Non-Oriented Silicon Steel Coil (Non-Oriented Silicon Steel Coil, N.O. Si Steel Coil), also known as non-oriented electrical steel coil, is an iron-silicon alloy with a silicon content of 0.5%–4.5%. Currently, Zhongxin Special Steel supplies multiple grades of non-oriented silicon steel coils – including high-grade (low core loss), medium-grade, regular-grade, and various insulation coating types – widely used in motors, compressors, generators, new energy vehicle drive motors, and other fields.
- Standards: GB/T 2521.1-2016, IEC 60404-8-4, ASTM A677, JIS C 2552, EN 10106
- Place of Origin: Jiangsu, China
- MOQ: 10 tons
Non-Oriented Silicon Steel Coil – Specifications
| Place Of Origin | China (Wuxi) |
|---|---|
| Certification | ISO9001, SGS, RoHS, CE, IEC, GB Standard Compliance, IATF16949 (Automotive Grade) |
| Type | Cold Rolled Non-Oriented Electrical Steel Coil |
| Hardness | Semi-hard / Fully processed / Annealed / Stress Relieved |
| Surface Treatment | Insulating Coated / Passivated / Color-coated / Self-bonding Coated |
| Color | Silver Grey (standard) |
| Nominal Thickness | 0.20mm, 0.23mm, 0.30mm, 0.35mm, 0.50mm, 0.65mm (custom thickness available) |
| Nominal Width | 600mm~1250mm (custom slitting available) |
| Coil Inner Diameter | 508mm (standard), 610mm (custom available) |
| Coil Weight | 1~15 tons (customized coil weight supported) |
| Coil Outer Diameter | 800mm~1800mm (customizable) |
| Sheet Length | Custom cut-to-length available (100mm~6000mm) |
| Executive Standard | GB/T 2521 (China), IEC 60404-8-4 (International), JIS C2552 (Japan), ASTM A867 (USA) |
| Grade Standard | General Purpose / Low Loss / High Efficiency / High Frequency / High Strength / Automotive Special Grades |
| Main Grades | 20W1200, 23W1500, 30W1700, 35W250, 35W300, 35W350, 35W400, 35W440, 35W550, 50W290, 50W310, 50W350, 50W400, 50W470, 50W600, 50W700, 50W800, 50W1000, 50W1300, 65W600, 65W700, 65W800, 65W1000, 65W1300, 65W1600 |
| Custom Grades | Customized grades available per customer's technical requirements (automotive, high frequency, special motor) |
| Coating Type | C0 Uncoated, C1 Thin Inorganic Coating, C2 Thick Inorganic Coating, C3 Organic Coating, C4 Composite Insulating Coating, C5 High Performance Coating, Self-bonding Coating, High Temperature Resistant Coating, High Insulation Coating |
| Front Coating Thickness | 1μm~8μm (customizable per grade) |
| Back Coating Thickness | 1μm~5μm (insulating layer) |
| Coating Performance | Excellent Insulation, High Temperature Resistance, Corrosion Resistance, Punchability, Weldability, Self-bonding Performance, Oil Resistance |
| Coating Color | Standard Silver Grey, Customized RAL Colors Available |
| Passivation Treatment | Chromate-free Passivation / Chromate Passivation (customizable) |
| Core Magnetic Property | Low Iron Loss, High Magnetic Induction, Low Exciting Power, High Frequency Low Loss |
| Iron Loss (P1.5/50) | 2.5W/kg~16.0W/kg (depending on grade, guaranteed value) |
| Iron Loss (P1.0/400) | ≤10W/kg (high frequency grades, guaranteed value) |
| Magnetic Induction (B50) | ≥1.50T~≥1.70T (guaranteed value, 5000A/m magnetic field strength) |
| Exciting Power (S1.5/50) | 1.0VA/kg~10.0VA/kg (typical value) |
| High Frequency Performance | Special low loss grades for 400Hz/1000Hz high frequency scenarios, suitable for aerospace, new energy vehicle motors |
| Thickness Tolerance | ±0.02mm (0.20/0.23/0.30/0.35mm thickness), ±0.03mm (0.50/0.65mm thickness) |
| Longitudinal Thickness Difference | ≤0.03mm |
| Transverse Thickness Difference | ≤0.02mm |
| Width Tolerance | 0mm~+2mm (no negative tolerance) |
| Flatness | ≤1.5% |
| 2m Camber | ≤1.0mm |
| Edge Burr | ≤0.03mm (after slitting) |
| Shearing Straightness | ≤0.5mm/m |
| Delivery Form | Coil, Cut Sheet, Stamped Parts, Custom Fabricated Parts |
Non-Oriented Silicon Steel Coil – Surface Treatment
Surface treatment of non-oriented silicon steel not only meets insulation and corrosion resistance requirements but also effectively ensures inter-laminar resistance, reduces eddy current losses, and prevents rust during transportation and storage.
