| 摘要 |
PURPOSE:To produce a high strength aluminum alloy fin material for forming capable of draw forming, drawless forming, or combined forming of them in spite of its small thickness and also to produce a sheet thereof. CONSTITUTION:An ingot of an Al alloy having a composition consisting of, by weight, <=0.1% Si, 0.10-1.0% Fe, 0.10-0.50% Mn, 0.01-0.15% Ti, and the balance Al with inevitable impurities is subjected to temp. rise and to heating up to 430-580 deg.C. Hot rolling is done by starting hot rolling while the temp. drop from the temp. at the completion of temp. rise and heating stays within 50 deg.C. Then, cold rolling is done so that draft at the final cold rolling is >=80%. The resulting sheet is subjected to refining annealing at 250-320 deg.C, by which intermetallic compounds of <=0.1mum diameter are distributed into a metallic structure by >=10pieces/mum<3> of number density.
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