CRGO (Cold Rolled Grain Oriented) Transformer Lamination is a high-grade electrical steel specially designed for manufacturing the magnetic cores of transformers. The grain structure of the steel is oriented in the rolling direction to provide high magnetic permeability and low core loss, resulting in improved transformer efficiency.

CRGO sheets or coils are precision slit, cut and punched according to the required transformer core design. The laminations are assembled in layers, often using step-lap construction, to form the transformer core. A thin insulating coating on the steel surface helps minimize eddy-current losses and heating.

CRGO laminations offer low iron loss, low magnetizing current, high stacking factor, good dimensional accuracy and excellent magnetic performance. They are widely used in distribution transformers, power transformers, dry-type transformers, instrument transformers, reactors and other magnetic equipment.

Typical HS Codes: 7225.11 for grain-oriented electrical steel of width ≥600 mm and 7226.11 for width <600 mm. Finished transformer-core parts may fall under 8504.90, depending on their condition and customs classification.