Electrical steels

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 Corus. More information is available from www.cogent-power.com.