PLATED STEEL MATERIAL AND STEEL PIPE HAVING HIGH CORROSION RESISTANCE AND EXCELLENT WORKABILITY, AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a hot-dip galvanized steel material which has high corrosion resistance and has excellent plating adhesion upon working by optimizing the structure of a plating layer and thickness of a lower layer in a two-step plating process where the surface of the steel is subje...

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Bibliographische Detailangaben
Hauptverfasser:	TERADA YOSHIO, KAYAZONO YOSHIHISA, MIMURA HIROYUKI, HONDA KAZUHIKO, FUNATSU SHINICHI, YAMADA WATARU, TSUNODA HARUHIKO, SUEHIRO ATSUO, YASUDA KAZUO
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:	PROBLEM TO BE SOLVED: To provide a hot-dip galvanized steel material which has high corrosion resistance and has excellent plating adhesion upon working by optimizing the structure of a plating layer and thickness of a lower layer in a two-step plating process where the surface of the steel is subjected to hot-dip galvanizing, and is thereafter subjected to hot-dip Zn-Al-Mg alloy plating, and to provide a method for producing the hot-dip galvanized steel material.SOLUTION: The surface of the steel material includes: an Fe-Al alloy layer having a thickness of 0.01-1.5 μm as a lower layer; an alloy layer as an intermediate layer formed on the Fe-Al alloy layer and comprising, by mass%, 4-20% Al, 0.1-15% Fe, 0.1-5% Mg and the balance Zn with inevitable impurities; and an alloy layer as an upper layer formed on the intermediate layer and comprising 4-20% Al, 0.1-5% Mg and the balance Zn with inevitable impurities.