11 Facts About Electrical steel


Electrical steel is an iron alloy tailored to produce specific magnetic properties: small hysteresis area resulting in low power loss per cycle, low core loss, and high permeability.

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Electrical steel made without special processing to control crystal orientation, non-oriented steel, usually has a silicon level of 2 to 3.

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Grain-oriented Electrical steel is used in large power and distribution transformers and in certain audio output transformers.

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The mechanical properties of amorphous Electrical steel make stamping laminations for electric motors difficult.

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Electrical steel is usually coated to increase electrical resistance between laminations, reducing eddy currents, to provide resistance to corrosion or rust, and to act as a lubricant during die cutting.

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Magnetic properties of electrical steel are dependent on heat treatment, as increasing the average crystal size decreases the hysteresis loss.

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Electrical steel can be delivered in a semi-processed state so that, after punching the final shape, a final heat treatment can be applied to form the normally required 150-micrometer grain size.

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Fully processed electrical steel is usually delivered with an insulating coating, full heat treatment, and defined magnetic properties, for applications where punching does not significantly degrade the electrical steel properties.

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Magnetic properties of electrical steel are tested using the internationally standard Epstein frame method.

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Size of magnetic domains in sheet electrical steel can be reduced by scribing the surface of the sheet with a laser, or mechanically.

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Non-grain-oriented electrical steel is mainly used in rotating equipment, for example, electric motors, generators and over frequency and high-frequency converters.

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