0.20 mm CRNGO Electrical Steel Slit Coil with Core Loss P1.0/400 Below 12 W/kg
Sep 16, 2026
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What Is a 0.20 mm CRNGO Electrical Steel Slit Coil?
A 0.20 mm CRNGO (Cold-Rolled Non-Grain-Oriented) electrical steel slit coil is an ultra-thin, precision-cut magnetic alloy strip designed with isotropic properties to minimize energy loss in high-frequency rotating equipment and electric vehicle motors.
Key Characteristics and Breakdown
- 0.20 mm Thickness: An ultra-thin gauge that significantly reduces eddy current losses at high operational frequencies.
- CRNGO (Cold-Rolled Non-Grain-Oriented): The crystal grains are distributed randomly, ensuring uniform magnetic performance in all planar directions (isotropic).
- Slit Coil: A wide mother coil precision-trimmed into narrower, custom-width strips with clean edges and tight tolerances ready for stamping.
- Electrical/Silicon Steel: Contains added silicon (typically 1.5% to 3.5%) to raise electrical resistivity, lower coercivity, and decrease core energy loss
Send us your target thickness, slit width, burr limit and core-loss test condition (flux density, frequency, Epstein or SST, as-sheared or annealed) - you get a grade proposal, a slitting route and a quotation within 24 hours.
Technical Specification - 0.20 mm CRNGO Slit Coil, P1.0/400 < 12 W/kg
| Product name | 0.20 mm CRNGO electrical steel slit coil / narrow non-oriented strip |
|---|---|
| Material family | Cold-rolled non-oriented electrical steel (CRNGO / NGO / NOES), fully processed, finally annealed |
| Applicable standard | IEC 60404-8-8 class NO 20-12; EN 10303; cross-referenced to EN 10106, JIS C 2552, ASTM A677 |
| Nominal thickness | 0.20 mm (tolerance ±0.020 mm; tighter grades on request) |
| Slit width | 100 mm typical (20–1,000 mm available depending on parent coil), tolerance ±0.05 mm |
| Core loss requirement | P1.0/400 (W10/400) ≤ 12 W/kg, guaranteed maximum per lot |
| Loss test method | IEC 60404-2 Epstein 25 cm or IEC 60404-3 SST 25 cm; ASTM A343 available for North American drawings |
| Test condition | As-sheared specimens, one half longitudinal and one half transverse to rolling direction |
| Magnetic polarisation | B50 ≥ 1.60 T (typical declared range 1.60–1.68 T by grade) |
| Stacking factor | ≥ 93% typical guaranteed minimum for 0.20 mm high-frequency NO grades |
| Density | ≈ 7.60–7.65 kg/dm³ depending on grade chemistry |
| Insulation coating | Thin inorganic / semi-organic C5–C6A class, ≈0.5–1.5 µm per side; self-bonding varnish variants available |
| Burr height limit | ≤ 0.020 mm (≤ 10% of nominal thickness) |
| Camber | ≤ 1.5 mm per metre |
| Coil geometry | Pancake coil, ID 508 mm (400 mm for oscillate-wound), OD and coil weight to order |
| Weight reference | ≈ 0.153 kg per metre at 100 mm × 0.20 mm (density 7.65 kg/dm³) |
| Documentation | EN 10204 3.1 mill test certificate with measured loss values and heat numbers; RoHS / REACH statements on request |
| Packing | VCI film, moisture barrier, edge protection, export pallet or wooden case |
Slitting Quality Limits for 0.20 mm Electrical Steel
At 0.20 mm the surface insulation coating is only about 1–3 µm thick. A burr of 0.020 mm is roughly ten times that thickness, which is why burr - not width - is the number that governs quality in thin-gauge slitting. Tall burrs bridge adjacent laminations, create short paths for eddy currents, lower the stacking factor and produce local hot spots.
| Parameter | Working limit at 0.20 mm |
|---|---|
| Slit width tolerance | ±0.05 mm (or tighter by agreement) |
| Burr height | ≤ 0.020 mm, or ≤ 10% of thickness if stricter |
| Camber | ≤ 1–2 mm per metre |
| Edge condition | No roll-over, no wavy or cracked edge, coating intact |
| Residual curvature / shape | Within IEC 60404-8-8 limits |
| Slit-line tension | Minimum needed for stable web transport |
| Coil form | Pancake coil, ID 508 mm, agreed maximum OD and coil weight |
How to Specify and Buy 0.20 mm CRNGO Slit Coil
Almost every dispute around a specification like this one traces back to an order that named the thickness, the width and the grade, and left everything else to the supplier's discretion. Below is the short version of what belongs on the purchase order, followed by a block you can paste straight into an enquiry.
