Metal treatment – Stock – Magnetic
Patent
1997-10-20
2000-07-04
Sheehan, John
Metal treatment
Stock
Magnetic
H01F 1147
Patent
active
060833262
ABSTRACT:
A grain-oriented electromagnetic steel sheet having a multiplicity of fine grains having a diameter of about 3 mm or less on the surface of the steel sheet, in a numerical ratio of about 65% or more and of about 98% or less relative to the constituting grains that penetrate the sheet along the direction parallel to its thickness, and a method for producing the same. The fine grains are artificially created and regularly disposed with a random orientation in the steel sheet, and contribute to decreasing the strain susceptibility of the steel. More preferably, a treatment for finely dividing magnetic domains is applied on the surface of the steel sheet. Transformers based upon the steel sheet have excellent magnetic characteristics (iron loss and magnetic flux density) together with strain resistance, and the steel sheet has good practical device characteristics (building factor) after being assembled into a transformer.
REFERENCES:
patent: 3636579 (1972-01-01), Sakakura et al.
patent: 4960652 (1990-10-01), Wada et al.
patent: 5223048 (1993-06-01), Inokuti
patent: 5718775 (1998-02-01), Komatsubara et al.
Journal of Applied Physics, "Development of Domain Refined Grain-Oriented Silicon Steel By Grooving", vol. 73, No. 10 PT. 02B, May 15, 1993, pp. 6609-6611.
Komatsubara Michiro
Senda Kunihiro
Takamiya Toshito
Kawasaki Steel Corporation
Miller Austin R.
Sheehan John
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