Aluminium-silicon-magnesium alloy having improved ductility...

C - Chemistry – Metallurgy – 22 – C

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C22C 21/08 (2006.01) C22C 21/00 (2006.01) C22C 21/02 (2006.01) C22F 1/04 (2006.01) C22F 1/043 (2006.01) C22F 1/047 (2006.01) C22F 1/05 (2006.01)

Patent

CA 2152402

Aluminium-silicon-magnesium alloys having improved ductility and deep-drawing properties for use as sheet or strip, and a method for producing same, are disclosed. The sheet or strip is particularly suitable for deep-drawing and motor vehicle bodywork in particular. The claimed alloy has a chemical composition consisting of: 0.1-0.8 wt % Mn, 0.25-0.8 wt % Mg, 0.5-1.3 wt % Si, up to 0.9 wt % Cu, up to 0.5 wt % Fe, and other elements up to 0.5 wt % each and 0.15 in all, with the balance being Al. The sheet and strip are produced by casting, hot rolling under special reheating and rolling conditions, cold rolling, age-hardening, forming and curing of coatings, and optionally pre-tempering performed between quenching and age-hardening.

L'invention concerne des alliages d'aluminium type Al-Si-Mg à ductilité et emboutissabilité améliorées, utilisés sous forme de tôles ou bandes, ainsi qu'un procédé d'obtention de ceux-ci. Les tôles ou bandes sont particulièrement destinées à l'emboutissage et en particulier à la carrosserie automobile. L'alliage revendiqué possède la composition chimique suivante (en poids %): de 0,1 à 0,8 Mn; de 0,25 à 0,8 Mg; de 0,5 à 1,3 Si; jusqu'à 0,9 Cu; jusqu'à 0,5 Fe; jusqu'à 0,5 (chacun) et 0,15 (au total) d'autres éléments; reste Al. Ces tôles et bandes sont obtenues par coulée, laminage à chaud dans des conditions de réchauffage et de laminage particulières, laminage à froid, mâturation, formage et cuisson des revêtements, un pré-revenu étant éventuellement pratiqué entre trempe et mâturation.

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