| CPC C22F 1/047 (2013.01) [B21B 1/46 (2013.01); B21B 1/463 (2013.01); B21B 3/00 (2013.01); C22C 21/00 (2013.01); C22C 21/06 (2013.01); C22C 21/08 (2013.01); B21B 2003/001 (2013.01)] | 27 Claims |
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1. A method, consisting of
forming a melt composition comprising from 0.45 wt. % to 0.95 wt. % manganese, 1.3 wt. % to 1.95 wt. % magnesium, 0.1 wt. % to 0.5 wt. % copper, 0.2 wt. % to 0.7 wt. % iron, and 0.1 wt. % to 0.5 wt. % silicon, at least part of the melt composition is derived from scrap, wherein the melt composition comprises aluminum prime, and wherein the balance of the melt composition consists essentially of aluminum and incidental additional materials and impurities;
forming the melt composition into a cast strip having a cast temperature exceeding a recrystallization of an alloy formed from the melt composition, the cast strip comprising from 0.7 to 0.9 wt. % manganese, and from 1.55 to 1.65 wt. % magnesium;
hot rolling the cast strip to form a hot rolled cast strip having a thickness that is less than a thickness of the cast strip and a gauge ranging from 0.06 to 0.12 inches;
after hot rolling, hot mill annealing the hot rolled cast strip to form an annealed hot rolled cast strip, a minimum temperature of the hot mill annealing being 725 degrees Fahrenheit and a maximum temperature being 900 degrees Fahrenheit;
cooling the annealed hot rolled cast strip to a temperature less than a recrystallization temperature of the hot rolled cast strip to form a cooled cast strip;
cold rolling the cooled cast strip to form a first cold rolled cast strip having a gauge ranging from 0.020 to 0.04 inches, wherein a reduction in thickness of the hot rolled cast strip in the first cold rolling is less than 73% to be below a level required for the first cold rolled cast strip to realize a full hard state;
intermediate annealing the first cold rolled cast strip at a minimum temperature of 710 degrees Fahrenheit and a maximum temperature of 850 degrees Fahrenheit to form an intermediate annealed first cold rolled cast strip;
cooling the intermediate annealed first cold rolled cast strip to a temperature less than a recrystallization temperature of the intermediate annealed first cold rolled cast strip;
cold rolling the cooled intermediate first cold rolled annealed strip to form a second cold rolled cast strip, the second cold rolled cast strip being fully cold rolled and having a finished gauge ranging from 0.009 to 0.013 inches, wherein a reduction in thickness of the intermediate annealed first cold rolled cast strip in the second cold rolling is less than 73% to be below a level required for the second cold rolled cast strip to realize a full hard state; and
before the second cold rolled cast strip is fabricated into a drawn and ironed container body for a beverage container, stabilize annealing the second cold rolled cast strip at a minimum temperature of 300 degrees Fahrenheit and a maximum temperature of 500 degrees Fahrenheit to form a stabilize annealed strip, wherein the stabilize annealed strip has a final yield strength of no more than 39 ksi, a final tensile strength of no more than 43 ksi, a final elongation of no more than 6%, a minimum dome reversal strength of at least 90 psi, and a column strength of at least 230 psi.
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