| 摘要 |
An aluminum alloy fin material for a heat exchanger having suitable strength before brazing enabling easy fin formation, having high strength after brazing, having a high thermal conductivity (electrical conductivity) after brazing, and having superior sag resistance, erosion resistance, self corrosion prevention, and sacrificial anode effect, a method of production of the same, and a method of production of a heat exchanger using the fin material are provided, that is, an aluminum alloy fin material having a chemical composition of Si: 0.7 to 1.4 wt%, Fe: 0.5 to 1.4 wt%, Mn: 0.7 to 1.4 wt%, and Zn: 0.5 to 2.5 wt%, Mg as an impurity limited to 0.05 wt% or less, and the balance of unavoidable impurities and A1, and having a tensile strength after brazing of 130 MPa or more, a yield strength after brazing of 45 MPa or more, a recrystallized grain size after brazing of 500 µm or more, and an electrical conductivity after brazing of 47% IACS or more, a method of producing an aluminum alloy fin material comprising cold rolling/annealing/cold rolling/annealing/cold rolling a thin slab continuously cast by a twin-belt system from a melt of the above composition under predetermined conditions, and a method of production of a heat exchanger comprising cooling the fin material at a predetermined rate after brazing heating. |
