| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a low core loss grain oriented silicon steel sheet in which a uniform carbide-based film can be formed by a chemical vapor deposition process, further, even in the case heat treatment such as the baking of a tension-applying type coating and stress relieving annealing is performed to the surface of the film, not only excellent film adhesion can be maintained but also the uniformity of the film can be obtained. <P>SOLUTION: Regarding the production method, when a carbide-based film is formed on the surface of a grain oriented silicon steel sheet subjected to final finish annealing and free from an undercoat film by chemical vapor deposition treatment, the arithmetic mean roughness of the surface of the grain oriented silicon steel sheet is controlled to ≤0.3 μm, also, the concentration of carbon in the steel sheet is controlled to ≥ä12.9/t(steel sheet thickness: mm)} mass ppm, and, carbon is fed from the steel sheet, so as to perform chemical vapor deposition treatment to the surface of the steel sheet. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
