Product Forms › CRGO Steel Coil
CRGO Steel CoilMaster coil & mill-edge coil for export, grades M3–M6 · 23Q110–35Q155
Grain-oriented silicon steel supplied as raw coil — full-width master coil or as-rolled mill-edge coil, wound to your inner diameter and coil weight. Available across our full Standard CRGO thickness range, C5-coated, with a mill test certificate on every coil.
Two coil types
Master coil or mill-edge coil
Both are raw, unslit CRGO coil — the difference is edge condition and width. Tell us which your line is set up to run.
Master coil
Master coil
The full-width mother coil straight off the mill, wound to your target inner diameter and coil weight — the raw form for buyers who slit to width themselves.
- Width100–1,000 mm as rolled
- Coil weightApprox. 2–8 t (up to ~10 t mother coil)
- Inner diameter508 mm (610 mm on request)
Mill-edge coil
Mill-edge coil
Supplied at the as-rolled width with the natural mill edge retained — no slitting operation, so it costs less when your line accepts mill-edge width directly.
- WidthAs rolled, no re-slit
- CoatingC5 inorganic standard · C6 on request
- Best forLines that don’t need a custom width
By thickness & grade
Every Standard CRGO gauge, in coil
Pick your gauge, check the grade against your spec sheet, and send us the coil width and weight you need.
| Thickness | GB grade | AISI equiv. | Core loss P1.7/50 | Induction B8 | Best for |
|---|---|---|---|---|---|
| 0.23 mm | 23Q110 | M3 | ≤ 1.10 W/kg | ≥ 1.85 T | Highest-efficiency small & medium cores |
| 0.27 mm | 27Q120 | M4 | ≤ 1.20 W/kg | ≥ 1.85 T | General-purpose power & distribution cores |
| 0.30 mm | 30Q130 | M5 | ≤ 1.30 W/kg | ≥ 1.80 T | Larger cores, cost-balanced |
| 0.35 mm | 35Q155 | M6 | ≤ 1.55 W/kg | ≥ 1.78 T | Larger, lower-frequency cores |
Full grade datasheets and application detail live on Standard CRGO; for the lowest-loss coil see Hi-B & laser-scribed CRGO.
Coil dimensions & tolerances
What to confirm before you order
| Coil width range | 100–1,000 mm as rolled, slit 8–1,250 mm to your width |
|---|---|
| Coil weight | Approx. 2–8 t per coil (5 t typical single-grade), up to ~10 t mother coil |
| Coil inner diameter | 508 mm (20″) standard, 610 mm on request |
| Thickness tolerance | ± 4% of nominal thickness |
| Width tolerance | ± 1.0 mm as rolled · ± 0.1–0.3 mm on slit-to-width coil |
| Surface insulation | C5 inorganic coating standard · C6 inorganic-organic on request |
Ordering more than one form? See the full product forms overview for sheet, slit strip and laminations specs.
By application
Matched to your core
Power transformers
M3/M4 coil for efficient power cores.
Explore →Distribution transformers
M5/M6 coil balancing loss and cost.
Explore →Wound & step-lap cores
Master coil for shops that slit and wind cores in-house.
Enquire →Reactors & instrument transformers
Tight-tolerance CRGO coil for reactor and CT/VT cores.
Enquire →How we work
From enquiry to your dock
A simple path from spec to delivery, built for overseas buyers.
Send your spec
Grade, thickness, coil weight and inner diameter — 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 and tested to grade, with a mill certificate.
Export delivery
Moisture-proof packing and ocean freight to your port.
Packaging & export
Seaworthy packing to any port
01
Packaging
Coils in moisture-proof VCI wrap with edge and coil-eye protection, cradled on a wooden pallet.
02
Documentation
Mill test certificate, packing list, commercial invoice and certificate of origin; others on request.
03
Payment terms
T/T with 30% deposit and balance before shipment, or irrevocable L/C at sight.
04
Shipping & lead time
FOB Shanghai or Ningbo; CFR and CIF on request. 2–4 weeks production plus 25–45 days ocean freight.
FAQ
Sourcing CRGO coil from us
What’s the difference between master coil and mill-edge coil?
Master coil is the full-width mother coil as it comes off the mill, wound to your target inner diameter and weight — used by buyers who slit to width in-house. Mill-edge coil is supplied at that same as-rolled width with the natural mill edge retained, so no slitting operation is needed if your line accepts that width directly.
What coil weight and inner diameter do you supply?
Standard inner diameter is 508 mm (610 mm on request). Coil weight runs approximately 2–8 t per coil, with mother coil up to about 10 t. Tell us your target weight and we’ll confirm what’s workable.
Can you slit master coil to a custom width?
Yes — in-house slitting to 8–1,250 mm, with width tolerance of ±0.1–0.3 mm and camber controlled to ≤5 mm per 2,000 mm. See our slitting service guide for the full process and tolerances.
Which thicknesses and grades are available in coil?
0.23, 0.27, 0.30 and 0.35 mm, grades M3–M6 and their GB equivalents 23Q110–35Q155. For lower-loss Hi-B and laser-scribed coil, see the grain-oriented range.
What surface coating and tolerances do you use?
C5 inorganic surface coating standard, with C6 inorganic-organic available on request. Thickness tolerance is ±4% of nominal; width tolerance is ±1.0 mm as rolled, tightening to ±0.1–0.3 mm on slit-to-width coil.
What’s the minimum order quantity for coil?
MOQ depends on grade, thickness and width — a full coil typically runs 2–8 t. Tell us your target volume and we’ll confirm what’s workable.
How fast can you quote and ship coil?
Quotes come within 24 hours. Common grades and widths often ship from stock in days; custom-slit widths typically take a few weeks depending on volume.
Do you provide free samples before a coil order?
Yes — free samples are usually ready within about a week, so you can test core loss and stampability before committing to a full coil.
Why buyers choose Zhongxin
Mill-grade CRGO coil, 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 CRGO coil spec — get a quote in 24 hours
Share thickness, grade, coil weight and inner diameter, or upload a drawing. Free samples available.
