Ferritic stainless steel alloy

Abstract

The application describes a lead-free ferritic stainless steel alloy having the following composition, all contents given in percent by weight: C ≦0.1 Si ≦2 Mn 0.1-2 S 0.08-0.4  Cr 16-25 Ni ≦2 Mo 1-5 Cu 0.01-3.0  Ca ≦0.006 Sn ≦0.15 B ≦0.02 X 0.01-0.5 and/or REM 0.01-1 the balance Fe as well as impurities, where X is 2 * Te + 1 * Se + 1 * Bi. The alloy has good machinability and good corrosion resistance, in comparison with the corresponding alloys containing lead.

1 . Ferritic stainless steel alloy characterized in that it has the following composition, all contents in percent by weight: 
     
       
         
               
               
               
             
                   
                   
               
                   
                 C 
                 ≦0.1 
               
                   
                 Si 
                 ≦2 
               
                   
                 Mn 
                 0.1-2   
               
                   
                 S 
                 0.08-0.4  
               
                   
                 Cr 
                 16-25 
               
                   
                 Ni 
                 ≦2 
               
                   
                 Mo 
                 1-5 
               
                   
                 Cu 
                 0.01-3.0  
               
                   
                 Ca 
                 ≦0.006 
               
                   
                 Sn 
                 ≦0.15 
               
                   
                 B 
                 ≦0.02 
               
                   
                 X 
                 0.01-0.5 and/or REM 0.01-1 
               
                   
                   
               
                   
                 the balance Fe as well as impurities, where X is 2 * Te + 1 * Se + 1 * Bi. 
               
           
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
     
   
   
       2 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the content of Cr is 18-22 weight-%, preferably 19-21 weight-%, and/or that the content of Ni is ≦1 weight-%, preferably ≦0.5 weight-%. 
   
   
       3 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the content of C is ≦0.05 weight-%, preferably ≦0.03 weight-%. 
   
   
       4 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the content of Mn is 0.2-1.5 weight-%, preferably 0.4-1.5 weight-%, and/or that the content of S is 0.1-0.4 weight %, preferably 0.15-0.35 weight-%. 
   
   
       5 . Ferritic stainless steel alloy according to  claim 4 , characterized in that the content of Ca is ≦0.002 weight-%, preferably ≦0.001 weight-%. 
   
   
       6 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the content of Si is ≦1 weight-%, preferably ≦0.5 weight-%, and/or that the content Mo is 1.5-2.5 weight-%, preferably 1.85-2.5 weight-%. 
   
   
       7 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the content of Cu is 0.5-2 weight-%, preferably 0.7-2 weight-%, and/or that the content of B is 0.0005-0.01, preferably 0.001-0.01 weight-%. 
   
   
       8 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the content of X, i.e., 2*Te+1*Se+1*Bi, is 0.02-0.4 weight-%, preferably 0.02-0.2 weight-%, and/or that the content of REM is 0.01-0.1 weight-%. 
   
   
       9 . Ferritic stainless steel alloy according to  claim 1 , characterized in that the impurities N, P and O are present in the following contents, all in percent by weight: 
     
       
         
               
               
               
             
                   
                   
               
                   
                 N 
                 ≦0.05 
               
                   
                 P 
                 ≦0.03 
               
                   
                 O 
                 ≦0.05