US 12,031,200 B2
Fin material made of aluminum alloy for heat exchanger
Yusuke Ohashi, Tokyo (JP); Atsushi Fukumoto, Tokyo (JP); Shogo Yamada, Kariya (JP); Shinichiro Takise, Kariya (JP); and Takahiro Shinoda, Kariya (JP)
Assigned to UACJ CORPORATION, Tokyo (JP)
Filed by UACJ Corporation, Tokyo (JP)
Filed on Dec. 1, 2020, as Appl. No. 17/108,286.
Application 17/108,286 is a division of application No. 15/907,572, filed on Feb. 28, 2018, abandoned.
Claims priority of application No. 2017-038219 (JP), filed on Mar. 1, 2017.
Prior Publication US 2021/0087657 A1, Mar. 25, 2021
Int. Cl. C22C 21/10 (2006.01); F28F 21/08 (2006.01)
CPC C22C 21/10 (2013.01) [F28F 21/084 (2013.01); F28F 2275/04 (2013.01)] 4 Claims
 
1. A method of manufacturing a fin material made of an aluminum alloy for heat exchangers, the method comprising:
a step of casting to obtain an ingot containing 1.0 to 2.0 mass % of Mn, 0.7 to 1.4 mass % of Si, and 0.05 to 0.3 mass % of Fe, with the balance being Al and unavoidable impurities;
after the step of casting, a step of hot rolling the ingot without being subjected to homogenizing treatment to obtain a hot-rolled material, with a range of heating temperature before the hot rolling being set to 380 to 480° C., and a range of temperature until the total rolling ratio reaches 50% after starting the hot rolling being set to 360 to 480° C.; and
after the step of hot rolling, a step of cold rolling the hot-rolled material to obtain a final fin material made of the aluminum alloy for heat exchangers, wherein
the step of cold rolling includes intermediate annealing, the intermediate annealing being performed at a temperature range of 100 to 280° C., and does not include final annealing,
the final fin material made of the aluminum alloy for heat exchangers contains 1.0 to 2.0 mass % of Mn, 0.7 to 1.4 mass % of Si, and 0.05 to 0.3 mass % of Fe, with the balance being Al and unavoidable impurities,
in the fin material made of an aluminum alloy for heat exchangers, a number density of intermetallic compounds having a circle-equivalent diameter of 0.025 to 0.4 μm is 3.0×106 particles/mm2 or more, and an amount of solid solution of Mn is 0.3 mass % or less.