The efficiency and reliability of a power transformer depend heavily on the quality of its magnetic core material. In modern energy systems where power density and efficiency are critical, Hi-B (High Permeability) grade CRGO steel has become the preferred choice for transformer manufacturers.
At Sarjani Coretech, we supply and process Hi-B grade CRGO coils that combine low core loss, excellent magnetic alignment, and consistent slitting accuracy ensuring every transformer core delivers maximum performance with minimum energy wastage.
Understanding Hi-B Grade CRGO Steel
Cold Rolled Grain Oriented (CRGO) electrical steel is specifically processed to align its grains in the rolling direction, allowing magnetic flux to flow with minimal resistance. Hi-B grade CRGO takes this one step further through advanced secondary recrystallization and coating techniques that enhance magnetic properties.
Key characteristics of Hi-B grade CRGO steel:
- Lower core loss than conventional grades such as M3, M4, and M5
- Higher magnetic flux density (up to 1.9 Tesla)
- Improved permeability with reduced magnetizing current
- Stable performance over a wide range of operating conditions
This makes Hi-B grade coils ideal for power transformers, distribution transformers, and reactors where energy efficiency and compact design are essential.
The Science Behind Superior Efficiency
Hi-B grade CRGO coils minimize energy loss in two main forms hysteresis loss and eddy current loss.
Reduced Hysteresis Loss
The refined grain structure and special domain refinement coatings in Hi-B steel reduce the energy required to magnetize and demagnetize the core with each cycle. This directly lowers hysteresis losses during alternating magnetic flux.
Minimized Eddy Current Loss
The high electrical resistivity and thinner laminations of Hi-B CRGO reduce eddy current formation within the core. This keeps heat generation low and ensures stable performance under continuous operation.
Together, these properties enable transformers to achieve higher efficiency and reduced temperature rise, which prolongs service life and reduces operational costs.
Measurable Performance Advantages
Compared to conventional CRGO grades, Hi-B coils demonstrate significant performance benefits:
| Property |
Conventional CRGO (M4/M5) | Hi-B Grade CRGO |
|---|---|---|
| Core Loss (W/kg @ 1.7T) | 0.95–1.10 | 0.70–0.85 |
| Magnetic Flux Density (T) |
1.75–1.80 | 1.88–1.90 |
| Permeability |
Moderate | Very High |
| Magnetizing Current | Higher | Lower |
| Efficiency | Standard | Superior |
These improvements translate into tangible results for transformer OEMs smaller design footprints, lighter cores, and compliance with BEE and IEC efficiency norms.
Sarjani Coretech’s Expertise in Hi-B Grade CRGO Processing
Sarjani Coretech integrates advanced slitting, inspection, and handling methods to preserve the intrinsic magnetic properties of Hi-B CRGO steel.
Our capabilities include:
- Precision slitting with micron-level width accuracy and burr-free edges
- Temperature- and tension-controlled processing to prevent stress-induced magnetic degradation
- Batch-wise quality verification for core loss, flux density, and coating integrity
- Custom slit widths for mitred and rectangular core assemblies
By maintaining the purity and uniformity of each Hi-B slit coil, we ensure that transformer cores operate with consistent magnetic behavior and low loss across all load conditions.
Meeting the Demands of Modern Power Infrastructure
With renewable integration, smart grids, and increasing energy demand, transformers today must deliver higher performance under tighter efficiency regulations. Hi-B grade CRGO coils enable manufacturers to meet these expectations by providing:
- High energy efficiency with reduced no-load losses
- Compact core design without compromising magnetic performance
- Improved thermal stability for extended operational life
- Noise reduction through uniform flux distribution and low magnetostriction
These benefits make Hi-B grade CRGO a critical material for next-generation transformers in utilities, substations, and industrial power systems.
Excellence Through Material Integrity
At Sarjani Coretech, every Hi-B grade CRGO coil reflects a commitment to material excellence and process precision. From mother coil inspection to final slit output, every step is optimized to maintain the steel’s superior grain orientation and coating performance.
The result: high-efficiency transformer cores that drive energy savings, reliability, and long-term value.