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Help CenterSilicon Steel & Silicon Steel Coil，30Q120、30Q130、27Q110、27Q120、35WW230、35WW250、35WW300、35WW360、35WW440
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Silicon Steel，Grade: 50W470, 50W600, 50W800, 30Q120, 30Q130,NegotiableMOQ: 5 Metric Tons
1. Product Overview
Silicon steel, also known as electrical steel, is a low-carbon soft magnetic alloy steel with a silicon content ranging from 0.5% to 4.8%. It features low core loss, high magnetic induction, low hysteresis loss and stable electromagnetic performance, serving as an indispensable core magnetic material in the power, electrical and new energy industries. The addition of silicon element increases the resistivity of steel and reduces eddy current loss. Meanwhile, it possesses excellent stamping, shearing and stacking machinability. Primarily used for manufacturing iron cores of various motors, transformers, reactors, transformers and generators, it directly determines the energy consumption, efficiency and operational stability of electrical equipment, and is widely applicable to power frequency, variable frequency and other electromagnetic working scenarios.
Cold-rolled silicon steel dominates the current market and has completely replaced traditional hot-rolled silicon steel. According to grain orientation characteristics, it is divided into two major categories: non-oriented silicon steel and grain-oriented silicon steel. It complies with the national standard GB/T 2521-2021 and is compatible with international standards such as IEC, ASTM and JIS.
2. Core Product Classification & Differences
2.1 Cold-Rolled Non-Oriented Silicon Steel
With randomly arranged grains and isotropic electromagnetic properties, it delivers consistent magnetic performance in all directions. It is suitable for rotating electrical equipment with continuously changing magnetic field directions, acting as the core material for motors and generators, and is the most widely used type of silicon steel in the market.
Common Thickness: 0.20mm, 0.27mm, 0.30mm, 0.35mm, 0.50mm (mainstream industrial standard sizes)
Grade Naming Rule: Thickness + W + Core Loss Value. Example: 50W470 (0.5mm thickness, core loss ≤ 4.70W/kg under 50Hz and 1.5T conditions)
Performance Features: Uniform magnetic permeability, excellent blanking performance, high stacking factor, low noise and moderate loss
Application Scenarios: Industrial motors, variable frequency motors, new energy vehicle motors, fans, water pumps, generators, small transformers, reactors and household appliance motors
2.2 Cold-Rolled Grain-Oriented Silicon Steel
Grains are regularly oriented along the rolling direction, achieving ultra-low core loss and high magnetic induction in the rolling direction, while showing weaker performance in the vertical direction. It is exclusively designed for static high-voltage power transmission and transformation equipment with unidirectional alternating magnetic fields.
Common Thickness: 0.23mm, 0.27mm, 0.30mm, 0.35mm (special thin sizes for high-voltage power industry)
Grade Naming Rule: Thickness + Q + Core Loss Value. Example: 30Q120 (0.3mm thickness, core loss ≤ 1.20W/kg under standard working conditions)
Performance Features: Ultra-low no-load loss, high magnetic saturation strength, remarkable energy-saving effect and superior electromagnetic stability
Application Scenarios: State Grid transformers, distribution transformers, high-voltage reactors, instrument transformers, large-scale power transmission and transformation equipment, energy storage transformers
2.3 Hot-Rolled Silicon Steel (Obsolete / Niche Spare Material)
Featuring outdated production technology, poor surface accuracy, high core loss and unstable performance, hot-rolled silicon steel has been basically phased out in domestic power and motor industries. It is only used for maintenance and replacement of low-end obsolete equipment with no value for mass production and commercial application.
3. Mainstream Grades & Performance Parameters
3.1 Common Grades of Non-Oriented Silicon Steel (General Industrial Use)
Standard test conditions: 50Hz, 1.5T; all parameters are industry standard limit values
50W800 / 50W600: General-efficiency type with high cost performance, suitable for ordinary household appliances, small general motors, fans and water pumps
50W470 / 50W350: Medium-efficiency type with balanced performance, suitable for conventional industrial motors, reducers and medium & small-sized generators
35WW300 / 30WW230: High-efficiency thin-gauge type with low loss, suitable for variable frequency motors, new energy auxiliary motors and precision electrical equipment
20WW180 / 20WW150: Ultra-high-efficiency ultra-thin type with ultra-low core loss, suitable for high-end servo motors and high-speed precision motors
3.2 Common Grades of Grain-Oriented Silicon Steel (Power Industry Special Use)
30Q130 / 30Q120: Conventional power grade, suitable for ordinary distribution transformers and medium & small-sized reactors
27Q110 / 27Q100: High-efficiency energy-saving grade with low loss, suitable for energy-saving power transformers and industrial & commercial power transmission and transformation equipment
23Q090: Ultra-precision energy-saving grade with ultra-low core loss, suitable for high-standard State Grid transformers, high-voltage energy storage equipment and high-end power transmission and transformation projects
4. Core Technical Indicators & Quality Standards
4.1 Key Electromagnetic Properties
Core Loss: The core evaluation indicator. A lower value means lower equipment heat generation, lower energy consumption and better energy-saving effect, serving as the primary basis for silicon steel grade classification.
