| 摘要 |
PROBLEM TO BE SOLVED: To provide a high silicon steel sheet excellent in surface properties and workability and suitable as an iron core material for electric apparatus such as transformer and motor. SOLUTION: In the method by which a base metal steel sheet containing <4 wt.% Si is subjected to heating treatment, siliconizing treatment, diffusion soaking treatment and cooling treatment in succession to produce a high silicon steel sheet, the having treatment is performed in an atmosphere satisfying the following inequality and at the temperature rising rate of >=50 deg.C/min at a temp of >=500 deg.C. [O2]×[H2O]1/4<=70, wherein [O2] is the concentration (ppm) of oxygen, and [H2O] is the concentration (ppm) of water vapor.
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