Aluminum alloy with improved extrudability and corrosion resistance

Abstract

There is provided an extruded and brazed product with improved corrosion resistance by having low coarse recrystallized grain formation as well as a method for making same. The extruded and brazed product comprises an aluminum alloy comprising in weight percent Mn 0.6-0.75; Fe 0.11-0.16; Si 0.10-0.19; Cu<0.01; Zn<0.05; Ti<0.05; optionally a grain refiner; optionally Ni<0.01; and the balance being aluminum and inevitable impurities.

1 . An extruded and brazed product comprising:
 an aluminum alloy comprising in weight percent:
 Mn 0.6-0.75; 
 Fe 0.11-0.16; 
 Si 0.10-0.19; 
 Cu<0.01; 
 Zn<0.05; 
 Ti<0.05; 
 optionally a grain refiner; 
 optionally Ni<0.01; and 
 the balance being aluminum and inevitable impurities; 
   wherein less than 15% of a width of the extruded and brazed tube width product includes coarse recrystallized grains.   
     
     
         2 . The extruded and brazed product of  claim 1 , wherein each of the inevitable impurities is present at a maximum of 0.05 weight percent and the total inevitable impurities comprises less than 0.10 weight percent. 
     
     
         3 . The extruded and brazed product of  claim 1 , wherein the aluminum alloy comprises in weight percent: less than 0.01 Ni, less than 0.05 Mg, and/or less than 0.05 Cr. 
     
     
         4 . The extruded and brazed product of  claim 1 , wherein the aluminum alloy comprises in weight percent: Fe 0.13-0.16 and Si 0.13-0.191. 
     
     
         5 . (canceled) 
     
     
         6 . The extruded and brazed product of  claim 1 , wherein the aluminum alloy comprises in weight percent 0.64 to 0.72 Mn. 
     
     
         7 . The extruded and brazed product of  claim 1 , wherein the aluminum alloy comprises in weight percent 0.10 to 0.14 Si. 
     
     
         8 . The extruded and brazed product of  claim 1 , wherein the aluminum alloy comprises in weight percent 0.12 to 0.16 Fe. 
     
     
         9 . The extruded and brazed product of  claim 1 , wherein the aluminum alloy comprises in weight percent 0.011 to 0.024 Ti. 
     
     
         10 . The extruded and brazed product of  claim 1 , wherein the extruded and brazed product is an extruded and brazed tubing. 
     
     
         11 . The extruded and brazed product of  claim 10 , wherein the extruded and brazed tubing is or comprises micro-multiport tubing. 
     
     
         12 . A method for producing the extruded and brazed product of  claim 1  comprising:
 a) providing billets comprising an aluminum alloy comprising in weight percent:
 Mn 0.6-0.75; 
 Fe 0.11-0.16; 
 Si 0.10-0.19; 
 Cu<0.01; 
 Zn<0.05; 
 Ti  21  0.05; 
 optionally a grain refiner; 
 optionally Ni<0.01; and 
 the balance being aluminum and inevitable impurities; 
 
 b) homogenizing the billets with at least one heat treatment, the at least one heat treatment comprising a treatment temperature in the range of 540° C. to 590° C. for at least one soaking period from 1 to 8 hours to obtain an homogenized aluminum alloy; 
 c) extruding the billets to obtain an extruded product; and 
 d) brazing the extruded product to obtain the extruded and brazed product. 
 
     
     
         13 . The method of  claim 12 , further comprising, before providing the billets, casting the aluminum alloy into the billets. 
     
     
         14 . The method of  claim 12 , further comprising, after homogenizing and before extruding, cooling the billets. 
     
     
         15 . The method of  claim 12 , wherein each of the inevitable impurities of the aluminum alloy is present at a maximum of 0.03 weight percent and the total inevitable impurities comprises less than 0.10 weight percent. 
     
     
         16 . The method of  claim 12 , wherein the aluminum alloy comprises in weight percent Fe 0.13-0.16, Si 0.13-0.19, less than 0.01 Ni less than 0.05 Mg, and/or less than 0.05 Cr. 
     
     
         17 - 18 . (canceled) 
     
     
         19 . The method of  claim 12 , wherein the aluminum alloy comprises in weight percent 0.64 to 0.72 Mn. 
     
     
         20 . The method of  claim 12 , wherein the aluminum alloy in weight percent between 0.10 to 0.14 Si. 
     
     
         21 . The method of  claim 12 , wherein the aluminum alloy in weight percent between 0.12 to 0.16 Fe. 
     
     
         22 . The method of  claim 12 , wherein the aluminum alloy comprises in weight percent 0.011 to 0.024 Ti. 
     
     
         23 . The method of  claim 12 , wherein the extruded and brazed product is a tubing. 
     
     
         24 . The method of  claim 23 , wherein the tubing is a micro-multiport tubing. 
     
     
         25 . (canceled)