ALUMINIUM FOIL ALLOY
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.