What Is CRGO Silicon Steel?
Cold-rolled grain-oriented (CRGO) silicon steel is a premium iron–silicon alloy specially developed for transformer cores and other high-efficiency electromagnetic equipment. Compared with ordinary electrical steel, CRGO offers higher magnetic permeability, lower core loss, and more stable magnetic performance, making it the preferred material for power and distribution transformers worldwide.
CRGO steel is widely used in:
- Power transformers
- Distribution transformers
- Large generators
- High-performance electrical equipment
CRGO Manufacturing Process
1. Cold Rolling
Available Thickness:
- 0.23 mm
- 0.27 mm
Cold rolling ensures precise thickness control and excellent surface quality, which are essential for stable magnetic performance.
2. Annealing
After cold rolling, the steel is annealed at high temperatures to form a highly aligned grain structure. This process significantly improves:
- Magnetic permeability
- Core loss performance
- Directional magnetic consistency
3. Insulation Coating
A thin insulation coating is applied to the surface to:
- Reduce eddy current loss
- Improve inter-laminar insulation
- Enhance long-term transformer efficiency and durability
Standard Dimensions of CRGO Products
Available Thickness:
- 0.23 mm
- 0.27 mm
Available Width Range:
- 700 – 1200 mm
Inside Diameter (ID):
- 508 mm
These standard dimensions ensure compatibility with most transformer core cutting and lamination production lines.
Dimensional and Shape Tolerances
| Thickness (mm) | Thickness Tolerance | Longitudinal Tolerance | Traverse Tolerance | Width Tolerance | Flatness (%) | Camber within 2m |
|---|---|---|---|---|---|---|
| 0.23 | ±0.025 mm | ≤ 0.030 mm | ≤ 0.02 mm | 0 ~ +2 mm | ≤ 1.5 | ≤ 1.0 mm |
| 0.27 | ±0.03 mm | ≤ 0.030 mm | ≤ 0.02 mm | 0 ~ +2 mm | ≤ 1.5 | ≤ 1.0 mm |
These tolerances ensure excellent cutting accuracy, low burr formation, and stable stacking during transformer core assembly.
Key Properties of CRGO Steel
- High Magnetic Permeability:
Enables efficient magnetic flux conduction with minimal energy loss. - Low Core Loss (P1.7/50):
Reduces no-load losses in transformers and improves overall energy efficiency. - Superior Surface Quality:
Ensures better insulation performance and long service life. - Stable Density:
Standard density: 7.65 kg/dm³, ensuring consistent electromagnetic performance.
CRGO Steel Grades and Electromagnetic Performance
CRGO grades are classified mainly by thickness and core loss (P1.7/50). Based on your provided production data, the common commercial grades are as follows:
0.23 mm Thickness Grades
| Grade | Thickness (mm) | Density (kg/dm³) | P1.7/50 (W/kg) | B8 (Tesla) | Typical Application |
|---|---|---|---|---|---|
| 23Q85 | 0.23 | 7.65 | 0.800 – 0.850 | 1.85 – 1.89 | Ultra-high efficiency power transformers |
| 23Q90 | 0.23 | 7.65 | 0.850 – 0.900 | 1.85 – 1.89 | High-efficiency transmission transformers |
| 23Q95 | 0.23 | 7.65 | 0.890 – 0.910 | 1.85 – 1.89 | Premium distribution transformers |
| 23Q100 | 0.23 | 7.65 | 0.900 – 0.970 | 1.85 – 1.89 | Standard high-efficiency transformer cores |
| 23Q105 | 0.23 | 7.65 | 0.971 – 1.020 | 1.85 – 1.89 | Medium-loss transformer designs |
| 23Q110 | 0.23 | 7.65 | 1.021 – 1.050 | 1.85 – 1.89 | Cost-effective distribution transformers |
0.27 mm Thickness Grades
| Grade | Thickness (mm) | Density (kg/dm³) | P1.7/50 (W/kg) | B8 (Tesla) | Typical Application |
|---|---|---|---|---|---|
| 27Q100 | 0.27 | 7.65 | 0.900 – 0.970 | 1.85 – 1.89 | High-performance medium-sized transformers |
| 27Q105 | 0.27 | 7.65 | 0.971 – 1.020 | 1.85 – 1.89 | General power and distribution transformers |
| 27Q110 | 0.27 | 7.65 | 1.021 – 1.050 | 1.85 – 1.89 | Cost-performance balanced transformer cores |
| 27Q120 | 0.27 | 7.65 | 1.051 – 1.150 | 1.85 – 1.89 | Economical distribution transformer applications |
Why CRGO Grades Matter
1. Energy Efficiency
Lower P1.7/50 values directly reduce transformer no-load losses, helping manufacturers meet increasingly strict energy-efficiency standards worldwide.
2. Lifetime Cost Savings
Although higher-grade CRGO has a higher initial material cost, it significantly lowers:
- Electricity losses
- Operating costs
- Carbon emissions
over the full life cycle of the transformer.
3. Performance Stability
Stable grain orientation and consistent B8 values ensure reliable long-term operation under continuous magnetic loading.
DLS CRGO – Reliable CRGO Silicon Steel for Global Transformer Manufacturers
DLS CRGO specializes in supplying stable, high-performance CRGO silicon steel for transformer core manufacturing. Based on the above technical specifications, DLS CRGO offers:
- Full coverage of 23Q and 27Q series grades
- Stable P1.7/50 performance control
- Standard width 700–1200 mm
- Thickness 0.23 mm & 0.27 mm
- Strict dimensional and shape tolerances
- Support for slitting, cutting, and customized core processing
Whether you are producing high-efficiency power transformers or cost-optimized distribution transformers, DLS CRGO can provide reliable material solutions with consistent quality and global supply capability.
👉 For CRGO grade selection, technical consultation, or customized supply solutions, contact DLS CRGO today. We help you build more efficient, reliable, and competitive transformer products.
