Products › Product Forms
Electrical Steel Product FormsCoil, sheet, slit strip & laminations — grain-oriented, non-oriented & ultra-thin
Every grade we roll — grain-oriented (CRGO), non-oriented (CRNGO) and ultra-thin — ships in the same four forms: master coil, cut-to-length sheet, precision-slit strip, or stamped laminations to your drawing. This page covers the dimensions, tolerances and typical uses for each form so you can spec the right one before you request a quote.
Four forms, one supplier
Supplied the way your line runs
Order raw coil and process it yourself, or let us cut, slit or stamp to your spec before it ships. All four forms are available across grain-oriented, non-oriented and ultra-thin silicon steel.
01
Coil
Master and mill-edge coils wound to your inner diameter and coil weight — the raw form for lines that slit or stamp in-house.
02
Sheet
Cut-to-length sheet in standard and custom dimensions — ready for shearing, stamping or sample evaluation.
03
Slit strip
Precision slit to width with tight camber control, for progressive-die stamping and C-core or toroidal winding.
04
Laminations
Die-cut or laser-cut E-I, mitred and toroidal laminations, stamped to your drawing and ready to stack.
Form 01 · Coil
Master coil & mill-edge coil
The raw form for buyers who slit, cut or stamp on their own line. Wound to your inner diameter and target coil weight, C5/C6-coated, with a mill test certificate on every coil.
| Property | Grain-oriented (CRGO) | Non-oriented (CRNGO) |
|---|---|---|
| Coil width range | 100–1,000 mm as rolled, slit 8–1,250 mm to your width | Up to approx. 1,250 mm, slit to your width |
| Coil weight | Approx. 2–8 t per coil (5 t typical single-grade), up to ~10 t mother coil | Approx. 3–8 t per coil |
| Coil inner diameter | 508 mm (20″) standard, 610 mm on request | 508 mm (20″) standard, 610 mm on request |
| Thickness tolerance | ± 4% of nominal thickness | ± 0.02 mm |
| Width tolerance | ± 1.0 mm as rolled · ± 0.1–0.3 mm on slit strip | ± 1.0 mm as rolled · camber ≤ 5 mm / 2,000 mm |
Need a specific grade at this form? See grain-oriented coil or non-oriented coil for full thickness and grade options.
Form 02 · Sheet
Cut-to-length sheet
Coil sheared to your specified length — for buyers who don’t run coil-fed stamping, or who need flat blanks for shearing, laser cutting or sample evaluation before committing to a coil order.
Standard dimensions
Common lengths held for fast turnaround at standard coil widths, in both grain-oriented and non-oriented grades.
- WidthSame as coil, 100–1,250 mm
- LengthStandard or custom, cut to spec
- CoatingC3 / C5 / C6 to grade
Custom dimensions
Send a drawing or a target width and length — sheared to your specification with standard shearing tolerance, tighter tolerance available on request.
- Typical useShearing, stamping blanks, samples
- GradesAny grade we manufacture
- MOQLower than full-coil orders
Evaluating before a coil order? Sheet is also the fastest way to get a sample for core-loss and stampability testing.
Form 03 · Slit strip
Precision-slit strip
Coil slit to a narrow, tight-tolerance width for progressive-die stamping lines, or for winding directly into C-cores and toroidal cores without a separate stamping step.
| Width tolerance | ± 0.1–0.3 mm, tighter to drawing |
|---|---|
| Camber | ≤ 5 mm per 2,000 mm length (typical) |
| Minimum slit width | From approx. 8 mm |
| Surface | Edge burr and edge condition controlled for coil winding and die feed |
| Typical use | Stamping-line feedstock · C-core & toroidal core winding · transformer core lamination stacks |
Winding your own cores rather than stamping? Slit strip in grain-oriented grades is what most step-lap and wound-core shops order directly — see Standard CRGO or Hi-B CRGO.
Form 04 · Laminations
Stamped & laser-cut laminations
Send a drawing and we stamp to it — die-cut for volume runs, laser-cut for prototypes and low volumes or where die cost isn’t justified. Insulation coating and stacking factor are matched to your thickness and grade.
Die-cut laminations
Progressive-die stamping for volume production — E-I, U-I, mitred step-lap and standard motor lamination profiles.
- Best forVolume production runs
- ProfilesE-I, U-I, step-lap, rotor/stator
Laser-cut laminations
No tooling cost — used for prototypes, low-volume runs, and toroidal or non-standard profiles that are impractical to die-stamp.
- Best forPrototypes, low volume, toroidal cores
- Lead timeNo die build required
Stacking factor by thickness
Stacking (lamination) factor falls as gauge gets thinner — factor it into your core-window calculation at ultra-thin thicknesses. Per IEC 60404-13.
Choosing a form
Match the form to how you build
Not sure whether to order coil, strip or finished laminations? Start from what happens next on your line.
Building a transformer core
Step-lap and wound cores are usually built from grain-oriented slit strip or coil, wound or stacked in-house to your core design.
