Products · Ultra-thin
Ultra-Thin Silicon Steel — High-Frequency, High-Speed Cores
Gauges from 0.05 to 0.20 mm, in both grain-oriented and non-oriented structures, for transformers, reactors and motors where thinner laminations cut eddy-current loss as frequency or rotor speed rises. Custom slitting to your width, direct from a China-based silicon steel strip supplier and manufacturer.
Two structures, one gauge range
Choose grain-oriented or non-oriented
Ultra-thin is a gauge, not a structure — pick grain-oriented for transformer cores where flux runs one way, or non-oriented for rotating motors and generators.
Grain-oriented
Ultra-Thin CRGO
Down to 0.05 mm, for high-frequency transformers and reactors where flux runs one way.
- Thickness0.05–0.20 mm
- Frequency400 Hz – high-freq
- GradeGT-050 · GT-100
Non-oriented
Ultra-Thin CRNGO
Down to 0.05 mm, for high-speed and high-frequency motors where the field rotates.
- Thickness0.05–0.20 mm
- Core loss P1.0/1000≤ 8–28 W/kg (typical)
- Core loss P1.5/50≤ 1.10–2.30 W/kg (typical)
Side by side
Which structure fits your application
A quick comparison to help you self-select before you send an enquiry.
| Property | Ultra-Thin CRGO | Ultra-Thin CRNGO |
|---|---|---|
| Thickness | 0.05–0.20 mm | 0.05–0.20 mm |
| Grain structure | Aligned (anisotropic) | Random (isotropic) |
| Typical grades | GT-050 · GT-100 | 05W-HF – 20W-HF |
| Best for | HF transformers & reactors | High-speed / HF motors |
Not sure which gauge you need? Send your operating frequency or motor speed and we’ll recommend a thickness — request a quote →
Strip specifications
Ultra-thin strip tolerances and dimensions
Common to both structures at 0.05–0.20 mm gauge — send your target width and we’ll confirm what’s workable before quoting.
| Supplied form | Precision slit strip (standard) · narrow coil or spool on request |
|---|---|
| Strip width | Slit to your width — commonly 15–600 mm for HF transformer, reactor and motor lamination use |
| Width tolerance | ± 0.1–0.3 mm on slit strip |
| Thickness tolerance | ± 0.015 mm |
| Surface insulation | C5 inorganic coating (standard) · C6 inorganic-organic on request |
| Edge camber | ≤ 1.0 mm per 2,000 mm on slit strip |
| Interlaminar resistance | ~5–50 Ω·mm² per lamination (Franklin, ASTM A717) |
| Test standards | GB/T 3655 & GB/T 2521 · IEC 60404 · EN 10107 · ASTM A343 / A876 |
Guaranteed values are issued on the mill test certificate with every order — request a quote →
Supplied forms
From ultra-thin strip to a finished iron core
As a China-based manufacturer, we don’t just ship coil — in-house slitting, stamping and core winding turn ultra-thin strip into a ready-to-install iron core.
01
Slit strip
Precision slit to width, wound on small coils or spools for your own HF transformer, reactor or motor line.
02
Stamped laminations
Die-cut or laser-cut E-I, C-core and motor laminations to drawing, from 0.05–0.20 mm gauge.
03
Toroidal & wound cores
Thin strip iron cores wound and annealed in-house — a finished, ready-to-install core, not just raw strip.
By application
Where ultra-thin gauges pay off
High-frequency transformers
Ultra-thin CRGO cuts eddy-current loss above 400 Hz.
Explore →EV & high-speed motors
Ultra-thin CRNGO for high-RPM rotors and stators.
Explore →Reactors
Thin-gauge CRGO for compact, low-loss reactor cores.
Explore →Drones & servo motors
Ultra-thin CRNGO for small, high-frequency drive motors.
Explore →How we work
From enquiry to your dock
A simple path from spec to delivery, built for overseas buyers.
Send your spec
Structure, thickness, width and frequency — or upload a drawing.
Quote in 24h
Pricing and availability within one business day.
Free samples
Test core loss and stampability, usually within a week.
Production & QC
Rolled, slit and tested to grade, with a mill certificate.
Export delivery
Moisture-proof packing and ocean freight to your port.
FAQ
Sourcing ultra-thin silicon steel from us
What counts as “ultra-thin” silicon steel?
Gauges from 0.05 to 0.20mm — thinner than our standard CRGO (0.23–0.35mm) and standard CRNGO (0.35–0.65mm) ranges. Thinner laminations cut eddy-current loss as frequency or rotor speed rises.
Should I choose grain-oriented or non-oriented ultra-thin steel?
Grain-oriented (CRGO) suits transformers and reactors where flux runs one way. Non-oriented (CRNGO) suits motors and generators where the field rotates. Send us your application and we’ll confirm.
What’s the minimum order quantity?
Ultra-thin gauges are typically made-to-order with a higher MOQ than standard thicknesses. Tell us your target volume and we’ll confirm what’s workable.
How fast can you quote and ship?
Quotes come within 24 hours. Ultra-thin gauges are made-to-order and typically take a few weeks; common grain-oriented and non-oriented standard gauges may ship faster.
Do you provide samples?
Yes — free samples are usually ready within about a week, so you can test core loss and stampability before committing.
Can you cut to my width?
Yes — precision slitting to width is standard on ultra-thin gauges, with ± 0.1–0.3 mm width tolerance and ± 0.015 mm thickness tolerance for stamping and winding.
Do you supply finished iron cores, or only raw strip?
Both. We supply precision slit strip for your own line, or in-house stamped, laser-cut and wound cores — including toroidal and C-cores — assembled and annealed from ultra-thin strip, ready to install.
Which standards and certifications do you hold?
Production runs under ISO 9001 and IATF 16949, with material to GB, EN, JIS or AISI grades and RoHS / REACH compliance. A mill test certificate ships with every order.
Why buyers choose Zhongxin
Mill-grade material, export-ready service
Wuxi Zhongxin Special Steel Co., Ltd. is a China supplier and manufacturer of grain-oriented, non-oriented and ultra-thin silicon steel — strip, laminations and finished iron cores — serving transformer, reactor and motor makers across Europe, the Americas, Asia and beyond.
Send your spec — get a quote in 24 hours
Share structure, thickness, width and frequency, or upload a drawing. Free samples available.
