Patent ID: 7442491

Claim:
An aluminum alloy blank for a lithographic printing plate made of a continuously cast flat-rolled aluminum alloy plate, the aluminum alloy blank for a lithographic printing plate comprising: iron in a range of 0.20 to 0.80 wt %; and the balance being aluminum, up to 0.05 wt % of titanium and/or up to 0.02 wt % of boron as a crystal grain refining element, and unavoidable impurity elements, wherein, the unavoidable impurity elements comprise silicone and copper, a content of silicon is in a range of 0.02 to 0.30 wt %, and a content of copper is equal to or below 0.05 wt %, and a solid solution amount of silicon is in a range of 150 ppm to 1500 ppm and a solution amount of iron is in a range of 300 ppm to 1300 ppm.