| abstract |
An aluminum alloy fin material comprises an aluminum alloy that has a composition comprising, in terms of % by mass, 1.2 to 2.0% of Mn, 0.5 to 1.3% of Si, 0.05 to 0.13% of Cu, 0.1 to 0.5% of Fe, 0.5 to 3.0% of Zn and a remainder made up by Al and unavoidable impurities, wherein crystal grains each having an equivalent circle diameter of 500 μm or more are present at a density of 10 to 200 grains/cm2 on the surface of the fin material that is not corrugated yet and 90% or more of the crystal grains has a texture that is longer in the rolling direction than in the width direction, the tensile strength is 200 to 250 MPa, the elongation is 1.0 to 5.0%, the tensile strength after a heat treatment corresponding to brazing which includes retaining at 600°C for 3 minutes is 140 MPa or more, and the corrosion weight loss after 16 weeks in a neutral salt spray test is 150 mg/dm2 or less. |