# US 7,407,714 B2 · Process by producing an aluminium alloy brazing sheet, aluminium alloy brazing sheet

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- Number: US 7,407,714 B2
- Document ID: US7407714B2
- Status: Granted
- Kind: B2
- Application number: 11/136,725
- Filed: 2005-05-25
- Published: 2006-01-19
- Granted: 2008-08-05
- Earliest claimed: 2004-05-26
- Assignees: Aleris Aluminum Koblenz GmbH; Aleris Aluminum Canada S.E.C.
- Inventors: Scott W. Haller; Job Anthonius Van Der Hoeven; Klaus Vieregge; Achim Bürger; Sampath Desikan
- Web page: https://patentgrep.com/patent/US7407714B2

## CPC

- C22C 21/12: with copper as the next major constituent
- B23K 35/286: {Al as the principal constituent}
- C22C 21/00: Alloys based on aluminium
- C22F 1/04: of aluminium or alloys based thereon
- Y10S 165/905: Materials of manufacture
- Y10T 428/12764: Next to Al-base component
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a process for producing an Al—Mn alloy sheet with improved liquid film migration resistance when used as core alloy in brazing sheet, including the steps of: casting an ingot having a composition comprising (in weight percent): 0.5<Mn≦1.7, 0.06<Cu≦1.5, Si≦1.3, Mg≦0.25, Ti<0.2, Zn≦2.0, Fe≦0.5, at least one element of the group of elements of 0.05<Zr≦0.25 and 0.05<Cr≦0.25; other elements <0.05 each and total <0.20, balance Al; homogenisation and preheat; hot rolling; cold rolling (including intermediate anneals whenever required), and wherein the homogenisation temperature is at least 450° C. for a duration of at least 1 hour followed by an air cooling at a rate of at least 20° C./h and wherein the pre-heat temperature is at least 400° C. for at least 0.5 hour.

## Claims

### Claim 1

Process for producing an Al—Mn alloy sheet with improved liquid film migration resistance when used as core alloy in brazing sheet, comprising the steps of:
casting a composition comprising (in weight percent):
0.5<Mn≦1.7
0.06<Cu≦1.5
Si≦1.3
Mg≦0.25
Ti<0.2
Zn≦2.0
Fe≦0.5
0.05<Cr≦0.12 and Zr<0.01,
other elements <0.05 each and total <0.20, balance Al.
homogenisation and preheat
hot rolling
cold rolling (including intermediate anneals whenever required), and wherein the homogenisation temperature is at least 450° C. for a duration of at least 1 hour followed by an air cooling at a rate of at least 20° C./h and wherein the pre-heat temperature is at least 400° C. for at least 0.5 hour.

### Claim 2 (depends on 1)

Process according to claim 1, wherein the homogenisation temperature is between about 530° C. and 620° C. for between 1 to 25 hours, and wherein the pre-heat temperature is between about 400° C. and 530° C. for between 1 to 25 hours.

### Claim 3 (depends on 1)

Process according to claim 1, wherein Si≦0.8%.

### Claim 4 (depends on 1)

Process according to claim 1, wherein Si≦0.3%.

### Claim 5 (depends on 1)

Process according to claim 1, wherein Si≦0.15%.

### Claim 6 (depends on 1)

Process according to claim 1, wherein Mn is in between 0.7 and 1.4%.

### Claim 7 (depends on 1)

Process according to claim 1, wherein 0.08<Cr≦0.12.

### Claim 8 (depends on 1)

Process according to claim 1, wherein Mg≦0.15%.

### Claim 9 (depends on 1)

Process according to claim 1, wherein Mg≦0.05%.

### Claim 10 (depends on 1)

Process according to claim 1, wherein preferably Zn≦0.4%.

### Claim 11 (depends on 1)

Process according to claim 1, further comprising cladding the Al—Mn alloy on at least one side with an Al—Si brazing alloy optionally comprising up to 2.0% Zn.

### Claim 12 (depends on 1)

Process according to claim 1, further comprising cladding the Al—Mn alloy on at least one side with an Al—Si brazing alloy optionally comprising up to 2.0% Zn, and having a non-brazing liner alloys such as AA7072 or AA1145 or AA3005 or Al—Mn type alloys containing Zn in the range 0.5-5.0%.

### Claim 13 (depends on 1)

Process according to claim 1, further comprising cladding the Al—Mn alloy on at least one side with an Al—Si brazing alloy optionally comprising up to 2.0% Zn, and having a non-brazing liner alloys such as AA7072 or AA1145 or AA3005 or Al—Mn type alloys containing Zn in the range 0.5-2.5%.

### Claim 14 (depends on 1)

Process according to claim 1, further comprising V 0.05-0.25 wt. %.

### Claim 15 (depends on 1)

Process according to claim 1, wherein the sum of Cr, Zr, and V is 0.05-0.25 wt. %.

### Claim 16 (depends on 1)

Sheet produced according to claim 1, wherein the pre-braze elongation is at least 18%.

### Claim 17 (depends on 1)

Sheet produced according to claim 1, wherein the pre-braze elongation is at least 19%.

### Claim 18 (depends on 16)

Sheet according to claim 16, wherein the post-brazing tensile strength is at least 140 MPa.

### Claim 19 (depends on 16)

Sheet according to claim 16, wherein the post-brazing tensile strength is at least 150 MPa.

### Claim 20 (depends on 16)

Sheet according to claim 16, wherein the pre-braze n-value is at least 0.270.

### Claim 21 (depends on 16)

Sheet according to claim 16, wherein the post-braze coupon SWAAT lifetime, when tested according to ASTM G85 A3, is at least 15 days without perforation.

### Claim 22 (depends on 1)

Method of use of sheet produced according to claim 1, comprising combining the sheet as a core alloy with cladding to form a brazing sheet intended for manufacturing of components of tube-fin type heat exchangers such as radiators, heater cores and condensers.

### Claim 23 (depends on 1)

Method of use of sheet produced according to claim 1, comprising combining the sheet as a core alloy with cladding to form a brazing sheet intended for manufacturing of components of plate-fin type heat exchanger such as evaporator or oil cooler core plates or tanks of radiators or heater cores.

### Claim 24 (depends on 1)

Method of use of sheet produced according to claim 1, comprising combining the sheet as a core alloy with cladding to form brazing fin stock materials intended for manufacturing of components for heat exchangers.

### Claim 25 (depends on 16)

Brazing sheet comprising the sheet according to claim 16, as a core alloy combined with cladding to form a brazing sheet intended for manufacturing of components of tube-fin type heat exchangers such as radiators, heater cores and condensers.

### Claim 26 (depends on 16)

Brazing sheet comprising the sheet according to claim 16, as a core alloy combined with cladding to form a brazing sheet intended for manufacturing of components of plate-fin type heat exchanger such as evaporator or oil cooler core plates or tanks of radiators or heater cores.

### Claim 27 (depends on 16)

Brazing sheet comprising the sheet according to claim 16, as a core alloy combined with cladding to form brazing fin stock materials intended for manufacturing of components for heat exchangers.

### Claim 28 (depends on 1)

Process according to claim 1, wherein 0.72<Cu≦1.5.

### Claim 29 (depends on 1)

Process according to claim 1, wherein 0.80<Cu≦1.5.