| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy material for a heat exchanger that the erosion of a brazer is suppressed at the time of brazing heating to have excellent corrosion-resistance and required strength. SOLUTION: This invention relates to a finish annealing material after the cold rolling of an Al alloy contg., by weight, 0.4 to 2.0% Fe, 0.3 to 2.0% Cu, 0.5 to 2.0% Mn, <0.03% (including 0%) Ti, and the balance Al with inevitable impurities, and the average grain size in the face rectangular to the rolling direction of the finish annealing material is <=40μm. Since Fe, Cu and Mn are contained in suitable amount, strength required for a heat exchanger core can be obtd., and, furthermore, by controlling the recrystallized grain size in the face rectangular to the rolling direction of the Al alloy to <=40μm, the Al alloy material is perfectly recrystallized at the time of brazing heating after its working into a refrigerant passage shaped body 1, and the erosion of a brazer can be suppressed. Moreover, by the incorporation of a suitable amt. of Ti, its corrosion resistance can be improved.
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