Patent ID: 6923876

Claim:
A process to manufacture a clad strip, suitable for use in the manufacture of brazed heat exchangers, comprising: casting a plate of core alloy comprising (% by weight): Si<0.8, Fe<0.8, Cu 0.2-0.9, Mn 0.7-1.5, Mg<0.4, Zn<0.2, Ti<0.1, other elements <0.05 each and <0.15 in total, the remainder aluminum, homogenizing said plate for at least one hour, cladding one or two sides of said plate with a brazing aluminum alloy, hot rolling followed by cold rolling of the plate to a thickness close to a desired final thickness, recrystallization annealing the strip to form an annealed strip, strain hardening the annealed strip to obtain a permanent deformation between 2 and 10% to obtain said desired final thickness.