Method for producing grain oriented magnetic steel sheet and...

Details Method for producing grain oriented magnetic steel sheet and... Method for producing grain oriented magnetic steel sheet and...

2003-10-27

2008-12-16

Sheehan, John P. (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S110000, C148S112000

Reexamination Certificate

active

07465361

ABSTRACT:
In a method for manufacturing a grain-oriented electrical steel sheet using steel containing less than 100 ppm of Al and 50 ppm or less each of N, S, and Se as a starting material, purification annealing is performed at 1050° C. or more, the partial pressure of hydrogen in the atmosphere being adjusted to 0.4 atm or less in a temperature range above 1170° C. for a purification annealing conducted at a temperature above 1170° C., or 0.8 atm or less in a temperature range of 1050° C. or more for a purification annealing conducted at a temperature of 1170° C. or less, to prevent deterioration of the bend properties due to the impurities.

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