Strip or tube for the fabrication of brazed heat exchangers

摘要

A strip or spun tube, destined for the fabrication of brazed heat exchangers, is of an alloy with the composition (% by wt): (a) Si : 0.15 - 0.30; (b) Fe less than 0.25; (c) Cu : 0.6 - 1.1; (d) Mn : 1.0 - 1.4; (e) Mg : 0.1 - 0.4; (f) Zn less than 0.2; (g) Ti less than 0.1; (h) other elements less than 0.05 each and less than 0.15 in total; (i) the rest being aluminium; (j) with : Fe at most Si. Independent claims are also included for: (a) the fabrication of this alloy strip by casting a plate, hot rolling the plate, cold rolling to the desired thickness and restoration annealing at between 250 and 300oC; (b) the fabrication of this alloy strip by casting a plate, homogenisation of the plate between 590 and 630oC, hot rolling the homogenised plate, cold rolling to the desired thickness and restoration annealing at between 320 - 380oC.