The invention relates to a process to manufacture a clad strip, preferably <1.5
mm thick, intended for 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 the plate between 550 and 630 C. for at least one hour,
- cladding one or two sides of the plate with a brazing aluminum alloy,
preferentially containing 5 to 13% silicon,
- hot rolling followed by cold rolling of the plate to a thickness close
to a final desired thickness,
- recrystallization annealing of the strip between 300 and 4000 C.,
- strain hardening of the annealed strip to obtain a permanent deformation
between 2 and 10% and to obtain the desired final thickness.
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