| 摘要 |
PROBLEM TO BE SOLVED: To produce a clad fin material excellent in strength after brazing heating and sacrificial anode effect by specifying the thickness, cladding rate or the like in an Al alloy in which each compsn. of a core material and a brazing filler metal for cladding is prescribed. SOLUTION: In an Al alloy clad fin material in which both sides of a core material are clad with a brazing filler metal of an Al-Si alloy, the brazing filler metal is composed of an Al alloy composed of, by weight, 5 to 15% Si, and the balance Al with inevitable impurities. Furthermore, the core material is composed of an Al alloy contg. 0.01 to 1.6% Si, 0.4 to 2.0% Mn and 0.06 to 0.8% Fe, contg. one or more kinds from among 0.3 to 5.0% Zn, 0.005 to 0.3% In, 0.005 to 0.3% Sn and 0.005 to 0.3% Ga, and the balance Al with inevitable impurities. Moreover, the thickness (t) (mm) of the clad fin material is regulated to 0.04 to <1.0mm, the relation between the same and the average Si concn. Tsi (%) satisfies 7.3×Tsi-0.7×t<-1> -1.0>0 (where Tsi: 1.1 to 2.7), and the cladding rate of the brazing filler metal is regulated to 3 to 30% on the average per side.
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