High-strength steel plate and manufacturing method thereof
A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, coatings, furnace types, etc., can solve the problem that the processability is not comparable to that of polygonal ferrite, it is difficult to achieve high strength and processability at the same time, and the processability cannot be obtained And other problems, to achieve the effect of excellent extension flange, excellent ductility, and high use value
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[0123] (Example 1)
[0124] The steel slab obtained by smelting the steel with the composition shown in Table 1 is heated to 1200°C, then hot-finished at 870°C, the resulting hot-rolled steel sheet is coiled at 650°C, and then the hot-rolled steel sheet is pickled After that, cold rolling was performed at a rolling rate (rolling rate) of 65% to produce a cold-rolled steel sheet having a thickness of 1.2 mm. The obtained cold-rolled steel sheet was heat-treated under the conditions shown in Table 2.
[0125] 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.
[0126] In addition, some cold-rolled steel sheets are subjected to hot-dip galvanizing or galvanizing. Among them, the hot-dip galvanizing treatment is based on the bath temperature of 463℃ and the adhesion amount (single surface) of 50g / m 2 The conditions for implementing double-sided plating. In...
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[0151] (Example 2)
[0152] The slabs obtained by smelting the steel types a, b, c, d, and e shown in Table 4 were heated to 1200°C, and then finally rolled at 870°C. The resulting hot-rolled steel sheet was coiled at 650°C, and then After pickling the hot-rolled steel sheet, it was cold-rolled at a rolling rate (rolling rate) of 65% to produce a cold-rolled steel sheet with a thickness of 1.2 mm. The obtained cold-rolled steel sheet was heat-treated under the conditions shown in Table 5. Then, the steel sheet after the heat treatment was subjected to pass rolling with a rolling rate (elongation) of 0.5%. In addition, A in Table 4 3 The point is obtained by the above-mentioned formula, and the Ms point in Table 5 is the martensitic transformation start temperature of each steel type measured by the Fomasta test. In addition, in Table 5, invention example 1 is an invention example in which the first temperature range (cooling stop temperature) is lower than Ms-100°C, and inventi...
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