Brazeable aluminum alloy sheet and process of making same

C - Chemistry – Metallurgy – 22 – C

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75/85, 148/35.4

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

Patent

CA 2001140

A brazeabl aluminum alloy sheet consisting essentially of 0.8 to 1.3wt% of Mn, 0.2 to 0.7wt% of Si, one or two of 0.04 to 0.1wt% of In and 0.1 to 2.0wt% of Zn, the balance being aluminum and unavoidable impurites. The brazeabl aluminum alloy sheet is produced by a process which comprises preparing an ingot of aluminum alloy containing 0.8 to 1.3wt% of Mn and 0.2 to 0.7wt% of Si, the balance being aluminum and unavoidable impurites, hot rolling the aluminum mass at a temperature of 350 to 450°C without conducting a homogenizing treatment, conducting a first part of cold rolling on the hot rolled aluminum alloy, conducting a process annealing on the aluminum alloy at a temperature of 350 to 420°C, and conducting a second part of cold rolling on the annealed aluminum alloy at a draft percentage of 20 to 40%.

Feuille d'alliage d'aluminium apte au brasage constituée essentiellement de 0,8 à 1,3 % en poids de Mn, 0,2 à 0,7 % en poids de Si, 0,04 à 0,1 % en poids d'In et/ou 0,1 à 2,0 % en poids de Zn, le reste étant de l'aluminium et des impuretés inévitables. La feuille d'alliage d'aluminium apte au brasage est fabriquée par un procédé qui comprend la préparation d'un lingot d'alliage d'aluminium contenant 0,8 à 1,3 % en poids de Mn et 0,2 à 0,7 % en poids de Si, le reste étant de l'aluminium et des impuretés inévitables, le laminage à chaud de la masse d'aluminium à une température de 350 à 450 degrés C sans traitement d'homogénéisation, un premier laminage à froid de l'alliage d'aluminium laminé à chaud, le recuit de l'alliage d'aluminium à une température de 350 à 420 degrés C et un second laminage à froid de l'alliage d'aluminium recuit à un pourcentage d'étirage de 20 à 40 %.

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