Allegheny Ludlum Corporation

James A Salsgiver

Eugene W Bartel

Rowland C Rudolf, Iii

Tien-Hung Shen

Randal K Knipe

Carl P Stroble

A method and apparatus are provided for domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip by contacting the insulated steel surface to be scribed with a discharge electrode, providing a high voltage-low current and low voltage-high current to the electrode, moving the electrode across the steel while essentially maintaining contact therewith, and marking the steel with a plurality of indentations generally aligned across the steel surface by pulsing the high current to produce a plurality of electrical discharges.

Electrical discharge scribing for improving core loss of grain-oriented

A method is provided for domain refinement of electrical sheet products, such as grain-oriented silicon steel and amorphous magnetic materials, by subjecting at least one surface of the steel to an electron beam treatment to produce narrow substantially parallel bands of treated regions separated by untreated regions substantially transverse to the direction of strip manufacture to improve core loss without damaging the surface or any coating thereon.

Method for refining magnetic domains of electrical steels to reduce core

A method is provided for heat resistant domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip and amorphous magnetic materials by subjecting at least one surface of the steel to an electron beam treatment to produce permanent defects to effect domain refinement with narrow substantially parallel bands of treated regions separated by untreated regions substantially transverse to the direction of strip manufacture.

Method for providing heat resistant domain refinement of electrical

A method and apparatus are provided for domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip by contacting the insulated steel surface to be scribed with a discharge electrode, moving the electrode substantially transverse to the rolling directioln while essentially maintaining contact, and marking the steel with a plurality of electrical discharge craters generally aligned across the steel by producing a plurality of electrical discharges between the electrode and steel from a capacitor of 0.001-10.0 microfarads.

Capacitive electrical discharge scribing for improving core loss of

A method is provided for improving core loss of grain-oriented silicon steel by scribing the steel after cold rolling in a direction substantially transverse to the rolling direction by directing a pressurized liquid jet onto the steel surface to form selected spaced-apart scribe lines. The jet may contain solid particles which increase the scribing efficiency.

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Sarver, PA, United States of America

James A Salsgiver