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GNEE'S Cold Rolled Grain Oriented Steel Coil

Cold Rolled Grain Oriented (CRGO) silicon steels are used for laminations of the Power Transformers. Cold Rolled Grain Oriented (CRGO) sheets will have superior magnetic properties in the direction of rolling. The crystals are aligned in the direction by cold rolling followed by heat treatment process.

Properties of CRGO Steel

It is a soft magnetic material and has the following properties:

High magnetic permeability.

Reduced magnetostriction.

High resistivity.

High stacking or laminating factor allows compact core designs.

Low losses.

Grades of CRGO Steel

The early grades of steel were known as M7(0.7watts /lb at 1.5T/60Hz) and M6(.6watts/lb at 1.5T/60Hz).

Similarly, M5 M4 and M3 grades were developed in the late sixties.

A new material called Hi-B has a remarkable degree of orientation and is 2 – 3 grade better than conventional CRGO steel products.

Application of CRGO Silicon Steel as Transformer Core

CRGO grade steel mainly finds applications as core material for power transformers and distribution transformers.

High magnetic permeability leads to low excitation currents and lower inductions.

Low hysteresis and eddy current losses.

Excellent lamination factor leads to better and compact designs and hence low material required.

High knee saturation characteristics.

Very low level of magnetostriction leads to noise reduction.

Enhances ease of winding and improves productivity.