| 摘要 |
PROBLEM TO BE SOLVED: To obtain a grain oriented silicon steel sheet, even in the case where a film containing no chromium is applied as a tension film, having high hygroscopic properties on a level same as that in the case where a chromium-containing film is formed.SOLUTION: Regarding the grain oriented silicon steel sheet in which the surface of a steel sheet is provided with a forsterite-based base film and a phosphate-based tension application film containing no chromium, the tension application film is formed by applying a phosphate-based coating treatment liquid containing no chromium to the surface of the forsterite-based base film containing Mn by 0.02 to 0.20 g/mexpressed in terms of weight and S by 0.01 to 0.10 g/mexpressed in terms of weight after final finish annealing and performing baking. |
