Patent ID: 9631879
Date: 2017-04-25
CPC Classifications: C22C,C22F,F28F

Claim:
1. An extruded or drawn tube for an aluminum alloy heat exchanger comprising an aluminum alloy composition consisting of, in weight percent, between 0.60 and 0.90 manganese, between 0.45 and 0.75 copper, between 0.05and 0.24 magnesium, less than 0.30 iron, less than 0.30 silicon, less than 0.05 titanium, less than 0.05 vanadium, other elements up to 0.05 each and up to 0.15 in total, and a Cu/Mg ratio higher or equal to 3; wherein the tube has a thickness of less than 1.5 mm; wherein the alloy when extruded into a tube has a breakthrough pressure of <18% higher than an AA3003 alloy extruded into an identical profile at the same billet temperature and ram speed.