Non-oriented electrical steel sheet having an excellent high-frequency iron loss property

Abstract

A non-oriented electrical steel sheet has a chemical composition that includes C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% as mass % and the remainder being Fe and inevitable impurities or a chemical composition containing C: not more than 0.005%, Si: 1.5-4%, Mn: 1.0-5%, P: not more than 0.1%, S: not more than 0.005%, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030% and further one or two of Ca: 0.0005-0.005% and Mg: 0.0002-0.005%, and is stably excellent in the high-frequency iron loss property even if a great amount of Mn is included.

1 - 5 . (canceled) 
     
     
         6 . A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.005 mass %, Si: 1.5-4 mass %, Mn: 1.0-5 mass %, P: not more than 0.1 mass %, S: not more than 0.005 mass %, Al: not more than 3 mass %, N: not more than 0.005 mass %, Bi: not more than 0.0030 mass % and the remainder being Fe and inevitable impurities. 
     
     
         7 . The non-oriented electrical steel sheet according to  claim 6 , further containing one or two of Ca: 0.0005-0.005 mass % and Mg: 0.0002-0.005 mass % in addition to the above chemical composition. 
     
     
         8 . The non-oriented electrical steel sheet according to  claim 6 , further containing one or two of Sb: 0.0005-0.05 mass % and Sn: 0.0005-0.05 mass % in addition to the above chemical composition. 
     
     
         9 . The non-oriented electrical steel sheet according to  claim 6 , further containing Mo: 0.0005-0.0030 mass % in addition to the above chemical composition. 
     
     
         10 . The non-oriented electrical steel sheet according to  claim 6 , further containing Ti: not more than 0.002 mass %. 
     
     
         11 . The non-oriented electrical steel sheet according to  claim 7 , further containing one or two of Sb: 0.0005-0.05 mass % and Sn: 0.0005-0.05 mass % in addition to the above chemical composition. 
     
     
         12 . The non-oriented electrical steel sheet according to  claim 7 , further containing Mo: 0.0005-0.0030 mass % in addition to the above chemical composition. 
     
     
         13 . The non-oriented electrical steel sheet according to  claim 8 , further containing Mo: 0.0005-0.0030 mass % in addition to the above chemical composition. 
     
     
         14 . The non-oriented electrical steel sheet according to  claim 11 , further containing Mo: 0.0005-0.0030 mass % in addition to the above chemical composition. 
     
     
         15 . The non-oriented electrical steel sheet according to  claim 7 , further containing Ti: not more than 0.002 mass %. 
     
     
         16 . The non-oriented electrical steel sheet according to  claim 8 , further containing Ti: not more than 0.002 mass %. 
     
     
         17 . The non-oriented electrical steel sheet according to  claim 11 , further containing Ti: not more than 0.002 mass %. 
     
     
         18 . The non-oriented electrical steel sheet according to  claim 9 , further containing Ti: not more than 0.002 mass %. 
     
     
         19 . The non-oriented electrical steel sheet according to  claim 12 , further containing Ti: not more than 0.002 mass %. 
     
     
         20 . The non-oriented electrical steel sheet according to  claim 13 , further containing Ti: not more than 0.002 mass %. 
     
     
         21 . The non-oriented electrical steel sheet according to  claim 14 , further containing Ti: not more than 0.002 mass %.