STEEL SHEET, MEMBER, AND METHOD FOR MANUFACTURING STEEL SHEET AND MEMBER

Provided are a steel sheet having high strength, high ductility, excellent stretch flange formability, and good chemical convertibility; a related member; and methods for manufacturing them.The steel sheet has a chemical composition including specific amounts of C, Si, Mn, P, S, sol. Al, and N in ma...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUI, Yoichiro, KANEKO, Shinjiro, YOKOTA, Takeshi, WANG, Fangyi, CHIBA, Tadachika, OZONO, Shuto
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:	Provided are a steel sheet having high strength, high ductility, excellent stretch flange formability, and good chemical convertibility; a related member; and methods for manufacturing them.The steel sheet has a chemical composition including specific amounts of C, Si, Mn, P, S, sol. Al, and N in mass%. The steel sheet has a specific ratio of the total of polygonal ferrite, upper bainite, retained γ, fresh martensite, tempered martensite, and lower bainite, and a specific ratio of a remaining microstructure. The steel sheet has a specific ratio of the number of fresh martensite grains and retained γ grains having an equivalent circular diameter of less than 1.2 um, and has a specific ratio of the number of fresh martensite grains and retained γ grains having an aspect ratio of 2.5 or more and an equivalent circular diameter of 1.2 um or more.