass with the balance consisting of Fe and unavoidable impurities Steel raw material (steel billet) is produced by melting and continuous casting through ordinary refining processes such as a converter and degassing treatment. After reheating the slab to a temperature of 1150-1170°C, hot rolling is performed with the final rolling finish temperature set at 850-880°C, coiled at a temperature of 500-550°C, and a sheet thickness of 3 to 4 mm hot-rolled steel sheets, and then these hot-rolled steel sheets are pickled to remove scale, and then cold-rolled to produce cold-rolled steel sheets with a thickness of 1.8 mm. Next, these cold-rolled steel sheets are heated to a soaking temperature of 750 to 780° C., held for 40 to 50 seconds, and then cooled from the above soaking temperature to a cooling stop temperature of 350 to 400° C. at a rate of 20 t...
Embodiment 2
[0107] The steels A to X having the composition shown in Table 3 were smelted and continuously cast through a common refining process such as a converter and degassing treatment to form a billet. These billets were hot-rolled under the hot-rolling conditions shown in Table 4 to produce hot-rolled steel sheets with a thickness of 3 to 4 mm, pickled to remove scale on the surface of the steel sheets, and then cold-rolled to obtain sheet thicknesses of 3 to 4 mm. 1.8mm cold-rolled steel plate. Next, these cold-rolled steel sheets were continuously annealed under the conditions shown in Table 4, pickled under the conditions shown in Table 5, washed with water, dried, and temper rolled with an elongation of 0.7% to obtain No.1~30 cold-rolled steel sheets.
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[0111] Test pieces were cut out from the above-mentioned cold-rolled steel sheets obtained in this way, and the surface coverage of the iron-based oxides on the surface of the steel sheet aft...
Embodiment 3
[0118] Steel containing C: 0.125% by mass, Si: 1.5% by mass, Mn: 2.6% by mass, P: 0.019% by mass, S: 0.008% by mass, and Al: 0.040% by mass with the balance consisting of Fe and unavoidable impurities Smelting and continuous casting are carried out to produce steel raw materials (billets). After reheating the slab to a temperature of 1150-1170°C, hot rolling is performed with the finish rolling temperature set at 850-880°C, and coiling is performed at a temperature of 500-550°C to produce a plate with a thickness of 3~ 4mm hot rolled steel plate. These hot-rolled steel sheets were pickled to remove scale, and then cold-rolled to obtain cold-rolled steel sheets with a thickness of 1.8 mm. Next, these cold-rolled steel sheets are heated to a soaking temperature of 750 to 780° C., held for 40 to 50 seconds, and then cooled from the above soaking temperature to a cooling stop temperature of 350 to 400° C. at a rate of 20 to 30° C. / second. Continuous annealing was maintained for ...
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Abstract
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