| 摘要 |
PURPOSE: A non-oriented electrical steel sheet having superior magnetism and a method for manufacturing the same are provided to improve cleanliness of steel and magnetic properties of products by controlling steel constituents and properly controlling conditions such as an annealing temperature and reactive gas environment in the manufacturing process. CONSTITUTION: The non-oriented electrical steel sheet comprises 0.01 wt.% or less of C, 3.5 wt.% or less of Si, 1.2 wt.% or less of Mn, 1.3 wt.% or less of Al, 0.03 to 0.3 wt.% of Sn, 0.05 to 0.5 wt.% of Cr, 0.0005 to 0.0009 wt.% of Ti, 0.005 wt.% or less of N, 0.005 wt.% or less of O, 0.2 wt.% or less of a sum of elements Cu, Ni, Sb and Ca, and 0.1 wt.% or less of a sum of elements P, S, Mo, V, B, Zr, W, As, Mg, Te and Zn. The method for manufacturing the non-oriented electrical steel sheet comprises the processes of hot rolling the reheated slab after reheating the non-oriented electrical steel slab to a temperature of 1250 deg.C or less, winding the hot rolled slab in the ferrite temperature range of 600 deg.C or more, annealing or pickling free of annealing the hot rolled slab, cold rolling the slab to a final thickness, and annealing the cold rolled slab in the temperature range of (Ac1-150 deg.C) - Ac1 under the environment of 10 wt.% or more of hydrogen.
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