| 摘要 |
PURPOSE: A non-oriented electrical steel having an excellent magnetism after SRA and a manufacturing method thereof are provided to increase the fraction of a texture, which is advantageous to the growth of a grain and magnetism, at SRA treatment, thereby providing a high-end product having an excellent magnetism. CONSTITUTION: A non-oriented electrical steel having an excellent magnetism after SRA comprises 1.0 to 3.0 wt% of Al, 0.5 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, S and Si satisfy all the conditions of 1.5Δ(Al+Mn)Δ3.5, 0.002Δ(N+S)Δ0.006, 300Δ(Al+Mn)/(N+S)Δ1,400 and 0.6ΔAl/SiΔ4.0. The diameter of a grain is more than 60 micrometers. The fraction of a cube texture is more than 3%. Al, Si and Mn are contained in order to satisfy the condition of 1.7Δ(Al+Si+Mn/2)Δ5.5.
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