Grain-oriented range →
Stamping motor or generator cores
Rotor and stator laminations run on non-oriented strip or sheet, punched on your own progressive die or ours.
Non-oriented range →
Winding a toroidal or C-core yourself
Narrow, tight-camber slit strip is the form most wound-core shops order — no stamping step needed.
Request slit strip →
Need finished parts, not raw strip
Send your drawing and we stamp or laser-cut to it — you receive ready-to-stack laminations, not coil.
Send a drawing →Every form is available across GB, EN, JIS and AISI grades — browse all grades → or check the grade equivalents chart.
Packaging & export
Seaworthy packing, whatever the form
Coil, wrapped & palletised
Moisture-proof VCI film with edge and coil-eye protection, cradled on a wooden pallet for handling.
Staged & strapped for export
Coils banded and staged at the mill, ready for pickup and outbound transport.
Loaded for outbound transport
Coils secured on a flatbed for the trip from mill to port.
Container & bulk loading
Coils secured with dunnage and lashing; sheet, strip and laminations palletised or crated to fit.
01
Coil
Moisture-proof VCI wrap with edge and coil-eye protection, eye-to-sky or eye-to-wall on wooden pallets.
02
Sheet & strip
Corner-protected, strapped pallets or crates sized to the shipment.
03
Laminations
Stacked and banded to drawing, or boxed loose — packaging confirmed against part geometry.
04
Documentation
Mill test certificate, packing list, commercial invoice and certificate of origin with every shipment.
How we work
From enquiry to your dock
A simple path from spec to delivery, built for overseas buyers.
Send your spec
Grade, thickness, form (coil / sheet / strip / laminations) and dimensions — or upload a drawing.
Quote in 24h
Matched grade and form, pricing and availability within one business day.
Free samples
Test core loss and stampability, usually within a week.
Production & QC
Rolled, slit, sheared or stamped and tested, with a mill certificate.
Export delivery
Moisture-proof packing and ocean freight to your port.
FAQ
Sourcing electrical steel by form
What forms do you supply electrical steel in?
Four forms across every grade: master coil, cut-to-length sheet, precision-slit strip, and stamped or laser-cut laminations. All four are available in grain-oriented (CRGO), non-oriented (CRNGO) and ultra-thin silicon steel.
What’s the difference between slit strip and cut-to-length sheet?
Slit strip is cut along the coil’s length to a narrow width and stays coiled — used for progressive-die stamping or direct core winding. Sheet is cut across the coil to a fixed length and lies flat — used for shearing, single-blank stamping or sample evaluation.
Can you supply stamped laminations to my drawing?
Yes — die-cut for volume production, or laser-cut for prototypes and low volumes where tooling cost isn’t justified. Send your drawing with grade and thickness and we’ll quote both routes.
What stacking factor should I expect at my thickness?
It falls as gauge gets thinner: roughly ≥0.97 at 0.50–0.65 mm, ≥0.965 at 0.27–0.30 mm, ≥0.955 at 0.23 mm, and ≥0.90 at ultra-thin 0.10–0.20 mm gauges. Build the applicable factor into your core-window calculation, especially at thin gauges.
What coil sizes and weights do you supply?
Standard inner diameter is 508 mm (610 mm on request). Coil weight runs approximately 2–8 t for grain-oriented and 3–8 t for non-oriented, up to about 10 t for grain-oriented mother coil. Width ranges up to roughly 1,250 mm slit to your specification.
Do you supply the same forms for CRGO and CRNGO?
Yes — coil, sheet, slit strip and laminations are available across both families, and across ultra-thin gauges. Tolerances differ slightly by family; see the tables above.
What tolerances do you hold on width and thickness?
Thickness tolerance is roughly ±4% of nominal (±0.02 mm on common CRNGO gauges). Width tolerance is about ±1.0 mm as rolled, tightening to ±0.1–0.3 mm on precision-slit strip, with camber controlled to ≤5 mm per 2,000 mm.
What’s the minimum order quantity by form?
Full coils carry the highest MOQ; cut sheet and slit strip run smaller since they’re processed from stock or smaller lot sizes. Laminations depend on your part size and whether we die-cut or laser-cut. Tell us the form and target volume and we’ll confirm what’s workable.
How fast can you quote and ship?
Quotes come within 24 hours for any form. Common grades and widths in coil or sheet often ship from stock in days; slit strip, custom sheet sizes and laminations typically take a few weeks depending on volume.
Why buyers choose Zhongxin
Every form, mill-grade material, export-ready service
Wuxi Zhongxin Special Steel Co., Ltd. is a Chinese manufacturer and exporter of grain-oriented, non-oriented and ultra-thin silicon steel, supplying coil, sheet, slit strip and stamped laminations to transformer and motor makers across Europe, the Americas, Asia and beyond.
Send your spec — get a quote in 24 hours
Share grade, thickness and the form you need (coil, sheet, slit strip or laminations), or upload a drawing. Free samples available.