- Name the standard and the test condition together: class NO 20-12 per IEC 60404-8-8, loss measured per IEC 60404-2 (Epstein 25 cm) or IEC 60404-3 (SST 25 cm), half longitudinal and half transverse, as-sheared.
- State whether 12 W/kg is a guaranteed maximum per lot or a typical value - and require the measured value on the certificate, not merely the word compliant.
- Require loss specimens taken from the finished 100 mm slit coil, not the parent master coil.
- Specify burr height, camber and width tolerance numerically; adjectives such as precision or standard are not acceptance criteria.
- Fix the coil geometry - ID 508 mm pancake, maximum OD, maximum coil weight, oscillate-wound only if your line needs it.
- Expect a master-coil minimum: a 1,000 mm parent yields roughly nine or ten 100 mm strips after edge trim, so suppliers price the nested width mix and the trim loss, not just your strip.
- Budget first-order lead times in the 30–60 day band for a non-stock width, plus sampling; anything faster is inventory luck rather than process.
- Qualify a second source early - thin-gauge capacity is concentrated, and a single mill outage should not be able to stop your line.
Useful arithmetic before you quote freight and MOQ: at a density of 7.65 kg/dm³, one metre of 100 mm × 0.20 mm strip weighs about 0.153 kg, so 1,000 m of finished slit coil is roughly 153 kg and one tonne of material is about 6,500 m of 100 mm strip.
Applications of 0.20 mm CRNGO Slit Coil at 400 Hz
A thin isotropic strip with a 400 Hz loss cap is a medium-frequency rotating and static-machine material, and it is deliberately not a 50/60 Hz grid product. Its classic home is 400 Hz power systems: aircraft, naval and mobile ground-support transformers, converters and reactors. Thin-gauge non-oriented strip down to 0.20 mm is explicitly published for aeronautics and medical applications by at least one major European producer, while North American high-frequency non-oriented lines are advertised for aircraft generators and motors - a strong indication of where the 400 Hz specification originates.
Beyond aviation-derived power, the same material serves high-frequency transformer and inductor cores for converter topologies where the flux does not run neatly along one rolling direction, EI-type laminated reactors, and smoothing chokes built around wide-bandgap semiconductors.
On the rotating side, it appears wherever electrical frequency and rotational speed push the loss budget: high-speed permanent-magnet and induction machines, turbo machinery, machine-tool spindles, dental and medical handpieces, flywheel energy storage machines, and electric-vehicle auxiliary drives such as coolant pumps, HVAC blowers and electric compressors. The newest demand pockets - drone and eVTOL propulsion motors, robot joint and dexterous-hand actuators - combine thin gauge, adequate mechanical strength and low high-frequency loss, and are the reason thin-gauge capacity stays tight.
Why Source 0.20 mm CRNGO Slit Coil from GNEE New Material?
For 0.20 mm CRNGO Slit Coil we offer:
Genuine mill material with full traceability - mill test certificates supplied with every delivery
Flexible processing - slitting, cut-to-length, re-packing and export-grade seaworthy packaging
Technical support - grade selection guidance, core-loss comparison and material substitution advice from engineers familiar with transformer core design
Global logistics - reliable delivery to ports worldwide with consolidated container options
Whether you are designing a new high-efficiency distribution transformer, upgrading an existing core design, or simply need a steady supply of B27R080 coils for production, our team can provide quotations, mill certificates and technical data sheets tailored to your specification.
Request a quote or datasheet today - tell us your width, coil weight, coating and destination, and we will respond with a firm offer and mill availability.