Insulation Coating Types
- Inorganic Coating (Type S) : Phosphate-chromate based, withstanding up to 800°C and stress relief annealing. Suitable for cores that require annealing.
- Semi-organic Coating (Type A) : Inorganic + organic hybrid, withstanding up to 450°C. Good stampability and high inter-laminar resistance, ideal for high-speed stamping and stacking.
- Organic Coating (Type O) : Polymer resin coating, withstanding up to 200°C. Excellent lubrication, suitable for high-speed stamping dies.
Surface Appearance
- Ordinary Surface: No special treatment, retains the original annealed metal color.
- Skin-passed Surface: Smoother, denser surface obtained by temper rolling, improving stacking factor.
- Oil-coated Surface: Coated with anti-rust oil, providing short-term rust protection for long-term storage and sea transportation.
Non-Oriented Silicon Steel Coil – Value-Added Processing
Zhongxin Special Steel is a professional electrical steel processing service provider. We not only supply non-oriented silicon steel mother coils but also offer one-stop value-added processing services.
Non-Oriented Silicon Steel – Slitting
We provide high-precision steel coil slitting services, cutting wide coils into multiple narrow strips at your required width (accuracy ±0.1mm). The slit strips can be directly used for stamping laminations, wound cores, or tube manufacturing, helping you reduce process steps and improve production efficiency.
Non-Oriented Silicon Steel – Leveling & Cut-to-Length
Through leveling production lines, we flatten non-oriented silicon steel coils and shear them into flat sheets at fixed lengths. We supply pre-cut sheets in various dimensions (thickness 0.35–1.0mm, length 100–4000mm, length accuracy ±0.5mm), ready for direct use in stamping stators/rotors or as finished sheet material.
Non-Oriented Silicon Steel – Stamping (Stator & Rotor Cores)
We are equipped with high-precision high-speed stamping production lines that can directly stamp non-oriented silicon steel coils or sheets into motor stator and rotor laminations. We provide loose laminations, interlocked stacked cores, welded cores, and other forms, widely used in household appliance motors, industrial servo motors, new energy vehicle drive motors, etc.
Non-Oriented Silicon Steel – Annealing Treatment
For high-grade non-oriented silicon steel, we offer stress relief annealing services (750–850°C) under a nitrogen hydrogen protective atmosphere. This eliminates stamping stresses, restores and improves magnetic properties, and reduces core loss by 5%–15%.
Non-Oriented Silicon Steel – Recoating
For materials that require a change of coating type or coating repair, we provide roll coating recoating services. We can apply organic, semi-organic, or lead free inorganic insulation coatings to meet your special requirements for inter laminar resistance and thermal class.
Non-Oriented Silicon Steel – Wound Cores
Using non-oriented silicon steel coils, we produce ring shaped, rectangular, or special shaped wound cores on dedicated winding equipment. The products are used in instrument transformers, reactors, small transformers, sensors, and more.
Non-Oriented Silicon Steel – Laser Cutting
For small-batch, multi-variety, or complex shaped core requirements, we provide precision laser cutting services. No tooling is required, rapid prototyping is achieved, cutting accuracy is ±0.05mm, and there is no burr. Suitable for prototype trial production or special motor R&D.
