| 摘要 |
Provided is a process for production of a directional electromagnetic steel sheet from a primary recrystallization annealed steel sheet that is produced from a steel slab material containing, in mass%, C: 0.001-0.10%, Si: 1.0-5.0%, Mn: 0.01-0.5%, one or more elements selected from S and Se: 0.002-0.040%, sol.Al: 0.001-0.050%, and N: 0.0010-0.020%, the remainder being Fe and unavoidable impurities, and that is obtained subsequent to a nitriding treatment in an intermediate step for manufacturing the directional electromagnetic steel sheet, wherein nitriding is implemented such that the amount of nitrogen increase (ΔN) produced by the nitriding treatment is 1000 ppm or less, and the N intensity of fluorescence X-rays at the steel sheet surface is 0.59 or more, whereby uniform dispersion of nitrides as inhibitors in the direction of sheet thickness can be achieved in industrially consistent fashion, as a result of which it is possible to consistently manufacture directional electromagnetic steel sheets having good magnetic characteristics. |
