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Help CenterSilicon Steel & Silicon Steel Coil，35W250、50W470、50W800
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Silicon Steel， Grade: 50W470, 50W600, 50W800, 30Q120, 30Q130,NegotiableMOQ: 5 Metric Tons
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Silicon Steel Product Detailed Description
Silicon steel, also known as electrical steel, is an iron-silicon soft magnetic alloy with a silicon content of 0.5%–4.5% and carbon content less than 0.08%. It is the core functional material in the power, electrical machinery and energy industries, reputed as the chip of the power industry.
1. Chemical Composition & Basic Characteristics
Composition: Silicon (Si) 0.5%–4.5%; Carbon (C) ≤0.08%; balance Iron (Fe) and trace impurities.
Core Advantages:
High Magnetic Permeability: Easy magnetization with high magnetic induction (B50≈1.6–1.8T), enabling smaller iron core size.
Low Core Loss: Low hysteresis and eddy current loss, energy-saving and low temperature rise.
High Resistivity: 4–5 times higher than ordinary steel, suppressing eddy current effectively.
Good Machinability: Cold-rolled sheet with uniform thickness, smooth surface and excellent punching performance.
2. Product Classification (By Process & Grain Orientation)
2.1 Cold Rolled Non-Oriented Silicon Steel
Composition: Si 0.5%–3.5%, uniform magnetic properties in all directions.
Performance: Core loss P1.5/50≈2.0–4.0 W/kg; B50≈1.60–1.75 T.
Thickness: Mainstream 0.35 / 0.50 mm; 0.10–0.30 mm for high frequency & new energy applications.
Standard Grades (GB/T 2521): 35W250, 50W470, 50W800 (The number after W represents core loss; the lower the better).
Application: Rotating magnetic field equipment — industrial motors, new energy vehicle drive motors, generators, air conditioner compressors, water pump motors, etc.
2.2 Cold Rolled Grain-Oriented Silicon Steel (GO)
Composition: Si 2.9%–3.3%, grains highly oriented along the rolling direction.
Performance: Core loss P1.7/50≈0.9–1.7 W/kg; B800≈1.85–2.03 T with strong directionality.
Subdivision:
Conventional Grain-Oriented (CGO): Such as 30Q130, 35Q150, for distribution transformers.
High Magnetic Induction Grain-Oriented (Hi-B): Such as 27Q100, 23Q090, featuring lower core loss and higher magnetic induction, used for UHV and large-scale transformers.
Thickness: Conventional 0.27 / 0.30 / 0.35 mm; Ultra-thin 0.18–0.23 mm for high frequency & UHV scenarios.
Application: Alternating magnetic field equipment — power transformers, instrument transformers, reactors, UHV power transmission & transformation, data center power supply systems.
2.3 Hot Rolled Silicon Steel (Gradually Phased Out)
Composition: Si 1.0%–4.5%, thickness 2.0–4.0 mm, rough surface and low performance.
Current Situation: Basically replaced by cold-rolled silicon steel in China, only applied to a small number of low-end equipment.
3. Key Performance Parameters Explanation
Core Loss (P1.5/50, W/kg): Unit loss under 50Hz and 1.5T magnetic field; lower value means better energy saving.
Magnetic Induction Intensity (B50/B8, T): Magnetic induction under 5000A/m (B50) or 800A/m (B8); higher value reduces iron core volume.
Stacking Factor (%): Tightness between laminations, over 95% is optimal, affecting iron core filling rate.
Insulation Coating: Organic/inorganic coating on surface for eddy current prevention, rust protection and improved punching performance.
4. Brief Production Process
Steelmaking → Continuous Casting → Hot Rolling → Pickling → Cold Rolling → Annealing (Decarburization & Purification) → Insulation Coating → Finishing → Packaging
Cold Rolling: Precise thickness control (tolerance ±0.02 mm) with smooth surface.
Annealing: Relieve stress, optimize grain structure and reduce core loss; grain-oriented steel requires secondary high-temperature annealing.
Coating: Insulation & rust prevention; divided into semi-organic coating (conventional) and inorganic coating (high temperature resistant, dedicated for Hi-B steel).
5. Typical Applications & Grade Recommendation
5.1 Non-Oriented Silicon Steel (Motor Use Priority)
Home Appliance Motors: 50W800, 50W600 (0.5 mm, cost-effective).
Industrial Motors: 50W470, 35W300 (0.35 mm, high efficiency).
New Energy Vehicle Drive Motors: 35W250, 30W200, 25W180 (0.25–0.35 mm, low core loss, high frequency adaption).
High Frequency (400Hz+): 20W150, 15W100 (0.15–0.20 mm, ultra-thin & low loss).
5.2 Grain-Oriented Silicon Steel (Transformer Use Priority)
Distribution Transformer (10kV): 35Q150, 30Q130 (0.30–0.35 mm, high cost performance).
Power/Main Transformer (110kV+): 27Q100, 23Q090 (Hi-B, 0.23–0.27 mm, low loss & high energy efficiency).
UHV/Converter Transformer: 21Q085, 18Q080 (Ultra-thin Hi-B, 0.18–0.21 mm, top-grade low loss).
6. Supply Specifications & Packaging
Thickness: 0.10–0.50 mm (Non-oriented); 0.18–0.35 mm (Grain-oriented).
Width: Conventional 750–1250 mm, customized narrow width available.
Form: Steel coil (Inner diameter 508/610 mm) or fixed-length sheets.
Packaging: Moisture-proof and rust-proof, meeting export sea transportation standards.
7. Quality Standards
China: GB/T 2521-2021 Cold Rolled Non-Oriented and Grain-Oriented Electrical Steel.
International: IEC 60404, ASTM A665, JIS C2552.
8. Summary
Non-Oriented Silicon Steel: Isotropic, preferred for motors, balancing cost and efficiency.
Grain-Oriented Silicon Steel: Grain directional with low core loss, core material for transformers, rigid demand for UHV and new energy industries.
Core Selection Basis: Operating frequency, core loss limit, magnetic induction requirement, machinability (punching/welding) and cost balance.
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