0.27mm M4 cold rolled crgo laminated grain oriented silicon steel sheet for transformer iron core
Sep 28, 2025
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Cold rolled grain-oriented silicon electrical steel Product Description

Cold rolled grain-oriented silicon electrical steel (CRGO) is a high-performance magnetic material used primarily in high-efficiency transformers, reactors, and other electrical equipment to enhance performance and reduce energy loss. Through a cold rolling process, its silicon content and crystal structure are aligned in the direction of the rolling, resulting in excellent magnetic permeability and low core losses in that direction.
CRGO electrical steel is generally used in transformer enterprises at home and abroad, applied to UHV transformers, high-efficiency transformers, etc.
silicon steel sheet Key Characteristics:
- Silicon Content: Contains 2.9% to 3.5% silicon, which improves its magnetic properties.
- Grain Orientation: Features a highly directional and regular crystal structure, aligning with the rolling direction. This is known as "Goss texture".
- High Magnetic Permeability: Easily magnetized in the rolling direction, making it ideal for transformer cores.
- Low Core Losses: Significantly reduces energy loss in electrical devices, improving efficiency.
- High Electrical Resistivity: Contributes to lower energy dissipation.
Electrical Silicon Steel Manufacturing & Treatment:
- Cold Rolling:
The process involves cold rolling, which refines the grain structure, ensures a uniform thickness, and enhances the final magnetic properties in the desired direction.
- Secondary Recrystallization:
This treatment promotes the growth of specific crystal orientations, further boosting the material's magnetic capabilities.
- Insulating Coatings:
Insulating coatings are applied to the surface to minimize eddy currents and improve overall insulation, which helps reduce core loss.
Electrical Silicon Steel Applications:
- Transformer Cores:
The primary application for CRGO steel, where its superior magnetic properties enable the construction of more efficient transformers.
- Reactors and Large Motors:
Used in other high-demand electrical components to improve efficiency and reliability.
Silicon Electrical Steel Benefits:
- Increased Efficiency:
By minimizing core losses, CRGO steel makes electrical devices more energy-efficient.
- Reduced Greenhouse Gas Emissions:
Higher energy efficiency in electrical grids helps lower greenhouse gas emissions and supports a sustainable energy transition.
- Enables Renewable Energy:
CRGO steel's contribution to transformer efficiency is crucial for integrating and distributing renewable energy sources reliably.
Silicon Electrical Steel specifications
Electromagnetic Property Standard
|
Type |
Thickness(mm) |
Grade |
Density (kg/dm³) |
Max.core loss (W.kg) |
Min. Magnetic induction (T) |
|
High magnetic induction type |
0.27 |
27SQG090 |
0.90 |
1.89 |
0.960 |
|
27SQG095 |
0.93 |
1.89 |
0.960 |
||
|
27SQG100 |
0.96 |
1.89 |
0.960 |
||
|
27SQG110 |
1.05 |
1.88 |
0.960 |
||
|
Domain refined type |
27SQGD080 |
0.80 |
1.89 |
0.960 |
|
|
27SQGD085 |
0.84 |
1.89 |
0.960 |
||
|
27SQGD090 |
0.87 |
1.89 |
0.960 |
||
|
27SQGD098 |
0.92 |
1.88 |
0.960 |
Typical Electromagnetic Property
|
Type |
Thickness (mm) |
Steel grade
|
Max.core loss(W.kg) |
Min. Magnetic induction(T) |
Min. Laminated factor |
|||
|
50Hz or 60Hz |
||||||||
|
P1.5/50a |
P1.5/60a |
P1.7/50 |
P1.7/60b |
J 800 |
||||
|
High Magnetic Induction Type |
0.27 |
27SGQ090 |
0.67 |
0.88 |
0.89 |
1.18 |
1.91 |
0.960 |
|
27SGQ095 |
0.69 |
0.91 |
0.92 |
1.22 |
1.91 |
0.960 |
||
|
27SGQ100 |
0.68 |
0.91 |
0.95 |
1.23 |
1.91 |
0.960 |
||
|
27SGQ110 |
0.70 |
0.93 |
1.00 |
1.27 |
1.90 |
0.960 |
||
|
Domain Refined Type |
27SGQD080 |
0.61 |
0.80 |
0.80 |
1.06 |
1.91 |
0.960 |
|
|
27SGQD085 |
0.62 |
0.82 |
0.83 |
1.10 |
1.91 |
0.960 |
||
|
27SGQD090 |
0.62 |
0.84 |
0.85 |
1.12 |
1.91 |
0.960 |
||
|
27SGQD095 |
0.64 |
0.87 |
0.90 |
1.16 |
1.90 |
0.960 |
||
|
Low noise Type |
27SQGD085LN |
0.62 |
0.82 |
0.83 |
1.10 |
1.91 |
0.960 |
|
|
27SQGD090LN |
0.62 |
0.84 |
0.85 |
1.12 |
1.91 |
0.960 |
||
|
No Glass Film Type |
27SQG120NG |
0.93 |
1.21 |
1.20 |
1.57 |
1.90 |
0.960 |
|
Typical Mechanical Properties
|
Norminal thickness (mm) |
Hardness Hv1 |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
Number of bends (Times) |
|
0.27 |
195 |
348 |
327 |
11 |
15 |
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Manufacturing Process

1. Raw Material Sourcing

2. Slitting

3. Punching

4. Laminating

5. Core Forming

6. testing
GNEE EC
Founded in 2008 and located in Anyang in China, Gnee Electric is a high-tech enterprise specializing in researching and manufacturing iron core products.
The company currently occupies over 20,000 square meters and employs more than 200 people, including over 80 professionals. After more than 18 years of development, we have built our own magnetic material production base and independently develope, produce, and sell various kinds of iron cores. The common types include silicon steel cores, motor cores, transformer cores, toroidal iron cores, special-shaped cores, custom cores, and others. Our cores are widely applied in different sectors including transformers, motors, mutual inductors, voltage stabilizers, welding machines, magnetic amplifiers, and instrumentation, providing diverse core solutions to global customers.

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GNEE EC was founded in 2008, which is a National High-tech Enterprise & Famous Brand Enterprise in China, developing into a professional manufacturer and supplier of high-quality iron cores.
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Over 18 years of success in the iron core industry;
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200+
Over 200 employees;
The R&D team has more than 80 experienced engineers and the production team has more than 100 skilled staffs;
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Annual turnover up to 35 million dollor per year;
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Over 1000 customers in domestic and overseas markets;
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