High-permeability, low-loss CRGO silicon steel for transformer cores and large generators

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CRGO Core Strengths

Serving customers across the globe, we merge advanced technology with the strengths of Chinese manufacturing to provide dependable, cost-efficient solutions that energize industries worldwide.
Sheraxin is dedicated to producing high-performance, low-loss, high-permeability CRGO electrical steel and offering tailored processing solutions for transformer and power-generation industries worldwide. Supported by world-class facilities in China, we specialize in transformer-grade grain-oriented silicon steel, including domain-refined CRGO, low-magnetostriction grades, and chromium-free coated materials. Our strengths include a highly efficient supply chain, rigorous quality control, and deep expertise in advanced CRGO processing such as slitting, lamination preparation, and precision coil handling. By combining engineering capability with flexible customization, Sheraxin provides reliable, energy-efficient materials for power transformers, distribution transformers, large generators, instrument transformers, and renewable-energy equipment, ensuring stable performance and consistent core-loss reliability for customers worldwide, our strengths include:

CRGO Types:
A broad selection of products, including conventional, high-permeability, domain-refined, low-magnetostriction, and chromium-free coated grain-oriented electrical steel.

CRGO Grades:
A complete range of grades with core loss from 0.65 to 1.55 W/kg at P1.7/50Hz, available in thicknesses of 0.18, 0.20, 0.23, 0.27, 0.30, and 0.35 mm.

Expertise:
Over 16 years of dedication to CRGO grain-oriented electrical steel, supported by full R&D, production, and application capabilities.

CRGO Silicon Steel Parameter Table & Core-Loss Specifications

Item No.	Description of goods	Grade	Thickness (MM)	Guaranteed value	Typical value	Magnetic polarization (T) B8
Item No.	Description of goods	Grade	Thickness (MM)	Max Iron loss at P1.7/50 W/KG	Iron loss at P1.7/50 W/KG	Magnetic polarization (T) B8
1	(CRGO) Primary Cold Rolled Grain Oriented Silicon Steel Mother Coil	35GK155	0.35	1.55	1.33	1.88
2		30GK130	0.30	1.30	1.22	1.88
3		30GK120	0.30	1.20	1.12	1.88
4		30GK110	0.30	1.10	1.04	1.88
5		27GK120	0.27	1.20	1.12	1.88
6		27GK110	0.27	1.10	1.04	1.89
7		27GK100	0.27	1.00	0.95	1.90
8		27GK095	0.27	0.95	0.92	1.90
9		27GK090	0.27	0.90	0.85	1.90
10		23GK100	0.23	1.00	0.93	1.90
11		23GK090	0.23	0.90	0.85	1.91
12		20GK085	0.20	0.85	0.82	1.91
13		23GK085	0.23	0.85	0.83	1.91
14		20GK080	0.20	0.80	0.75	1.91
15		23GK080	0.23	0.80	0.77	1.91
16		23GK075	0.23	0.75	0.71	1.91
17		20GK075	0.20	0.75	0.70	1.91
18		20GK070	0.20	0.70	0.65	1.91
Density: 7.65 Note: • Magnetism measurement made according to GB/T 13789 (IEC 60404-3); • P1.7/50 refers to the result under the 50 Hz and the magnetic flux density of 1.7 T; • B8 refers to the result under the magnetic field strength of 800 A/m • Building Factor ＞96%.

CRGO Chemical Composition & Silicon Content Specifications

Silicon(Si)	Carbon(C)	Manganese(Mn)	Sulphur(S)	Phosphorus(P)	Aluminium(Al)	Chromium(Cr)	Nickel(Ni)	Cuprum(Cu)
3%~ 3.6%	Max. 0.01%	Max. 0.5%	Max. 0.02%	Max. 0.03%	Max. 0.005%	Max. 0.2%	Max. 0.01%	Max. 0.4%

CRGO Coil Weight Parameters

Our transformer-grade CRGO silicon steel coils are available in standard weights of 2.0–4.5 tons, suitable for high-precision slitting and lamination processes. For manufacturers requiring special coil sizes, we provide custom coil weight options, enabling smoother logistics, reduced material waste, and optimized production efficiency.

CRGO Coil Dimensions & Standardized Geometry

Coil Inner Diameter: 508 ± 12 mm
This industry-standard inner diameter ensures reliable performance during slitting and lamination processing for transformer-grade grain-oriented silicon steel, offering smooth coil feeding and stable workflow.

CRGO Silicon Steel Size and Shape Tolerances

(Unit: mm)

Value	Thickness Tolerance	Longitudinal Thickness Tolerance	Transverse Thickness Tolerance	Width	Width Tolerance
Guaranteed	±0.025	≤ 0.030	≤ 0.020	900~ 1200	0~+1 .5
Typical	±0.010	0.020	0.010	900~ 1200	0~+1 .5

CRGO Silicon Steel Mechanical Properties & Tensile Strength

Thickness (mm)	Tensile strength (MPa)		Yield strength (MPa)		Elongation (%)		Number of bends		Vickers Hardness	Stacking factor	Resistivity (x10-⁸) Ω ·m
Thickness (mm)	L	C	L	C	L	C	L	C	HV1	Stacking factor	Resistivity (x10-⁸) Ω ·m
0.18	345	402	324	342	13	42	44	14	201	0.953	52
0.20	349	405	326	346	13	42	41	12	202	0.958	52
0.23	354	401	331	346	14	42	32	11	205	0.963	53
0.27	378	438	360	380	10	39	30	9	220	0.968	54
0.30	372	408	346	367	14	44	23	7	208	0.973	53
0.35	369	405	347	365	13	42	20	6	209	0.980	53
Notes: Above is average value that can be achieved currently. L represents the test piece shall be taken longitudinal to the rolling direction. C represents the test piece shall be taken transverse to the rolling direction. The above values are typical values , only for reference and not guaranteed.

