	US 11,933,553 B2
	Aluminum alloy for heat exchanger fins
Kevin Michael Gatenby, Johns Creek, GA (US); Hany Ahmed, Atlanta, GA (US); Andrew D. Howells, Kingston (CA); Jyothi Kadali, Atlanta, GA (US); Derek Aluia, Novi, MI (US); and John Michael Baciak, III, Royal Oak, MI (US)
Assigned to NOVELIS INC., Atlanta, GA (US); and DENSO CORPORATION, Aichi (JP)
Filed by NOVELIS INC., Atlanta, GA (US); and Denso Corporation, Aichi (JP)
Filed on Mar. 28, 2022, as Appl. No. 17/656,793.
Application 17/656,793 is a division of application No. 14/816,280, filed on Aug. 3, 2015, abandoned.
Claims priority of provisional application 62/033,879, filed on Aug. 6, 2014.
Prior Publication US 2022/0221236 A1, Jul. 14, 2022
Int. Cl. C22F 1/04 (2006.01); B22D 21/04 (2006.01); B23K 1/00 (2006.01); C22C 21/00 (2006.01); C22C 21/02 (2006.01); C22C 21/10 (2006.01); C22F 1/043 (2006.01); C22F 1/053 (2006.01); F28F 21/08 (2006.01)

CPC F28F 21/084 (2013.01) [B22D 21/04 (2013.01); B23K 1/0012 (2013.01); C22C 21/00 (2013.01); C22C 21/02 (2013.01); C22C 21/10 (2013.01); C22F 1/04 (2013.01); C22F 1/043 (2013.01); C22F 1/053 (2013.01)]

10 Claims

1. A process of making a fin stock aluminum alloy sheet, comprising:

direct chill casting into an ingot an aluminum alloy comprising 0.9-1.2 wt. % Si, 0.3-0.5 wt. % Fe, 0.20-0.40 wt. % Cu, 1.25-1.5 wt. % Mn, 0-0.1 wt. % Mg, 2.0-3.0 wt. % Zn, less than 0.01 wt. % Zr, less than 0.01 wt. % Cr, and Al and impurities at ≤0.15 wt. %, wherein each impurity is below 0.05 wt. %;

hot rolling the ingot into a hot rolled sheet;

cold rolling the hot rolled sheet into an intermediate thickness sheet;

inter-annealing the intermediate thickness sheet at 200-400° C.; and,

cold rolling the intermediate thickness sheet to achieve a % cold work (% CW) of 20 to 40%, resulting in the fin stock aluminum alloy sheet having a thickness of 70-100 μm.