Aluminum alloy fin material for heat exchanger and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11807919-B2
Application number	US-201716475942-A
Country	US
Kind code	B2
Filing date	Dec 1, 2017
Priority date	Jan 6, 2017
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

An aluminum alloy fin material for a heat exchanger is made of an aluminum alloy including 0.05 mass % to 0.5 mass % of Si, 0.05 mass % to 0.7 mass % of Fe, 10 mass % to 2.0 mass % of Mn, 0.5 mass % to 1.5 mass % of Cu, and 3.0 mass % to 7.0 mass % of Zn, with the balance being Al and unavoidable impurities. In an L-ST plane thereof, second-phase grains having an equivalent circle diameter equal to or more than 0.030 μm and less than 0.50 μm have a perimeter density of 0.30 μm/μm2 or more, second-phase grains having an equivalent circle diameter equal to or more than 0.50 μm have a perimeter density of 0.030 μm/μm2 or more, and specific resistance thereof at 20° C. is 0.030 μΩm or more.

First claim

The invention claimed is:

1. An aluminum alloy fin material for a heat exchanger, the aluminum alloy fin material comprising an aluminum alloy including 0.5 mass % to 1.0 mass % of Si, 0.05 mass % to 0.7 mass % of Fe, 1.0 mass % to 2.0 mass % of Mn, 0.3 mass % to 1.2 mass % of Cu, and 2.2 mass % to 5.8 mass % of Zn, with the balance being Al and unavoidable impurities, wherein
in an L-ST plane, second-phase grains having an equivalent circle diameter equal to or more than 0.030 μm and less than 0.50 μm have a perimeter density of 0.30 μm/μm 2 or more, second-phase grains having an equivalent circle diameter equal to or more than 0.50 μm have a perimeter density of 0.030 μm/μm 2 or more, wherein the perimeter density is the sum of the perimeters measured by imaging the second-phase grains divided by the imaging area, and
specific resistance thereof at 20° C. is 0.030 μΩm or more.

2. The aluminum alloy fin material according to claim 1 , wherein the aluminum alloy further includes at least one selected from 0.05 mass % to 0.3 mass % of Ti, 0.05 mass % to 0.3 mass % of Zr, and 0.05 mass % to 0.3 mass % of Cr.

3. A method for manufacturing the aluminum alloy fin material for a heat exchanger according to claim 1 , the method comprising:
a casting step of acquiring a sheet-like ingot by a twin-roll type continuous casting rolling method; and
a cold rolling step of subjecting the sheet-like ingot to cold rolling with at least one pass, to acquire the aluminum alloy fin material for a heat exchanger, wherein
when L (mm) is a contact arc length between a roll and material in cold rolling in the cold rolling step, H (mm) is half of sum of thicknesses on a roller inlet side and a roller outlet side, and L/H is a rolling shape ratio, a minimum value of the rolling shape ratio of each pass of cold rolling in the cold rolling step is 1.0 or more, and
at least one annealing is performed before a first pass, between a pass and another pass, or after a final pass in cold rolling in the cold rolling step, and a maximum achievable temperature of annealing performed at highest temperature in the at least one annealing is 370° C. to 520° C.

Assignees

• Uacj Corp

Inventors

• Nakagawa Wataru
• Fukumoto Atsushi
• Mochizuki Junichi
• Ide Tatsuya

Classifications

• C22C21/10 Primary

  with zinc as the next major constituent · CPC title

• B21B3/00

  Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences {; Rolling of aluminium, copper, zinc or other non-ferrous metals}(altering special metallurgical properties of alloys, other than structure consolidation or mechanical properties resulting therefrom C21D, C22F) · CPC title

• B22D7/005

  from non-ferrous metals · CPC title

• C22F1/053

  of alloys with zinc as the next major constituent · CPC title

• F28F21/084

  from aluminium or aluminium alloys · CPC title