Non-oriented electromagnetic steel sheet with low iron loss after stress relief annealing, and core of motor or transformer

摘要

In a non-oriented electromagnetic steel sheet including about 0.01 wt% or less of C, about 1.0 wt% or less of Si, Mn in a range of about 0.1 wt% to 1.5 wt%, Al in a range of about 0.2 wt% to 1.5 wt%; the steel sheet having a critical amount of about 2 to 80 ppm rare earth metal, and the quantities of Ti and Zr in the steel sheet being limited to about 15 ppm or less of Ti, and about 80 ppm or less of Zr. The sheet exhibits excellent magnetic characteristics, such as iron loss, even when punched and laminated sheets are stress relief annealed at a low temperature for a short period of time.