Bake hardenable vanadium containing steel

C - Chemistry – Metallurgy – 22 – C

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C22C 38/12 (2006.01) C21D 8/04 (2006.01)

Patent

CA 2204492

Rolled articles such as hot rolled or cold rolled and annealed sheet and/or strip include effective amounts of vanadium in low carbon steels to produce an improved bake hardenable product especially adapted for automotive use. The use of vanadium in the alloy steel chemistry controls bake hardenability, permits solution annealing at lower temperatures in its manufacturing sequence and specifies a composition range which is more easily cast within desired limits and causes less variation in final mechanical properties. The steel has a composition consisting in weight percent of between 0.0005 and 0.1 % carbon, between zero and less than 0.04 % nitrogen, between zero and less than 0.5 % of a nitride forming element, between zero and 0.5 % aluminium, between zero and up to 2.5 % manganese, between 0.005 and 0.6 % vanadium with the balance iron and inevitable impurities.

Des articles laminés tels qu'une bande et/ou un feuillard laminé à chaud ou laminé à froid et recuit contiennent des quantités efficaces de vanadium dans des aciers à faible teneur en carbone afin d'obtenir un produit amélioré pouvant être durci à la cuisson et spécialement adapté à l'industrie automobile. L'utilisation de vanadium dans la chimie des alliages d'acier permet de contrôler les caractéristiques de durcissement à la cuisson, permet un recuit en solution à des températures plus basses au cours de sa fabrication et permet de spécifier une plage de composition facilitant la coulée à l'intérieur de limites recherchées et entraîne moins de variations dans les propriétés mécaniques finales. La composition de cet acier en, pourcentage pondéral, est la suivante: entre 0,0005 et 0,1 % de carbone; entre 0 et moins de 0,04 % d'azote, entre 0 et moins de 0,5 % d'un élément formant nitrure, entre 0 et 0,5 % d'aluminium, entre 0 et jusqu'à 2,5 % de manganèse, entre 0,005 et 0,6 % de vanadium, le reste étant du fer et les impuretés inévitables.

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