Silicon Steel Coil/Strip


Silicon steel/Electrical steel mainly consists of grain-oriented electrical steel and non-oriented electrical steel. Grain-oriented electrical steel widely used in transformer industry. Non-oriented electrical steel widely used in motor industry.

The Grain-oriented silicon steel is a kind of electrical steel with its easy magnetization direction parallel to the rolling direction and a silicon content of around 3%. The grain-oriented silicon steel can be divided into two major categories including common grain-oriented silicon steel and high magnetic induction grain-oriented silicon steel. It is mostly applicable to the field of power transmission (such as transformers) and is an important functional metal material in the electrical power, electronic and military industries.

Grain-oriented silicon steel has long been known as the art work of steel, which are technologically sophisticated and technically complicated.

Fields of Application

Fields of applicationGrain-oriented electrical steelNon-oriented electrical steel
Series GSeries PSeries RSeries ASeries AHSeries ARSeries AT
RotatorsLarge-sized motors

Medium-sized motors

Compressor motors

General motors

Small-sized precision motors

Motors for electric cars

Static deviceHigh-frequency motors

Large-sized transformers

Small-sized power transformers
Transformers for instruments

Reactors and magnetic amplifiers

Power switches

Transformers for welding

Voltage regulators

Magnetic sealers

Electromagnetic devices for accelerators

Material Selection - Grain-oriented electrical steel

VarietiesCommon typeHigh induction typeDomain refinedhigh induction type
Large motors
Large transformers
Medium and small transformers
Distributing transformers
Voltage regulator
Reactor and magnetic amplifier
IF transformer

Mutual inductor
TV transformer
Radio transformer
Radio broadcast transformer


Features of Silicon Steel
-Great Electromagnetic Performance
The silicon steel comes with low iron loss and high magnetic induction, especially HiB steel which has lower iron loss and higher magnetic induction.

- Good Shape

The material is often made in strips. Slight longitudinal and transverse thickness difference ensures a high lamination factor.
-Insulating Coating
Uniform color, excellent insulative, high adhesion strength, high heat resistance, excellent processability, and superior corrosion resistance. Our silicon steel sheet is available in multiple insulating coating options, which have been reaching and RoHS certified that harmful matter content complies with domestic and overseas regulations on environmental protection.
-Excellent Processability
Accessible to die-cut, with high dimensional accuracy.
-Surface Quality
Our silicon steel features a smooth surface, without defects such as rust, rolling marks, holes, cold-lap,folds, bubbles, etc

Mechanical Property

Mechanical Property
GradeYeild Strength(N/mm2)Ultra-TensionStrength(N/mm2)Ductility(%)Hardness(HV1

Insulating Coating

Insulating Coating
Coating typesM11M21
ComponentChromium containing , semi organic coatingChromium free, semi organic coating
Coating thickness(μm)0.7~1.50.8~5.0
Interlayer resistance(Ω•mm2 /slice)≥100≥100
Adhesive propertyClass A or class BClass A or class B
Punching propertyExcellentExcellent
Antirust propertyExcellentExcellent
Heat resisting propertyResistant annealing at 750 C, N2 protection, for 2hAnnealing resistance in general

-Production Process

Grain-oriented electrical steel


Units Commonly Used and Conversion Table


Inspection Certificate



Q: What is silicon steel? What is electric steel?

A: Electric steel is magnetically soft material among functional material, and is most wildly used. Generally speaking, silicon steel refers to electric steel with silicon content between 0.5%~6.5% Si. The general electric steel also includes the part that contains little silicon (Si<0.5%). However, nowadays the 2 concepts are not clearly defined, and can be interchangeable.

Q: Classification of electric steel

A: It is roughly classified into hot-rolled electric steel and cold-rolled electric steel. Zhongyuantong steel produces cold-rolled electric steel, which can be further classified into oriented electric steel and non- oriented electric steel.

Q: What is magnetic field?

A: The space field for the acting force between the two magnetic poles is described as magnetic field strength H, the unit is A/m (Ampere/meter). It is the driving primary field produced by external input electric current after the electric steel is made into motor.

Q: Difference between electric steel B50A300 and B50AR300

A: B50A300 is whole processed product. It can be put into use after being purchased or annealing (reducing the loss through stress relief and construction perfection). But B50AR300 must go through annealing before use.

Q: Difference between whole processed silicon steel and semi- processed silicon steel

A: The target of whole processed non-oriented silicon steel annealing is to achieve targeted magnetic property (guarantee value), with the consideration of mechanical property required by stamping and the surface coating. The target of semi-processed product annealing is to achieve the mechanical property required by stamping. The manufactured magnetic property is so poor that the user has to do annealing and bluing to the magnet core so as to achieve the required magnetic property and surface insulation. There can be coating on the semi-processed non-oriented electric steel (applied in Japan market) or no coating (applied in American market, CRML).

Q: Influence of electric steel hardness on product process property

A: The mechanical property of the material has direct influence on the processing property. Various electric steel materials are used in various industries according to their characters. Processing mold and mold adjustment are critical to processing property. Zhongyuantong steel maintains the stability of product mechanical property and guarantees the user’s processing property.

Q: How does Zhongyuantong inspect the hardness of silicon steel material?

A: According to the silicon steel character (thickness, material), Zhongyuantong steel inspects with HV1 standard. There is no conversion relation between Vickers Hardness, Brinell Hardness, Rockwell Hardness, and other Hardness, but there is empirical reference.

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