Production of aluminum alloy foils having high strength and good rollability
AssigneeAlcan International Limited
InventorsIljoon Jin, Kevin Gatenby, Christopher Gabryel, Toshiya Anami, Takahiko Watai, Ichiro Okamoto
Life of this patent
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Abstract
An aluminum alloy foil is formed from an alloy containing about 1.2 to 1.7% by weight Fe and about 0.35 to 0.80% by weight Si, with the balance aluminum and incidental impurities. The alloy is continuously strip cast to form a strip having a thickness less than about 25 mm, which is then cold rolled to interanneal gauge and interannealed at a temperature of at least 400° C. The interannealed strip is cold rolled and further annealed to form the final foil product, having excellent rollability combined with high strength of the final foil.
Claims10
A process for producing an aluminum foil product by continuous strip casting in which the product exhibits excellent rollability combined with high strength of final foil product comprising the steps of:
- (a) providing an aluminum alloy containing 1.2 to 1.7% by weight Fe and 0.35 to 0.80% by weight Si, with the balance aluminum and incidental impurities,
- (b) continuous strip casting the alloy on a belt caster to form a cast strip having an as-cast thickness of less than about 5 to 25 mm,
- (c) cold rolling the cast strip to interanneal gauge,
- (d) interannealing the strip at a temperature of at least 400° C.,
- (e) cold rolling the interanneal strip to final gauge, and
- (f) subjecting the final gauge strip to a final anneal.
A process for producing an aluminum foil product by continuous strip casting in which the product exhibits excellent rollability combined with high strength of final foil product comprising the steps of:
- (a) providing an aluminum alloy consisting essentially of 1.2 to 1.7% by weight Fe and 0.35 to 0.80% by weight Si, with the balance aluminum and incidental impurities,
- (b) continuous strip casting the alloy on a belt caster to form a cast strip having an as-cast thickness of about 5 to 25 mm,
- (c) cold rolling the cast strip to interanneal gauge,
- (d) interannealing the strip, said interannealing consisting of annealing at a temperature of at least 400° C.,
- (e) cold rolling the interanneal strip to final gauge, and
- (f) subjecting the final gauge strip to a final anneal, wherein step (d) is performed such that the strip after interannealing and a cold reduction of 90% has an ultimate tensile strength (UTS) of below 190 MPa, and wherein the strip after step (f) has a UTS of 90 MPa or higher at 0 temper.
Dependencies are inferred from the claim text.