TH76280A - Finstock high conductivity alloys Methods of production and product results - Google Patents

Abstract

DC60 (15/03/48) High conductivity finstock alloy for brazed aluminum heat exchangers. The finstock consists of an aluminum alloy containing approximately 0.7-1.2%Si, approximately 1.9-2.4%Fe, approximately 0.6-1.0%Mn, up to approximately 0.5%Mg, up to approximately 2.5%Zn, up to approximately 0.10%Ti, and up to approximately 0.05%In, with the remainder consisting of Al and acceptable impurities. The method of producing finstock from the above aluminum alloy involves continuous casting into strips with a thickness of approximately 2.10 mm at an average cooling rate of over approximately 300 °C/sec, and then cold rolling the strips multiple times with one or more central thin annealing at temperatures of approximately 300-450 °C. Fins made from the above finstock are exposed in brazed aluminum heat exchangers with cooling fins made from the above finstock. High-conductivity finstock alloy for welded-branch aluminum heat exchangers. The finstock consists of an aluminum alloy containing approximately 0.7-1.2%Si, approximately 1.9-2.4%Fe, approximately 0.6-1.0%Mn, up to approximately 0.5%Mg, up to approximately 2.5%Zn, up to approximately 0.10%Ti, and up to approximately 0.05%In, with the remainder consisting of Al and acceptable impurities. The method of producing finstock from the above aluminum alloy involves continuous casting into strips with a thickness of approximately 2.10 mm at an average cooling rate of over 300 °C/sec, and then multiple cold rolling of the strips using one or more central thin annealing treatments at temperatures of approximately 300-450 °C. Fins made from the above finstock are revealed in welded-branch aluminum heat exchangers with cooling fins made from it. The aforementioned finstock was also revealed.

Claims (28)

