Process for preparing an aluminum alloy sheet with improved...

Details Process for preparing an aluminum alloy sheet with improved... Process for preparing an aluminum alloy sheet with improved...

C - Chemistry, Metallurgy

22

C

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

Patent

CA 2445667

A process is described for producing an aluminum alloy sheet having excellent bendability for use in forming panels for automobiles. An aluminum alloy is used comprising 0.5 - 0.75% by weight Mg, 0.7 - 0.85% by weight Si, 0.15 - 0.35% by weight Mn 0.1 - 0.3% by weight Fe, optionally 0.2 - 0.4% by weight Cu and the remainder Al and incidental impurities, and this alloy is cast into ingots by semi-continous casting. The ingot is subjecting to hot rolling and cold rolling, followed by solution heat treatment of the formed sheet. This sheet material is then pre-aged by rapidly cooling from an initial pre-aging temperature of at least 80~C t room temperature at a cooling rate of more than 5~C/hour.

L'invention concerne un procédé de production d'une feuille en alliage d'aluminium dotée d'une excellente aptitude au pliage, ledit procédé étant utilisé dans la formation de panneaux pour automobiles. Cet alliage d'aluminium renferme entre 0,5 et 0,75 % en poids de Mg, entre 0,7 et 0,85 % en poids de Si, entre 0,15 et 0,35 % en poids de Mn, entre 0,1 et 0,3 % en poids de Fe, facultativement entre 0,2 et 0,4 % en poids de Cu, le reste d'Al et des impuretés diverses. On coule de manière semi-continue cet alliage en lingots. On soumet lesdits lingots à un laminage à chaud ou à froid, puis on les traite thermiquement dans une solution. On vieillit préalablement cette matière de feuille en la refroidissant rapidement d'une température initiale d'au moins 80 ·C à température ambiante, avec un taux de refroidissement de plus de 5 ·C par heure.

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