Aluminum alloy composition and methods of manufacture

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 21/00 (2006.01) C22F 1/04 (2006.01)

Patent

CA 2212366

The invention provides a new aluminum-based alloy having properties which mimic homogenized DC cast 3003 alloy, and a low-cost method for manufacturing the alloy. The alloy contains 0.40 % to 0.70 % Fe, 0.10 % to less than 0.30 % Mn, more than 0.10 % to 0.25 % Cu, less than 0.10 % Si, optionally up to 0.10 % Ti, and the balance Al and incidental impurities. The alloy achieves properties similar to homogenized DC cast 3003 alloy when continuously cast, followed by cold rolling and, if desired, annealing at final gauge. Surprisingly, no other heat treatments are required.

La présente invention concerne un nouvel alliage à base d'aluminium dont les propriétés imitent celles de l'alliage 3003 homogénéisé coulé directement en coquille. Elle concerne aussi un procédé peu coûteux de fabrication de cet alliage. Celui-ci contient de 0,40 à 0,70 % de fer, de 0,10 % à moins de 0,30 % de manganèse, plus de 0,10 % et jusqu'à 0,25 % de cuivre, moins de 0,10 % de silicium, facultativement jusqu'à 0,10 % de titane, le solde étant de l'aluminium et des impuretés accidentelles. Cet alliage atteint des propriétés similaires à celles de l'alliage 3003 homogénéisé coulé directement en coquille quand il est coulé en continu puis laminé à froid et, si on le désire, recuit aux cotes finales. De façon surprenante, il n'est pas nécessaire d'appliquer d'autres traitements thermiques.

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