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Help CenterSilicon Steel & Silicon Steel Coil，IEC 60404、ASTM A677、JIS C2552、DIN EN 10106
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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 soft magnetic iron-silicon alloy with low carbon content. Its silicon content ranges from 0.5% to 4.8% and carbon content ≤0.003%. It is the most widely used core material for electromagnetic equipment, accounting for over 80% of all soft magnetic materials globally.
Adding silicon to steel increases resistivity and magnetic permeability, significantly reducing core loss (heat loss under alternating magnetic field), coercivity and magnetic aging. Featuring precise dimensional tolerance, flat surface and excellent stamping performance, silicon steel is widely adopted to manufacture iron cores for power systems, new energy equipment, home appliances and industrial control devices.
2. Main Product Categories & Characteristics
2.1 Cold Rolled Grain Oriented Silicon Steel (CRGO / GOES, for transformers)
Composition & Production ProcessWith approximately 3% silicon content, it is produced via hot rolling, normalization, double cold rolling, high-temperature grain-oriented annealing and insulating coating treatment. Grains are aligned uniformly along the rolling direction, resulting in strong magnetic anisotropy, with optimal magnetic performance only along the rolling direction.
Core AdvantagesUltra-low core loss along rolling direction, high magnetic induction (B₈ ≥ 1.89T), low magnetostriction and low noise. Core loss in transverse direction is about 3 times that of rolling direction. Lamination must follow the rolling direction during cutting.
Standard Thickness0.23mm, 0.27mm, 0.30mm, 0.35mm; ultra-thin 0.05mm / 0.10mm for high-frequency miniature transformers.
Common Grades23SQGD085, 27SQGD090, 30Q120, 35Q135, Hi-B high magnetic induction laser scribed grain oriented silicon steel.
Application ScenariosPower main transformers, distribution transformers, reactors, instrument transformers, UHV converter transformers, iron cores for photovoltaic and energy storage inverters.
2.2 Cold Rolled Non-Grain Oriented Silicon Steel (CRNGO / NGOES, for motors)
Composition & Production ProcessSilicon content ranges from 0.8% to 4.5% with randomly distributed grains. Magnetic properties are uniform in all directions without obvious anisotropy, allowing stable performance after cutting at any angle.
Core AdvantagesIsotropic magnetic property, superior stamping performance and high stacking factor. It is classified into low, medium and high grades; smaller grade figures represent lower core loss and higher energy efficiency.
Standard Thickness0.35mm, 0.50mm (general industrial use); 0.20mm / 0.25mm ultra-thin for high-speed new energy motors.
Common Grades
High grade (new energy vehicle motors): 35W230, 35W250, 35W270
Medium grade (industrial motors & fans): 50W300, 50W400, 50W470
Regular grade (home appliance compressors): 50W600, 65W800
Application ScenariosNew energy vehicle drive motors, wind power generators, servo motors, water pump & fan motors, air conditioner compressors, UPS inductors, small and medium-sized power frequency transformers.
2.3 Hot Rolled Silicon Steel (Phased out, only for old equipment)
Thickness 0.5mm / 1.0mm, featuring large thickness tolerance, high core loss and high energy consumption. Its production and procurement are gradually restricted domestically, not recommended for new projects.
3. Core Technical Performance Indicators
3.1 Magnetic Properties (Key Standards for Purchase Inspection)
Core Loss P: P1.7/50 (grain oriented steel, loss in W/kg under 1.7T, 50Hz); P1.5/50 (non-grain oriented steel, loss in W/kg under 1.5T, 50Hz). Lower value means higher energy efficiency.
Magnetic Induction B: B8 for grain oriented steel, B50 for non-grain oriented steel. Higher value enables smaller core size and higher power density.
Stacking Factor: ≥0.95, directly determines the effective magnetic cross-sectional area of iron core.
Magnetic Aging: Minimal attenuation of magnetic performance during long-term service, suitable for equipment with continuous long-hour operation.
