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

1979-06-11

1981-05-19

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148111, 14812A, 148 121, 148 16, H01F 104

Patent

active

042683262

ABSTRACT:
An electrical silicon steel sheet composed of secondary or tertiary recrystallized grains oriented in one or two directions, is produced by a process comprising a decarburization annealing operation in an oxidation atmosphere in which a ratio of PH.sub.2 O/PH.sub.2 wherein PH.sub.2 O represents a partial pressure of water vapor in said oxidation atmosphere and PH.sub.2 represents a partial pressure of hydrogen in said oxidation atmosphere, is adjusted to a value of 0.15 or more in an initial stage of said decarburization annealing operation and, then, to a value smaller than that in said initial stage in a final stage of said decarburization annealing operation.

REFERENCES:
patent: 3259526 (1966-07-01), Walker et al.
patent: 3287184 (1966-11-01), Koh
patent: 4046602 (1977-09-01), Stanley
patent: 4123298 (1978-10-01), Kohler

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