Grain-Oriented silicon steel coil

Grain-oriented precision-cut coils

To be cut in accordance with the requirements of the clients

By Insulation & Cooling Medium – Coating Compatibility, to define transformer cores

Oil‑Immersed

Most common for power and distribution. GO requires insulation coatings resistant to hot transformer oil (thermal stability up to 120°C+), high interlaminar resistance, and hydrolysis resistance.

Dry‑Type

Air‑cooled, used indoors or in fire‑sensitive areas. Coatings must withstand higher temperatures (class F/H insulation) and, for open environments, enhanced corrosion protection. Low‑loss GO maintains efficiency without liquid cooling.

Common Coating Need

Both benefit from insulation coatings that preserve low core loss after stress‑relief annealing.

Core Manufacturing Excellence – From Coil to Core

The process from grain‑oriented silicon steel coil to core involves:

1. Slitting – Precision width cutting with controlled burr height.

2. Punching / Cutting – Step‑lap, mitered, or straight cuts with minimal magnetic degradation.

3. Stacking – Automated or manual, ensuring uniform stacking factor .

4. Annealing (if required) – Stress‑relief annealing restores magnetic properties after cutting; coating must survive this process.

5. Assembly & Clamping – Uniform pressure prevents lamination vibration and maintains low core loss.