Method for making grain-oriented silicon steel sheet having exce

Details Method for making grain-oriented silicon steel sheet having exce Method for making grain-oriented silicon steel sheet having exce

1995-09-26

1997-04-15

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148111, H01F 104

Patent

active

056205333

ABSTRACT:
A method for producing a grain-oriented silicon steel sheet in the coil shape having high magnetic induction and including AlN and MnSe as principal inhibitors is disclosed. In a series of processes for producing a grain-oriented silicon steel sheet, the oxide content on the steel sheet surface is controlled within a range of about 0.02 to 0.10 g/m.sup.2 before the temperature elevation phase of a decarburization annealing process, and the ratio of the steam partial pressure to the hydrogen partial pressure is controlled within a range of about 0.2 to 0.65 at a steel sheet surface temperature ranging from about 500.degree. to 750.degree. C. during the temperature elevation phase in a decarburization annealing process. The method promotes stable secondary recrystallized grain formation even in different coils or at different places in the same coil, such that fluctuation of magnetic properties is depressed.

REFERENCES:
patent: 4200477 (1980-04-01), Datta et al.
patent: 4213804 (1980-07-01), Datta

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