Low Loss CRGO Steel Sheet 0.23mm 0.9W/kg For Transformer Core

 

• Minimal Eddy Current Losses: The 0.23 mm thickness is one of the thinnest commercially available for power and distribution transformers. It reduces circulating (eddy) currents and keeps no-load losses exceptionally low.
• Directional Magnetic Properties: The crystalline structure is aligned in the rolling direction, which provides maximum magnetic permeability and minimum reluctance along the magnetic path.
• High Resistivity: The added silicon increases the material's electrical resistance, effectively preventing localized internal heating and thermal degradation

 

 

Element	Typical Value	Role & Effect
Silicon (Si)	3.0 – 3.3%	Critical element: Increases electrical resistivity → reduces eddy current loss. Promotes Goss texture formation during final annealing.
Carbon (C)	≤ 0.06%	Low carbon prevents magnetic aging and long‑term core loss deterioration.
Manganese (Mn)	0.08 – 0.20%	Forms MnS precipitates – essential grain growth inhibitor for secondary recrystallization.
Phosphorus (P)	≤ 0.015%	Kept low to preserve ductility and magnetic permeability.
Sulfur (S)	0.003 – 0.035%	Part of inhibitor system; strictly controlled to very low residual levels.
Aluminum (Al)	0.01 – 0.05%	Forms AlN particles, working with MnS to control grain orientation.
Nitrogen (N)	0.003 – 0.012%	Synergizes with Al to establish optimal inhibitor distribution.
Iron (Fe)	Balance	High‑purity matrix with precisely aligned crystal orientation.

 

 

Parameter	Guaranteed Value	Test Condition
Core Loss (W/kg)	≤ 0.90 W/kg	1.70 T, 50 Hz
Magnetic Induction B800 (T)	≥ 1.88 T	800 A/m
Magnetic Induction B1000 (T)	≥ 1.91 T	1000 A/m
Stacking Factor	≥ 96.5%	Applied pressure 1.0 MPa
Aging Factor (225°C × 200h)	≤ 0.75	Minimum degradation over transformer lifetime

 

 

Thanks to its ultra‑low core loss and high magnetic induction, this CRGO steel sheet is the preferred material for:

• Power and distribution transformers (15 kVA – 100 MVA) – Achieve IE3 / IE4 efficiency levels with lower manufacturing cost than amorphous metal.
• Instrument transformers (current transformers, voltage transformers) – Low error factor and excellent linearity due to stable permeability.
• Reactor cores for harmonic filters, VFDs, and power factor correction – Stable inductance under high flux conditions.
• Welded and wound toroidal cores – Good ductility allows tight bending without micro‑cracking.
• EV charging station transformers – Compact high‑frequency modules benefit from low excess loss.
• Marine and offshore transformers – Reduced heat generation improves safety and reliability in confined spaces.

 

 

• Mill test certificate (MTC) according to EN 10204 Type 3.1
• Third‑party inspection available (SGS, BV, Intertek) upon request
• Full compliance with RoHS, REACH, and international conflict mineral regulations

 

 

Selecting the right core material directly determines your transformer's efficiency rating, operating temperature, and long‑term reliability.

 

GNEE's Low Loss CRGO Steel Sheet 0.23mm 0.9W/kg for Transformer Core delivers exactly what modern transformer manufacturing demands: guaranteed low core loss of 0.9 W/kg, high magnetic induction (B800 ≥ 1.88 T), consistent thickness tolerance, and excellent mechanical workability. By specifying this CRGO steel sheet for your transformer core, you are making a strategic investment in energy savings, regulatory compliance, and product competitiveness.

 

Ready to lower your transformer core loss and improve efficiency?

Fill in the quick inquiry form below (or email us directly) with your required sheet width, length, coating type, and quantity. Our technical sales team will respond within 8 hours with a competitive quotation, free slitting recommendation, and a complete mill test certificate. Let's build more efficient transformers – together.

 

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What are the grades of CRGO steel?

CRGO Grades
CRGO steel is available in several standard grades, each with varying levels of core loss and permeability. The most common grades are M3, M4, M5, and M6. The lower the number, the better the magnetic properties.

 

How does the thickness of CRGO affect performance?

Hysteresis and eddy current losses tend to be lower in lower-grade CRGO (M-3) compared to higher-grade CRGO (M-4, M-5, and M-6) due to the smaller lamination thickness in lower grades and larger lamination thickness in higher grades. Transformers are one of the most important components of power system distribution.

 

What is the difference between amorphous steel and CRGO steel?

The difference lies in the atomic structure of the core material. CRGO steel has a crystalline grain structure that causes higher energy losses during magnetization. Amorphous metals, on the other hand, have a random atomic arrangement, which minimizes domain wall movement and reduces magnetic hysteresis losses.

 

What are the raw materials for CRGO?

The production of CRGO steel sheets starts with the selection of high-quality raw materials. The primary raw materials are iron ore, coal, and limestone. These materials are extracted from mines and processed into their respective forms.