Thermostable and corrosion-resistant cast nickel-chromium alloy

Abstract

A nickel-chromium casting alloy comprising up to 0.8% of carbon, up to 1% of silicon, up to 0.2% of manganese, 15 to 40% of chromium, 0.5 to 13% of iron, 1.5 to 7% of aluminum, up to 2.5% of niobium, up to 1.5% of titanium, 0.01 to 0.4% of zirconium, up to 0.06% of nitrogen, up to 12% of cobalt, up to 5% of molybdenum, up to 6% of tungsten and from 0.01 to 0.1% of yttrium, remainder nickel, has a high resistance to carburization and oxidation even at temperatures of over 1130° C. in a carburizing and oxidizing atmosphere, as well as a high thermal stability, in particular creep rupture strength.

1 . A nickel-chromium casting alloy, comprising  
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   up to 0.8% 
                   of carbon 
                 
                     
                   up to 1% 
                   of silicon 
                 
                     
                   up to 0.2% 
                   of manganese 
                 
                     
                   15 to 40% 
                   of chromium 
                 
                     
                   0.5 to 13% 
                   of iron 
                 
                     
                   1.5 to 7% 
                   of aluminum 
                 
                     
                   up to 2.5% 
                   of niobium 
                 
                     
                   up to 1.5% 
                   of titanium 
                 
                     
                   0.01 to 0.4% 
                   of zirconium 
                 
                     
                   up to 0.06% 
                   of nitrogen 
                 
                     
                   up to 12% 
                   of cobalt 
                 
                     
                   up to 5% 
                   of molybdenum 
                 
                     
                   up to 6% 
                   of tungsten 
                 
                     
                   0.019 to 0.089% 
                   of yttrium 
                 
                     
                   remainder nickel. 
                 
                     
                     
                 
                     
                     
                 
             
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         2 . The nickel-chromium casting alloy as claimed in  claim 1 , comprising at most 0.7% of carbon, at most 1% of silicon, up to 0.2% of manganese, 18 to 30% of chromium, 0.5 to 12% of iron, 2.2 to 5% of aluminum, 0.4 to 1.6% of niobium, 0.01 to 0.6% of titanium, 0.01 to 0.15% of zirconium, at most 0.06% of nitrogen, at most 10% of cobalt, at least 3% of molybdenum and at most 5% of tungsten, individually or in combination with one another.  
     
     
         3 . The nickel-chromium casting alloy as claimed in  claim 1 , comprising at most 0.7% of carbon, at most 1% of silicon, up to 0.2% of manganese, 18 to 30% of chromium, 0.5 to 12% of iron, 2.2 to 5% of aluminum, 0.4 to 1.6% of niobium, 0.01 to 0.6% of titanium, 0.01 to 0.15% of zirconium, at most 0.06% of nitrogen, at most 10% of cobalt, up to 4% of molybdenum and at most 5% of tungsten, remainder nickel.  
     
     
         4 . The nickel-chromium casting alloy as claimed in  claim 1 , comprising at most 26.5% of chromium, at most 7% of iron, 3 to 6% of aluminum, over 0.15% of titanium, over 0.05% of zirconium, at least 0.2% of cobalt, up to 4% of molybdenum and over 0.05% of tungsten, individually or in combination with one another.  
     
     
         5 . The nickel-chromium casting alloy as claimed  claim 1 , wherein the aluminum and chromium contents satisfy the following condition:  
         9[% Al]≧[% Cr].  
     
     
         6 . The nickel-chromium alloy as claimed in  claim 1 , wherein a total content of nickel, chromium and aluminum ranges from 80 to 90%.  
     
     
         7 . (canceled)  
     
     
         8 . A method of using a nickel-chromium casting alloy as claimed in  claim 1  as a material for the manufacture of a furnace part, radiant tube for a heating furnace, roller for an annealing furnace, part of continuous-casting and strip-casting installations, hood and muffle for an annealing furnace, part of a large diesel engine, shaped body for a catalyst filling, and for cracking and reformer tubes.