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Electrical Steel

Electrical Steel

Electrical steels play a vital role in the generation, transmission, distribution and use of electrical power and are one of the most important magnetic materials produced today.

There are three principle types

Grain oriented steels

These are  are 3% silicon-iron alloys developed with a grain orientation to provide very low power loss and high permeability in the rolling direction, for high efficiency transformers.

These materials are sold under the Unisil trademark. Unisil H is a high permeability grade which offers extremely low power loss.

Non oriented fully processed steels

These are iron-silicon alloys with varying silicon contents and have similar magnetic properties in all directions in the plan of the sheet. They are principally used for motors, generators, alternators, ballasts, small transformers and a variety of other electromagnetic applications.

A wide range of products, including a newly developed thin gauge material for high frequency applications, are available.

Non oriented semi processed steels

These are largely non silicon alloys sold in the not finally annealed condition to enhance punchability. Low power loss and good permeability properties are developed after final annealing of the laminations. These materials are sold under the Newcor and Polycor trademarks.

These products are available from Cogent Power Ltd, a wholly-owned subsidiary of Tata Steel. More information is available from


Cogent Power Ltd

Stephenson Street

Newport NP19 0RB

United Kingdom

T  +44 (0) 1633 290033

F  +44 (0) 1633 294542


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