Process for producing grain oriented electrical silicon steel sh

Details Process for producing grain oriented electrical silicon steel sh Process for producing grain oriented electrical silicon steel sh

1979-09-13

1980-09-30

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, H01F 104

Patent

active

042253667

ABSTRACT:
A grain oriented electrical silicon steel sheet containing aluminium and having an extremely high magnetic flux density, for example, a B8 of 1.90 or more, is produced by a secondary recrystallization annealing operation in which, during the period of elevating the temperature of a reducing atmosphere to a level within a range of from 850.degree. to 950.degree. C., the partial pressure of nitrogen in the reducing atmosphere is limited to 20% or less based on the entire pressure of the reducing atmosphere, and during the period of elevating the temperature of the reducing atmosphere in which the secondary recrystallization is in progress, the partial pressure of nitrogen is maintained at a level of at least 3%.

REFERENCES:
patent: 3764406 (1973-10-01), Littmann
patent: 3846187 (1974-11-01), Sakakura et al.
patent: 4030950 (1977-06-01), Shilling et al.
patent: 4118255 (1978-10-01), Barisoni et al.

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