| 摘要 |
According to the present invention, a high-strength electrical steel sheet that is suitable as rotor material for a high speed motor, steadily has high strength, and also has excellent magnetic properties can be obtained by setting the chemical composition thereof to include, by mass%, C: 0.005 % or less, Si: more than 3.5 % and 4.5 % or less, Mn: 0.01 % or more and 0.10 % or less, Al: 0.005 % or less, Ca: 0.0010 % or more and 0.0050 % or less, S: 0.0030 % or less, and N: 0.0030 % or less, Ca/S being 0.80 or more, the balance being Fe and incidental impurities, and by setting the sheet thickness to 0.40 mm or less, the non-recrystallized deformed microstructure to 10 % or more and 70 % or less, tensile strength (TS) to 600 MPa or more, and iron loss W 10/400 to 30 W/kg or less. |
