CRGO Silicon Steel

CRGO is the acronym for Cold Rolled Grain Oriented Steel. A material that is mainly used in the core of a transformer. When used it gives the transformers and other electrical devices a strong magnetic core.

The transformer core is constructed by combining thin CRGO sheets (also known as laminations). These laminations can be either wrapped around the coil or stacked. CRGO steel has high electrical resistivity and high magnetic properties in the rolling direction. It reduces core losses in transformers and increases corrosion resistance.

Oriented Silicon Steel

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. This can be explained as below

• 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.

Grain oriented silicon steel application case

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