| 摘要 |
PROBLEM TO BE SOLVED: To provide an extruded flat perforated pipe for a heat exchanger having excellent corrosion resistance, which has sufficient strength and high corrosion resistance, and free from the occurrence of pickup on the surface even when being produced by high speed extrusion. SOLUTION: The extruded flat perforated pipe for the heat exchanger having excellent corrosion resistance is composed of an aluminum alloy having a composition containing, by mass, 0.01 to 0.3% Si, 0.01 to 0.3% Fe, 0.05 to 0.4% Cu, 0.05 to 0.3% Mn, 0.05 to 0.25% Zr and 0 to 0.15% Ti, and in which the total of Zr and Ti is≤0.3%, and the balance Al with inevitable impurities. As for grains with a grain area of≥1.0μm<SP>2</SP>dispersed into a matrix, the occupancy area ratio of an AlFeSi stable phase is 0.1 to <0.5%. COPYRIGHT: (C)2009,JPO&INPIT
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