High-strength steel plate and manufacturing method thereof
A high-strength steel sheet and a manufacturing method technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problem of insufficient workability, difficulty in achieving high strength and workability, and poor workability of polygonal ferrite, etc. problem, to achieve the effect of excellent stretch flangeability, high utility value, and excellent ductility
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[0183] The slab obtained by melting the steel with the composition shown in Table 1 was heated at 1200°C, and the 3 Finish hot rolling at 870°C above the temperature, coil the hot-rolled steel sheet under the conditions shown in Table 2, then pickle the hot-rolled steel sheet, and then cold-roll it at a rolling ratio (reduction ratio) of 65%. , Made of plate thickness: 1.2mm cold-rolled steel plate. The obtained cold-rolled steel sheets were annealed in the ferrite-austenite two-phase domain or the austenite single-phase domain under the conditions shown in Table 2. Note that the cooling stop temperature: T in Table 2 refers to the temperature at which the cooling of the steel sheet is stopped when the steel sheet is cooled from the annealing temperature.
[0184] In addition, alloying hot-dip galvanizing was performed on a part of the cold-rolled steel sheet (sample No. 15). Here, the hot-dip galvanizing treatment is based on the plating bath temperature: 463°C, and the wei...
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