| 摘要 |
PURPOSE: A non-oriented electrical steel having an excellent magnetism after SRA and a manufacturing method thereof are provided to secure an optimal grain diameter after SRA, and increase the fraction of a texture which is advantageous to magnetism, thereby improving the workability, and lowering the unit cost for production. CONSTITUTION: A non-oriented electrical steel having an excellent magnetism after SRA comprises 1.0 to 3.0 wt% of Al, 2.3 to 2.5 wt% of Si, 0.5 to 2.0 wt% of Mn, 0.001 to 0.004 wt% of N, 0.0005 to 0.004 wt% of S, the remnant Fe and other impurities which are inevitably mixed. Al, Mn, N and S are contained in order to satisfy all the conditions of (Al+Mn)Δ3.5, 0.002Δ(N+S)Δ0.006 and 300Δ(Al+Mn)/(N+S)Δ1,400. A grain diameter is more than 60 micrometers. The fraction of a cube texture is more than 3%. Al, Si and Mn is contained in order to satisfy the condition of 3.0Δ(Al+Si+Mn/2)Δ6.5. Al, Si and Mn is contained in order to satisfy the conditions of 0.3ΔAl/SiΔ1.3 and 1ΔAl/MnΔ8. |
