ALUMINUM-ALLOY CLAD MATERIAL AND PRODUCTION METHOD THEREFOR, AND HEAT EXCHANGER USING SAID ALUMINUM-ALLOY CLAD MATERIAL AND PRODUCTION METHOD THEREFOR

摘要

A highly corrosion resistant and highly formable aluminum-alloy clad material, a method for producing the same, a heat exchanger using the same and a method for producing the same are shown. The present aluminum-alloy clad material has an aluminum alloy core material, an intermediate layer material clad on one surface of the core material and a brazing filler metal clad on the surface of the intermediate layer material that is not on the core material side, wherein a crystal grain size of the intermediate layer material before brazing heating is 60 μm or more, and in a cross section of the core material in a rolling direction before brazing heating, when R1 (μm) represents the crystal grain size in a plate thickness direction, and R2 (μm) represents the crystal grain size in the rolling direction, R1/R2 is 0.30 or less.

主权项

1. An aluminum-alloy clad material having an aluminum alloy core material, an intermediate layer material clad on one surface of the core material and a brazing filler metal clad on a surface of the intermediate layer material that is not on the core material side,
wherein the core material comprises an aluminum alloy comprising 0.05 to 1.50 mass % Si, 0.05 to 2.00 mass % Fe, 0.5 to 2.0 mass % Mn and a balance of Al and unavoidable impurities, the intermediate layer material comprises an aluminum alloy comprises 0.5 to 8.0 mass % Zn, 0.05 to 1.50 mass % Si, 0.05 to 2.00 mass % Fe and a balance of Al and unavoidable impurities, and the brazing filler metal comprises an aluminum alloy comprises 2.5 to 13.0 mass % Si, 0.05 to 1.20 mass % Fe and a balance of Al and unavoidable impurities, a crystal grain size of the intermediate layer material before brazing heating is 60 μm or more, and in a cross section of the core material in a rolling direction before brazing heating, R1/R2 is 0.30 or less, where R1 (μm) is the crystal grain size in a plate thickness direction, and R2 (μm) is the crystal grain size in the rolling direction.