Aluminum Alloy And Brazing Sheet Manufactured Therefrom

Abstract

An aluminum alloy for heat exchanger applications includes Al and unavoidable impurities, Mg in an amount from about 0.05 wt. % to about 0.40 wt. %, Cr in an amount from about 0.02 wt. % to about 0.50 wt. %, Zr in an amount from about 0.01 wt. % to about 0.35 wt. %, Ti in an amount from about 0.01 wt. % to about 0.25 wt. %, Si in an amount of less than about 0.15 wt. %, Cu in an amount from about 0.25 wt. % to about 0.8 wt. %, and Mn in an amount from about 1.0 wt. % to about 1.7 wt. %.

1 . An aluminum alloy for heat exchanger applications, comprising: 
 Al and unavoidable impurities;    Mg in an amount from about 0.05 wt. % to about 0.40 wt. %;    Cr in an amount from about 0.02 wt. % to about 0.50 wt. %;    Zr in an amount from about 0.01 wt. % to about 0.35 wt. %;    Ti in an amount from about 0.01 wt. % to about 0.25 wt. %;    Si in an amount of less than about 0.15 wt. %;    Cu in an amount from about 0.25 wt. % to about 0.8 wt. %; and    Mn in an amount from about 1.0 wt. % to about 1.7 wt. %.    
     
     
         2 . The aluminum alloy of  claim 1 , further comprising: 
 Mg in an amount from about 0.1 wt. % to about 0.35 wt. %;    Cr in an amount from about 0.05 wt. % to about 0.25 wt. %;    Zr in an amount from about 0.05 wt. % to about 0.25 wt. %; and    Ti in an amount from about 0.05 wt. % to about 0.2 wt. %.    
     
     
         3 . The aluminum alloy of  claim 2 , further comprising: 
 Mg in an amount of about 0.257 wt. %;    Cr in an amount of about 0.139 wt. %;    Zr in an amount of about 0.144 wt. %; and    Ti in an amount of about 0.147 wt. %.    
     
     
         4 . The aluminum alloy of  claim 1 , further comprising: 
 Fe in an amount of less than about 0.30 wt. %; and    Zn in an amount of less than about 0.1 wt. %.    
     
     
         5 . The aluminum alloy of  claim 1 , further comprising: 
 Cu in an amount from about 0.5 wt. % to about 0.8 wt. %; and    Mn in an amount from about 1.2 wt. % to about 1.7 wt. %.    
     
     
         6 . An aluminum alloy brazing sheet material comprising a core alloy and a clad alloy, the core alloy comprising: 
 Al and unavoidable impurities;    Mg in an amount from about 0.05 wt. % to about 0.40 wt. %;    Cr in an amount from about 0.02 wt. % to about 0.50 wt. %;    Zr in an amount from about 0.01 wt. % to about 0.35 wt. %;    Ti in an amount from about 0.01 wt. % to about 0.25 wt. %;    Si in an amount of less than about 0.15 wt. %;    Cu in an amount from about 0.25 wt. % to about 0.8 wt. %; and    Mn in an amount from about 1.0 wt. % to about 1.7 wt. %.    
     
     
         7 . The brazing sheet material of  claim 6 , wherein the core alloy further comprises: 
 Mg in an amount from about 0.1 wt. % to about 0.35 wt. %;    Cr in an amount from about 0.05 wt. % to about 0.25 wt. %;    Zr in an amount from about 0.05 wt. % to about 0.25 wt. %; and    Ti in an amount from about 0.05 wt. % to about 0.2 wt. %.    
     
     
         8 . The brazing sheet material of  claim 7 , wherein the core alloy further comprises: 
 Mg in an amount of about 0.257 wt. %;    Cr in an amount of about 0.139 wt. %;    Zr in an amount of about 0.144 wt. %; and    Ti in an amount of about 0.147 wt. %.    
     
     
         9 . The brazing sheet material of  claim 6 , wherein the core alloy further comprises: 
 Fe in an amount of less than about 0.30 wt. %; and    Zn in an amount of less than about 0.1 wt. %.    
     
     
         10 . The brazing sheet material of  claim 6 , wherein the core alloy further comprises: 
 Cu in an amount from about 0.5 wt. % to about 0.8 wt. %; and    Mn in an amount from about 1.2 wt. % to about 1.7 wt. %.    
     
     
         11 . The brazing sheet material of  claim 6 , wherein the material has a room temperature post-braze yield strength of at least 78 MPa.  
     
     
         12 . The brazing sheet material of  claim 6 , wherein the material has an average creep rate of less than 1×10 −8 /sec. at 260° C. under a stress of 6.0 Ksi.  
     
     
         13 . The brazing sheet material of  claim 6 , wherein the material has an average creep rate of less than 5×10 −8 /sec. at 260° C., under a stress of 6.0 Ksi.  
     
     
         14 . The brazing sheet material of  claim 6 , wherein the material has an average creep rate of less than 1×10 −7 /sec. at 260° C., under a stress of 6.0 Ksi.  
     
     
         15 . An aluminum alloy brazing sheet material comprising a core alloy and a clad alloy, the core alloy comprising: 
 Al and unavoidable impurities;    Mg in an amount from about 0.40 wt. % to about 0.80 wt. %;    Cr in an amount from about 0.02 wt. % to about 0.50 wt. %;    Zr in an amount from about 0.01 wt. % to about 0.35 wt. %;    Ti in an amount from about 0.01 wt. % to about 0.25 wt. %;    Si in an amount of less than about 0.15 wt. %;    Cu in an amount from about 0.25 wt. % to about 0.8 wt. %; and    Mn in an amount from about 1.0 wt. % to about 1.7 wt. %.    
     
     
         16 . The brazing sheet material of  claim 15 , wherein the core alloy further comprises: 
 Cr in an amount from about 0.05 wt. % to about 0.25 wt. %;    Zr in an amount from about 0.05 wt. % to about 0.25 wt. %; and    Ti in an amount from about 0.05 wt. % to about 0.2 wt. %.    
     
     
         17 . The brazing sheet material of  claim 15 , wherein the core alloy further comprises: 
 Fe in an amount of less than about 0.30 wt. %; and    Zn in an amount of less than about 0.1 wt. %.    
     
     
         18 . The brazing sheet material of  claim 15 , wherein the core alloy further comprises: 
 Cu in an amount from about 0.5 wt. % to about 0.8 wt. %; and    Mn in an amount from about 1.2 wt. % to about 1.7 wt. %.    
     
     
         19 . The brazing sheet material of  claim 15 , wherein the sheet has a room temperature post-braze yield strength of at least 94 MPa.  
     
     
         20 . The brazing sheet material of  claim 15 , wherein the material has an average creep rate of less than 5×10 −7 /sec. at 250° C., under a stress of 6.0 Ksi.