| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy plate for a lithographic printing plate in which uniform pits are formed by electrochemical roughening treatment, and irregular roughening and streaks along a rolling direction are not formed on the surface after the roughening treatment, and to provide a production method therefor. SOLUTION: The aluminum alloy plate has a composition comprising 0.20 to 0.60% Fe, 0.03 to 0.15% Si, 0.025 to 0.050% Ti, 0.005 to 0.050% Ga, and 0.005 to 0.050% V, and the balance Al with impurities, and in which the content of Ni as the impurities is controlled to <0.005%, Pt to <0.0035%, and Cu to <0.005%. Preferably, the average crystal grain length in a direction orthogonal to the rolling direction viewed from the plate surface is 10 to 100μm, the average crystal grain length in a direction parallel to the rolling direction viewed from the plate surface is 2 to 20 times that in a direction orthogonal to the rolling direction, and also, precipitates with a diameter of 0.1 to 1μm are dispersed over the plate surface by 10,000 to 100,000 pieces/mm<SP>2</SP>. COPYRIGHT: (C)2004,JPO&NCIPI
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