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.

A method for manufacturing a refrigerant guide tube of a heat exchanger and a refrigerant guide tube manufactured using the method and a heat exchanger with the refrigerant guide tube are disclosed. The refrigerant guide tube includes tube body and channels extending through a wall of the tube body. The tube body is formed by a butt joint of side edges of more than one bar-shaped plate materials along the length direction. The method allows forming the refrigerant channels of the guide tube before or during forming the tube body when the method is used to manufacture the guide tube, so as to avoid directly forming the channels on the tube body and make the process of manufacture the guide tube simpler and more convenient.

A structural component for a vehicle may include an extrusion that is extruded into a first state and then expanded into a second state. The extrusion in the first state has a reduced size relative to a desired final size. The extrusion in the first state is placed within a die that defines the desired final size. Pressurized water is distributed within internal cells of the extrusion in the first state such that the walls defining the internal cells are expanded into engagement with the surface of the die, thereby creating surface features or sealing interfaces with tight tolerances. The relative shape of the die and the extrusion in the first state defines an open space therebetween, into which the extrusion may expand to define the final shape. Some of the internal cells may be plugged such that they are not provided with pressurized water.

A flat tube includes a metal strip having a length. The metal strip includes longitudinal edges. The flat tube includes a first wall, a second wall parallel to the first wall, two complementary side wall portions joining said first and second walls together. The first wall includes a seam extending along the longitudinal axis of the flat tube so that juxtaposed longitudinal edges of the metal strip join together in parallel manner towards the second wall to form a closed profile of the tube. The seam includes a first section and a second section arranged in series. The sections being spaced apart from the second wall and extending along the seam. The second wall includes at least one deflection protruding towards the seam, so that the first section is in contact with the second wall whereas the second section remains spaced apart from the second wall.

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 testtensile 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.