| 摘要 |
PURPOSE:To provide a blank Al alloy plate for printing which has an excellent burning property and less decrease in mechanical strength after the burning treatment by controlling respectively the contents of Si, Fe, Cu and Ti and controlling the content of Si within the specific range according to the temp. of intermediate annealing. CONSTITUTION:A blank Al alloy for printing consists of <=0.25% Si, 0.05-1.0% Fe, <=0.03% Cu, <=0.10% Ti, <=0.03% Mg as an impurity and the balance Al and unavoidable impurities and satisfies the following conditions: The content of Si is controlled within the range satisfying the formula according to the temp. T( deg.C) of intermediate annealing. The blank Al alloy material having the above-described compsn. and an intermediate plate thickness is subjected to intermediate annealing for <=24hr at 300-500 deg.C in order to manufacture the blank Al alloy plate. The annealed material having the intermediate thickness is subjected to final cold rolling at 20-95% reduction ratio to obtain necessary mechanical strength, by which the intended blank Al alloy plate for printing is obtd.
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