| 摘要 |
PURPOSE:To improve the performance of a product by executing intermediate annealing of a stage for rolling Al having the purity of a specific value or above by heating in a specific range and at a prescribed cooling rate, then subjecting the Al to cold working at the draft of a specific value or above. CONSTITUTION:The intermediate annealing in the stage for rolling the Al slab having >=99.50% purity is executed by heating the same at 450-620 deg.C and cooling the same at >=50 deg.C/min cooling rate down to <=300 deg.C after the heating; thereafter, the slab is subjected to >=60% cold working. Since the strength at the time of heating is improved by this method, the speed of an etching line is increased and the performance of the product is improved.
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