Non-Oriented Silicon Steel Factory
Zhongxin Special Steel’s non oriented silicon steel coil factory is certified under ISO9001, ISO14001, IATF 16949 (automotive grade), and other standards. Our products comply with international standards including GB/T 2521.1, IEC 60404-8-4, ASTM A677, JIS C 2552, and EN 10106. We offer a diversified product range and provide OEM/ODM services.
Production Line
Our non oriented silicon steel production line is located in Wuxi City, Jiangsu Province, China, with an annual capacity of 600,000 tons. Our production scope includes non oriented silicon steel, grain oriented electric steel, finished electrical steel cores, and value added processing (slitting, leveling, stamping, annealing, winding, etc.). Common grades are available from stock, with delivery times ranging from 5 to 45 working days.
Packaging
We employ precision export grade packaging, including vertical/horizontal coil wrapping options. Each coil is wrapped in plastic film, moisture proof paper, galvanized iron sheet, stretch film, and steel strapping to ensure product integrity during long distance transport and harsh conditions. (Standard coil weights range from 3–8 tons. Wooden or steel pallets can be used upon request, with customizable packaging weights.)
Services
- Technical Consultation: Assisting you in selecting the most suitable grade, thickness, and coating type.
- Flexible Ordering: Free samples provided, supporting small trial orders and large scale procurement.
- Rapid Delivery: Stocked standard specifications with short production cycles.
- Quality Assurance: Third-party quality inspection support available (e.g., SGS, BV, TUV).
- Magnetic Testing: Epstein frame or single sheet tester reports (P1.5/50, B50, etc.) provided.
Application Cases
Zhongxin Special Steel’s non oriented silicon steel coils are exported to over 100 countries and regions worldwide, widely used in air conditioner compressors, washing machine motors, industrial fans, new energy vehicle drive motors, power tools, and more. We continuously collect feedback from customers across diverse industries to optimize product consistency.
Non-Oriented Silicon Steel Coil – Buying Guide
| Application Scenario | Recommended Grade (P1.5/50) | Recommended Thickness (mm) | Recommended Insulation Coating |
| Household Appliances (AC/Refrigerator Compressors) | W470, W600, W800 | 0.50 / 0.65 | Semi-organic (Type A) |
| Industrial Three phase Induction Motors | W600, W800 | 0.50 / 0.65 | Organic (Type O) |
| New Energy Vehicle Drive Motors | W250, W350, W470 | 0.35 / 0.50 | Inorganic (Type S, annealing tolerant) |
| Generators (Small / Wind Auxiliary) | W470, W600 | 0.65 / 0.80 | Semi-organic (Type A) |
| Power Tools (High speed Motors) | W350, W470 | 0.35 / 0.50 | Organic (Type O) |
| High frequency Applications (>400Hz) | W200, W250 | 0.35 / below 0.35 | Inorganic (Type S) |
Non-Oriented Silicon Steel vs. Grain-Oriented Silicon Steel vs. Ordinary Cold Rolled Sheet
| Characteristic | Non-Oriented Si Steel Coil (N.O. Si Steel) | Grain-Oriented Si Steel Coil (G.O. Si Steel) | Ordinary Cold Rolled Sheet (SPCC) |
| Composition | Fe + Si 0.5%~4.5% + Insulation coating | Fe + Si 3.0%~3.5% + Tension coating | Fe + C <0.12% |
| Grain Orientation | Random, uniform distribution | Highly aligned (Goss texture) | No requirement |
| Core Loss P1.5/50 (W/kg) | 1.5 – 6.0 | 0.45 – 0.90 (tested at 1.7T) | >20 |
| Maximum Permeability | 10,000 – 60,000 | 50,000 – 100,000+ | <5,000 |
| Magnetic Anisotropy | Weak (suitable for rotating machines) | Very strong (only in rolling direction) | Not applicable |
| Workability | Good, suitable for high speed stamping | Brittle, not suitable for piercing | Excellent |
| Main Applications | Motors, generators, compressors | Transformers, reactors | Structural parts, general electromagnets |