Abstract: An aluminum alloy clad material for a heat exchanger comprises a cladding material on one side surface or both side surfaces of a core material, wherein the core material comprises: Mn at 0.50 to 1.80 mass %; and one or more types selected from Cu at more than 0.05 mass % and less than 0.20 mass % and Ti at 0.05 to 0.30 mass % with the balance being Al and inevitable impurities, and the cladding material comprises: Si at 3.00 to 10.00 mass %; Fe at 0.30 to 0.80 mass %; Mn at 0.30 to 1.80 mass %; and Zn at 1.00 to 5.00 mass % with the balance being Al and inevitable impurities, in which the total content of the Fe and the Mn is 2.10 mass % or less.

Abstract: A method of manufacturing an extruded, multi-hole-pipe (1) includes preparing an ingot having an aluminum alloy composition that contains one or more of Si: 2.0 mass % or less, Fe: 0.6 mass % or less, Cu: 0.6 mass % or less, Mn: 2.0 mass % or less, Mg: 0.4 mass % or less, Cr: 0.1 mass % or less, Zn: 1.5 mass % or less, Ti: 0.1 mass % or less, and B: 0.1 mass % or less. The total of the Si and Mn contents is 3.2 mass % or less, and the Si content is less than the Mn content. After performing a first homogenizing process at a temperature of 550° C. to 650° C. for 2 hours or more, a second homogenizing process is performed by holding the ingot at a temperature of 450° C. to 540° C. for 3 hours or more. Subsequently, the ingot is subjected to hot extrusion to form the multi-hole-pipe.

Abstract: An extruded, multi-hole pipe (1) has an aluminum alloy composition that contains Si: 0.30 mass % or more and 1.80 mass % or less, Cu: 0.10 mass % or more and 0.50 mass % or less, Mn: 0.30 mass % or more and 1.00 mass % or less, and Mg: 0.30 mass % or more and 1.00 mass % or less. The tensile strength of the extruded, multi-hole pipe (1) is 290 MPa or more.

Abstract: An aluminum alloy extruded multi-hole tube for a heat exchanger is formed of an aluminum alloy comprising Mn of 0.60 to 1.80 mass % and Si of more than 0.00 mass % and less than 0.20 mass %, with the balance being Al and inevitable impurities. The aluminum alloy has a ratio (Mn/Si) of the Mn content to the Si content being 15.0 or more. 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. The present invention can provide an aluminum alloy extruded multi-hole tube for a heat exchanger having excellent extrudability and high strength after brazing, and a method for manufacturing the same.

Abstract: An aluminum alloy extruded multi-hole tube for a heat exchanger is formed of an aluminum alloy comprising Mn of 0.60 to 1.80 mass % and Si of 0.20 to 0.70 mass %, with the balance being Al and inevitable impurities. The aluminum alloy has a ratio (Mn/Si) of the Mn content to the Si content being 2.6 to 4.0. Strength change (tensile strength (A) of the aluminum alloy after heating test?tensile strength (B) of the aluminum alloy before heating test) thereof in a heating test at 600° C.±10° C. for 3 minutes is ?5 MPa or more. The present invention can provide an aluminum alloy extruded multi-hole tube for a heat exchanger having excellent extrudability and high strength after brazing, and a method for manufacturing the same.