US 12,454,741 B2
Aluminum alloy extruded multi-hole tube for heat exchanger and method for manufacturing the same
Taichi Suzuki, Tokyo (JP); Ryo Tomori, Tokyo (JP); and Hidetoshi Kumagai, Tokyo (JP)
Assigned to UACJ CORPORATION, Tokyo (JP)
Appl. No. 18/009,413
Filed by UACJ Corporation, Tokyo (JP)
PCT Filed Jun. 2, 2021, PCT No. PCT/JP2021/020946
§ 371(c)(1), (2) Date Dec. 9, 2022,
PCT Pub. No. WO2021/251227, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 2020-101474 (JP), filed on Jun. 11, 2020.
Prior Publication US 2023/0220521 A1, Jul. 13, 2023
Int. Cl. C22C 21/00 (2006.01); C22F 1/04 (2006.01)
CPC C22C 21/00 (2013.01) [C22F 1/04 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An aluminum alloy extruded multi-hole tube for a heat exchanger, the tube being formed of an aluminum alloy consisting of Mn of 1.20 to 1.80 mass % and Si of 0.40 to 0.70 mass %, optionally one or more selected from Ti of 0.10 mass % or less, and Cu of 0.05 mass % or less, with the balance being Al and inevitable impurities, the aluminum alloy having a ratio (Mn/Si) of Mn content to Si content being 2.6 to 3.0, wherein
strength change (tensile strength (A) of the aluminum alloy after heating test−tensile strength (B) of the aluminum alloy before heating test) in a heating test at 600° C.±10° C. for 3 minutes is −5 MPa or more.