CRGO slit coil
CRGO slit coil, also known as Cold Rolled Grain Oriented Steel slit coil, are precision-engineered electrical steels primarily used in transformer, inductor, and power equipment manufacturing. These coils are derived by slitting CRGO mother coils into narrow strips with high accuracy. The specialized cold rolling process aligns the crystal grains in a single direction, enhancing magnetic performance and ensuring reduced energy loss during operation.
At JAAS Steel Pvt. Ltd., we specialize in precision-cut CRGO slit coil using advanced CNC slitting lines equipped with carbide cutters to achieve maximum accuracy and a burr tolerance of just 10 microns. Our coils are rigorously tested in Lab as per IS and IEC standards to guarantee superior performance and reliability.
“At JAAS Steel Pvt. Ltd., we believe that precision-engineered CRGO steel is the backbone of transformer efficiency — ensuring minimal energy loss, consistent performance, and long operational life.”
Technical Team, JAAS Steel Pvt. Ltd.
Key Features
Why CRGO / CRNO Coils are vital for transformer applications:
- High magnetic permeability with low core losses
- Precision cutting with CNC slitting and 10-micron burr tolerance
- Smooth surface finish, free from rust, dents, or watermarks
- Wide range of material grades (23HP75d to 30CG130)
- Available in thickness range of 0.18mm to 0.35mm and width 25mm to 1000mm
- Supplied in coil weights from 50kg to 5000kg as per customer needs
- Advanced testing and quality assurance
- Superior multilayer packaging with VCI Paper, HDP, and Stretch Film
- Fully compliant with IS 3024:2015, IS 649, and IEC 60404 standards
CRGO coils are the preferred choice for energy-efficient transformers, while CRNO finds usage in motors, generators, and appliances where efficiency requirements are moderate.
Working Process
Our streamlined process ensures reliability and top performance:
Raw Material Inward
Material: CRGO coils are received from approved suppliers.
Checks: Visual inspection, test certificate verification (core loss, thickness, grade).
Storage: Coils stored in clean, dry area to prevent rust or damage.
RM Selection as per requirement.
Slitting Process
Purpose: To slit wide CRGO coils into narrow strips as per lamination width requirement.
Process: Coil loaded on decoiler → passed through slitting cutter for precise width cutting → rewound into slit coil.
Quality Checks: Width accuracy, burr level, edge quality.
Cutting Process
Purpose: To cut slit strips into required lamination lengths and shapes.
Process: Slit coil fed to cut-to-length or step-lap cutting machine. Pieces cut as per design with proper step-lap or butt-lap.
Checks: Length tolerance, burr, step accuracy, orientation marking.
Note: For certain designs, holes, slots, or notches are punched to aid assembly and clamping.
Core Assembly
Purpose: To assemble laminations into complete transformer cores.
Process: Laminations are stacked layer by layer as per core design (step-lap configuration). Tightening bolts or frames applied to ensure proper compression.
Checks: Dimension accuracy, stacking factor, loss test (NLL), insulation intactness.
Testing & Inspection
Core Loss & Magnetic Flux Density measured using Epstein
Dimensional, burr, and insulation checks done.
Results recorded and verified against specifications.
Packing & Dispatch
Laminations packed in moisture-proof wrapping on wooden pallet.
Proper labeling with grade, lot no., dimensions, and weight.
Dispatched to transformer manufacturers or customers.
Purpose
To produce precision CRGO laminations with minimal core loss, accurate dimensions, and consistent quality for use in power and distribution transformer cores.
Applications
CRGO slit coil are the backbone of high-efficiency transformers, ensuring minimal energy loss and superior magnetic performance for reliable power delivery.
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