FIELD: metallurgy.
SUBSTANCE: according to the present invention in the sheet subjected to treatment to crush the magnetic domains the areas of plastic deformation are created, they are arranged as per point sequence through width of the steel sheet, at that length d of each area of the plastic deformation is from 0.05 mm to 0.4 mm, and ratio (Σd/Σw) of sum Σd of lengths d to sum Σw of intervals w of each of said areas of the plastic deformations - in range from 0.2 to 0.6. Areas of the plastic deformation in sheet are created by means of the electronic beam action.
EFFECT: reduced noise level in transformer, and iron losses.
3 cl, 2 ex, 2 tbl, 4 dwg
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