Ultra-thin Electrical Steel Manufacturer: Full 0.05–0.20 mm Product Family
Supplier of premium Ultra-Thin Grain-Oriented Silicon Steel
Wuxi Zhongxin Special Steel Co., Ltd. is a premier manufacturer specializing in high-performance ultra thin electrical steel (also widely recognized as thin-gauge grain-oriented electrical steel). Our full-range product family covers mainstream thicknesses of 0.05 mm, 0.08 mm, 0.10 mm, 0.15 mm, 0.18 mm, and 0.20 mm [cite: 3, 18], delivering optimal magnetic solutions for demanding high-frequency applications from 400 Hz to 20 kHz.
1. Choose Your Specification: Ultra Thin Electrical Steel Matrix
Quickly locate the ideal thin-gauge electrical steel thickness based on your operating switching frequency and application requirements.
| Thickness | Recommended Frequency | Typical Applications | B₈₀₀ (T) | Availability |
|---|---|---|---|---|
| 0.20 mm | 50 – 400 Hz | Distribution transformers, mid-freq reactors | ≥ 1.88 | Stock |
| 0.18 mm | 400 – 800 Hz | Traction transformers, UPS systems | ≥ 1.88 | Stock |
| 0.15 mm | 800 Hz – 2 kHz | Induction heating, servo drives | ≥ 1.88 | Stock |
| 0.10 mm | 2 – 10 kHz | EV OBC, PV / energy storage inverters, PCS | ≥ 1.85 | Stock |
| 0.08 mm | 5 – 15 kHz | Aerospace 400–800 Hz power, HF reactors | ≥ 1.83 | Made to Order |
| 0.05 mm | 10 – 20 kHz | MRI gradient amplifiers, CT HV inverters, High-speed motors | ≥ 1.80 | Custom |
*Selection rule of thumb: Every time the switching frequency doubles, drop one thickness step to mitigate loss. For high dB/dt applications, prioritize 0.10 mm ultra thin silicon steel and below.
2. Overcoming High-Frequency Challenges in Modern Power Electronics
As power electronics evolve toward higher switching frequencies, lighter weight, and greater power density—driven by EV on-board chargers (OBC), PV inverters, aerospace 400 Hz systems, and MRI imaging—operating frequencies have shifted from traditional 50 Hz into the kHz and tens of kHz range.
Conventional grain-oriented electrical steel (0.23mm, 0.27mm, or 0.30mm) faces severe physical bottlenecks under these high-frequency conditions:
- Exponential Core Losses: Eddy-current loss grows as a square function of frequency and thickness, leading to uncontrolled core temperature rise.
- Thermal Management Hurdles: Bulky cooling structures must be added, restricting downsizing and power density goals.
- Strict Efficiency Standards: Meeting demanding international regulations like GB 20052-2024, IEC 61558, and DOE Level VI Tier-1 becomes nearly impossible.
By engineering advanced ultra thin electrical steel with precise Goss-texture control and laser domain refinement , Wuxi Zhongxin provides the ultimate balance of low core loss, high magnetic flux density, excellent workability, and competitive cost.
3. Technical Advantages of Our Thin-Gauge Electrical Steel
3.1 Ultra-Low High-Frequency Iron Loss
According to the classical eddy-current loss formula:
P_e ∝ (B · f · t)² / ρ
Iron loss (Pe) is directly proportional to the square of the material thickness (t). Reducing strip thickness from 0.23 mm to 0.10 mm theoretically lowers eddy-current loss by approximately 81%. This makes ultra thin electrical steel the absolute dominant magnetic material in mid-to-high frequency ranges.
3.2 High Flux Density for Equipment Downsizing
Higher Saturation: With B800 ≥ 1.88 T, the magnetic-path cross-section can be reduced by 15–25% compared to amorphous (1.56 T) and nanocrystalline (1.25 T) alloys.
High Stacking Factor: A stacking factor of ≥ 95% ensures thin-gauge laminations maintain tight stacking, avoiding effective-area loss from gaps.
Exceptional Uniformity: A Coefficient of Variation (CV) ≤ 3% across the strip ensures reliable batch-to-batch magnetic performance.
3.3 Laser Domain Refinement (HiB-LS Process)
Our in-house laser domain refinement production line further cuts high-frequency iron loss by 5–10% on 0.15 mm – 0.20 mm grades, ensuring zero impact on the stacking factor or insulating coating integrity.
3.4 Premium Surface Properties & Mechanical Value
| Property | Specification | Engineering Value |
|---|---|---|
| Surface Coating | C-3 / C-5 / C-6 inorganic + semi-organic insulating film | Class H temperature rating (180 °C) |
| Insulation Resistance | ≥ 100 Ω·cm² (GB/T 2522) | Suppresses inter-lamination eddy currents |
| Coating Adhesion | Passes 0T bend test | Can be wound to Ø 20 mm minimum ID |
| Flatness & Burr | Flat strip, burr ≤ 0.02 mm | Ideal for precision stamping and laser cutting |
| Width / Cut Tolerance | ± 0.05 mm | Reduces lamination misalignment |
4. Full Technical Datasheet & Grade Cross-Reference
Every shipped coil includes a third-party-verifiable Certificate of Analysis (COA).