1. Finstock consists of an aluminum alloy containing approximately 0.7-1.2% Si, approximately 1.9-2.4% Fe, approximately 0.6-1.0% Mu, up to approximately 0.5% Mg, up to approximately 2.5% Zn, up to approximately 0.10% Ti, and up to approximately 0.05% In, with the remainder consisting of Al and acceptable impurities. 2. Finstock of Recollection 1 where the allowable impurities include at least one of the following elements up to approximately 0.2% Cu, up to approximately 0.2% Zr, up to approximately 0.05% Cr, and up to approximately 0.3% Ni, with the total impurity of all such allowable impurities not exceeding approximately 0.4%. 3. Finstock of claim 2 herein, whereby the allowable impurities are contained up to approximately 0.05% Cu, up to approximately 0.05% Zr, up to approximately 0.05% Cr, and up to approximately 0.05% Ni, with the total impurity of all such allowable impurities not exceeding approximately 0.10%. 4. Finstock of claim 2 in which the said aluminum alloy contains approximately 0.8-1.1%Si, approximately 2.0-2.2%Fe, approximately 0.6-0.8%Mn, up to approximately 1.5%Zn, up to approximately 0.20%Mg, up to approximately 0.05%Ti, and up to approximately 0.03%In. 5. Finstock of claim 4 where the allowable impurities are up to approximately 0.05% Cu, up to approximately 0.05% Zr, up to approximately 0.05% Cr, and up to approximately 0.05% Ni, with the total impurity of all such allowable impurities not exceeding approximately 0.10%. 6. The finstock of claim 1 includes post-branching electrical conductivity of approximately 48% LACS. 7. The finstock of claim 6 includes electrical conductivity after brazing of approximately 50% LASC. 8. The finstock of claim 6 includes an ultimate tensile strength after brazing of approximately 120 MPa. 9. The finstock of claim 8 includes an ultimate tensile strength after brazing of approximately 130 MPa. 10. The cream for the heat exchanger consists of aluminum alloy finstock containing approximately 0.7-1.2%Si, approximately 1.9-2.4%Fe, approximately 0.6-1.0%Mn, up to approximately 0.5%Mg, up to approximately 2.5%Zn, up to approximately 0.10%Ti, and up to approximately 0.05%In, with the remainder containing AI and acceptable impurities. 11. The provisions of claim 10 stipulate that the permissible impurities shall consist of at least one of the following elements up to approximately 0.2% Cu, up to approximately 0.2% Zr, up to approximately 0.05% Cr, and up to approximately 0.3% Ni, with the total impurity of all such permissible impurities not exceeding approximately 0.4%. 12. The basis of claim 11 is that the allowable impurities include up to approximately 0.05% Cu, up to approximately 0.05% Z, up to approximately 0.05% Cr, and up to approximately 0.05% Ni, with the total aggregate of all such allowable impurities not exceeding approximately 0.10%. 13. The fins of claim 11 state that the said aluminum alloy contains approximately 0.8-1.1%Si, approximately 2.0-2.2%Fe, approximately 0.6-0.8%Mu, up to approximately 1.5%Zn, up to approximately 0.20%Mg, up to approximately 0.05%Ti, and up to approximately 0.03%In. 14. A welded aluminum heat exchanger consists of at least one tank structured to hold the cooler; a header plate connected to at least one of the tanks; the header plate includes numerous channels; numerous parallel fluid passages, each tube extending significantly perpendicularly from one of the numerous channels in the header plate and structured to receive the cooler passing through it; and numerous fins arranged between these numerous fluid passages. These fins are in thermal contact with the numerous fluid passages and are structured to transfer heat away from the fins in order to cool the cooler as it circulates within the tubes. Much of this finstock consists of aluminum alloy finstock containing approximately 0.7-1.2%Si, approximately 1.9-2.4%Fe, approximately 0.6-1.0%Mn, up to approximately 0.5%Mg, up to approximately 2.5%Zn, up to approximately 0.10%Ti, and up to approximately 0.05%In, with the remainder consisting of Al and acceptable impurities. 15. Heat exchangers of claim 14 where the allowable impurities include at least one of the following elements up to approximately 0.2% Cu, up to approximately 0.2% Zr, up to approximately 0.05% Cr, and up to approximately 0.3% Ni, with the total impurity concentration of such allowable impurities not exceeding approximately 0.4%. 16. Heat exchangers of claim 15 where the allowable impurities include up to approximately 0.05% Cu, up to approximately 0.05% Zr, up to approximately 0.05% Cr, and up to approximately 0.05% Ni, with the total impurity concentration of all such allowable impurities not exceeding approximately 0.10%. 17. Heat exchangers of claim 15 in which the aluminum alloy contains approximately 0.8-1.1%Si, approximately 2.0-2.2%Fe, approximately 0.6-0.8%Mn, up to approximately 1.5%Zn, up to approximately 0.2%Mg, up to approximately 0.05%Ti, and up to approximately 0.03%In. 18. Method for producing aluminum alloy finstock from an alloy containing approximately 0.7-1.2%Si, approximately 1.9-2.4%Fe, approximately 0.6-1.0%Mn, up to approximately 0.5%Mg, up to approximately 2.5%Zn, up to 0.10%Ti, and up to approximately 0.05%In, with the remainder containing Al and acceptable impurities. The method consists of steps involving the preparation of a heat transfer system and a casting body. Such casting body has casting ends for casting the alloy strips. The alloy is cast into strips with a thickness of approximately 2-10 mm by controlled continuous casting with an average cooling rate exceeding approximately 300 °C/sec, while significantly avoiding the temperature in the heat transfer system, which would allow intermediate metals to fuse before exiting the casting ends, and simultaneously eliminating the formation of coarse eutectic centerline segregation; Cold rolling of the strip involves at least one pass through the strip to reach the first intermediate annealing size of approximately 1-4mm; a single intermediate annealing is applied to the strip for approximately 1-10 hours at a temperature of approximately 300-450°C; the strip is then cold rolled to the final intermediate annealing size of approximately 0.05-0.2mm; a final intermediate annealing is applied to the strip for approximately 1-10 hours at a temperature of approximately 300-450°C; and finally, the strip is cold rolled to its final size using a reduction of approximately 15-50%. 19. The methodology of claim 18 continues to include the procedure of partial annealing to the aforementioned final dimensions. Such partial annealing takes approximately 1-12 hours at a temperature of approximately 150-240°C. 20. The method of claim 18 includes at least one additional intermediate annealing step after cold reduction of at least 70% following the aforementioned first intermediate annealing step and before the aforementioned cold rolling step of the strip to the aforementioned final intermediate annealing size. Such additional intermediate annealing shall be performed at least once for 1-10 hours at a temperature of approximately 300-450°C. 21. The methodology of claim 20 further includes the application of at least one additional intermediate annealing treatment for approximately 1-6 hours at a temperature of approximately 330-400°C; 22. The method of claim 21 in which such size of the band at such intermediate-additional annealing is sufficient to allow subsequent cold reduction of at least approximately 70% to such final medium size. 23. Method of claim 18 in which the thickness of the formwork for such a strip, with the said procedure of casting the alloy into a strip, is approximately 5-9mm. 24. Method of claim 18 in which the procedure of applying the first intermediate annealing and the second intermediate annealing is carried out for 1-6 hours at a temperature between approximately 330-400 °C. 25. Method of claim 18 in which the cold rolling process of the strip to the final size uses a size reduction of approximately 15-35%. 26. Method of claim 18 where the permissible impurities within the Finstock alloy consist of at least one of the following elements up to approximately 0.2% Cu, up to approximately 0.2% Zr, up to approximately 0.05% Cr, and up to approximately 0.3% Ni, with the total amount of all such permissible impurities not exceeding approximately 0.4%. 27. The method of claim 26 in which such finstock is produced from an alloy containing approximately 0.8-1.1%Si, approximately 2.0-2.2%Fe, approximately 0.6-0.8%Mn, up to approximately 0.2%Mg, up to approximately 0.05%Ti, and up to approximately 0.03%In, with the remainder consisting of AI and acceptable impurities. 28. The method of claim 27 where the permissible impurities include up to approximately 0.05% Cu, up to approximately 0.05% Zr, up to approximately 0.05% Cr, and up to approximately 0.05% Ni, with the total impurity of all such permissible impurities not exceeding approximately 0.10%.