Non-oriented electromagnetic steel sheet having reduced magnetic anisotropy in high frequency region and excellent press workability

摘要

According to the invention, a nonoriented electromagnetic steel sheet being small in the magnetic anisotropy in a high frequency zone and thus excellent in the magnetic properties as a rotating machine and having an excellent press formability such as punching property or the like can be obtained stably by adjusting a chemical composition of the oriented electromagnetic steel sheet to a given range, and establishing the following equation (1) between L, C average iron loss W15/50(L+C)[W/kg] and L, C average magnetic flux density B50(L+C)[T] with respect to measured values of magnetic properties using Epstein test pieces:and satisfying a ratio of D iron loss W10/400(D)[W/kg] to L, C average iron loss W10/400(L+C)[W/kg] by the following equation (2):and defining a hardness of the steel sheet in accordance with a sheet thickness and W15/50(L+C).