Aluminum alloy fin material for heat exchanger excellent in strength, electrical conductivity, and brazeability, method for manufacturing aluminum alloy fin material for heat exchanger, and heat exchanger comprising aluminum alloy fin material for heat exchanger

Patent metadata

Field	Value
Publication number	US-11002498-B2
Application number	US-201514980138-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Dec 24, 2014
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

An aluminum alloy fin material for a heat exchanger in the present invention comprises an aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.5%, and Zn: 1.0 to 3.0% by mass and a remainder comprising Al and an unavoidable impurity, further containing one or two or more of Ti: 0.01 to 0.20%, Cr: 0.01 to 0.20% and Mg: 0.01 to 0.20% by mass as desired, and, after heating in brazing, has a tensile strength of 140 MPa or more, a proof stress of 50 MPa or more, an electrical conductivity of 42% IACS or more, an average grain diameter of 150 μm or more and less than 700 μm, and a potential of −800 mV or more and −720 mV or less.

First claim

What is claimed is:

1. An aluminum alloy fin material for a heat exchanger comprising an aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.35%, and Zn: 1.0 to 3.0% in terms of % by mass and a remainder comprising Al and an unavoidable impurity,
wherein, after brazing-equivalent heating, the aluminum alloy fin material has a tensile strength of 140 MPa or more, a proof stress of 50 MPa or more, an electrical conductivity of 42% IACS or more, an average grain diameter of 150 μm or more and less than 700 μm, and a potential in a range of −800 mV to −720 mV,
wherein the aluminum alloy fin material has an electrical conductivity of 45% IACS or more before brazing, and
wherein, in the aluminum alloy fin material before brazing, less than 5.0×10 4 /mm 2 of crystallized products having an equivalent circular diameter of 1.0 μm or more and 5.0×10 4 /mm 2 or more of Al—Mn—based, Al—Mn—Si-based, and Al—Fe—Si-based second-phase particles having an equivalent circular diameter of 0.01 to 0.10 μm are present.

2. The aluminum alloy fin material for a heat exchanger according to claim 1 , wherein the aluminum alloy further contains at least one of Ti: 0.01 to 0.20%, Cr: 0.01 to 0.20%, and Mg: 0.01 to 0.20% in terms of % by mass.

3. The aluminum alloy fin material for a heat exchanger according to claim 1 , wherein after the brazing-equivalent heating, the aluminum alloy fin material has, at 115° C., a tensile strength of 90 MPa or more and a proof stress of 40 MPa or more.

4. The aluminum alloy fin material for a heat exchanger according to claim 1 , wherein, after the brazing-equivalent heating, 1.0×10 4 /mm 2 or more of Al—Mn—based, Al—Mn—Si-based, and Al—Fe—Si-based second-phase particles having an equivalent circular diameter of 0.01 to 0.10 μm are present.

5. The aluminum alloy fin material for a heat exchanger according to claim 1 , having a plate thickness of 80 μm or less.

6. The aluminum alloy fin material for a heat exchanger according to claim 1 , having a recrystallization start temperature and a recrystallization end temperature in a range of 350° C. to 550° C., during heating for brazing.

7. A heat exchanger comprising the aluminum alloy fin material for a heat exchanger according to claim 1 .

8. A method for manufacturing the aluminum alloy fin material for a heat exchanger according to claim 1 , the method comprising:
casting, by a semicontinuous casting method, a molten aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.35%, and Zn: 1.0 to 3.0% in terms of % by mass and a remainder comprising Al and an unavoidable impurity;
subjecting an ingot obtained in the casting to homogenization treatment at a treatment temperature of 350° C. to 48 0 ° C. for a treatment time of 1 to 10 hours; and
carrying out soaking treatment with the temperature and treatment time of the homogenization treatment or less before hot rolling.

9. A method for manufacturing the aluminum alloy fin material for a heat exchanger according to claim 2 , the method comprising:
casting, by a semicontinuous casting method, a molten aluminum alloy having a composition containing Mn: 1.2 to 2.0%, Cu: 0.05 to 0.20%, Si: 0.5 to 1.30%, Fe: 0.05 to 0.35%, and Zn: 1.0 to 3.0% in terms of % by mass, at least one of Ti: 0.01 to 0.20%, Cr: 0. 01 to 0.20%, and Mg: 0.01 to 0.20% in terms of % by mass, and a remainder comprising Al and an unavoidable impurity;
subjecting an ingot obtained in the casting to homogenization treatment at a treatment temperature of 350° C. to 480° C. for a treatment time of 1 to 10 hours; and
carrying out soaking treatment with the temperature and treatment time of the homogenization treatment or less before hot rolling.

Assignees

• Mitsubishi Aluminium
• Denso Corp

Inventors

• Nakanishi Shigeki
• Iwao Shohei
• Edo Masakazu
• Teramoto Hayaki
• Hasegawa Manabu
• Yamamoto Michiyasu
• Teshima Shoei

Classifications

• C22F1/053

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

• C22C21/10 Primary

  with zinc as the next major constituent · CPC title

• F28F21/084 Primary

  from aluminium or aluminium alloys · CPC title

• C22F1/043

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

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title