| 摘要 |
PURPOSE:To provide a support for an aluminum alloy planographic printing plate fitted to electrochemical surface roughening treatment and having excellent strength and printability, by incorporating Mg, Fe, Ni and Ti as essential components in specific quantity. CONSTITUTION:A support for a planographic printing plate is prepared by a method wherein an aluminum alloy containing 0.30-3% of Mg, 0.15-0.50% of Fe, 0.005-0.30% of Ni and 0.01-0.10% of Ti as essential components and further containing Si, Cu and Mn respectively in quantity of 0.20% or less and other metal components respectively in quantity of 0.010% or less as impurities and comprising the remainder of Al is cast and subjected to homogenizing heat-treatment, hot rolling, cold rolling and process annealing and further subjected to finish cold rolling of a thickness reducing ratio of 30% or more. Mg enhances strength without exerting adverse effect on the surface roughening treatment of the support and printability and Fe enhances fatique resistant strength. Ni has a finely and uniformly precipitating property in Al in the form of an Al3Ni compound and Ti is added in order to finely pulverize the crystal particles of a cast ingot. |
