METHOD FOR REFINING A METAL COATING ON A STEEL STRIP

A method for improving a metal coating on a steel strip or a steel sheet or plate. The coating is melted to a maximum temperature above the melting temperature of the material of the coating by inductive heating performed by at least one induction coil and subsequently cooled to a quenching temperat...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	OBERHOFFER, HELMUT, THOMAS, RAINER, OPPER, MARKUS, MATUSCH, DIRK, SAUER, REINER
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY 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
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Beschreibung
Zusammenfassung:	A method for improving a metal coating on a steel strip or a steel sheet or plate. The coating is melted to a maximum temperature above the melting temperature of the material of the coating by inductive heating performed by at least one induction coil and subsequently cooled to a quenching temperature, below the melting temperature, in a cooling device. In order to improve the corrosion stability of the coating, even in the case of thin coating layers, the coating is kept at a temperature above the melting temperature during a holding time and the holding time is adapted to the maximum temperature and the thickness of the coating by moving at least one of the induction coils with respect to the cooling device, in order to melt the coating completely over its entire thickness to the boundary layer with the steel strip.