High-strength hot-dip galvanized steel sheet having excellent moldability and shape fixability, and method for manufacturing same
A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in the direction of hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., which can solve the problems of reduced formability, not necessarily high absolute value of tensile flanging performance, and variable springback. Achieve the effect of excellent formability and shapeability
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[0086] Example
[0087] The steel of the component composition shown in Table 1 was smelted in a converter and continuously casted to produce a slab (in Table 1, N is an inevitable impurity). After heating these steel slabs to 1200°C, rough rolling and finish rolling are performed, and the slabs are wound at a winding temperature in the range of 400 to 650°C to produce a hot-rolled sheet having a thickness of 2.3 mm. Next, a part is softened under the conditions of reaching a temperature of 600° C. and a heat treatment time of 5 hours by batch processing, and after pickling, cold rolling to a thickness of 1.4 mm to produce cold rolled steel sheets for annealing. The other part of the steel plate hot-rolled to a thickness of 2.3mm is pickled and then directly subjected to annealing. Annealing is carried out through a continuous hot-dip galvanizing production line under the conditions shown in Tables 2 and 3, and immersed in a plating bath at 460°C to form an adhesion amount of 35...
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