STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING THEM

A steel sheet including a chemical composition satisfying an equivalent carbon content of 0.35% or more and less than 0.60% and a steel microstructure with an area fraction of ferrite: 40% to 85%, tempered martensite and bainite: 10% to 55% in total, retained austenite: 3% to 15%, and ferrite, tempe...

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Bibliographische Detailangaben
Hauptverfasser:	SATO, Kentaro, NAKAGAITO, Tatsuya, SAKAIDANI, Tomohiro, KOMINE, Shinsuke
Format:	Patent
Sprache:	eng
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:	A steel sheet including a chemical composition satisfying an equivalent carbon content of 0.35% or more and less than 0.60% and a steel microstructure with an area fraction of ferrite: 40% to 85%, tempered martensite and bainite: 10% to 55% in total, retained austenite: 3% to 15%, and ferrite, tempered martensite, bainite, and retained austenite: 93% or more in total. A 90-degree bending at a curvature radius/thickness ratio of 4.2 in a rolling (L) direction with respect to an axis extending in a width (C) direction causes a change of 0.50 or more in (a grain size in a thickness direction)/(a grain size in a direction perpendicular to the thickness) of the tempered martensite in an L cross section in a 0- to 50-μm region from a surface of the steel sheet on a compression side, and the steel sheet has a tensile strength of 590 MPa or more.