Appeal 2006-3308
Application 10/726,181
without the addition of grain refiners, formation of the detrimental fir tree
structure is avoided and it is possible to DC cast ingots at higher casting
speeds. Claim 19, the sole independent claim, is illustrative of the invention:
19. A method of producing an aluminum lithographic sheet
which method comprises:
a) providing a molten body of an aluminum alloy of
composition in wt%:
Si 0.05 - 0.20
Fe 0.25 - 0.40
Others up to 0.05 each and up to 0.15 total
A1 balance
wherein the aluminum alloy melt is prepared without the
addition of grain refiners,
b) optionally degassing the molten body,
c) direct chill (DC) casting the molten body to form a cast
ingot,
d) rolling the ingot to sheet,
e) electrograining the rolled sheet.
2
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