Electrical Silicon Steel Sheet & Coil (GO/NGO)
Electrical Silicon Steel Sheet & Coil
Grain-oriented (GO) and non-oriented (NGO) silicon steel with low core loss and high permeability for transformers, motors, generators and reactors.
Overview
MESCO supplies electrical silicon steel sheet and coil (also called electrical steel, lamination steel or transformer steel) for manufacturers of power and distribution transformers, electric motors, generators, reactors and magnetic cores. Silicon steel is a specialty cold rolled product alloyed with silicon to reduce electrical losses, increase permeability and lower magnetostriction — properties that directly determine the efficiency of electrical machines.
We supply both grain-oriented (GO) and non-oriented (NGO) electrical steel in a range of thicknesses, core losses and coating types, sourced from qualified mills and processed to your exact slitting and shearing requirements. With 19 years of steel expertise and international supply experience, MESCO supports electrical equipment manufacturers with consistent material performance and traceable mill certificates.
What Is Electrical Silicon Steel?
Electrical steel is a silicon-iron alloy with silicon content typically between 0.5% and 3.5%. Silicon improves the magnetic properties of iron by increasing electrical resistivity, which reduces eddy current losses, and by enhancing permeability, which improves magnetic flux handling. The steel is supplied in thin sheets or coils that are stacked and insulated to form transformer cores and motor laminations.
Two main families exist. Grain-oriented (GO) steel has a controlled crystal orientation that gives excellent magnetic properties in the rolling direction — ideal for transformer cores. Non-oriented (NGO) steel has more uniform magnetic properties in all directions, making it the standard choice for rotating machines such as motors and generators.
GO vs. NGO Electrical Steel
| Parameter | Grain-Oriented (GO) | Non-Oriented (NGO) |
|---|---|---|
| Typical grades | 23QG085, 27QG095, 30QG120 | 50W470, 50W600, 35W440 |
| Core loss (P1.5/50) | 0.85 - 1.20 W/kg | 3.0 - 5.5 W/kg |
| Magnetic direction | Optimized in rolling direction | Nearly isotropic |
| Thickness | 0.23 - 0.35 mm | 0.35 - 0.65 mm |
| Typical use | Power & distribution transformers | Motors, generators, small transformers |
Key Features & Benefits
- Low core loss: reduces energy losses and operating temperature in transformers and motors.
- High permeability: improves magnetic flux density and machine efficiency.
- Insulated surface coating: C-5 or C-6 coatings provide inter-lamination insulation.
- Precise thickness control: uniform gauge for consistent stacking and lamination.
- Slitting and shearing: we deliver in coils, slit widths or cut laminations to your drawing.
- Full traceability: each coil carries a mill certificate with magnetic test data.
Specifications & Customization
| Parameter | Range / Option |
|---|---|
| Type | GO (grain-oriented) / NGO (non-oriented) |
| Thickness | 0.20 - 0.65 mm |
| Core loss grade | 23QG085 - 30QG120 (GO); 35W440 - 50W600 (NGO) |
| Coating | C-5 (phosphate), C-6 (semi-organic), T2 (thin) |
| Coil width | 600 - 1250 mm; slitting from 20 mm |
| Delivery form | Full coil, slit coil, sheet, cut lamination |
For transformer and motor manufacturers we can supply pre-cut laminations with precision tooling, including E-I core shapes and motor stator-rotor profiles, subject to project review.
Applications
- Power transformers and distribution transformers
- Electric motor stators and rotors (AC, DC, servo)
- Generators and alternators
- Reactors, chokes and inductors
- Ballasts and magnetic shielding components
Quality Control
Incoming coils are verified against mill certificates for chemical composition, core loss (P1.5/50 or P1.7/50), permeability and coating insulation resistance. Thickness is checked across the strip width, and shearing/slitting burr height is controlled to protect the insulation coating. Every shipment includes a certificate with magnetic test values, and third-party testing by SGS or other laboratories can be arranged.
Why Choose MESCO?
- Reliable sourcing from qualified electrical steel mills
- Strict incoming inspection and magnetic data verification
- Precision slitting and shearing without damaging insulation
- 19 years of steel experience, 60+ export countries
- Technical support for core design and lamination processing
FAQ
What is the difference between GO and NGO electrical steel?
GO steel is grain-oriented for excellent magnetic properties in one direction, best for transformer cores. NGO steel has uniform properties in all directions and is used for motors and generators.
What coating types do you supply?
We supply C-5 (phosphate), C-6 (semi-organic) and thin T2 coatings for inter-lamination insulation.
Can you supply cut laminations?
Yes. Subject to project review, we can supply E-I core shapes and stator-rotor laminations cut to your drawing.
What thicknesses are available?
GO grades range from 0.23 to 0.35 mm; NGO grades from 0.35 to 0.65 mm.
Do you provide mill certificates?
Yes. Every coil is accompanied by a mill certificate with chemical and magnetic test data.
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