High-strength steel sheet, high-strength hot-dip galvanized steel sheet, high-strength hot-dip aluminized steel sheet, and high-strength electro-galvanized steel sheet, and their manufacturing methods
A high-strength steel plate and a manufacturing method technology, which are applied in the field of high-yield-ratio steel plates, can solve the problems of reduced formability of steel plates, cracks, and the inability to simply achieve thin-walled steel plates, and achieve the effects of high utilization value and improved fuel efficiency.
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[0165] 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 obtained slabs were made into the following various steel plates under the conditions shown in Table 2.
[0166] That is, after hot rolling, at Ac 1 Phase transition point above +20°C and Ac 1 Annealing below the transformation point +120°C, after cold rolling, in Ac 1 Above the phase transition point and Ac 1 Annealing is performed below the transformation point +100°C. Then, high-strength cold-rolled steel sheet (CR) is obtained, and further galvanized to obtain hot-dip galvanized steel sheet (GI), alloyed hot-dip galvanized steel sheet (GA), hot-dip aluminum-steel sheet (Al) and electro-galvanized steel sheet (EG )Wait.
[0167] It should be noted that, as a hot-dip galvanizing bath, a zinc bath containing 0.19% by mass of Al was used for a hot-dip galvanized steel sheet (GI), and a ...
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