Magnetic Induction: A higher value indicates stronger magnetic conductivity of the iron core, which can reduce equipment volume and weight and improve power density.
Stacking Factor: ≥0.95 for high-end products. The flat and uniform-thickness sheets minimize lamination gaps, effectively improving iron core filling rate and equipment efficiency.
4.2 Dimensional Accuracy & Surface Quality
Thickness tolerance: Within ±0.02mm with uniform thickness across the entire coil without thickness deviation
Standard width: 1000mm, 1200mm, 1250mm; custom slitting of any narrow width is available
Surface condition: Uniform and dense insulating coating without peeling, scratches, oxide scales or warping. Excellent insulation performance effectively prevents eddy current short circuit between laminations.
4.3 Mechanical Machinability
The material features moderate hardness and good toughness without brittle cracking. It supports high-speed blanking, shearing, bending and lamination processing, with small blank burrs and high flatness. It adapts to automated assembly line mass production and greatly improves iron core processing efficiency.
4.4 Applicable Standards
National Standard: GB/T 2521-2021 Cold Rolled Electrical Steel Strip and Sheet; International Standards: IEC 60404, ASTM A677, JIS C2552. All products are supplied with original mill test reports, electromagnetic performance test reports and third-party SGS inspection reports.
5. Types of Surface Insulating Coatings
The professional electrical insulating coatings on silicon steel balance insulation, heat resistance, adhesion and stamping performance, mainly divided into three types:
Class A Coating (General Type): Suitable for conventional motors and ordinary transformers with high cost performance, meeting insulation requirements of general working conditions
Class B Coating (Heat-Resistant Type): High temperature and humidity resistant, suitable for electrical equipment operating in high-temperature and closed industrial environments
Class C Coating (Precision Self-Bonding Type): Enables self-bonding of laminations without additional riveting or welding, suitable for high-end precision iron cores, micro motors and high-speed motors
6. Industry Application Fields
6.1 Applications of Non-Oriented Silicon Steel
New Energy Industry: Drive motors for new energy vehicles, vehicle water pump motors, wind power generators, matching motors for photovoltaic inverters
Industrial Equipment: Industrial variable frequency motors, servo motors, reducers, air compressors, fans, water pumps, generator sets
Household Electrical Appliances: Iron cores for air conditioners, refrigerators, washing machines, fans, compressors and other household motors
Precision Equipment: Instruments and meters, small instrument transformers, precision electromagnetic components
6.2 Applications of Grain-Oriented Silicon Steel
Power Transmission & Transformation: Power transformers and distribution transformers of all levels of State Grid and China Southern Power Grid
High-Voltage Electrical Equipment: High-voltage reactors, power instrument transformers, rectifier transformers, energy storage transformers
High-End Industrial Equipment: Large-scale industrial power transformation equipment, rail transit power supply transformers, power transmission and transformation equipment for new energy power stations
7. Product Form, Packaging & Delivery Instructions
7.1 Product Delivery Forms
Original hot-rolled / cold-rolled coils, flattened sheets, slit narrow strips and customized stamped iron cores. Custom fixed-length flattening, precise slitting and edge deburring are available per customer requirements.
7.2 Packaging Methods
Domestic Delivery: Steel coils with waterproof and rust-proof packaging, steel strip reinforcement, moisture-proof film covering and end protection to prevent collision, rust and deformation during transportation
Export Delivery: Double-layer moisture-proof film + rust-proof paper + steel strip fastening + wooden pallet fixing, suitable for long-distance sea transportation. Effectively avoids moisture oxidation and mechanical damage, meeting customs inspection and overseas warehousing standards.
7.3 Delivery Cycle & MOQ
Conventional in-stock specifications: Delivery within 3–7 working days
Ultra-thin, ultra-precision special grades and customized slit specifications: Delivery within 7–15 working days
Flexible MOQ, supporting full coil ordering and split small-batch ordering, adapting to mass production and sample trial orders for small and medium-sized manufacturers
7.4 Quality Warranty Service
100% random inspection on dimensions, surface condition and electromagnetic performance before delivery, with complete original MTC (Mill Test Certificate) provided. Products are free of delamination, rust and performance defects. Return and replacement is supported for quality problems under non-human damage conditions, with full after-sales guarantee.
8. Core Product Advantages
Low core loss & low energy consumption: Effectively reduces heat generation and energy consumption of electrical equipment, complying with industrial energy conservation, emission reduction and carbon neutrality requirements
Stable magnetic performance & high efficiency: Uniform electromagnetic performance greatly improves the working efficiency of motors and transformers, and reduces equipment volume and weight
Excellent machinability: Flat sheet surface, good stamping and shearing performance and high stacking factor, adapting to automated high-speed production
Reliable insulation & long service life: Dense professional insulating coating with temperature and moisture resistance, effectively extending the service life of electrical equipment
Complete specifications & wide adaptability: Covers full series of general, high and ultra-high efficiency grades, meeting all application scenarios including civil, industrial, power and new energy fields
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