Knowledge for Silicon Steel

1、Brief Introduction for Silicon Steel Coil/Sheet

(1) Silicon Steel Coil/Sheet, often called Electrical Steel Coil, is steel with silicon added to it. The addition of silicon to steel increases its electrical resistance, improves the magnetic flux strength, and reduces the steel’s hysteresis loss. Hysteresis is the lag between the times when a magnetic field is first generated or applied to the steel and when the field fully develops. The addition of silicon to steel makes the steel more efficient and faster in terms of building and maintaining magnetic fields. Thus, Silicon Steel Coil/Sheet improves the efficiency and effectiveness of any device using steel as a magnetic core material.


(2) The percentage of silicon added to Silicon Steel Coil/Sheet varies with its intended use up to 6.5 percent. For some items, such as high-efficiency motors and transformers, silicon comprises approximately 3 percent of the steel’s makeup. In other items requiring less efficiency, such as certain types of motor applications, the amount of silicon can be as low as 2 percent. Though expensive when compared to regular carbon steel, Silicon Steel Coil/Sheet can be produced with whatever percentage of silicon needed for a specific application.

Si%DensityHardnessResistivityYield StrengthTensile Strengththermal conductivity

Expansion Coefficient

(3) Silicon Steel Coil/Sheet is produced in strips or rolls, cut into the needed shapes and then heat-treated to control the size of the grain of the steel. Through control of the grain size, the hysteresis loss of the steel can be accurately controlled. The direction of the grain in Silicon Steel Coil/Sheet can also affect its efficiency. The grain can be oriented in one or double direction (CRGO Silicon Steel Coil/Sheet) through rolling to improve its density or the grain can be non-oriented and run in all directions (CRNGO Silicon Steel Coil/Sheet), making the Silicon Steel Coil/Sheet less expensive.

(4) Once the heat-treating process is completed, Silicon Steel Coil/Sheet is often coated or varnished, to further retard corrosion, then stacked to the needed thicknesses. These thicknesses are called laminations, and they may, or may not, be physically attached or bonded to one another. These stacked laminations serve as the cores of almost all electromagnetic devices in modern use, such as in transformers, magnetic coils and electrical motors.

2、Production Flow Chart of Silicon Steel Coil/Sheet


3、Designation Method of Silicon Steel Coil/Sheet


4、Features of Qualified Silicon Steel Coil/Sheet from CheeHo


(1) Excellent electromagnetic property

Low iron loss, high magnetic flux strength, as well as excellent magnetic anisotropy.

(2) Outstanding processability

High accuracy dimension and excellent mechanical property are convenient for the users to slit, cut and laminate.

(3) Preeminent dimensional accuracy

Good shape, smooth surface, uniform thickness, small intra-plate deviation and high lamination factor.

(4) Excellent surface coating property

Uniform surface coating with good adhesiveness, which can prevent peeling of coating during processing; interlaminar insulation property is outstanding; good weldability and heat resistance.

5、Application Fields Of Silicon Steel Coil/Sheet

Applicaton Fields
of Silicon Steel

CRGO Silicon SteelCRNGO Silicon Steel




Common TypeEfficient Type

Stress Relief

Iron Loss



Large Motor

Medium Motor

compressor Motor

General Motor

Small Precision Motor

Electric Vehicle Mot


High frequency operation

Large Transformer

Small Power Transformer
Instrument Transformer

Reactor and Magnetic

Power Switch

Welding Transformer

Voltage Regulator

Magnetic Sealer

Accelerator Electromagnetic

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