| 摘要 |
An aluminum alloy sheet for a lithographic printing plate includes 0.03 to 0.15% (mass %, hereinafter the same) of Si, 0.2 to 0.7% of Fe, 0.05 to 0.5% of Mg, 0.003 to 0.05% of 11, and 30 to 300 ppm of Ga, with the balance being aluminum and inevitable impurities, a surface area of the aluminum alloy sheet having an average recrystallized grain size of 50 μm or less in a direction perpendicular to a rolling direction, an Mg concentration that is higher than the average Mg concentration by a factor of 5 to 50, and a Ga concentration that is higher than the average Ga concentration by a factor of 2 to 20, the surface area being an area up to a depth of 0.2 μm from the surface of the aluminum alloy sheet.
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