Ferritic alloy

Abstract

A ferritic alloy comprising the following elements in weight % C 0.01 to 0.1; N: 0.001 to 0.1; 0: <0.2; Cr 4 to 15; Al 2 to 6; Si 0.5 to 3; Mn: ≤0.4; Mo+W≤4; Y≤1.0; Sc, Ce, La and/or Yb≤0.2; Zr≤0.40; RE≤3.0; balance Fe and normal occurring impurities and also fulfilling the following equation has to be fulfilled: 0.014≤(Al+0.5SQ (Cr+10Si+0.1)≤0.022.

1 . A ferritic alloy comprising the following elements in weight % (wt %):
 C 0.01 to 0.1;   N: 0.001 to 0.1;   O: 0.2;   Cr 4 to 15;   Al 2 to 6;   Si 0.5 to 3;   Mn: ≤0.4;   Mo+W≤4;   Y≤1.0;   Sc, Ce, La and/or Yb≤0.2;   Zr 0.40;   RE≤3.0;   balance Fe and normal occurring impurities, and   
       wherein the following equation has to be is fulfilled (elements in weight fraction):
   0.014≤(Al+0.5Si)(Cr+10Si+0.1)≤0.022.
 
 
     
     
         2 . The ferritic alloy according to  claim 1 , wherein (elements in weight fractions)
   0.015≤(Al+0.5Si)(Cr+10Si+0.1)≤0.021.
   
     
     
         3 . The ferritic alloy according to  claim 1 , wherein Zr is of from 0.05 to 0.40 weight %. 
     
     
         4 . The ferritic alloy according to  claim 1 , wherein Cr is of from 5 to 13 weight %. 
     
     
         5 . The ferritic alloy according to  claim 1 , wherein RE is more than 1.0 to 3.0 weight %. 
     
     
         6 . The ferritic alloy according to  claim 1 , wherein Al is of from 2.5 to 4.5 weight % or from 3 to 5 weight %. 
     
     
         7 . The ferritic alloy according to  claim 1 , wherein Al is of from 3 to 4 weight %. 
     
     
         8 . The ferritic alloy according to  claim 1 , wherein Si is of from 1.0 to 3 weight %. 
     
     
         9 . The ferritic alloy according to  claim 1 , wherein Si is of from 1.5 to 2.5 weight %. 
     
     
         10 . The ferritic alloy according to  claim 1 , wherein Zr is of from 0.10 to 0.35 weight %. 
     
     
         11 . The ferritic alloy according to  claim 1 , wherein the amount of C, N and Zr fulfills the following equation: 
       
         
           
             
               
                 - 
                 0.15 
               
               ≤ 
               
                 Zr 
                 - 
                 
                   
                     
                       4.7 
                        
                       C 
                     
                     + 
                     
                       4 
                        
                       
                           
                       
                        
                       N 
                     
                   
                   0.62 
                 
               
               ≤ 
               
                 0.15 
                 . 
               
             
           
         
       
     
     
         12 . A coating comprising the ferritic alloy according to  claim 1 . 
     
     
         13 . An object comprising the ferritic alloy according to  claim 1 . 
     
     
         14 . Use of the ferritic alloy according to  claim 1  for manufacturing a coating and/or a cladding and/or an object. 
     
     
         15 . Use of the ferritic alloy according to  claim 1  for manufacturing an object or a coating to be used in corrosive environments. 
     
     
         16 . Use of the ferritic alloy according to  claim 1  for manufacturing an object or a coating to be used in a furnace or as a heating element. 
     
     
         17 . Use of the ferritic alloy according to  claim 1  in environments wherein the ferritic alloy is exposed to salts, liquid lead and other metals, exposed to ash or high carbon content deposits, combustion atmospheres, atmospheres with low pO 2  and/or high N 2  and/or high carbon activity.