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Sep 28, 2025
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silicon steel transformer core Product Description
The silicon steel transformer core is the core magnetic conductive component of a transformer. Made from silicon steel sheets (special electrical steel containing 1.0%–3.5% silicon) through cutting and lamination, its core function is to construct a closed magnetic circuit, enabling efficient conduction of alternating magnetic fields and energy conversion.
Its performance directly determines the transformer's energy efficiency, volume, and operational stability, making it the "heart" component of all power-frequency transformers in the power and electronics fields.
Core Classification: Based on Silicon Steel Sheet Type
According to the magnetic properties of silicon steel sheets, silicon steel transformer cores are mainly divided into two categories, each suitable for different power and energy efficiency requirements:
1. Non-Oriented Silicon Steel Core (CRNO Core)
Material Characteristics: Uses cold-rolled non-oriented (CRNO) silicon steel sheets. The crystal grains have no obvious directional arrangement, resulting in "isotropic" magnetic properties (difference in magnetic permeability and core loss in any direction ≤10%). The silicon content is usually 1.5%–2.5%, and the thickness ranges from 0.35mm to 0.5mm.
Core Advantages: Flexible manufacturing (can be cut and stamped in any direction), low cost, and good toughness (not easily brittle), making it suitable for scenarios with variable magnetic field directions.
Typical Applications: Small and medium-power transformers, such as power transformers for household appliances (air conditioners, refrigerators), auxiliary transformers for industrial control (capacity ≤10kVA), and small distribution transformers (below 10kV/50kVA).
2. Oriented Silicon Steel Core (CRGO Core)
Material Characteristics: Uses cold-rolled grain-oriented (CRGO) silicon steel sheets. Through cold rolling and high-temperature annealing, the crystal grains are highly aligned along the rolling direction, leading to "anisotropic" magnetic properties (magnetic permeability in the rolling direction is more than 50 times higher than that in the transverse direction). The silicon content is 2.5%–3.5%, the thickness is 0.18mm–0.35mm, and the surface is coated with an insulating layer (to prevent inter-lamination short circuits).
Core Advantages: High magnetic permeability (B8 ≥1.78T) and low core loss (P1.5/50 ≤1.1W/kg), with much better energy efficiency than non-oriented cores. It can reduce the transformer's volume and loss.
Typical Applications: Medium and high-power transformers, such as grid distribution transformers (above 10kV/100kVA), power transformers (110kV and above), and high-efficiency energy-saving transformers (Class 1/Class 2 energy efficiency).
electrical steel Feature
- Silicon steel lets magnetic fields move through it easily. This makes transformers smaller and work better.
- Silicon in the steel helps stop energy loss. It lowers hysteresis and eddy current losses. This keeps transformers cooler and saves power.
- Thin sheets of silicon steel are put together in layers. This stops large electric currents inside the core. It helps reduce heat and makes transformers work better.
- Silicon steel does not cost too much and works well. It gives good efficiency and lasts a long time without high costs.
- Transformers with silicon steel cores work well with different loads. They last longer and help save both energy and money.
Transformer Iron Core specifications
| Type | Grade | Width | Max Core Loss@P1.7T/50Hz | Lamination Factor(%) | Min Induction@B800 |
| Common Type | 23Q110 | 900-1200mm | 1.10w/kg | 97.2 | 1.82T |
| 23Q120 | 1.20w/kg | 97.2 | 1.82T | ||
| 27Q120 | 1.20w/kg | 97.5 | 1.82T | ||
| 30G120 | 1.20w/kg | 98 | 1.82T | ||
| High Induction Type |
B20P085 | 900-1200mm | 0.85w/kg | 97 | 1.86T |
| B23P085 | 0.85w/kg | 97.2 | 1.88T | ||
| B23P090 | 0.90w/kg | 97.2 | 1.88T | ||
| B23P095 | 0.95w/kg | 97.2 | 1.88T | ||
| B23P100 | 1.00w/kg | 97.2 | 1.88T | ||
| B27P095 | 0.95w/kg | 97.5 | 1.89T | ||
| B27P100 | 1.00w/kg | 97.5 | 1.89T | ||
| B30P120 | 1.20w/kg | 98 | 1.89T | ||
| Domain Refined High Induction Type(Laser) |
B20R065 | 900-1200mm | 0.65w/kg | 97 | 1.86T |
| B23RK085 | 0.85w/kg | 97.2 | 1.88T | ||
| B27RK085 | 0.85w/kg | 97.5 | 1.89T |
GNEE Featured Products
Gnee provides premium iron cores to the world. Our cores can be selected in a wide range of materials, shapes, applications, manufacturing techniques, etc., to meet customers' diverse demands. Explore our wide product range now~
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.
30+
Types of Products
18k+
Happy Clients
Why Choose GNEE EC?
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.
18+
Over 18 years of success in the iron core industry;
National High-tech Enterprise & Famous Brand Enterprises in China;
200+
Over 200 employees;
The R&D team has more than 80 experienced engineers and the production team has more than 100 skilled staffs;
35+
Annual turnover up to 35 million dollor per year;
Owns many sets of highly automatic winding, annealing, and assembling machines;
1,000+
Over 1000 customers in domestic and overseas markets;
core Products are exported to more than 70 countries in the world;
Gnee Iron Core Factory Overview
Meet Our Sales Manager
"The Core of the Iron Core, the Power of Leadership" - See Our Great Decision-Makers Deeply Engaged in the Magnetic Materials Industry.
Edison Zhang
CEO
Kelly Zhang
General Manager
Alex Cao
Sales Manager
Industries Served
Automobile Industry
New Energy
Transformer Applications
Our Mission
Strive To Create world-class Iron core brand
With 18 Years of industry experience, we focus on the research, development, and manufacturing of high-quality iron cores for electricity, industrial control, new energy, and automotive markets