| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid degradation of bend characteristic as the content of impurity elements, in particular, each content of S and Se is reduced to ≤ 50 ppm. <P>SOLUTION: In a grain oriented silicon steel sheet manufacturing method in which a steel slab having the composition consisting of < 100 ppm Al, and ≤ 50 ppm N, S and Se is hot-rolled, and subjected to at least two cold-rolling operations including one or intermediate annealing after the hot rolling, and then, subjected to decarburizing-annealing, secondary re-crystallization annealing, and further subjected to purification annealing, the purification annealing is performed in a temperature range of ≥ 1,050°C. If the purification annealing temperature exceeds 1,170°C, the hydrogen partial pressure of the atmosphere in the temperature range exceeding 1,170°C is adjusted to be ≤ 0.4 atm. If the purification annealing temperature is ≤ 1,170°C, the hydrogen partial pressure of the atmosphere in the temperature range of ≥ 1,050°C is adjusted to be ≤ 0.8 atm. <P>COPYRIGHT: (C)2004,JPO |
