Method for manufacturing hot-dip galvanized steel sheet
A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., can solve the problems of reduced productivity, decreased coating adhesion, decreased coating alloying speed, etc.
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[0104] A steel having a composition containing elements shown in Table 1 and the remainder consisting of Fe and unavoidable impurities was melted in a converter and cast into a slab by a continuous casting method. The obtained slab was heated at 1240° C. for 60 minutes in a heating furnace, hot-rolled, and coiled at 550° C. to obtain a hot-rolled steel sheet. Next, pickling was performed on the hot-rolled steel sheet to remove black scale, and cold rolling was performed to obtain a cold-rolled steel sheet with a thickness of 1.4 mm. The cold-rolled steel sheet was subjected to the first annealing step, the Fe film formation step, and the second annealing step under the conditions shown in Table 2 and Table 3. It should be noted that in Table 2 and Table 3, the holding time of the first annealing step represents the time for holding the steel sheet in the temperature range of 650°C to 900°C, and the holding time of the second annealing step represents the holding time of the st...
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