Low-iron loss grain oriented electromagnetic steel sheet and met

Details Low-iron loss grain oriented electromagnetic steel sheet and met Low-iron loss grain oriented electromagnetic steel sheet and met

1992-10-21

1995-02-28

Sheehan, John P.

Metal treatment

Stock

Magnetic

148308, 420117, H01F 104

Patent

active

053933559

ABSTRACT:
A low-iron loss grain oriented electromagnetic steel sheet subjected to final finishing annealing has a plurality of linear grooves formed on surface of the steel sheet in a direction across the rolling direction, so as to improve the magnetic characteristics of the steel sheet. The linear grooves have a substantially rectangular cross-sectional shape in which the angle of a groove side wall to the direction of the thickness of the sheet is about 60.degree. or less. Projections are present at a bottom portion of the groove, and the depth at the top of the projection at the groove bottom is at least about 1/2 of the maximum groove depth. The steel sheet maintains a low iron loss even after stress relief annealing. The present invention provides a method of stably producing the steel sheet.

REFERENCES:
patent: 3947296 (1976-03-01), Kumazawa
patent: 4904312 (1990-02-01), Beckley et al.

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