Patent ID: 6428632
Filing Date: 2002-08-06
Classification: C22C

Abstract:
A nonoriented electromagnetic steel sheet having a small magnetic anisotropy in a high frequency zone and an excellent press formability comprising:C: not more than 0.0050 mass %; Si: 0.5-4.5 mass %; Mn: 0.1-2.5 mass %; Al: 0.2-2.5 mass %; and controlling S: not more than 0.01 mass %, wherein the sheet has magnetic properties in a rolling direction (L-direction), a direction perpendicular to the rolling direction (C-direction) and a direction inclined at an angle of 45Â° with respect to the rolling direction (D-direction) using an Epstein test piece, and wherein average iron loss in the L and C directions (W15/50(L+C)) in W/kg at 1.5 T and 50 Hz and average magnetic flux density in the L and C directions (B50(L+C)) in T at 5000 A/m satisfy the following equation (1): B50(L+C)&gE;0.03Â·W15/50(L+C)+1.63â€ƒâ€ƒ(1) and a ratio of iron loss in the D direction (W10/400 (D)) to average iron loss in the L and C directions (W10/400(L+C)) at 1.0 T and 400 Hz satisfies the following equation (2):W10/400(D)/W10/400(L+C)&lE;1.2â€ƒâ€ƒ(2).