Process by producing an aluminium alloy brazing sheet, aluminium alloy brazing sheet

Abstract

Disclosed is a process for producing an Al—Mn alloy sheet with improved liquid film migration resistance when used as core alloy in brazing sheet, including the steps of: casting an ingot having a composition comprising (in weight percent): 0.5<Mn≦1.7, 0.06<Cu≦1.5, Si≦1.3, Mg≦0.25, Ti<0.2, Zn≦2.0, Fe≦0.5, at least one element of the group of elements of 0.05<Zr≦0.25 and 0.05<Cr≦0.25; other elements <0.05 each and total <0.20, balance Al; homogenisation and preheat; hot rolling; cold rolling (including intermediate anneals whenever required), and wherein the homogenisation temperature is at least 450° C. for a duration of at least 1 hour followed by an air cooling at a rate of at least 20° C./h and wherein the pre-heat temperature is at least 400° C. for at least 0.5 hour.

Dependencies are inferred from the claim text.