The invention concerns a rolled or extructed product, in particular a tube, made
of an alloy composition (expressed in wt. %) comprising: Si0.30; Fe 0.20-0.05;
Cu0.05; Mn 0.5-1.2; Mg0.05; Zn0.50; Cr 0.10-0.30; Ti0.05;
Zr0.05; the balance consisting of aluminium and unavoidable impurities. The
invention also concerns a method for making extruded tubes of said composition
comprising casting a billet, optionally homogenizing it, extruding a tube, drawing
said tube in one or several passes and continuous annealing at a temperature ranging
between 350 and 500 C. with a temperature increase of less than 10 seconds.
The inventive products are designed for pipes and heat exchangers for motor vehicles,
and exhibit good corrosion resistance.
