Method of producing grain oriented silicon steel sheets each hav

Details Method of producing grain oriented silicon steel sheets each hav Method of producing grain oriented silicon steel sheets each hav

1991-07-18

1992-07-14

Andrews, Melvyn J.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, 148122, 148111, 148254, 148537, C21D 812, C25F 324

Patent

active

051299658

ABSTRACT:
A method of producing grain oriented silicon steel sheets each having a low watt loss, at an inexpensive cost and a high operational efficiency, wherein surfaces of each silicon steel sheet are given a mirror surface is disclosed. After completion of a finish annealing, forsterite films on the surface of each grain oriented silicon steel sheet are removed therefrom, and thereafter, the silicon steel sheet is annealed within the temperature range of 1000.degree. C. or higher in an atmosphere composed of a mixture gas comprising 20 to 80% by volume of hydrogen gas and 0 to 80% by volume of an inert gas, whereby surfaces of the silicon steel sheet are given a mirror surface. Subsequently, tensile stress additive films are formed on the surfaces of the silicon steel sheet, and consequently, the resultant silicon steel sheet exhibits a remarkably reduced watt loss.

REFERENCES:
patent: 3856568 (1974-12-01), Tanaka et al.
patent: 4713123 (1987-12-01), Inokuti et al.

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