High strength cold-rolled steel sheet and method for manufacturing the same

A high strength cold-rolled steel plate which has a chemical composition in mass%: C: 0.04 to 0.10%, Si: 0.5 to 1.5%, Mn: 1.8 to 3%, P: 0.02% or less, S: 0.01% or less, Sol.Al: 0.01 to 0.1%, N: 0.005% or less, and the balance: Fe and inevitable impurities, and has a metal structure consisting substa...

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Bibliographische Detailangaben
Hauptverfasser:	KAWAMURA, KENJI, MATSUDA, HIROSHI, KITANO, FUSATO, HASEGAWA, KOHEI, TSURUMARU, HIDEYUKI
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:	A high strength cold-rolled steel plate which has a chemical composition in mass%: C: 0.04 to 0.10%, Si: 0.5 to 1.5%, Mn: 1.8 to 3%, P: 0.02% or less, S: 0.01% or less, Sol.Al: 0.01 to 0.1%, N: 0.005% or less, and the balance: Fe and inevitable impurities, and has a metal structure consisting substantially of a ferrite phase and a martensite phase. The high strength cold-rolled steel plate exhibits good ductility of an elongation of 18% or more and excellent stretch-flanging property of a bore expanding percentage of 60% or more, in combination with a tensile strength of 780 MPa or more, and thus can be suitably used for a structural member of an automobile.