Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1993-01-26
1995-05-02
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
21912117, 21912135, H01F 3006
Patent
active
054116040
ABSTRACT:
A grain oriented silicon steel sheet which exhibits reduced iron loss and which contributes excellent noise characteristics when used as a material of a stacked transformer. The sheet is produced by applying electron beam irradiation a finish-annealed grain oriented silicon steel sheet, along scan paths which cross the rolling direction at a scanning speed v(cm/s) and a spacing L(cm) in the rolling direction, with an electron beam of a beam diameter d (cm) generated by a current I.sub.b (mA) and acceleration voltage V.sub.k (kV);
wherein the surface energy density .alpha. (J/cm.sup.2) on the surface of said steel sheet as determined by the following formula (1) is about 0.16 J/cm.sup.2 or more, and said surface energy density .alpha. (J/cm.sup.2) and the surface energy density .beta. (J/cm.sup.2) on the scan paths meet the approximate condition of the following formula (3):
REFERENCES:
patent: 3076160 (1963-01-01), Daniels
patent: 4915750 (1990-04-01), Salsgiver et al.
patent: 4919733 (1990-04-01), Salsgiver et al.
patent: 5146063 (1992-09-01), Inokuti
Hina Eiji
Inokuti Yukio
Suzuki Kazuhiro
Kawasaki Steel Corporation
Miller Austin R.
Wyszomierski George
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