| Thickness | P₁..₇/₅₀ | P₁.₅/₄₀₀ | P₁.₀/₁ ₖ | P₀.₅/₂ ₖ | P₀.₂/₅ ₖ | P₀.₁/₁₀ ₖ | B₈₀₀ (T) | Coating |
|---|---|---|---|---|---|---|---|---|
| 0.20 mm | ≤ 0.85 | ≤ 14.0 | — | — | — | — | ≥ 1.88 | C-5 |
| 0.18 mm | ≤ 0.80 | ≤ 12.0 | ≤ 35 | — | — | — | ≥ 1.88 | C-5 |
| 0.15 mm | ≤ 0.75 | ≤ 10.0 | ≤ 28 | ≤ 18 | — | ≤ 25 | ≥ 1.88 | C-5 |
| 0.10 mm | — | ≤ 7.5 | ≤ 20 | ≤ 12 | ≤ 8 | ≤ 12 | ≥ 1.85 | C-5/C-6 |
| 0.08 mm | — | ≤ 6.0 | ≤ 16 | ≤ 9 | ≤ 6 | ≤ 9.5 | ≥ 1.83 | C-6 |
| 0.05 mm | — | ≤ 4.5 | ≤ 12 | ≤ 7 | ≤ 4.5 | ≤ 7.5 | ≥ 1.80 | C-6 |
*Units: .Our series complies fully with global standards, including GB/T 2521.1, EN 10107, JIS C 2553, and ASTM A876.
5. Multi-Dimensional Material Comparison
Why choose ultra thin electrical steel over alternative soft magnetic materials? Here is how it compares across the 400 Hz to 20 kHz spectrum:
- < 400 Hz: Conventional grain-oriented steel (0.23mm-0.30mm) is sufficient and cost-effective.
- 400 Hz – 10 kHz: Ultra thin electrical steel provides the best price-to-performance ratio, pairing high working flux density ($B_8 \ge 1.85\text{ T}$) with low losses and superb workability.
- 10 kHz – 20 kHz: 0.05 mm ultra thin steel directly competes with amorphous metal ribbon; selection depends on core volume constraints versus manufacturing budgets.
- > 50 kHz: Nanocrystalline materials excel, though they come with high structural brittleness and increased unit costs.
6. Customization & Value-Added Processing Services
To streamline your supply chain, Wuxi Zhongxin provides comprehensive, downstream precision processing services for our ultra thin electrical steel product line:
- Precision Slitting: Width range from 5 mm to 1,000 mm with a ±0.05 mm tolerance.
- Laser Cutting & Stamping: Custom EI, UI, or C-type lamination stamping. Burr heights are strictly kept $\le 0.02\text{ mm}$.
- Wound Core Manufacturing: Automated step-butt and toroidal wound core production down to a 20 mm minimum inner diameter.
- Custom Insulation Coating: C-3, C-5, and C-6 insulation layer /services/custom-coatingapplications with a strict 1–4 μm thickness control.
7. Real-World Application Case Studies
7.1 High-Frequency Transformers (1 kHz – 20 kHz)
Perfect for EV OBC, PV / energy storage inverters, and UPS isolation transformers[cite: 63].
Upgrade Case Study (11 kW OBC, 0.23 mm → 0.10 mm):
- Iron loss: Reduced from 3.8 kW to 1.2 kW (68% decrease).
- Full-load temperature rise: Dropped from 80 K to 45 K.
- Core weight: Reduced from 4.2 kg to 2.9 kg (31% reduction).
7.2 Aerospace 400 Hz Power Systems
At 400 Hz and 1.5 T, our 0.08 mm grade delivers a low iron loss of≤ 6.0 W/kg. This enables an overall power density above 2.5 kW/kg, fully meeting strict MIL-STD-704F standards.
7.3 High-End Medical Equipment (MRI / CT Transformers)
Low high-frequency loss combined with high saturation flux density enables faster gradient-current response, lower ripple, and simpler cooling structures—significantly increasing equipment Mean Time Between Failures (MTBF).
8. Frequently Asked Questions (FAQ)
Q1: What is the primary advantage of ultra thin electrical steel vs amorphous ribbon?
A: Ultra thin electrical steel maintains a significantly higher working flux density (B8 ≥ 1.85 T vs ~1.30 T for amorphous), which allows engineers to downsize transformer cores by 15-25%. Additionally, electrical steel is mechanically robust and easy to stamp or cut, whereas amorphous ribbon is extremely brittle and difficult to stack. In the 400 Hz – 10 kHz range, ultra thin steel offers the absolute best price-performance ratio..
Q2: Do you support laser domain refinement for your thin-gauge sheets?
A: Yes. We operate an advanced in-house laser domain refinement line (HiB-LS process). It reduces high-frequency iron loss by an extra 5% to 10% on our 0.15 mm, 0.18 mm, and 0.20 mm steel grades without affecting stacking density or insulation coating integrity.
Q3: What are your shipping MOQs and lead times for overseas buyers?
A: For international FOB shipments (via Shanghai or Ningbo ports), our standard MOQ is 5 tons with a 30-day production lead time[cite: 105, 159]. However, we offer free 5–10 kg rush sample coils for R&D prototyping, dispatched within 3 days complete with a verified COA.
Q4: How do you guarantee batch-to-batch consistency for global orders?
A: Every shipment includes a third-party-verifiable Certificate of Analysis (COA). Our online thickness gauges control tolerances within ± 2 μm. Within-coil Coefficient of Variation (CV) is ≤ 3%, and cross-batch CV is ≤ 5%. We provide an unconditional return or replacement policy if test results deviate from specifications.