Grain Oriented Silicon Steel Coil Transformers | High Magnetic Induction · Low Core Loss

Product Overview‌

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CJM is a trusted supplier of Grain Oriented Silicon Steel Coils (GOES), offering a wide range of high-performance grades for power and distribution transformers. With over 15 years of industry experience, an annual inventory of 1 million+ tons, and a global presence across Europe, South America, the Middle East, India, and beyond, CJM provides reliable materials and services tailored to transformer manufacturers worldwide.

What is Grain Oriented Silicon Steel Coil?

Grain Oriented Silicon Steel Coil is a high-performance electrical steel designed specifically for transformer cores. Through advanced heat treatment and precise grain orientation control, the material delivers superior magnetic properties in the rolling direction, significantly reducing energy loss and enhancing transformer efficiency.

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Key Features

Item	Characteristic
Composing Component	Inorganic coating
Surface insulation resistance	Surface insulation resistance (Guaranteed Value: 30 Q.cm2/side) and excellent insulation
Adhesion	Fine adhesion, adhesion level ≥ B, close combination of coating and substrate, unease to peel
Lamination factor	Uniform coating and high Lamination factor make good lamination effect.
Processability	Excellent stamping and welding ability
Heat resistance	For the high magnetic induction type products, the coating can withstand 820°C stress relieving annealing in non-oxidation environment.
Corrosion resistance	The coating can immune from the corrosion of insulating coil,mechanical oil, cooling coil, antifreezing oil, rust preventive oil and Freon.
Limits of hazardous substances	The products comply with RoHS and REACH limited requirements for hazardous substances.

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Technical Specifications

Category	Specification
Standards	ASTM A876 / IEC 60404-8-7 / JIS C2552 / GB/T 2521
Grades	CGO: 30QG120, 30QG130 HiB: 23QG110, 27QG120
Coil Weight	1 – 10 tons (customizable)
Magnetic Induction (B800)	≥ 1.88 T
Core Loss (P1.7/50)	≤ 1.05 W/kg
Stacking Factor	≥ 0.96
Edge Type	Slit Edge or Mill Edge
Applications	Power transformers, distribution transformers, CTs, VTs, and more
Processing	Secondary recrystallization, laser scribing (optional)
Packaging	Export-safe with anti-rust paper, plastic wrap, steel strap, pallet

Nominal Thickness (mm)	Nominal Width (mm)	Inner Diameter (mm)	Weight (t)
0.15、0.18、0.20、0.23、0.27、0.30	900~1200	508	2~5
Note:  Please consult us if you have special weight requirements.

Nominal thickness (mm)		Thickness tolerance (mm)	Transverse thickness tolerance (mm)	Longitudinal thickness tolerance (mm)	Width tolerance (mm)	Flatness (%)	Camber 2m (mm)
0.15		+0.008 – 0.015	≤0.010	≤0.012	0~+0.5	≤1.0	≤0.8
0.18
0.2
0.23		+0.010 – 0.020
0.27			≤0.012
0.3		+0.010 – 0.025
Note:	(1) Traverse thickness deviation refers to the thickness difference between the sheet center and 15mm from the edge. (2) The longitudinal thickness difference is the difference of the measured maximum thickness and the minimum thickness in the longitudinal direction at an arbitrary 2m length of steel on a arbitrary coil. (3) Please consult us if you have special dimensional requirements.

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Applications of Grain Oriented Silicon Steel Coil

CJM’s grain oriented silicon steel coils are designed for advanced magnetic performance and energy efficiency. They are widely used across key segments of the power and energy industry. Below are the main application areas:

Power Transformers

Used in high-voltage transmission systems and substations, power transformers require high magnetic induction and minimal core loss. HiB grade silicon steel ensures long-term stability and reduced no-load loss in equipment operating at voltages up to 750kV.

Typical Users: Grid operators, transformer OEMs, utility companies

Distribution Transformers

Common in residential, commercial, and industrial power distribution, these transformers operate continuously and demand low energy loss. CJM’s GO steel enables better efficiency and temperature control, which leads to longer service life and lower operational cost.
Typical Users: Local utilities, building energy systems, rural electrification projects

Instrument Transformers (CTs and VTs)

Current and voltage transformers require precision magnetic properties for accurate power measurement and protective relays. GO steel’s stable permeability and low hysteresis make it ideal for these compact, high-accuracy devices.

Typical Users: Switchgear manufacturers, substation automation providers

Smart Grid and Renewable Energy Systems

As global energy shifts toward renewables, grain oriented silicon steel plays a critical role in solar inverter transformers, wind turbine step-up transformers, and smart grid control units. It supports compact design and low-loss operation essential for modern energy systems.

Typical Users: Solar and wind energy equipment manufacturers, EPC contractors

Industrial Power Systems

Factories and heavy-duty facilities rely on large transformers and reactors to regulate voltage and current. GO steel provides excellent magnetic stability and heat resistance under demanding industrial conditions.

Typical Users: Metallurgy plants, oil & gas facilities, cement and chemical industries

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Why Choose CJM?

• 15+ Years of Expertise‌: Trusted supplier with a global footprint.
• 1 Million+ Tons Annual Inventory‌: Ensures stable supply and quick delivery.
• End-to-End Solutions‌: Combines sales, precision cutting, processing, and logistics.
• Global Markets‌: Serving Europe, South America, the Middle East, India, and beyond.

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Global Markets & Reach

CJM proudly serves clients in:

• Europe – Germany, France, Italy, Poland
• South America – Brazil, Argentina, Chile
• Middle East – UAE, Saudi Arabia, Egypt
• India and other fast-growing regions

We support OEM/ODM, fast delivery, and flexible logistics for global customers.

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Logistics & Services

With a massive inventory and in-house processing, CJM delivers fast, precisely cut silicon steel coils worldwide.
Our integrated service system ensures:

• Real-time supply chain support
• On-demand slitting & cutting
• Secure packaging for sea/air freight

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Get Your Electrical Steel Plate Today!

Looking for a reliable electrical steel plate partner? Contact CJM’s expert sales team today.

Q: What is your company’s main products/services?

A: We are a professional manufacturer for Carbon Steel, Alloy Steel and Profile products. We have the experience of steel business for more than 10 years and our products are exported to Mid East,South America,Southeast Asia,Africa,South and East Asia etc.

Q: Can I go to your factory for a visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What are your terms of payment?

A: 30% T/T deposite and 70% balance before shipment.

Q: What is your delivery time?

A: For stocks,we could transport the goods to loading port within 7 days after we received the deposit; For production,it usually takes about 15-30 days after receiving the deposit.

Q: Do you provide samples? Are they free or paid?

A: Samples are available for free,but the courier freight will be covered by customer account.

Q: Do you accept the third party inspection?

A:Yes, we fully accept ‌third-party inspections.

Q: Why should I buy from you not from other suppliers?

A: Integrating the superior resources of China’s steel industry, we provide customers with high-quality steel products at preferential prices, and can ensure that the goods are delivered to customers in a timely manner.

Q:How can you guarantee quality?

A: Always a pre-production sample before mass production;Always 100% inspected before shipment