Process for producing an aluminium alloy brazing sheet,...

C - Chemistry – Metallurgy – 22 – C

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C22C 21/00 (2006.01) B32B 15/01 (2006.01) C22F 1/04 (2006.01)

Patent

CA 2565978

The invention relates to a process for producing an Al-Mn alloy sheet with improved liquid film migration resistance when used as core alloy in brazing sheet, comprising the steps of: casting an ingot having a composition comprising (in weight percent): 0.5 < Mn <= 1.7 0.06<Cu<=1.5 Si <= 1.3 Mg <= 0.25 Ti < 0.2 Zn <= 2.0 Fe <= 0.5 at least one element of the group of elements consisting of 0.05 < Zr <=0.25 and 0.05 < Cr<=0.25 other elements < 0.05 each and total <0.20, balance Al. homogenisation and preheat hot rolling .bullet. cold rolling (including intermediate anneals whenever required), and wherein the homogenisation temperature is at least 450 ~C for a duration of at least 1 hour followed by an air cooling at a rate of at least 20 ~C/h and wherein the pre-heat temperature is at least 400 ~C for at least 0.5 hour.

L'invention concerne un procédé de production d'une feuille d'alliage Al-Mn présentant une résistance accrue à la migration de film liquide, lorsque cet alliage de noyau est utilisé en feuille de brasage. Ce procédé consiste à: couler un lingot présentant une composition comprenant (en pourcentage en poids): 0,5< Mn=1,7; 0,06<Cu=1,5; Si =1,3; Mg=0,25; Ti<0,2; Zn=2,0; Fe=0,5; au moins un élément du groupe des éléments comprenant: 0,05<Zr=0,25 et 0,05<Cr=0,25; d'autres éléments étant chacun inférieur à 0,05 et au total étant inférieur à 0,20; le reste étant Al. Puis, le procédé comprend les étapes suivantes: homogénéisation et préchauffage, laminage à chaud, laminage à froid (comprenant des recuits intermédiaires, le cas échéant), la température d'homogénéisation étant d'au moins 450 ·C, pendant une durée d'au moins une heure, suivi d'un refroidissement par air à au moins 20 ·C/heure, la température de préchauffage étant d'au moins 400 ·C, pendant au moins 30 minutes.

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