| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high-strength nondirectional electromagnetic steel sheet high in strength and excellent in high frequency iron loss characteristics without impairing manufacturability, particularly rolling properties, and an advantageous manufacturing method. <P>SOLUTION: The method for manufacturing the nondirectional electromagnetic steel sheet includes heating a steel slab containing at most 0.01 mass% C, 1-4.5 mass% Si, 0.001-3.000 mass% Al and 0.02-3.0 mass% Mn, then carrying out hot rolling, hot-rolled plate annealing if necessary, carrying out cold rolling once or cold rolling twice or more with intermediate annealing in between to obtain a final sheet thickness, then carrying out finish annealing in a coil state. In the finish annealing, one or more kinds of metal elements selected out of Sn, Sb, Ti, Mn, Ni, V and Cr existing in the surface of the steel sheet are diffused inside the steel sheet. <P>COPYRIGHT: (C)2012,JPO&INPIT |
