| abstract |
(57) [Abstract] [PROBLEMS] A hot-rolled steel sheet having an iron oxide layer is used as a steel sheet, and a hot-dip galvanized steel sheet excellent in plating appearance and plating adhesion is prevented from being damaged in an annealing furnace. , Providing a manufacturing method and manufacturing equipment of hot-dip galvanized steel sheet that can be manufactured by an economically excellent method. A method of manufacturing a hot-dip galvanized steel sheet using a hot-rolled steel sheet having an iron oxide layer on the surface of the steel sheet, the annealing furnace comprising a heating zone and a cooling zone attached to a hot dip galvanizing facility. A heating zone that can control the atmosphere independently is provided inside, and the ventilation rate of the atmosphere gas in the heating zone is 5 cycle / h. Under the above conditions, the hot-rolled steel sheet is passed through an annealing furnace, reduced, annealed, immersed in a hot-dip galvanizing bath, and the method for producing the hot-dip galvanized steel sheet is applied, and the heating zone is sealed. The manufacturing facility including rolls and separators. |