METHOD FOR PRODUCING HOT-DIP GALVANIZED STEEL SHEET

Provided is a method for manufacturing a hot-dip galvanized steel sheet with which it is possible to achieve high coating adhesiveness and good coating appearance, even in the case where a hot-dip galvanizing treatment is performed on a steel sheet containing Si in an amount of 0.2 mass% or more.Whe...

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Bibliographische Detailangaben
Hauptverfasser:	AOYAMA, Mai, TAKAHASHI, Hideyuki, WATANABE, Maiko, TAKEDA, Gentaro, EHASHI, Tatsuya
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Provided is a method for manufacturing a hot-dip galvanized steel sheet with which it is possible to achieve high coating adhesiveness and good coating appearance, even in the case where a hot-dip galvanizing treatment is performed on a steel sheet containing Si in an amount of 0.2 mass% or more.When a hot-dip galvanizing treatment is performed on a steel sheet containing Si in an amount of 0.2 mass% or more by using a continuous hot-dip galvanizing apparatus including an annealing furnace in which a heating zone, a soaking zone, and a cooling zone are arranged in this order, a snout adjacent to the cooling zone, and hot-dip galvanizing equipment, a humidified nitrogen-hydrogen gas mixture containing moisture in such a manner that expression (1) below is satisfied is supplied into a region on the downstream side of the soaking zone, gas nozzles are arranged over the entire perimeter of an inner wall of the snout, nitrogen gas or a nitrogen-hydrogen gas mixture is supplied through the gas nozzles downward along the inner wall, and the dew point in the snout is controlled to be - 50°C to -35°C: 158