STEEL PLATE FOR MOLTEN ZINC BATH EQUIPMENT EXCELLENT IN RESISTANCE TO MOLTEN ZINC CORROSION AND RESISTANCE TO ZINC-INDUCED CRACKING AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a steel plate for molten zinc bath equipment excellent in resistance to molten zinc corrosion and resistance to zinc-induced cracking, which has strength, toughness and weldability required for a steel for a welded structure, has excellent corrosion resistance in ter...

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Hauptverfasser:	KUSUNOKI TAKASHI, SAITO NAOKI, KODAMA MASAYUKI, TAMAKI TAI, KATO KENJI, TANAKA MUTSUTO, ITO MINORU, OKAYAMA YUTAKA
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a steel plate for molten zinc bath equipment excellent in resistance to molten zinc corrosion and resistance to zinc-induced cracking, which has strength, toughness and weldability required for a steel for a welded structure, has excellent corrosion resistance in terms of corrosion caused by molten zinc and is less prone to cracking induced by molten zinc, and to provide a method for producing the same.SOLUTION: A steel plate for molten zinc bath equipment comprises, by mass, 0.10-0.30% C, ≤0.05% Si, 0.20-2.0% Mn, ≤0.015% P, ≤0.030% S, ≤0.070% Al, and the balance being Fe and unavoidable impurities. In a cross section of a plate thickness parallel to the rolling direction and perpendicular to a plate surface, bainite structure accounts for 70% or more by area fraction of metallic structures within a surface layer extending from the plate surface to t/4 of the plate thickness direction.