| 摘要 |
Production of a high-strength electromagnetic steel sheet with a tensile strength as high as 500 MPa or greater, exhibiting not only wear resistance but also magnetic characteristics excelling in magnetic flux density and iron loss. There is provided a process for producing a high-strength electromagnetic steel sheet containing, by mass, 0.060% or less C, 0.2-6.5% Si, 0.05-3.0% Mn, 0.30% or less P, 0.040% or less S or Se, 2.50% or less Al and 0.020% or less N, optionally further containing at least one member selected from among 0.001-30.0% Cu and 0.03-8.0% Nb wherein a worked structure remains in the interior of the steel sheet, which process includes enlarging the average crystal grain diameter (D, µm) of the sheet just before the step of forming the worked structure finally remaining in the interior of the steel sheet to such an extent satisfying the relationship D=20 µm, preferably in the final working step, after application of a strain, avoiding such a heat treatment as that the worked structure is eliminated. Moreover, there is provided an electromagnetic steel sheet produced by the process. |
