Method for producing grain-oriented electrical steel sheet with

Details Method for producing grain-oriented electrical steel sheet with Method for producing grain-oriented electrical steel sheet with

1988-09-16

1989-12-19

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148111, H01F 104

Patent

active

048880663

ABSTRACT:
A method of producing grain-oriented electrical steel sheet with a very high magnetic flux density, is characterized by increasing the partial pressure of the N.sub.2 in the annealing atmosphere at the intermediate stage between the start and the finish of the secondary recrystallization, and by ensuring the temperature differential in the coil does not exceed 100.degree. C. during changes to the annealing atmosphere. In addition, the rate of temperature increase at the hottest part of the coil is kept to a maximum of 13.degree. C./hr at least part of the time the coolest part of the coil is between 850.degree. C. and 1100.degree. C.

REFERENCES:
patent: 4225366 (1980-09-01), Harase et al.

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