Aluminum Company of America

James R Weaver

Douglas A Granger

Elwin L Rooy

Raymond T Richter

Gerald R Petrey

H Gray Reavis, Jr

Stephen C Byrne

John Knox McBride

H Gray Reravis, Jr

Lithoplate and method for making same

An improved method of treating an ingot to be made into lithoplate. The method also includes (a) providing a non-heat treatable aluminum alloy containing magnesium; (b) homogenizing said alloy; (c) rolling said alloy to form a sheet or plate; (d) heating said sheet or plate for a temperature and time sufficient to permit magnesium to migrate to the surface of said metal; and (e) cold rolling said sheet or plate stock to a finished gauge workpiece.

Method for making lithoplate having improved grainability

An improved method of making a lithoplate from a 5XXX type alloy which includes controlling the composition and casting practices to eliminate forming a pine tree metal structure in an ingot used for rolling a workpiece to be made into lithoplate. The method also includes homogenizing and hot rolling the ingot at a controlled initial temperature to produce a desired grain and metal microstructure in the sheet rolled from the ingot which is suited for providing a surface having substantially uniform and evenly distributed craters produced by an electrochemical method of graining.

Method for making lithoplate

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Bettendorf, IA, United States of America

James R Weaver