GALVANIZED STEEL SHEET AND PRODUCTION METHOD THEREFOR

Provided is a galvanized steel sheet more highly excellent in terms of punchability.A galvanized steel sheet having a chemical composition containing, by mass%, C: 0.08% to 0.20%, Si: 0.5% or less, Mn: 0.8% to 1.8%, P: 0.10% or less, S: 0.030% or less, Al: 0.10% or less, N: 0.010% or less, one, two,...

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Bibliographische Detailangaben
Hauptverfasser:	SASAKI Kana, TAHARA Kazunori, NABESHIMA Shigeyuki, MORIYASU Noriaki, KIZU Taro
Format:	Patent
Sprache:	eng ; fre ; ger
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 galvanized steel sheet more highly excellent in terms of punchability.A galvanized steel sheet having a chemical composition containing, by mass%, C: 0.08% to 0.20%, Si: 0.5% or less, Mn: 0.8% to 1.8%, P: 0.10% or less, S: 0.030% or less, Al: 0.10% or less, N: 0.010% or less, one, two, or all of Ti: 0.01% to 0.3%, Nb: 0.01% to 0.1%, and V: 0.01% to 1.0%, in which the relationship (Ti/48 + Nb/93 + V/51) × 12 ≥ 0.07 is satisfied, and a balance of Fe and inevitable impurities, and a microstructure including a ferrite phase and a tempered bainite phase in a total amount of 95% or more in terms of area ratio, in which the average grain diameter of the microstructure is 5.0 µm or less, in which the amount of Fe precipitated is 0.10 mass% or more, in which the amount of Ti, Nb, and V precipitated in the form of precipitates having a grain diameter of less than 20 nm is 0.025 mass% or more in terms of precipitate C equivalent, and in which half or more of precipitates having a grain diameter of less than 20 nm are formed at random.