Products · Electrical Steel
Grain-Oriented Electrical Steel — CRGO, Hi-B & Ultra-Thin GO
Grain-oriented electrical steel is cold-rolled silicon steel with its grains aligned to the rolling direction, giving very low core loss and high induction along that axis — the standard core material for power and distribution transformers. This is our full grain-oriented family: conventional CRGO (CGO), high-permeability Hi-B, laser-scribed domain-refined grades, and ultra-thin 0.10–0.20 mm strip, rolled from 0.10 to 0.35 mm and cross-referenced to GB/T 2521, EN 10107, JIS C 2553 and AISI M-3–M-6.
Product families
Four grain-oriented lines, one supplier
All four are grain-oriented silicon steel. They differ in grain alignment, thickness and domain treatment — and therefore in core loss, induction and price.
Standard CRGO
GB 23Q110–35Q155, AISI M-4–M-6. The cost-balanced workhorse for general power and distribution transformer cores at 50/60 Hz.
Hi-B CRGO
GB 23QG085–30QG120, EN …-23P/27P. Sharper grain alignment for ~20–30% lower loss and B8 up to ~1.93 T — for efficiency-driven power transformers.
Laser-Scribed CRGO
Hi-B base with laser domain refinement, EN M085-23N / M090-23N class. Lowest loss in the family; scribing survives stress-relief annealing.
Ultra-Thin GO
0.10 / 0.15 / 0.18 / 0.20 mm strip for 400–2000 Hz transformers, traction auxiliaries and aerospace conversion, where eddy-current loss dominates.
Supplied forms
Coil, sheet, slit strip or laminations
Grain-oriented steel is stocked as master coil and processed in-house to your order — cut to length, slit to width, or stamped to a lamination drawing.
Coil
Master and mill-edge coils wound to your inner diameter and coil weight.
Sheet
Cut-to-length sheet in standard and custom lengths, ready for shearing or stamping.
Slit strip
Precision slit to width with tight camber, for stamping and C-core winding.
Laminations
Die-cut or laser-cut E-I, mitred and toroidal laminations to drawing.
By thickness & grade
The grain-oriented range, across four standard systems
Family-level reference values. P1.7/50 = core loss at 1.7 T, 50 Hz (W/kg); B8 = induction at 800 A/m (T). Ultra-thin GO is specified at medium-frequency loss instead.
| Thickness | GB grade | AISI | EN 10107 | JIS C2553 | Core loss | Induction B8 | Best for |
|---|---|---|---|---|---|---|---|
| 0.10–0.20 mm | Ultra-thin GO thickness spec | — | — | — | P1.0/400 ≈ 12–22 W/kg | ≥ 1.88 T | Medium-frequency transformers, 400–2000 Hz |
| 0.23 mm | 23QG080 Hi-B, domain-refined | M-3 (≈) | M090-23N | 23ZDKH080 | P1.7/50 ≤ 0.85 W/kg | ≥ 1.90 T | Lowest-loss high-efficiency power cores |
| 0.23 mm | 23QG085 Hi-B | M-3 (≈) | M085-23P | 23ZH85 | P1.7/50 ≤ 0.90 W/kg | ≥ 1.90 T | Highest-efficiency power transformer cores |
| 0.23 mm | 23Q110 Conventional | M-4 (≈) | M110-23N | 23G110 | P1.7/50 ≤ 1.05 W/kg | ≥ 1.85 T | High-efficiency small & medium cores |
| 0.27 mm | 27QG090 Hi-B | M-4 (≈) | M111-27P | 27ZH90 | P1.7/50 ≤ 1.00 W/kg | ≥ 1.89 T | Premium distribution & power cores |
| 0.27 mm | 27Q120 Conventional | M-5 (≈) | M140-27S | 27G120 | P1.7/50 ≤ 1.20 W/kg | ≥ 1.83 T | General-purpose power & distribution cores |
| 0.30 mm | 30QG110 Hi-B | M-5 (≈) | M125-30P | 30ZH110 | P1.7/50 ≤ 1.15 W/kg | ≥ 1.88 T | Large power cores with low no-load loss |
| 0.30 mm | 30Q130 Conventional | M-6 (≈) | M150-30S | 30G130 | P1.7/50 ≤ 1.35 W/kg | ≥ 1.80 T | Larger cores, cost-balanced |
| 0.35 mm | 35Q155 Conventional | M-6 (≈) | M170-35S | 35G155 | P1.7/50 ≤ 1.55 W/kg | ≥ 1.78 T | Large, lower-frequency cores and reactors |
Guaranteed single-grade values are issued on the mill test certificate. Send your target datasheet and we confirm the closest match before quoting.
Technical & physical properties
Common to the grain-oriented range
By application
Matched to your transformer core
Power Transformers
Hi-B and domain-refined 0.23/0.27 mm grades where no-load loss drives lifetime cost.
Distribution Transformers
Conventional CGO and Hi-B 0.27/0.30 mm balancing loss against material economics for volume builds.
