| 摘要 |
PURPOSE:To obtain an aluminum alloy plate capable of providing even rough surface for offset printing by a method in which an Al alloy ingot containing specific amounts of Fe and Si is subjected to a soaking treatment followed by hot rolling, etc., and then to a cold rolling process of a specific reducing rate, and the Al plate is annealed at low temperature and roughened so as to give it a high fatigue strength and an even rough surface. CONSTITUTION:An aluminum alloy ingot composed of, besides Al, 0.15-0.1% Fe, 0.05-0.30% Si, and usual impurities is subjected to a soaking treatment at 450-600 deg.C for 3hr or more and then to hot rolling followed by cold rolling as needed, and the Al plate is subjected to an intermediate annealing to obtain a thickness of about 5mm. of Al plate. The Al plate is further subjected to a cold rolling of reducing rate of 70% or more into a thickness of about 0.3mm. and lastly annealed at a low temperature of 150-250 deg.C for 1-3hr in a batch furnace, etc., to obtain an objective Al alloy plate. In this case, the low-temperature annealing may be performed at 250-350 deg.C for 6-60sec. |
