Use of a cr-a1 steel in laminated magnet cores

Abstract

Use, in laminated cores for electrical apparatuses and machines, which cores are to conduct electromagnetically induced magnetic alternating fluxes, of a thin plate of a ferritic stainless steel which besides Fe contains in weight-%, 10-30 Cr, 4-12 Al and Si from traces and up to max 0.7 Si.

1 . Use, in laminated cores for electrical apparatuses and machines, which cores are to conduct electromagnetically induced magnetic alternating fluxes, of a thin plate of a ferritic stainless steel which besides Fe contains in weight-%, 10-30 Cr, 4-12 Al and Si from traces and up to max 0.7 Si.  
     
     
         2 . Use according to  claim 1  in cores which are to conduct electromagnetically induced magnetic alternating fluxes having a frequency above 50 Hz, preferably above 400 Hz.  
     
     
         3 . Use according to  claim 1  or  2  of a thin sheet having a specific electric resistivity of at least 100 μΩ cm, preferably at least 120 μΩ cm.  
     
     
         4 . Use according to any one of claims  1 - 3  of a steel which contains 15-25 Cr.  
     
     
         5 . Use according to any one of claims  1 - 3  of a steel which contains more than 5 Al.  
     
     
         6 . Use according to any one of claims  1 - 4  of a steel which contains 15-25 Cr and 4.5-7 Al.  
     
     
         7 . Use according to  claim 6  of a steel which contains 18-24 Cr and 4.5-6 Al.  
     
     
         8 . Use according to any one of claims  1 - 4  of a steel which contains 18-22 Cr.  
     
     
         9 . Use according to  claim 8  of a steel which contains 5.2-5.8 Al.  
     
     
         10 . Use according to any one of claims  1 - 4  of a steel which contains 15-21 Cr and 7-12 Al.  
     
     
         11 . Use according to  claim 10  of a steel which contains 19-21 Cr and 8-12 Al.  
     
     
         12 . Use according to any one of claims  1 - 11  of a steel having a specific electric resistivity greater than 125 μΩ cm, which steel contains Al and Cr in contents not exceeding the frame of the area A, B, C, D, E, F, G, H, A in the coordinate system in the enclosed figure, which corner points A-H have the following coordinates:  
       
         
           
                 
                 
               
                     
                     
                 
                     
                     
                 
                     
                   % Al/% Cr 
                 
                     
                     
                 
                     
                 
                 
                 
                 
               
                     
                   A: 
                    12/30 
                 
                     
                   B: 
                    12/10 
                 
                     
                   C: 
                     7/10 
                 
                     
                   D 
                     7/18 
                 
                     
                   E 
                   4.5/18 
                 
                     
                   F 
                   4.5/26 
                 
                     
                   G 
                     4/26 
                 
                     
                   H 
                     4/30 
                 
                     
                     
                 
                     
                     
                 
             
                
                
                
                
               
               
                
               
            
             
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
     
     
         13 . Use according to any one of claims  1 - 12  of a steel which besides Fe, Cr, Al and optionally Si has a total content of max 2% other elements.  
     
     
         14 . Use according to  claim 13 , in which said other elements with a total content of max 2% comprise up to max 0.1 C and a total content of max 0.5 of Ce+La+Y+Hf+Sc+ and optionally other rare earth metals.