Abstract: An aluminum alloy brazing sheet has high strength, corrosion resistance and elongation, and includes an aluminum alloy clad material. The material includes a core material, one surface of which is clad with a sacrificial material and an other surface of which is clad with an Al—Si-based or Al—Si—Zn-based brazing filler metal. The core material has a composition containing 1.3 to 2.0% Mn, 0.6 to 1.3% Si, 0.1 to 0.5% Fe and 0.7 to 1.3% Cu, by mass, with the balance Al and impurities. The sacrificial material has a composition containing more than 4.0% to 8.0% Zn, 0.7 to 2.0% Mn, 0.3 to 1.0% Si, 0.3 to 1.0% Fe and 0.05 to 0.3% Ti, by mass, with the balance Al and impurities. At least the core material has a lamellar crystal grain structure. Elongation of material is at least 4% and a tensile strength after brazing is at least 170 MPa.

Abstract: A clad material for a cooler is provided by executing production of a tensile strain of 3 to 10% or rolling at a finish rolling ratio of 10 to 25%, and optionally performing a heat treatment for 1 to 8 hours at a temperature within a range from 150 to 400° C., on a clad raw material having a three layer structure of a core material, a first brazing filler metal layer that covers one side (the surface on the side of a cooling water passage) of this core material, and a second brazing filler metal layer that covers the other side (the surface on the opposite side from the cooling water passage). Specific ranges are prescribed for certain properties before and after brazing.

Abstract: An aluminum alloy heat exchanger with aluminum alloy tubes is provided by assembling and brazing. A coating which includes from 1 to 5 g/m2 of Si powder, from 3 to 20 g/m2 of Zn containing flux, and from 0.2 to 8.3 g/m2 of binder is formed on the aluminum alloy tubes. The fins contain Zn and 0.8 to 2.0% by mass of Mn, Si in a ratio of 1/2.5 to 1/3.5 relative to the Mn, and less than 0.30% by mass of Fe. A fillet is formed between the tube and the aluminum alloy fin after brazing, and a primary crystal portion is formed in the fillet. A eutectic crystal portion is formed in a portion other than the primary crystal portion, and the electric potential of the primary crystal portion is equal to or higher than the electric potential of the aluminum alloy fin.

Abstract: An aluminum alloy heat exchanger with aluminum alloy tubes is provided by assembling and brazing. A coating which includes from 1 to 5 g/m2 of Si powder, from 3 to 20 g/m2 of Zn containing flux, and from 0.2 to 8.3 g/m2 of binder is formed on the aluminum alloy tubes. The fins contain Zn and 0.8 to 2.0% by mass of Mn, Si in a ratio of 1/2.5 to 1/3.5 relative to the Mn, and less than 0.30% by mass of Fe. A fillet is formed between the tube and the aluminum alloy fin after brazing, and a primary crystal portion is formed in the fillet. A eutectic crystal portion is formed in a portion other than the primary crystal portion, and the electric potential of the primary crystal portion is equal to or higher than the electric potential of the aluminum alloy fin.

Abstract: An aluminum alloy heat exchanger with aluminum alloy tubes is provided by assembling and brazing. A coating which includes from 1 to 5 g/m2 of Si powder, from 3 to 20 g/m2 of Zn containing flux, and from 0.2 to 8.3 g/m2 of binder is formed on the aluminum alloy tubes. The fins contain Zn and 0.8 to 2.0% by mass of Mn, Si in a ratio of 1/2.5 to 1/3.5 relative to the Mn, and less than 0.30% by mass of Fe. A fillet is formed between the tube and the aluminum alloy fin after brazing, and a primary crystal portion is formed in the fillet. A eutectic crystal portion is formed in a portion other than the primary crystal portion, and the electric potential of the primary crystal portion is equal to or higher than the electric potential of the aluminum alloy fin.

Abstract: A heat exchanger has a clad thin sheet material, a clad thick sheet material that is disposed so as to define a passage between the clad thick sheet material and the clad thin sheet material, and that has a sheet thickness greater than that of the clad thin sheet material, and an inner fin held between the clad materials. The clad thick sheet material and the clad thin sheet material have Zn-containing brazing filler metal layers on their passage sides, respectively, and the post-brazing surface Zn amounts are set so as to satisfy specific conditions. Further, certain conditions concerning the compositions of each of the layers that constitute the clad materials, and the inner fin are set.

Abstract: A clad material for a cooler is provided by executing production of a tensile strain of 3 to 10% or rolling at a finish rolling ratio of 10 to 25%, and optionally performing a heat treatment for 1 to 8 hours at a temperature within a range from 150 to 400° C., on a clad raw material having a three layer structure of a core material, a first brazing filler metal layer that covers one side (the surface on the side of a cooling water passage) of this core material, and a second brazing filler metal layer that covers the other side (the surface on the opposite side from the cooling water passage). Specific ranges are prescribed for certain properties before and after brazing.

Abstract: An aluminum alloy heat exchanger formed by assembling and brazing an aluminum alloy tube and an aluminum alloy fin to each other, wherein a coating for brazing comprising 1 to 5 g/m2 of Si powder, 3 to 20 g/m2 of Zn containing flux, and 0.2 to 8.3 g/m2 of binder is formed on the surface of the aluminum alloy tube; the fin contains 0.8 to 2.0% by mass of Mn, Si in an amount of 1/2.5 to 1/3.5 of Mn content; less than 0.30% by mass of Fe, and Zn in an amount that is controlled in relation with the amount of the Zn containing flux in the coating for brazing to be in a region enclosed by points A, B, C, D, E, F of FIG.