Aluminium foil alloy

Abstract

An aluminium alloy product having a gauge below 200 μm and a composition, in weight %, of Fe 1.0-1.8, Si 0.3-0.8, Mn up to 0.25, other elements less than or equal to 0.05 each and less than or equal to 0.15 in total, balance aluminium. A process of manufacturing the product includes the steps of continuous casting an aluminium alloy melt of the above composition, cold rolling the cast product without an interanneal step to a gauge below 200 μm and final annealing the cold rolled product. The product may be a deep drawn container.

1 . An aluminium alloy product having a gauge below 200 μm and the following composition in weight %:
 Fe 1.1-1.7 
 Si 0.3-0.8 
 Mn up to 0.25 
 Other elements less than or equal to 0.05 each and less than or equal to 0.15 in total 
 Al balance 
 
       wherein the aluminium alloy product possesses the following properties:
 in the transverse direction:
 yield stress >100 MPa 
 UTS >130 MPa 
 elongation >19 
 product of UTS×elongation >2500. 
 
 in the longitudinal direction:
 yield stress >100 MPa 
 UTS >140 MPa 
 elongation >18 
 product of UTS×elongation >2500. 
 
 
     
     
         2 . A product according to  claim 1  obtainable by the process of
 (a) continuous casting an aluminium alloy melt of said composition; 
 (b) cold rolling the cast product without an interanneal step to a gauge below 200 μm and 
 (c) final annealing the cold rolled product. 
 
     
     
         3 . A product according to  claim 1 , comprising a deep drawn container. 
     
     
         4 . A product according to  claim 1 , in which the Si content is 0.62-0.8 weight %, the composition has an Fe:Si ratio between 1.5 and 2.58, and the Mn content is 0.05-0.25 weight %. 
     
     
         5 . A product according to  claim 4 , in which the Fe content is 1.2-1.6 weight %. 
     
     
         6 . A product according to  claim 4 , in which the Si content is 0.62-0/weight %. 
     
     
         7 . A product according to  claim 4 , in which the predominant intermetallic phase is the cubic α-AlFeSi phase. 
     
     
         8 . A product according to  claim 4 , in which the Mn content is 0.05-0.20 weight %. 
     
     
         9 . A product according to  claim 8  in which the Mn content is 0.05-0.15 weight %. 
     
     
         10 . A product according to  claim 4 , obtainable by the process of
 (a) continuous casting an aluminium alloy melt of said composition;   (b) cold rolling the cast product without an interanneal step to a gauge below 200 μm, and   (c) final annealing the cold rolled product.