STEEL SHEET GALVANIZED WITH ZINC ALLOY EXCELLENT IN WELDABILITY AND FORMABILITY AND ITS PRODUCTION

PURPOSE:To stably and easily produce a steel sheet galvanized with Zn alloy excellent in weldability and formability with certainty by forming a plating layer of Zn alloy containing specific percentages of alkali metal elements, Al, Mg, and Fe on a steel sheet and specifying the content of ZnO on th...

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Bibliographische Detailangaben
Hauptverfasser:	NUMAKURA YUKIO, NAKAYAMA MOTOHIRO
Format:	Patent
Sprache:	eng
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 INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To stably and easily produce a steel sheet galvanized with Zn alloy excellent in weldability and formability with certainty by forming a plating layer of Zn alloy containing specific percentages of alkali metal elements, Al, Mg, and Fe on a steel sheet and specifying the content of ZnO on the surface of the above plating layer. CONSTITUTION:A steel sheet is plated with a hot dip galvanizing bath having a composition consisting of 50-5000ppm alkali metal elements (one or >=2 elements among Li, K, Na, etc.), 0.05-0.5wt.% Al, 0.1-3wt.% Mg, and the balance Zn. Subsequently, coating weight is controlled and the above steel sheet is heated at about 480-700 deg.C for about 3-120sec to undergo alloying treatment, by which Fe concentration in the plating layer is regulated to 7-18wt.%. Further, the above steel sheet is treated at about 350-700 deg.C for