3.2 Mechanical Machinability
Thickness Tolerance: ±0.003 ~ ±0.005mm, flat sheet without wave edge or warpage.
Stamping Performance: Moderate hardness, no burr or cracking during high-speed stamping, compatible with laser cutting and die cutting.
Tensile Strength: 380 ~ 480MPa, stable bending and coiling processing.
3.3 Insulating Coating Performance
Double-sided / single-sided factory insulating coating (Type C2 / C3 / C4 / C6):
Insulation resistance ≥50Ω·cm², resistant to short-time high temperature up to 200℃.
Grade 0 coating adhesion, no peeling during stamping and lamination.
Dielectric withstand voltage 800V/μm, preventing inter-sheet short circuit and overheating.
4. Applicable Standards
Chinese National Standards: GB/T 2521.1-2016 (Non-Grain Oriented), GB/T 2521.2-2016 (Grain Oriented), Baosteel Enterprise Standard Q/BQB 480
International Standards: IEC 60404, ASTM A677, JIS C2552, DIN EN 10106Each batch is attached with original mill material certificate, magnetic test report and factory quality guarantee certificate; third-party re-inspection is acceptable.
5. Available Supply Forms
Master Steel CoilsStandard width 900~1250mm, inner diameter 508mm, single coil weight 3~12 tons.
Slitted Narrow CoilsCustom slitting from 20mm to 1200mm width, minimum small coil order 100kg.
Cut-to-Length Silicon Steel SheetsFlat sheets in standard sizes 500×1000mm, 1000×2000mm; custom special cutting available.
Deep Processed Finished ProductsSupport one-stop processing including stamping iron cores, EI lamination, motor stator & rotor stacks.
6. Packaging, Logistics & Lead Time
6.1 Export Standard Marine Anti-Rust Packaging
Inner layer wrapped with anti-rust oil paper and waterproof plastic film, fixed by steel strips externally, reinforced wooden pallet at bottom. One 20GP container loads 25~27 tons, moisture-proof, anti-collision and anti-seawater corrosion, suitable for ocean transportation.
6.2 Minimum Order & Delivery Time
Regular grades in stock: MOQ 500kg, shipped from Tianjin Port within 5-7 working days.
Custom ultra-thin or special narrow slitting: 10-15 working days.
Full container bulk orders: 7-10 working days.
6.3 Payment Terms
30% TT advance deposit, full balance paid before shipment. LC letter of credit is not acceptable.
7. Product Advantages
Full range of grades in stock: Authorized first-tier supplier of Baowu Steel, ready inventory of grain oriented, medium and high grade non-oriented silicon steel.
Low-loss & energy-saving: High-grade silicon steel reduces no-load loss of equipment by 15%~30%, complying with global energy efficiency standards.
Superior processing adaptability: Smooth surface and uniform thickness, greatly lowering abrasion of stamping dies.
Stable traceable quality: Complete magnetic inspection report for each batch, strictly controlled impurities without fluctuation in magnetic performance.
Supporting deep processing: One-stop service including slitting, cut-to-length and iron core stamping.
8. Applicable Industries
Power Grid Industry: Distribution transformers, substation instrument transformers, reactors
New Energy Industry: New energy vehicle drive motors, wind power generators, photovoltaic inverters, energy storage converters
Industrial Manufacturing: Servo motors, air compressors, fans, water pumps, welding equipment
Home Appliance Industry: Air conditioner compressors, refrigerator motors, washing machines, small household power supplies
Industrial Control Electronics: UPS uninterruptible power supply, high-frequency inductors, iron cores for medical nuclear magnetic electromagnetic shielding
9. Storage & Operation Precautions
Store in dry and ventilated warehouse; avoid outdoor exposure to rain and humid environment to prevent surface oxidation and rust.
Cutting and lamination of grain oriented silicon steel must follow the rolling direction; cross-direction use will sharply increase core loss.
Avoid heavy bending during stamping to prevent damage to insulating coating; clear metal debris on surface before lamination.
Check integrity of anti-rust oil paper every 6 months for long-term storage.
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