| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an aluminum alloy fin material for a heat exchanger, which has such a moderate strength before brazing as to be easily formed into a fin, further has high strength and high thermal conductivity (electroconductivity) after brazing, and is superior in sagging resistance, erosion resistance, self-corrosion resistance and a sacrificial anode effect; a manufacturing method therefor; and a method for manufacturing the heat exchanger using the fin material. <P>SOLUTION: The aluminum alloy fin material has a composition comprising 0.7 to 1.4 wt.% Si, 0.5 to 1.4 wt.% Fe, 0.7 to 1.4 wt.% Mn, 0.5 to 2.5 wt.% Zn, Mg as an impurity limited to 0.05 wt.% or less, and the balance Al with unavoidable impurities; and has a tensile strength of 130 MPa or higher, a yield strength of 45 MPa or higher, recrystallized grains with sizes of 500 μm or larger and an electroconductivity of 47% IACS or higher after brazing. The method for manufacturing the fin material comprises the steps of: producing a thin slab from a molten metal having the above composition with a twin-belt type continuous casting method; and sequentially cold-rolling, annealing, cold-rolling, annealing and cold-rolling the thin slab on a predetermined condition. The method for manufacturing the heat exchanger comprises the steps of: brazing the fin material by heating; and cooling it at a predetermined speed. <P>COPYRIGHT: (C)2008,JPO&INPIT |
