High-strength steel plate with excellent formability and stability of material properties, and method for manufacturing same
A technology of high-strength steel plate and manufacturing method, applied in chemical instruments and methods, manufacturing tools, hot-dip plating process, etc., can solve the problems of insufficient total elongation, difficulty in ensuring strength, etc., and achieve hole expandability and material stability. Excellent effect, improved fuel efficiency, and high utility value
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[0102] Steel having the composition shown in Table 1 with the balance consisting of Fe and unavoidable impurities was melted in a converter and cast into slabs by continuous casting. The resulting cast sheet was heated to 1250° C. and hot rolled to a plate thickness of 3.2 mm. The hot rolling was performed under conditions of a finish rolling temperature of 900°C, a post-rolling cooling rate of 10°C / sec, and a coiling temperature of 600°C. After pickling the hot-rolled steel sheets, they were cold-rolled to a thickness of 1.4 mm, and then annealed under the manufacturing conditions shown in Table 2. Part of it is then subjected to hot-dip galvanizing treatment, hot-dip galvanizing treatment, alloying treatment of the hot-dip galvanized layer, and hot-dip aluminum treatment. No.35, 38, and 44 are hot-dip galvanized steel sheets, No.36, 39, 41-43, and 47 are alloyed hot-dip galvanized steel sheets, and No.37, 40, and 46 are hot-dip aluminized steel sheets.
[0103] The hot-dip...
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