Aluminium oxide forming nickel based alloy

Abstract

Nickel based alloy intended for use at high temperatures wherein it comprises in percent by weight (wt-%) C 0.05-0.2 Si max 1.5 Mn max 0.5 Cr 15-20 Al 4-6 Fe 15-25 Co max 10 N 0.03-0.15 O max 0.5 one or more elements selected from the group consisting of Ta, Zr, Hf, Ti and Nb 0.25-2.2 one or more elements selected from the group consisting of REM max 0.5 balance Ni and normally occurring impurities.

1 . Dispersion strengthened nickel based alloy comprising in percent by weight (wt-%) 
       
         
           
                 
                 
               
                     
                 
                   C 
                   0.05-0.2  
                 
                   Si 
                   max 1.5 
                 
                   Mn 
                   max 0.5 
                 
                   Cr 
                   15-20 
                 
                   Al 
                   4-6 
                 
                   Fe 
                   15-25 
                 
                   Co 
                   max 10 
                 
                   N 
                   0.03-0.15 
                 
                   O 
                   max 0.5 
                 
                   one or more elements selected from the group consisting of 
                   0.25-2.2  
                 
                   Ta, Zr, Hf, Ti and Nb 
                 
                   one or more elements selected from the group consisting of 
                   max 0.5 
                 
                   REM 
                 
                   balance Ni and normally occurring impurities. 
                 
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         2 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 16-21.5 wt-% Fe. 
     
     
         3 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 17-20 wt-% Cr, preferably 17-19 wt-% Cr. 
     
     
         4 . Nickel based alloy according to  claim 1 , wherein the alloy comprises max 1 wt-% Si, preferably max 0.3 wt-% Si. 
     
     
         5 . Nickel based alloy according to  claim 1 , wherein the alloy comprises one or more elements selected from the group consisting of REM in a total content of 0.05-0.25 wt-%, preferably 0.05-0.25 wt-% Y. 
     
     
         6 . Nickel based alloy according to  claim 1 , wherein the alloy comprises one or more elements selected from the group consisting of Ta, Zr, Hf Ti and Nb in a total content of 0.3-1.5%, preferably 0.6-1.5%. 
     
     
         7 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 0.1-0.5 wt-% Hf. 
     
     
         8 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 0.05-0.35 wt-% Zr. 
     
     
         9 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 0.05-0.5 wt-% Ta. 
     
     
         10 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 0.05-0.4 wt-% Ti. 
     
     
         11 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 0.1-0.8 wt-% Nb. 
     
     
         12 . Nickel based alloy according to  claim 1 , wherein the alloy comprises >4-5.5 wt-% Al, preferably >4-5.2 wt-% Al. 
     
     
         13 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 200-2000 ppm O, preferably 400-1000 ppm O. 
     
     
         14 . Nickel based alloy according to  claim 1 , wherein the alloy comprises 52-62 wt-% Ni, preferably 52-60 wt-% Ni. 
     
     
         15 . Nickel based alloy according to  claim 1 , wherein the alloy is essentially free from carbides of the form M 7 C 3 , wherein M is a metal. 
     
     
         16 . Powder of a dispersion strengthened nickel based alloy comprising in percent by weight (wt-%)” 
       
         
           
                 
                 
               
                     
                 
                   C 
                   0.05-0.2  
                 
                   Si 
                   max 1.5 
                 
                   Mn 
                   max 0.5 
                 
                   Cr 
                   15-20 
                 
                   Al 
                   4-6 
                 
                   Fe 
                   15-25 
                 
                   Co 
                   max 10 
                 
                   N 
                   0.03-0.15 
                 
                   O 
                   max 0.5 
                 
                   one or more elements selected from the group consisting of 
                   0.25-2.2  
                 
                   Ta, Zr, Hf, Ti and Nb 
                 
                   one or more elements selected from the group consisting of 
                   max 0.5 
                 
                   REM 
                 
                   balance Ni and normally occurring impurities. 
                 
                     
                 
             
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         17 . Solid component comprising an aluminium oxide forming nickel based alloy wherein the nickel based alloy is compacted, such as by hot isostatic pressing or cold isostatic pressing, of a powder according to  claim 16 . 
     
     
         18 . Use of the nickel based alloy according to  claim 1 , in products in the form of tube, rod, strip, plate or wire. 
     
     
         19 . Use of the nickel based alloy according to  claim 1 , as construction material for heat treatment furnaces, in rollers for roller hearth furnaces, as muffle tubes for annealing in protective atmosphere, as construction material for heating elements, combustion chamber material in gas turbines, as gas-to-gas heat exchangers for example in the glass manufacturing industry or in gas turbines, as tubular reactors in high temperature processes, as transportation belts woven of wire intended for heat treatment furnaces, in radiation tubes for heating of heat treatment furnaces or as protection tubes for thermocouples.