Method for producing an aluminum alloy composite material for a heat exchanger, and aluminum alloy composite material

Abstract

A method for producing an aluminum alloy composite material for a heat exchanger, which contains the steps of: homogenizing an aluminum alloy core alloy by keeping at 530° C. or more for 15 hours or more; fitting an Al—Si-series filler alloy on one side or on both sides of the core alloy; hot rolling; cold rolling; intermediate annealing, to completely recrystallize the core alloy; and giving a strain of 1 to 10%, wherein the aluminum alloy core alloy contains 0.01 to 1.0% by mass of Si, 0.1 to 2.0% by mass of Fe, 0.1 to 2.0% by mass of Cu, 0.5 to 2.0% by mass of Mn, and less than 0.2% by mass (including 0% by mass) of Ti, with the balance being Al and inevitable impurities; and an aluminum alloy composite material produced by the method.

1 . A method for producing an aluminum alloy composite material for a heat exchanger, comprising the steps of: 
 homogenizing an aluminum alloy core alloy by keeping the core alloy at 530C or more for 15 hours or more;    fitting an Al—Si-series filler alloy on one side or on both sides of the core alloy;    hot rolling the resultant fitted alloys;    cold rolling the hot rolled fitted alloys;    subjecting the cold rolled fitted alloys to an intermediate annealing so as to completely recrystallize the core alloy; and    giving a strain of 1 to 10% to the resultant alloys, wherein the aluminum alloy core alloy comprises 0.01 to 1.0% by mass (abbreviated to as % hereinafter) of Si, 0.1 to 2.0% of Fe, 0.1 to 2.0% of Cu, 0.5 to 2.0% of Mn, and less than 0.2% (including 0%) of Ti, with the balance being Al and inevitable impurities.    
     
     
         2 . The method according to  claim 1 , wherein the homogenizing step comprises keeping the core alloy at 530° C. or more for 2 hours or more, followed by cooling, in which the core alloy is kept for 1 hour or more at 500 to 560° C. in the course of the cooling, instead of keeping the core alloy at 530° C. or more for 15 hours or more.  
     
     
         3 . The method according to  claim 1  or  2 , wherein the intermediate annealing comprises keeping the cold rolled fitted alloys at 320 to 450° C. for 1 hour or more.  
     
     
         4 . The method according to  claim 1  or  2 , wherein the intermediate annealing comprises: heating the cold rolled fitted alloys at a heating speed of 30° C./minute or more; keeping said fitted alloys at 300 to 550° C. for 1 to 180 seconds; and then cooling the resultant alloys at a cooling speed of 30° C./minute or more.  
     
     
         5 . The method according to  claim 1  or  2 , further comprising a step of heat-treating after the step of giving the strain of 1 to 10%.  
     
     
         6 . The method according to  claim 5 , wherein said heat-treating after giving the strain of 1 to 10% comprises keeping at 200 to 380° C. for 1 hour or more.  
     
     
         7 . The method according to  claim 5 , wherein said heat-treating after giving the strain of 1 to 10% comprises the steps of: heating at a heating speed of 30° C./minute or more; keeping at 250 to 420° C. for 1 to 180 seconds; and then cooling at a cooling speed of 30° C./minute or more.  
     
     
         8 . An aluminum alloy composite material for a heat exchanger, which is produced by the method according to  claim 1  or  2 .