GALVANIZED STEEL SHEET, MEMBER, AND METHODS FOR PRODUCING THESE

There is provided a galvanized steel sheet having excellent uniform deformation properties and local deformation properties and having a tensile strength of 980 MPa or more, a member, and methods for manufacturing them.The galvanized steel sheet includes a steel sheet and a galvanized layer formed o...

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Bibliographische Detailangaben
Hauptverfasser:	KAWASAKI, Yoshiyasu, NAKAGAITO, Tatsuya, TERASHIMA, Shotaro
Format:	Patent
Sprache:	eng ; fre ; ger
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 METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	There is provided a galvanized steel sheet having excellent uniform deformation properties and local deformation properties and having a tensile strength of 980 MPa or more, a member, and methods for manufacturing them.The galvanized steel sheet includes a steel sheet and a galvanized layer formed on the steel sheet, the steel sheet having a predetermined chemical composition and a microstructure containing, in terms of area fraction, ferrite: 20% to 70% and martensite: 30% to 80%, in which each of the proportion of low-Mn ferrite and the proportion of high-Mn ferrite in the entire ferrite is 20% or more and 80% or less in terms of area fraction, martensite has an average crystal grain size of 10 um or less, and the amount of diffusible hydrogen in steel is 0.30 mass.ppm or less.