| 摘要 |
PURPOSE:To improve strength and surface accuracy, by subjecting a cast plate of Al alloy in which Mg and Be are specified and the amounts of Si, Fe, Mn, Cr, and Ti are limited to annealing under prescribed conditions prior to cold rolling. CONSTITUTION:The Al alloy containing, by weight, 3.5-5.5% Mg and 0.5-50ppm Be and also containing <=0.04% Si, <=0.64% Fe, <=0.2% Mn, 0.06% Cr, and <=0.006% Ti is cast to 4-10mm thickness. Then this cast plate is annealed at 380-480 deg.C for 1-24hr, followed by cold rolling.
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