COLD ROLLED AND HEAT TREATED STEEL SHEET, METHOD OF PRODUCTION THEREOF AND USE OF SUCH STEEL TO PRODUCE VEHICLE PARTS

The invention deals a cold rolled and heat treated steel sheet having a composition comprising the following elements, expressed in per cent by weight: 0.15 % = carbon = 0.6 % 4 % = manganese = 20 % 5 % = aluminum = 15 % 0 = silicon = 2 % aluminium + silicon = 6.5% and can possibly contain one or mo...

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Bibliographische Detailangaben
Hauptverfasser:	ZUAZO RODRIGUEZ, IAN ALBERTO, BARGES, PATRICK
Format:	Patent
Sprache:	eng ; fre
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:	The invention deals a cold rolled and heat treated steel sheet having a composition comprising the following elements, expressed in per cent by weight: 0.15 % = carbon = 0.6 % 4 % = manganese = 20 % 5 % = aluminum = 15 % 0 = silicon = 2 % aluminium + silicon = 6.5% and can possibly contain one or more of the following optional elements: 0.01% = niobium = 0.3%, 0.01% = titanium = 0.2% 0.01% = vanadium = 0.6% 0.01% = copper = 2.0% 0.01% = nickel = 2.0% cerium = 0.1% boron = 0.01% magnesium = 0.05% zirconium = 0.05% molybdenum = 2.0% tantalum = 2.0% tungsten = 2.0% the remainder being composed of iron and unavoidable impurities caused by elaboration, wherein the microstructure of said steel sheet comprises in area fraction, 10 to 50 % of austenite, said austenite phase optionally including intragranular kappa carbides, the reminder being regular ferrite and ordered ferrite of D03 structure, optionally including up to 2% of intragranular kappa carbides. It also deals with a manufacturing method and with use of such grade for making vehicle parts. L'invention concerne une tôle d'acier laminée à froid et traitée thermiquement ayant une composition comprenant les éléments suivants, exprimés en pourcentage en poids : 0,15 % = carbone = 0,6 %, 4 % = manganèse = 20 %, 5 % = aluminium = 15 %, 0 = silicium = 2 %, aluminium + silicium = 6,5 % et pouvant éventuellement contenir un ou plusieurs des éléments facultatifs suivants : 0,01 % = niobium = 0,3 %, 0,01 % = titane = 0,2 %, 0,01 % = vanadium = 0,6 %, 0,01 % = cuivre = 2,0 %, 0,01 % = nickel = 2,0 %, cérium = 0,1 %, bore = 0,01 %, magnésium = 0,05 %, zirconium = 0,05 %, molybdène = 2,0 %, tantale = 2,0 %, tungstène = 2,0 %, le reste étant composé de fer et d'impuretés inévitables résultant de l'élaboration. La microstructure de ladite tôle d'acier comprend, en fraction de surface 10 à 50 % d'austénite, ladite phase d'austénite comprenant éventuellement des carbures kappa intragranulaires, le reste étant une ferrite ordinaire et une ferrite ordonnée de structure D03, comprenant éventuellement jusqu'à 2 % de carbures kappa intragranulaires. L'invention concerne en outre un procédé de fabrication et l'utilisation d'un tel grade pour la fabrication de pièces de véhicule.