High-strength plated steel sheet having excellent plating properties, workability, and delayed fracture resistance, and method for producing same
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[0122]Slabs having the component composition given in Table 1, the balance being iron and inevitable impurities, were heated to 1250° C., and were hot-rolled down to 2.4 mm at a finish rolling temperature of 900° C., followed by coiling at the temperature given in Table 2.
[0123]Some of the examples, i.e. Nos. 26 to 28, 37 to 39 and 41, were placed thereafter in a ceramic fiber heat-insulating apparatus, where the temperature was kept under the conditions given in Table 2. The keeping time at a temperature of 500° C. or higher was measured using a thermocouple attached to the outer periphery of the coil.
[0124]Each hot-rolled steel sheet thus obtained was then pickled under the conditions below, and was thereafter cold-rolled at a cold rolling ratio of 50%. The sheet thickness after cold rolling was 1.2 mm.
[0125]The pickling solution was 10% hydrochloric acid, the temperature was 82° C. and the pickling time as given in Table 2.
[0126]Next, annealing (oxidation, reduction) and cooling ...
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