	US 11,932,922 B2
	Strip of aluminium alloy for manufacturing brazed heat exchangers
Lionel Peguet, Quaix en Chartreuse (FR); and Bechir Chehab, Voiron (FR)
Assigned to CONSTELLIUM NEUF-BRISACH, (FR)
Appl. No. 17/436,003
Filed by CONSTELLIUM NEUF-BRISACH, Biesheim (FR)
PCT Filed Feb. 27, 2020, PCT No. PCT/FR2020/050389 § 371(c)(1), (2) Date Sep. 2, 2021, PCT Pub. No. WO2020/178507, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 1902177 (FR), filed on Mar. 4, 2019; and application No. 1902257 (FR), filed on Mar. 5, 2019.
Prior Publication US 2022/0145432 A1, May 12, 2022
Int. Cl. B23B 15/00 (2006.01); B23K 1/00 (2006.01); C21D 8/02 (2006.01); C22C 21/00 (2006.01); C22F 1/04 (2006.01); C23C 28/02 (2006.01); F28F 21/08 (2006.01)

CPC C22C 21/00 (2013.01) [B23K 1/0012 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0273 (2013.01); C22F 1/04 (2013.01); C23C 28/021 (2013.01); F28F 21/089 (2013.01)]

18 Claims

1. A strip intended for manufacture of brazed heat exchangers, having a core comprising an aluminium alloy with the composition in weight %:

Si: 0.10-0.30%

Fe<0.20%

Cu: 0.75-1.05%

Mn: 1.25-1.4%,

Mg<0.03%

Zn<0.1%

Ti<0.15%

other elements <0.05% each and <0.15% in total,

remainder aluminium;

the strip is cladded on one or two face(s) with a coverage alloy, wherein the coverage alloy is a brazing aluminium alloy or an alloy serving as a sacrificial anode to protect the part from corrosion;

the brazing alloy comprises in weight %:

Si: from 5 to 13%;

Fe: up to 1%;

Cu: up to 0.4%;

Mn: up to 0.2%;

Mg: up to 0.3%;

Zn: up to 0.2%;

Ti: up to 0.30%;

other elements: lower than 0.05% each and lower than 0.15% in total;

remainder aluminium;

the sacrificial anode is alloy AA7072.