| abstract |
[PROBLEMS] To provide a thin wall of 35 to 50 μm, a small spring back during corrugating, an appropriate strength before brazing that facilitates fin forming, a high strength after brazing, erosion resistance, self-corrosion resistance, and sacrificial anode. An aluminum alloy fin material for heat exchangers with excellent effects and a method for producing the same. In mass%, Si: 0.9-1.2%, Fe: 0.8-1.1%, Mn: 1.1-1.4%, Zn: 0.9-1.1 %, Mg as impurities is 0.05% or less, Cu is 0.03% or less, and ([Si] + [Fe] +2 [Mn]) / 3 is limited to 1.4% to 1.6%. The balance is inevitable impurities and Al, the plate thickness is 35-50 μm, the tensile strength before brazing is 215 MPa or less, the solidus temperature is 620 ° C. or more, the tensile strength after brazing is 140 MPa or more, and the conductivity after brazing is 45% IACS or more. Fin material having a natural potential of -730 mV to -760 mV after application. A manufacturing method that defines hot rolling, cold rolling, intermediate annealing, and final cold rolling. [Selection figure] None |