0.27mm 0.9W/kg 2.9-3.3% Si Cold Rolled Grain Oriented Steel
May 25, 2026
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At GNEE, we are a leading supplier of electrical steels with over 18 years of export experience. We understand that overseas transformer manufacturers need reliable, high-performance core materials that reduce energy loss and meet strict international standards.
Our 0.27mm grain oriented silicon steel (0.9W/kg, 2.9–3.3% Si) helps you build more efficient transformers, cut operational costs, and pass IEC/ANSI certifications. We offer custom slitting, packaging for sea freight, and just-in-time delivery to any port worldwide.
In-depth Analysis of Core Parameters
0.27mm Thickness: Ultra-thin design. Controlling the steel sheet thickness at 0.27mm exponentially cuts down eddy current loss under alternating magnetic fields of transformers.
0.9 W/kg Maximum Core Loss: The core magnetic performance indicator of the material. It means power consumption per kilogram of core material shall not exceed 0.9W under standard working frequency (50Hz/60Hz) and magnetic flux density (1.7 Tesla). It falls into the grade of low-loss Hi-B grain-oriented silicon steel in industrial applications.
2.9–3.3% Silicon Content: Precisely proportioned chemical composition for optimal electromagnetic performance. Silicon substantially boosts matrix resistivity and suppresses eddy current loss. Excess silicon above 3.5% will make steel extremely brittle, making cold rolling and stamping processing impossible.
Production Process：Definition of Grain Oriented
Grains and magnetic domains are randomly arranged in ordinary steel. Through elaborate cold rolling, intermediate annealing and final high-temperature texture annealing, CRGO steel aligns all easy magnetization axes along the rolling direction.Formed with exclusive Goss Texture, magnetic flux travels smoothly inside the steel, delivering superior magnetic permeability and ultra-low energy loss along the rolling direction.
Typical Application Scenarios of 0.27mm grain oriented silicon steel
Featuring anisotropy with directional high magnetic permeability and low heat generation, the material is processed into cut sheets, stacked laminations and wound cores for the below fields:
- Distribution Transformers: Core components widely used in urban and factory power grids
- Power Transformers: Main transformers of 110kV, 220kV and higher voltage levels in substations
- High-frequency Reactors & Medium-frequency Transformers: Key magnetic parts for PV and wind power inverter systems
- Precision Instrument Current Transformers: High-precision measuring devices requiring minimal magnetic signal attenuation
Equivalent Grade Comparison Chart
Naming rules vary among regional standards and manufacturers while sharing identical technical specifications. The first two digits refer to thickness, and the last three digits stand for core loss value.
| Standard & Manufacturer | Typical Grade | Naming Explanation |
|---|---|---|
| GB/T China National Standard | 27Q090 / 27G090 | 27 = 0.27mm; 090 = Max core loss ≤ 0.90 W/kg |
| Baosteel | B27R090 / B27P090 | B: Baosteel; R/P: Different grain-oriented steel series |
| Shougang | 27S090 | S: Shougang standard |
| JIS Japanese Industrial Standard | 27G090 | G: Conventional or high magnetic induction grade |
Conclusion – Get a Quote for 0.27mm Grain Oriented Silicon Steel Today
0.27mm grain oriented silicon steel with 0.9W/kg core loss and 2.9–3.3% silicon content is the proven solution for high-efficiency, low-loss transformer cores. Whether you need a sample coil for validation or a bulk order for mass production, GNEE delivers consistent quality, mill-direct pricing, and on-time shipping to over 50 countries.
Send us your specification (thickness, width, coating, quantity) and port of discharge. Our technical team will reply within 6 hours with:
- A detailed quotation (FOB/CIF)
- Mill test certificates (PDF)
- Custom slitting options – no extra charge for narrow widths
Contact GNEE now – click the inquiry button or email us directly. Let's build better transformers together.
What is grain-oriented silicon steel?
Grain-oriented electrical steel is a crucial material in the production of energy-efficient transformers and large, high-performance generators. In the form of laminated, wound, or punched sheets, it is the essential core material of distribution transformers, power transformers, and small transformers.
What is the thickness of silicon steel?
Silicon Steel - 0.35mm To 0.65mm Thickness, 1000mm Or 1200mm Width | High Dimension Accuracy, Low Core Loss, Excellent Sound Insulation Properties.
What is the difference between mild steel and silicon steel?
While traditional steel typically contains less than 2% carbon, silicon electrical steel contains between 1% to 4.5% silicon. This small change in composition can have a significant impact on the properties and performance of the material. Another key difference between the two materials is their conductivity.2023
What is the difference between grain oriented and non grain oriented steel?
Non-grain-oriented electrical steel (NGOES) is mainly used in rotating equipment, for example, electric motors, generators and over frequency and high-frequency converters. Grain-oriented electrical steel (GOES), on the other hand, is used in static equipment such as transformers.