MOLTEN ZINC PLATING STEEL SHEET AND PRODUCTION METHOD THEREFOR

Provided is a molten zinc plating steel sheet having more excellent punchability. This molten zinc plating steel sheet has a compositional makeup containing, in mass%, 0.08-0.20% of C, 0.5% or less of Si, 0.8-1.8% of Mn, 0.10% or less of P, 0.030% or less of S, 0.10% or less of Al, and 0.010% or les...

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Bibliographische Detailangaben
Hauptverfasser:	Shigeyuki NABESHIMA, Kana SASAKI, Taro KIZU, Kazunori TAHARA, Noriaki MORIYASU
Format:	Patent
Sprache:	eng ; spa
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 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 TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Provided is a molten zinc plating steel sheet having more excellent punchability. This molten zinc plating steel sheet has a compositional makeup containing, in mass%, 0.08-0.20% of C, 0.5% or less of Si, 0.8-1.8% of Mn, 0.10% or less of P, 0.030% or less of S, 0.10% or less of Al, and 0.010% or less of N, and further, one or more of 0.01-0.3% of Ti, 0.01-0.1% of Nb, and 0.01-1.0% of V so as to satisfy (Ti/48 + Nb/93 + V/51) Ã 12 = 0.07, the remaining portion being Fe and incidental impurities, and has a structure in which: the total area proportion of a ferrite phase and a tempered veinite phase is 95% or more; the average particle size is 5.0 µm or less; and further, the amount of deposited Fe is 0.10 mass% or more; the amount of Ti, Nb, and V deposited as deposits having a particle size of less than 20 nm is 0.025 mass% or more in terms of deposited C; and at least half of the deposits having a particle size of less than 20 nm is randomly deposited. Se proporciona una lámina de acero galvanizada de manera más excelente en términos de capacidad de troquelado. Una lámina de acero galvanizada que tiene una composición química que contiene, en % en masa, C: 0.08% a 0.20%, Si: 0.5% o menos, Mn: 0.8% a 1.8%, P: 0.10% o menos, S: 0.030% o menos, Al: 0.10% o menos, N: 0.010% o menos, uno, dos, o todos de Ti: 0.01% a 0.3%, Nb: 0.01% a 0.1%, y V: 0.01% a 1.0%, en la cual la relación (Ti/48 + Nb/93 + V/51) ? 12 ? 0.07 se cumple, y el resto de Fe e impurezas inevitables, y una microestructura que incluye una fase de ferrita y una fase de bainita revenida en una cantidad total de 95% o más en términos de relación de área, en la cual el diámetro de grano de la microestructura es 5.0 µm o menos, en la cual la cantidad de Fe precipitado es 0.10% en masa o más, en la cual la cantidad de Ti, Nb, y V precipitados en la forma de precipitados que tiene un diámetro de grano de menos que 20 nm es 0.025% en masa o más en términos de equivalente de C precipitado, y en el cual la mitad o más de los precipitados que tienen un diámetro de grano de menos que 20 nm se forman de manera aleatoria.