| 摘要 |
An aluminum alloy fin material for heat exchangers, consisting of 0.5 to 1.5 mass% of Si; 0.1 to 1.0 mass% of Fe; 0.8 to 1.8 mass% of Mn; and 0.4 to 2,5 mass% of Zn, with the balance being Al and unavoidable impurities, wherein a metallographic microstructure before braze-heating is such that a density of second phase particles having a circle-equivalent diameter of less than 0.1 µm is less than 1×10 7 particles/mm 2 , and that a density of second phase particles having a circle-equivalent diameter of 0.1 µm or more is 5×10 4 particles/mm 2 or more, wherein a tensile strength before braze-heating, TS B (N/mm 2 ), a tensile strength after braze-heating, TS A (N/mm 2 ), and a sheet thickness of the fin material, t (µm), satisfy a relationship: 0.4 ‰¤ (TS B - TSA)/t ‰¤ 2.1, and wherein the sheet thickness is 150 µm or less; and a method of producing the same. |
