Patent ID: 7732059

Claim:
A heat exchanger tithe having improved resistance to high burst pressures, said heat exchanger tube comprising an aluminum alloy that consists essentially of about 0.01-1.5% silicon, tip to about 1.2% copper, tip to about 2.0% manganese, about 0.01-1.0% iron, up to about 5.0% zinc, tip to about 0.35% titanium, and the balance substantially aluminum and incidental elements and impurities, wherein said heat exchanger tube is formed from an aluminum alloy feedstock, said feedstock being a strip, rod, or sheet having an aspect ratio ranging from about 1:1 to 500:1, said feedstock may be exposed to elevated temperatures greater than about 300° C., said feedstock having an average secondary dendrite arm spacing less than about 100 microns and having a cross sectional area of about 2500 mm 2 or less and having a yield strength ranging from about 50 to about 150 MPa, and wherein said feedstock is extruded using a continuous rotary extrusion process into an extrusion.