| abstract |
An aluminum alloy fin material for heat exchanger that facilitates fin forming, having appropriate pre-brazing strength, and that after brazing, exhibits high strength and thermal conductivity (electric conductivity), excelling in sag-proof property, erosion resistance, self-corrosion resistance and sacrificial anode effect; a process for manufacturing the same; and a process for manufacturing a heat exchanger through use of the fin material. There is provided an aluminum alloy fin material 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, impurity Mg limited to 0.05 wt.% or less, and the balance unavoidable impurities and Al, which fin material after brazing has a tensile strength of 130 MPa or greater, a proof strength of 45 MPa or greater, a recrystallization grain diameter of 500 μm or more and an electric conductivity of 47% IACS or higher. Further, there is provided a process for manufacturing a fin material, including subjecting a thin slab obtained by twin-belt continuous casting of a molten metal of the above composition to cold rolling/annealing/cold rolling/annealing/cold rolling under given conditions. Still further, there is provided a process for manufacturing a heat exchanger, including brazing heating of the above fin material and thereafter cooling at a given rate. |