| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an aluminum alloy fin material for a heat exchanger which has suitable strength before brazing, has excellent strength, thermal conductivity and erosion resistance after brazing, and can reduce die wear upon forming in particular, to provide a method for producing the same, and to provide a heat exchanger. <P>SOLUTION: The aluminum alloy fin material has a chemical composition comprising, by mass, 0.8 to 1.0% Si, 1.1 to 1.4% Fe, 0.6 to 0.7% Mn and 0.5 to 0.9% Zn; wherein Fe+Mn:≤2.0%, and the balance Al with inevitable impurities in which Mg:≤0.05%, and has a solidus temperature of≥620°C, and in which, in a state after brazing, proof stress is≥40 MPa, electric conductivity is≥49.5 IACS, natural potential is≤-740 mV and the number per unit area of the second phase grains with an equivalent circle diameter of≥1μm observed in the metallic structure is≤6,000 pieces/mm<SP>2</SP>. A molten metal having the above chemical composition is continuously cast by a twin belt type casting machine, and is subjected to cold rolling including process annealing, so as to be a final sheet thickness of 40 to 200μm. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