Medium-Frequency Transformers
Ultra-thin 0.10–0.20 mm GO for 400–2000 Hz power supplies and traction auxiliaries.
Reactors & Instrument TXs
Conventional CRGO for shunt reactor cores and tight-tolerance CT/VT cores holding a stable accuracy class.
Grade equivalents
Grain-oriented grades at a glance
Working from a European or Japanese spec? Match it to the Chinese equivalent below, or send a datasheet for confirmation.
- 23QG080 (GB, DR) ≈ M-3 (AISI) ≈ M090-23N (EN) ≈ 23ZDKH080 (JIS) · 0.23 mm
- 23QG085 (GB, Hi-B) ≈ M-3 (AISI) ≈ M085-23P (EN) ≈ 23ZH85 (JIS) · 0.23 mm
- 23Q110 (GB) ≈ M-4 (AISI) ≈ M110-23N / M120-23S (EN) ≈ 23G110 (JIS) · 0.23 mm
- 27Q120 (GB) ≈ M-4 (AISI) ≈ M140-27S (EN) ≈ 27G120 (JIS) · 0.27 mm
- 30Q130 (GB) ≈ M-5 (AISI) ≈ M150-30S (EN) ≈ 30G130 (JIS) · 0.30 mm
- 30QG110 (GB, Hi-B) ≈ M-5 (AISI) ≈ M125-30P (EN) ≈ 30ZH110 (JIS) · 0.30 mm
- 35Q155 (GB) ≈ M-6 (AISI) ≈ M170-35S (EN) ≈ 35G155 (JIS) · 0.35 mm
Equivalence is a working guide, not full interchangeability — confirm against actual test data before design release.
How we work
From enquiry to delivered coil
Send your spec
Thickness, grade, width and coating, or upload a drawing.
Quote in 24h
Matched grade, guaranteed loss and B8, availability in one business day.
Free samples
Test core loss and stampability, usually within a week.
Production & QC
Rolled, slit and tested coil by coil, with a mill certificate.
Export delivery
Moisture-proof packing and ocean freight to your port.
Packaging & export
Seaworthy packing to any port
Coil packaging
Moisture-proof kraft paper and VCI wrap, banded with edge and coil-eye protection.
Sheet & strip packaging
Strapped on wooden pallets or steel racks, corner-protected for forklift handling.
Container loading
Coils secured with dunnage and lashing, by container or in bulk for break-bulk.
FAQ
Sourcing grain-oriented steel from us
What is grain-oriented electrical steel?
Grain-oriented (CRGO) silicon steel has its grain structure aligned to the rolling direction, giving very low core loss and high permeability along that axis. It is the standard core material for power and distribution transformers operating at 50/60 Hz.
What is the difference between conventional CGO and Hi-B?
Both are grain-oriented. Hi-B (high-permeability) grades have sharper grain alignment and often laser domain refinement, so at the same thickness they show ~20–30% lower loss and B8 around 1.88–1.93 T — at a higher price. CGO covers most cost-sensitive designs.
Which thickness should I choose?
Thinner gauges (0.23 mm and below) cut eddy-current loss and suit high-efficiency cores; 0.27 mm is the general default; 0.30–0.35 mm favours material economics and larger, lower-frequency cores. For 400 Hz and above, use ultra-thin 0.10–0.20 mm.
How do AISI M-3/M-4/M-5/M-6 relate to GB grades?
As a working guide: M-3 ≈ 0.23 mm, M-4 ≈ 27Q120, M-5 ≈ 30Q130, M-6 ≈ 35Q155. These are close equivalents, not identical specs; we confirm against your datasheet before quoting.
Do you supply coil, sheet, slit strip or laminations?
All four — master or mill-edge coils, cut-to-length sheet, precision slit strip to your width, and stamped or laser-cut laminations to drawing.
What surface coating and tolerances do you offer?
Standard C5 inorganic coating; C6 inorganic-organic on request for punching or stress-relief annealing. Thickness tolerance ± 0.02 mm; width tolerance ± 0.1–0.3 mm on slit strip.
Do you provide laser-scribed / domain-refined material?
Yes, on the thinner Hi-B grades where further loss reduction is needed. Laser scribing survives stress-relief annealing, so it suits laminations annealed after cutting. Specify the target P1.7/50 and we quote the matching grade.
Can you match EN, JIS or AISI grades?
Yes — cross-reference to GB, EN 10107, JIS C 2553 and AISI is provided. Send the datasheet for confirmation.
What are your minimum order and lead time?
MOQ depends on grade, thickness and width; common gauges are often available within days, non-standard widths typically need several weeks. Free samples usually ship within one week.
What standards and certifications apply?
ISO 9001 and IATF 16949 production; material to GB, EN, JIS or AISI; RoHS/REACH compliance; mill test certificate with every shipment.
Why buyers choose Zhongxin
Mill-grade grain-oriented steel, export-ready service
Need grain-oriented steel for a specific core design?
Send your thickness, grade and width — or your target core loss and induction — and our engineers will confirm the grade and send a quote within 24 hours.
Request a quote → Ask for free samples
