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US 4,260,419 AGranted
Aluminum alloy composition for the manufacture of container components from scrap aluminum
AssigneeCoors Container Company
InventorKing G. Robertson
Life of this patent
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AssigneeCoors Container Company
InventorKing G. Robertson
Estimating the term…
A composition whereby aluminum scrap, including consumer scrap, is recycled into aluminum sheet and aluminum containers. Aluminum scrap is melted in a heated furnace to form a melt composition. The melt is adjusted to form the present composition, consisting essentially of silicon, 0.1-1.0%; iron 0.1-0.9%; manganese 0.4-1.0%; magnesium 1.3-2.5%; copper 0.05-0.4%; and titanium, 0-0.2%, the balance being essentially aluminum. Aluminum scrap comprising consumer scrap, plant scrap, and can making scrap is heated to form the melt composition, which requires a minimum amount of adjustment to arrive at the present alloy composition. The composition is suitable for fabrication into sheet having strength and formability properties making it suitable for container manufacture. Container manufacture according to the process and composition of the present invention comprises drawn-and-ironed can body manufacture and easy-opening end manufacture. Sheet fabrication according to the present invention comprises conventional direct chill casting or continuous strip casting.
An aluminum alloy composition consisting essentially of silicon 0.15-0.40%;
An aluminum sheet for manufacturing an aluminum container component including drawn and ironed can bodies and easy open can ends, consisting essentially of about 0.15% to about 1.0% silicon, about 0.1% to about 0.9% iron, about 0.4% to about 1.0% manganese, about 1.3% to about 2.5% magnesium, about 0.05% to about 0.4% copper, and from 0% to about 0.2% titanium, said manganese and magnesium being present in a total concentration of 2.0%-3.3% and in a ratio of magnesium to manganese of between 1.4:1 and 4.4:1 with the balance being essentially aluminum, said composition for producing said sheet being produced from a melt derived from aluminum container scrap including both aluminum can end alloys and aluminum can body alloys with the addition of no more than 25% by weight of primary aluminum.
Dependencies are inferred from the claim text.