Grain-Oriented (CRGO) › Standard CRGO
Standard CRGO — 0.23/0.27/0.30/0.35mm Grain-Oriented Electrical Steel
Our everyday grain-oriented line, rolled in the four thicknesses transformer makers order most: 0.23, 0.27, 0.30 and 0.35 mm, in grades M4 to M6 and their GB equivalents 23Q90 and 27Q120. Supplied as coil or cut-to-length sheet, to GB, EN, JIS and AISI standards.
By form
Supplied the way your line runs
Coil
CRGO coil
Master coils and mill-edge coils, wound to your inner diameter and coil weight, around 5 t.
Request coil quote →
Sheet
CRGO sheet
Cut-to-length sheet in standard and custom dimensions, ready for stamping or shearing.
Request sheet quote →
Slit strip
CRGO slit strip
Precision slit to width with tight tolerance, for stamping and lamination lines.
Request strip quote →By thickness & grade
Every Standard CRGO thickness, one page
Pick your gauge, check the grade against your spec sheet, and send us the coil or sheet dimensions you need.
| Thickness | GB grade | AISI equiv. | Core loss P1.7/50 | Induction B8 | Best for |
|---|---|---|---|---|---|
| 0.23 mm | 23Q90 | M4 | ≤ 0.90 W/kg | ≥ 1.88 T | Highest-efficiency small & medium cores |
| 0.27 mm | 27Q120 | M5 | ≤ 1.20 W/kg | ≥ 1.85 T | General-purpose power & distribution cores |
| 0.30 mm | 30Q120 | M6 | ≤ 1.20 W/kg | ≥ 1.83 T | Larger cores, cost-balanced |
| 0.35 mm | on request | M6 | ≤ 1.30 W/kg (typ.) | ≥ 1.80 T | Larger, lower-frequency cores |
Need the lowest possible loss instead? Hi-B & laser-scribed CRGO pushes core loss down to 0.85 W/kg — see the Hi-B line →
Technical & physical properties
Surface, tolerance and coil specifications
Beyond core loss and induction, these are the properties engineers usually ask for when qualifying a coil.
| Surface insulation | C5 inorganic coating (standard) · C6 inorganic-organic on request |
|---|---|
| Stacking factor | ≥ 0.95 (0.23–0.27 mm) · ≥ 0.97 (0.30–0.35 mm) |
| Coil width range | 8–1,250 mm, slit to your width |
| Coil weight | Approx. 5 t per coil, mill or mother coil |
| Coil inner diameter | 508 mm (20″) standard, 610 mm on request |
| Thickness tolerance | ± 4% of nominal thickness |
| Width tolerance | ± 1.0 mm on slit strip |
By application
Matched to your core
Power transformers
M4/M5 grades for efficient power cores.
Explore →Distribution transformers
M5/M6 grades balancing loss and cost.
Explore →Reactors
Standard CRGO for shunt & series reactor cores under continuous magnetizing current.
Enquire →Instrument transformers
Tight-tolerance CRGO for CT/VT cores needing stable accuracy class.
Enquire →Grade equivalents
Standard CRGO across GB, EN, JIS & AISI
Working from a European or Japanese spec sheet? Use this cross-reference to find the matching Standard CRGO grade, or check the full chart for less common codes.
Equivalents, at a glance
How we work
From enquiry to your dock
A simple path from spec to delivery, built for overseas buyers.
Send your spec
Thickness, grade, width and coating — 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.
Packaging & export
Ready for ocean freight
What ships with every Standard CRGO order, and what to expect on terms and timing.
Coil packaging
VCI-wrapped coils
Moisture-proof kraft paper and vapor-corrosion-inhibitor wrap, banded with edge and coil-eye protection.
Sheet & strip packaging
Palletised sheet & strip
Strapped on wooden pallets or steel racks, corner-protected for forklift handling.
Container loading
Container & bulk loading
Coils secured with dunnage and lashing, loaded by container or in bulk for break-bulk shipment.
01
Packaging
Moisture-proof, seaworthy packing on coils or pallets, with edge protection, coil-eye protection and vapor-corrosion-inhibitor wrap. Sheet and strip ship on wooden pallets or steel racks, banded and corner-protected.
02
Documentation
Every shipment includes a mill test certificate, packing list, commercial invoice and certificate of origin. Fumigation certificate provided for wooden packaging on request.
03
Payment terms
T/T with 30% deposit and 70% before shipment, or L/C at sight. Other terms negotiable for repeat orders.
04
Shipping & Incoterms
FOB Shanghai or Ningbo as standard; CFR and CIF quoted on request. Typical lead time is 2–4 weeks production plus 25–45 days ocean freight, depending on destination port.
FAQ
Sourcing Standard CRGO from us
What’s the difference between M4, M5 and M6 CRGO?
The grades track thickness and loss: M4 is our thinnest at 0.23 mm with the lowest loss, M5 sits at 0.27 mm, and M6 covers 0.30–0.35 mm. Thinner gauges cost more but cut no-load loss further.
Should I choose Standard CRGO or Hi-B CRGO?
Standard CRGO (M4–M6) covers most power and distribution transformer cores at a lower price point. Hi-B and laser-scribed grades like 23ZH90 push induction and loss further for premium, low-loss designs — see the Hi-B CRGO line.
Which thickness should I use for my core?
It depends on core size and loss target: 0.23–0.27 mm suits smaller, higher-efficiency cores; 0.30–0.35 mm suits larger cores where material cost matters more than the last fraction of a watt. Send your rating and we’ll recommend a gauge.
Do you supply coil, sheet or strip?
All three — master coils or mill-edge coils to your inner diameter and weight, cut-to-length sheet in standard and custom dimensions, and precision slit strip to tight width tolerance for stamping and lamination lines.
What surface coating and tolerances do you use?
Standard CRGO ships with a C5 inorganic surface coating for interlaminar insulation; C6 inorganic-organic is available on request. Thickness tolerance is ±4% of nominal, width tolerance ±1.0 mm on slit strip.
Is Standard CRGO suitable for reactors or instrument transformers?
Yes — reactor cores under continuous magnetizing current and CT/VT cores needing a stable accuracy class both run on Standard CRGO grades. Tell us the duty cycle or accuracy class and we’ll confirm the right grade and gauge.
Can you match my GB, EN, JIS or AISI grade?
Yes — 23Q90, 27Q120 and 30Q120 are our GB equivalents to M4, M5 and M6. Send your spec or datasheet and we’ll confirm the match.
What’s the minimum order quantity and lead time?
MOQ depends on grade, thickness and width. Common gauges often ship from stock in days; non-standard widths typically take a few weeks. Tell us your target volume and we’ll confirm.
Do you provide free samples?
Yes — free samples are usually ready within about a week, so you can test core loss and stampability before committing.
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 CRGO, export-ready service
Wuxi Zhongxin Special Steel Co., Ltd. is a Chinese manufacturer and exporter of grain-oriented silicon steel, serving transformer makers across Europe, the Americas, Asia and beyond.
Send your Standard CRGO spec — get a quote in 24 hours
Share thickness, grade, width and coating, or upload a drawing. Free samples available.