| 摘要 |
PROBLEM TO BE SOLVED: To provide an advantageous method for producing a grain-oriented silicon steel sheet in which various problems incidental to high temperature slab heating before hot rolling and high temperature purification annealing after secondary recrystallization which have been apprehended in the case of using inhibitors are advantageously evaded. SOLUTION: At the time of producing a grain-oriented silicon steel sheet, the content of Al as impurities in the steel is reduced to <100 ppm, moreover, the contents of Se, S, O and N are respectively reduced to <=30 ppm, and furthermore, after the completion of primary recrystallization, in the meanwhile, till the steel sheet temperature reaches 850 deg.C at the time of final finish annealing, the content of nitrogen in the steel is increased to >=30 ppm.
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