PRODUCTION OF GALVANIZED STEEL SHEET

PURPOSE: To provide a producing method suitable in the case a high P-contg. steel sheet is galvannealed by a continuous hot dip galvanizing line as for a method for producing a hot dip galvanized steel. CONSTITUTION: A steel contg., by weight, 0.03 to 0.15% P is hot dip galvanized, and after that, b...

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Hauptverfasser:	YAMASHITA MASAAKI, INAGAKI JUNICHI, NOIDE SHUNSAKU, NAKAMURA SEIJI, OZAKI JUNICHI
Format:	Patent
Sprache:	eng
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 INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY 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:	PURPOSE: To provide a producing method suitable in the case a high P-contg. steel sheet is galvannealed by a continuous hot dip galvanizing line as for a method for producing a hot dip galvanized steel. CONSTITUTION: A steel contg., by weight, 0.03 to 0.15% P is hot dip galvanized, and after that, by induction heating, heating alloying treatment is executed at >=5kHz frequency. Since the steel itself is directly subjected to the induction heating, the diffusion of Fe atoms on the surface of the steel into Fe-Al-Zn intermetallic compounds is promoted, by which the alloying reaction is accelerated.