US2003133825A1PendingUtilityA1

Composition and method of forming aluminum alloy foil

46
Priority: Jan 17, 2002Filed: Jan 17, 2002Published: Jul 17, 2003
Est. expiryJan 17, 2022(expired)· nominal 20-yr term from priority
Inventors:Tom DavissonSadashiv NadkarniDave Wilbur
C22C 21/02C22C 21/00
46
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Claims

Abstract

The present invention provides an aluminum alloy foil for fins used in heat exchangers. The aluminum alloy composition consists essentially of about 0.25% to about 0.6% by weight of Si; about 0.15% to about 0.50% by weight of Fe; about 0.20% to about 0.70% by weight of Mn; less than about 0.05% Cu; and less than about 0.05% Mg, with the balance aluminum including unavoidable impurities. The alloy composition may also contain less than 0.10% Zn or 0.50-2.00% Zn. The invention also provides a method for making an aluminum alloy wherein during cold rolling interanneal is carried out at a gauge such that the cold work after internanneal is between about 30-70%.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . An molten aluminum-based alloy consisting essentially of about 0.25% to about 0.60% by weight of Si; about 0.15% to about 0.50% by weight of Fe; about 0.20% to about 0.70% by weight of Mn; less than about 0.05% Cu; and less than about 0.05% Mg, with the balance aluminum including unavoidable impurities.  
     
     
         2 . The alloy of  claim 1 , wherein the alloy contains 0.10% by weight of Zn.  
     
     
         3 . The alloy of  claim 1 , wherein the alloy contains 0.50-2.00% by weight of Zn.  
     
     
         4 . The alloy of  claim 1 , wherein the alloy contains about 0.3-0.5% by weight of silicon.  
     
     
         5 . The alloy of  claim 1 , wherein the alloy contains about 0.15-0.35% by weight of iron.  
     
     
         6 . The alloy of  claim 1 , wherein the alloy contains about 0.30-0.60% by weight of manganese.  
     
     
         7 . The alloy of  claim 1 , wherein the alloy contains about 0.40-0.80% by weight of manganese and iron.  
     
     
         8 . The alloy of  claim 1  in the form of a cold rolled sheet, wherein during cold rolling interanneal is carried out at a gauge such that the cold work after interanneal is between 30-70%.  
     
     
         9 . An aluminum foil made in accordance with the process of  claim 12 .  
     
     
         10 . A heat exchanger having fins comprising an alloy having a composition in accordance with  claim 1 .  
     
     
         11 . A fin for a heat exchanger comprising an alloy having a composition in accordance with  claim 1 .  
     
     
         12 . A method for making an aluminum alloy foil, comprising: 
 providing a molten aluminum-based alloy consisting essentially of about 0.25% to about 0.60% by weight fo Si; about 0.20% to about 0.70% by weight of Fe; about 0.20% to about 0.70% by weight of Mn; less than about 0.05%Cu; and less than about 0.05% Mg, with the balance aluminum including unavoidable impurities;    continuously casting an aluminum alloy strip from said molten aluminum alloy; and cold rolling the continuously cast aluminum alloy strip to a final gauge of between about 0.002-0.008 inches.    
     
     
         13 . The method of  claim 12 , wherein during cold rolling interanneal is carried out at a gauge such that the cold work after interanneal is between 30-70%.  
     
     
         14 . The method of  claim 12 , wherein the alloy contains 0.10% by weight of Zn.  
     
     
         15 . The method of  claim 12 , wherein the alloy contains 0.50-2.00% by weight of Zn.  
     
     
         16 . The method of  claim 12 , wherein the alloy contains about 0.3-0.5% by weight of silicon.  
     
     
         17 . The method of  claim 12 , wherein the alloy contains about 0.15-0.35% by weight of iron.  
     
     
         18 . The method of  claim 12 , wherein the alloy contains about 0.30-0.60% by weight of manganese.  
     
     
         19 . The method of  claim 12 , wherein the alloy contains about 0.40-0.80% by weight of manganese plus iron.  
     
     
         20 . The method of  claim 12 , wherein during cold rolling interanneal is carried out at a gauge such that the cold work after interanneal is between about 30-70%.  
     
     
         21 . An aluminum foil made in accordance with the process of  claim 13 .  
     
     
         22 . A heat exchanger having fins comprising an alloy made in accordance with the process of  claim 13 .  
     
     
         23 . A fin for a heat exchanger comprising an alloy made in accordance with the process of  claim 13.

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