Low Loss CRGO Steel Sheet, 0.23 mm, 0.9 W/kg
May 25, 2026
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What Is 0.23 mm CRGO Steel
Low loss 0.23 mm CRGO (cold rolled grain oriented) steel is a premium electrical steel used to manufacture highly efficient transformer cores. With a maximum core loss of 0.9 W/kg at 1.7 T and 50 Hz, this ultra-thin gauge restricts eddy currents and minimizes heat generation, substantially increasing energy efficiency. The grade is typically classified as M3 in the traditional CRGO classification, where lower numbers indicate lower loss.
Key Technical Specifications
Thickness: 0.23 mm nominal. Maximum core loss: 0.9 W/kg at 1.7 T, 50 Hz. Material composition: silicon iron alloy with high-purity silicon of about 3.0-3.3 percent. Magnetic induction at 800 A/m: about 1.88 T. Industry standards: IEC 60404-8-7, ASTM A876, and JIS C 2553.
Advantages for Transformer Cores
Minimal eddy current losses: the 0.23 mm thickness is one of the thinnest commercially available for power and distribution transformers, reducing circulating (eddy) currents and keeping no-load losses exceptionally low.
Directional magnetic properties: the crystalline structure is aligned in the rolling direction, providing 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.
Chemical Composition (Mass Percent)
Silicon 3.0-3.3 (increases resistivity, reduces eddy current loss, and promotes Goss texture during final annealing); carbon 0.06 max (prevents magnetic aging); manganese 0.08-0.20 (forms MnS precipitates as grain growth inhibitors); phosphorus 0.015 max; sulfur 0.003-0.035 (part of the inhibitor system); aluminum 0.01-0.05 (forms AlN particles that control grain orientation); nitrogen 0.003-0.012 (works with aluminum for inhibitor distribution); iron balance.
Magnetic Properties (Epstein Test, 50 Hz)
| Parameter | Guaranteed value | Test condition |
|---|---|---|
| Core loss | 0.90 W/kg max | 1.70 T, 50 Hz |
| Magnetic induction B800 | 1.88 T min | 800 A/m |
| Magnetic induction B1000 | 1.91 T min | 1000 A/m |
| Stacking factor | 96.5% min | Applied pressure 1.0 MPa |
| Aging factor (225 deg C x 200 h) | 0.75 max | Minimum degradation over lifetime |
Applications
Power and distribution transformers (15 kVA to 100 MVA), achieving IE3/IE4 efficiency levels with lower manufacturing cost than amorphous metal; instrument transformers with low error factor and excellent linearity; reactor cores for harmonic filters, VFDs, and power factor correction; welded and wound toroidal cores with good ductility for tight bending; EV charging station transformers; and marine and offshore transformers where reduced heat generation improves safety.
Compliance
Mill test certificates can be provided according to EN 10204 Type 3.1, with third-party inspection available upon request, and the material complies with applicable substance and conflict-mineral regulations.
Frequently Asked Questions
Q: What are the grades of CRGO steel? A> The most common grades are M3, M4, M5, and M6; the lower the number, the lower the core loss and the better the magnetic properties.
Q: How does thickness affect performance? A> Thinner laminations such as 0.23 mm reduce eddy current loss, giving lower no-load losses than thicker grades.
Q: What is the difference between amorphous and CRGO steel? A> CRGO has a crystalline grain structure; amorphous metal has a random atomic arrangement that minimizes hysteresis loss but costs more.
Q: What are the raw materials for CRGO? A> High-purity iron units, silicon, and controlled alloy additions, processed through steelmaking and rolling routes.
Q: What is the guaranteed core loss? A> 0.90 W/kg maximum at 1.7 T and 50 Hz.
Q: What standards apply? A> IEC 60404-8-7, ASTM A876, and JIS C 2553.
Need 0.23 mm low loss CRGO steel for your transformer production? Contact us with grade, width, and quantity for a quotation.