CRGO Surface Coating Properties

Thickness Per Side: 3–5 μm
The high-quality coating on CRGO silicon steel ensures consistent insulation performance, minimized core loss, and excellent compatibility with slitting and lamination processes.

CRGO Interlamination Resistance Performance

Guaranteed Value: ≥ 30 Ω·cm²
Typical Value: 90 Ω·cm²
High interlamination resistance enhances insulation quality in grain-oriented silicon steel, minimizing eddy currents and supporting low-loss transformer-core design.

Production and Delivery Capabilities for High-Performance CRGO Silicon Steel

4,000 to 7,000 tons

Monthly Production Capacity

tons

Inventory Available

15-25 days

Production Time

^{Customer Testimonials}

<span style="color:#333333;"><span style="font-size:16px;">Since cooperating with Sheraxin, our procurement has become much easier. In terms of quality, pricing, and service, they perform exceptionally well. Sheraxin is truly a reliable partner for our steel needs.</span></span>

<span style="color:#333333;"><span style="font-size:16px;"><span style="font-family:Open Sans;">We have cooperated with Sheraxin for years. Their CRGO and electrical steel are always stable in quality, delivered on time, and supported with excellent service. They truly provide professionalism and reliability, which makes our supply chain more efficient.</span></span></span> <link href="https://fonts.googleapis.com/css?family=Open Sans" rel="stylesheet" type="text/css">

<span style="color:#333333;"><span style="font-size:16px;"><span style="font-family:Open Sans;">Sheraxin supplies high-performance grain oriented electrical steel with low core loss. Our customers are very satisfied with the results. Communication is smooth, after-sales support is timely, and we highly trust them for long-term cooperation.</span></span></span> <link href="https://fonts.googleapis.com/css?family=Open Sans" rel="stylesheet" type="text/css">

<span style="color:#333333;"><span style="font-size:16px;"><span style="font-family:Open Sans;">This was our first time purchasing electrical steel from Sheraxin, and we are very satisfied. Packaging is well organized, products meet international standards, and their professional team gave us strong support. It was a pleasant cooperation.</span></span></span> <link href="https://fonts.googleapis.com/css?family=Open Sans" rel="stylesheet" type="text/css">

<span style="color:#333333;"><span style="font-size:16px;"><span style="font-family:Open Sans;">Sheraxin’s CRGO products show excellent consistency and fully meet our transformer production requirements. Their response is fast, problem-solving is proactive, and overall collaboration has been outstanding.</span></span></span> <link href="https://fonts.googleapis.com/css?family=Open Sans" rel="stylesheet" type="text/css">

CRGO Silicon Steel Application Scenarios

Power Transformers

Power Transformers

For renewable energy applications such as wind turbines and photovoltaic inverters, transformers with grain-oriented silicon steel cores reduce energy loss and extend service life. This helps improve renewable energy utilization efficiency and equipment reliability.
Distribution Transformers

Distribution Transformers

In distribution transformers, grain-oriented silicon steel enables low-noise and low-loss operation. It ensures reliable power supply in urban and industrial areas, enhancing both economic efficiency and system stability across medium- and low-voltage networks.
Large Generators

Large Generators

Generator cores made with grain-oriented silicon steel provide excellent magnetic properties, minimizing energy loss while improving performance and stability. It is extensively applied in thermal, hydro, and nuclear power plants to ensure efficient power generation.
High-Voltage Instrument Transformers

High-Voltage Instrument Transformers

Grain-oriented silicon steel is used in high-voltage instrument transformer cores to ensure precise measurement and protection. Its low hysteresis loss supports accurate monitoring and enhances the reliability of high-voltage power systems.
Railway Traction Equipment

Railway Traction Equipment

In electrified railway traction transformers, grain-oriented silicon steel minimizes core loss and improves efficiency. It provides stable and efficient power supply for high-speed trains, supporting both energy savings and safe railway operations.
New Energy Equipment

New Energy Equipment

For renewable energy applications such as wind turbines and photovoltaic inverters, transformers with grain-oriented silicon steel cores reduce energy loss and extend service life. This helps improve renewable energy utilization efficiency and equipment reliability.

Value-added Service

CRGO Grain-Oriented Silicon Steel Slitting and Cutting Processing

High Accuracy: Precise cutting quality is essential to maintain the no-load performance of transformers.
Tailored Dimensions: Available in widths from 10mm to 1,200mm and thicknesses between 0.18–0.35mm.
Fast Delivery: CRGO raw materials are kept in stock, with processing lead time of 5–7 working days.
Actual Weight Basis: Based on the real measured weight of CRGO electrical steel, not on theoretical calculations.