High-strength aluminum alloy fin material and production method thereof

Patent metadata

Field	Value
Publication number	US-10280495-B2
Application number	US-201314423163-A
Country	US
Kind code	B2
Filing date	Jun 4, 2013
Priority date	Aug 30, 2012
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

An aluminum alloy fin material for heat exchanger use having a 35 to 50 μm thickness, a small springback at the time of corrugation, a suitable strength before brazing enabling easy fin formation, a high strength after brazing, and excellent erosion resistance, self corrosion resistance, and sacrificial anodic effect and a method of production of the same are provided. A fin material containing, by mass %, Si: 0.9 to 1.2%, Fe: 0.8 to 1.1%, Mn: 1.1 to 1.4%, and Zn: 0.9 to 1.1%, further limiting the impurity Mg to 0.05% or less, Cu to 0.03% or less, and ([Si]+[Fe]+2[Mn])/3 to 1.4% to 1.6%, and having a balance of unavoidable impurities and Al. A method of production prescribing hot rolling, cold rolling, intermediate annealing, and final cold rolling.

First claim

The invention claimed is:

1. An aluminum alloy fin material for heat exchanger use containing, by mass %, Si: 0.9 to 1.2%, Fe: 0.8 to 1.1%, Mn: 1.1 to 1.4%, and Zn: 0.9 to 1.1%, further limiting the impurity Mg to 0.05% or less, Cu to 0.03% or less, and concentration of content of ([Si]+[Fe]+2[Mn])/3 to 1.4% to 1.6%, and having a balance of unavoidable impurities and Al, wherein
a final sheet thickness is 35 to 50 μm, a tensile strength before brazing is 215 MPa or less, a solidus temperature is 620° C. or more, a tensile strength after brazing is 140 MPa or more, an electrical conductivity after brazing is 45% IACS or more, and a rest potential after brazing is −730 mV to −760 mV.

2. An aluminum alloy fin material for heat exchanger use according to claim 1 , wherein an electrical conductivity after brazing is 45% IACS to 46.3% IACS or less.

3. An aluminum alloy fin material for heat exchanger use according to claim 1 , wherein the final sheet thickness is 35 μm.

4. An aluminum alloy fin material for heat exchanger use according to claim 1 , containing Zn of 0.95 to 1.1%.

5. An aluminum alloy fin material for heat exchanger use according to claim 1 , containing Zn of 0.95 to 1.05%.

6. An aluminum alloy fin material for heat exchanger use according to claim 1 , having a concentration of content of ([Si]+[Fe]+2[Mn])/3 of 1.46% to 1.53%.

7. A method of production of an aluminum alloy fin material for heat exchanger use according to claim 1 , comprising pouring a melt of the composition according to claim 1 , using a thin slab continuous casting machine to continuously cast a thickness 3 to 20 mm thin slab, using a hot rolling mill to roll the thin slab to 0.5 to 5 mm, winding it up in a roll, then cold rolling it to a sheet thickness of 0.05 to 0.1 mm, annealing it at a holding temperature of 250 to 450° C. for intermediate annealing, and cold rolling it with a final cold rolling rate of 25 to 50% to a final sheet thickness of 35 to 50 μm.

8. A method of production of aluminum alloy fins for heat exchanger use according to claim 1 , comprising pouring a melt of the composition according to claim 1 , using a thin slab continuous casting machine to continuously cast a thickness 3 to 10 mm thin slab, winding it up in a roll, then cold rolling it as a first stage to a sheet thickness of 1.0 to 6.0 mm, annealing it at 300 to 500° C. for primary intermediate annealing, further cold rolling it as a second stage to a sheet thickness of 0.05 to 0.1 mm, annealing it at 250 to 450° C. for secondary intermediate annealing, and cold rolling it with a final cold rolling rate of 25 to 50% to a final sheet thickness of 35 to 50 μm.

Assignees

• Denso Corp
• Nippon Light Metal Co
• Novelis Inc

Inventors

• Kokubo Takanori
• Anami Toshiya
• Teramoto Hayaki
• Ota Hideyuki
• Ninagawa Toshihide

Classifications

• B22D11/003

  Aluminium alloys · CPC title

• C22C21/02

  with silicon as the next major constituent · CPC title

• C22F1/04

  of aluminium or alloys based thereon · CPC title

• F28F19/00

  Preventing the formation of deposits or corrosion, e.g. by using filters {or scrapers} · CPC title

• F28F2275/04

  by brazing · CPC title