AMENDED CLAIMS PCT/US2005/034707
[Received by the International Bureau on 03 April 2006 (03.04.2006): original claims 1-29 replaced by amended claims 1-29]
1. A bilayer heat exchanger material comprising a braze layer and a core layer consisting essentially of an aluminum 3xxx series alloy including Mg in an amount from about 0.19 to about 0.339 weight % sufficient to increase core erosion/corrosion resistance, at least one dispersoid forming element selected from the group consisting of Mn, Cr, Zr and V, optionally Si, optionally Fe, optionally Cu, and optionally at least one selected from the group consisting of Ti, Zn, and Ni.
2. A material of claim 1 wherein said material has a yield strength of at least about 76 MPa.
3. A material of claim 1 wherein said material has a tensile strength of at least about 177 MPa.
4. A material of claim 1 that has been subjected to Controlled Atmosphere Brazing.
5. A material of claim 4 wherein said dispersoid forming element is selected from the group consisting of Mn, Cr, Zr, and combinations thereof.
6. A material of claim 5 wherein, said dispersoid forming element comprises between about 0.11 and 0.14 weight % Cr.
7. A material of claim 1 wherein said core layer comprises between about 1.0 and about 1.7 weight % Mn.
8. A material of claim 7 wherein said core layer further comprises about 0.12 weight % Cr.
9. A material of claim 1 wherein said core layer further comprises about 0.16 weight % V.
10. A material of claim 9 wherein said core layer further comprises about 0.1 weight % Si, about 0.26 weight % Fe, about 0.4S weight % Cu, about 1 ,5 weight % Mn, and about 0.11 weight % Cr,
11. A material of claim 1 wherein Mg is present in said core in an amount of from 0.19 to 0.23%.
12. A material of claim 1 wherein said core layer further comprises between about 0.40 and about 0.70 weight % Cu.
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13. A material of claim 1 wherein said core layer further comprises between about 0.03 and about 0.11 weight % Si.
14. A material of claim 1 wherein said core layer further comprises a metal selected from the group consisting of about 0.15 weight % Ti5 about 0.01 weight % Zn, about 0.01 weight % Ni, and combinations thereof.
15. A material of claim 1 wherein said braze layer is selected from the group consisting of AA 4343 and AA 4045 aluminum alloy.
16. A heat exchanger tube prepared from a material of claim 1.
17. A tube stock prepared from a material of claim 1. I S. A radiator lube prepared from a material of claim 1.
19. A condenser tube prepared from a material of claim 1.
20. An evaporator tube prepared from a material of claim 1.
21. A method of reducing erosion/corrosion associated with fluid velocity in the interior of a heat exchange tube comprising forming said tube from a material of claim 1.
22. A heat exchanger material of claim 1 wherein said core layer further comprises in weight percent based on the weight of the alloy:
Si 0.1 max,
Fe 0.2 max,
Cu 0,4 - 0.7,
Mn 1.4 - 1.7,
Cr 0.05 - 0.2,
Ti 0,2 max, and the balance aluminum and inevitable elements or impurities,
23. A bilayer heat exchanger material comprising a braze layer and a core layer comprising an aluminum 3xxx series alloy having about 0,57 weight % Mg sufficient to increase core erosion/corrosion resistance.
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4. Aa aluminum alloy suitable for use as a wrought product consisting essentially of up to about 0.11 weight % Si3 up to about 0,27 weight % Fe, between about 0.4 weight % and about 0.7 weight % Cu, between about 1.45 weight % and about 1.66 weight % Mn, between about 0.25 weight % and about 0.72 weight % Mg, up to about 0,14 weight % Cr3 up to about 0.15 weight % Ti, substantially 0 weight % Zr, up to about 0.16 weight % V, less than about 0.01 weight % Zn and Ni, and the balance aluminum and normal and/or inevitable elements and irnpurities.
25. An aluminum alloy according to claim 24 wherein said Cr is between about 0.11 weight % and 0.14 weight %,
26. Au aluminum alloy according to claim 24 wherein said V is about 0.158 weighi%.
27. A wrought aluminum alloy product consisting essentially of wo layers wherein a first layer comprises die alloy of claim 24 and a second layer comprises a brazing layer.
28. A product according to claim 27 wherein said product has a yield strength of at least about 76 Mpa.
29. A product according to claim 27 wherein said product has a, tensile strength of at least about 177.
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