# US 9,751,143 B2 · Aluminum alloy brazing sheet for heat exchanger

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- Number: US 9,751,143 B2
- Document ID: US9751143B2
- Status: Granted
- Kind: B2
- Application number: 13/795,550
- Filed: 2013-03-12
- Published: 2013-10-03
- Granted: 2017-09-05
- Earliest claimed: 2012-03-30
- Assignees: Kobe Steel, Ltd.; Denso Corporation
- Applicants: Kobe Steel, Ltd.; Denso Corporation
- Inventors: Shimpei Kimura; Toshiki Ueda; Takahiro Izumi; Haruyuki Konishi; Hayaki Teramoto; Osamu Hakamata; Michiyasu Yamamoto
- Web page: https://patentgrep.com/patent/US9751143B2

## CPC

- B23K 1/0012: {Brazing of heat exchangers}
- B23K 1/0004: {Resistance soldering}
- B23K 35/0238: {layered}
- B32B 15/016: {all layers being formed of aluminium or aluminium alloys}
- C22C 21/00: Alloys based on aluminium
- F28F 21/089: {Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence)}
- Y10T 428/12764: Next to Al-base component
- 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
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An aluminum alloy brazing sheet for heat exchangers has a core, a sacrificial material formed on one side of the core, and a brazing filler metal formed on the other side of the core. The core is made of an aluminum alloy containing Si, Cu, Mn, and Al. The sacrificial material is made of an aluminum alloy containing Si, Zn, Mg, and Al. The brazing filler metal is made of an aluminum alloy. The aluminum alloy brazing sheet for heat exchangers has a work hardening exponent n of not less than 0.05. The core has an average crystal grain size of not more than 10 μm in a cross-section. The aluminum alloy brazing sheet for heat exchangers has excellent strength and corrosion resistance even when it is formed into a thin material and also has excellent high frequency weldability and weld cracking resistance during electric resistance welding.

## Claims

### Claim 1

An aluminum alloy brazing sheet for heat exchangers, comprising:
a core consisting of a first aluminum alloy comprising: Al, Si: from 0.1 to 1.0% by mass, Cu: from 0.5 to 1.2% by mass, and Mn: from 0.5 to 2.0% by mass;
a sacrificial material provided on one side of the core and made of a second aluminum alloy comprising: Al, Si: more than 0.2% by mass and not more than 0.8% by mass, Zn: more than 2.0% by mass and not more than 5.0% by mass, and Mg: from 1.0 to 4.5% by mass; and
a brazing filler metal provided on the other side of the core and made of a third aluminum alloy,
wherein
the aluminum alloy brazing sheet has a work hardening exponent n of from 0.05 to 0.21, and
the core has no clear crystal grain boundary.

### Claim 2 (depends on 1)

The aluminum alloy brazing sheet for heat exchangers according to claim 1, wherein the core further comprises at least one selected from the group consisting of: Ti: from 0.05 to 0.25% by mass, Cr: not more than 0.25% by mass, and Mg: from 0.05 to 0.5% by mass.

### Claim 3 (depends on 1)

The aluminum alloy brazing sheet for heat exchangers according to claim 1, wherein the aluminum alloy brazing sheet is obtained by a process comprising rolling the aluminum alloy brazing sheet in a finish cold rolling at a cold rolling ratio of more than 80% and not more than 97% without intermediate annealing.