Patent ID: RE40788

Claim:
A litho strip for electrochemical roughening comprising a rolled aluminum alloy, said aluminum alloy comprising in addition to impurities resulting from manufacture: aluminium; 0.30-0.40% iron; 0.10-0.30% magnesium; 0.05-0.25% silicon; not more than 0.05% manganese; and not more than 0.04% copper; wherein: said litho strip has a rolling direction; said litho strip has a reversed bending fatigue strength perpendicular to said rolling direction, said reversed bending fatigue strength having a value greater than 1,250 cycles in a reversed bending test; and said litho strip has a surface, globulitic recrystallized grains, and a residual resistance ratio RR, said grains being disposed in said surface and having an average diameter of less than 50 microns, and said residual resistance ratio having a value in the range 10-20; and said litho strip, after test annealing at 240° C. for 10 minutes, has a tensile strength, Rm, greater than 145 N/mm 2 .