Applications · Distribution Transformers
CRGO Steel for Distribution TransformersBalanced core loss & cost for pole-mounted, pad-mounted & dry-type units
Grain-oriented silicon steel for distribution transformer cores, 0.27–0.30 mm in standard M4–M6 grades, with Hi-B options for premium-efficiency lines. Sized for high-volume production across pole-mounted, pad-mounted and dry-type units, with core loss suited to US DOE 10 CFR 431 and EU Ecodesign efficiency tiers.
Product photos
CRGO built for high-volume distribution cores
Coil, cut sheet and stamped laminations sized for the volumes distribution transformer lines run at.
Master coil · M4–M6
CRGO Master Coil
Standard grain-oriented coil for high-volume distribution production runs.
- Thickness0.27–0.30 mm
- Core loss P1.7/50≤ 1.10 W/kg
Cut-to-length sheet
Cut-to-Length Sheet
Sized to your stamping die, for the shell- and core-type laminations small distribution units are built from.
- Thickness0.27–0.30 mm
- FormatTo die drawing
Stamped & stacked core
Stamped & Stacked Core
Laminations punched and stacked into a small distribution core — consistent stamping quality keeps scrap and rework low at volume.
- Stacking factorHigh, low burr
- Batch consistencyCoil-to-coil
Why it matters
Small loss differences, multiplied across a whole fleet
A single distribution transformer is small next to a power transformer, but utilities and OEMs buy them by the thousand — so a core-loss difference of a few hundredths of a watt per kilogram compounds into a real fleet-wide energy cost. Unlike a GSU or large power unit where no-load loss dominates, distribution transformers cycle with daily demand, so both no-load loss (constant, 24/7) and load loss (varies with draw) matter to the total-owning-cost evaluation utilities run when awarding volume contracts.
Efficiency regulation drives the spec directly: US DOE 10 CFR 431 sets minimum efficiency levels for liquid-immersed and dry-type distribution transformers sold in the US, and the EU Ecodesign Regulation (EU) 548/2014 sets Tier 1/Tier 2 core-loss ceilings for the European market. Both push standard CRGO cores toward tighter loss control, and push premium lines toward Hi-B grades or thinner gauges to clear the higher tier with margin.
Types we supply for
Across the distribution transformer family
Core spec shifts with mounting type and duty — tell us which you’re building and we’ll recommend a grade.
01
Pole-mounted
Single-phase units, typically 15–167 kVA, for residential and rural overhead feeders.
02
Pad-mounted
Three-phase units in a compact tamper-resistant enclosure, for commercial and underground residential feeds.
03
Dry-type / cast-resin
Oil-free indoor units for buildings, mines and sites where fire safety rules out liquid-filled transformers.
04
Underground vault
Network and urban underground distribution, higher duty cycle than typical pad-mounted units.
Application photos
Where this steel ends up
Distribution transformers built with our CRGO cores, from the stamping line to the utility pole.
Pole-mounted, single-phase
Pole-Mounted Unit
The most common distribution transformer in the field — small, single-phase, and produced by the thousand, which is exactly why per-unit core loss matters.
Pad-mounted, three-phase
Pad-Mounted Unit
Compact enclosed units for commercial sites and underground residential feeds, where enclosure size limits core footprint.
Stamping & stacking line
Stamping & Stacking Line
High-throughput lamination stamping and core building — where coil-to-coil consistency in our steel keeps line speed up and scrap down.
Side by side
Standard CRGO vs Hi-B for distribution cores
Standard CRGO covers most distribution fleets; Hi-B is a premium option for the highest efficiency tiers or loss-weighted utility tenders.
| Property | Standard CRGO (M4–M6) | Hi-B (27Q120 / 23ZH90) |
|---|---|---|
| Thickness | 0.27–0.30 mm | 0.23–0.27 mm |
| Core loss P1.7/50 | ≤ 1.10–1.30 W/kg | ≤ 0.85–0.95 W/kg |
| Magnetic induction B8 | ≥ 1.85 T | ≥ 1.88–1.90 T |
| Typical use | General distribution fleet, DOE/Ecodesign baseline tiers | Premium-efficiency lines, higher loss-evaluation tenders |
| Best for | Cost-balanced volume production | Utilities weighting core loss heavily in bid evaluation |
Need the large power-transformer range instead? See CRGO for power transformers → or browse the full CRGO range →
Recommended grades
Grades we ship for distribution cores
Standard M4–M6 covers the great majority of pole- and pad-mounted production; step up to Hi-B where your efficiency tier or contract loss-evaluation calls for it.
Equivalents, at a glance
How we work
From core spec to your dock
A simple path from spec to delivery, built for high-volume distribution transformer production.
Send core spec
kVA rating, grade, thickness, or a stamping-die drawing.
Quote in 24h
Standard or Hi-B pricing and availability within one business day.
Free samples
Test core loss and stampability, usually within a week.
Production & QC
Rolled, slit or cut-to-length, tested to grade with a mill certificate.
Export delivery
Moisture-proof coil or sheet packing and ocean freight to your port.
FAQ
Sourcing CRGO for distribution transformers
Which CRGO grade is right for distribution transformers?
Standard M4–M6 (27Q120–30Q140) covers most pole- and pad-mounted production. If your efficiency tier or a loss-weighted utility contract calls for a lower core loss, step up to Hi-B grades like 23ZH90.
Do you supply for pole-mounted, pad-mounted and dry-type units?
Yes — the same CRGO grades cover all three; the difference is mainly in form (coil, cut sheet or stamped lamination) and thickness rather than the steel family itself.
Can your steel meet DOE 10 CFR 431 or EU Ecodesign efficiency requirements?
Our standard and Hi-B core loss figures are built to support both US DOE 10 CFR 431 and EU Ecodesign (548/2014) tiers — send your target efficiency level and we’ll confirm the grade that clears it with margin.
What’s the difference between standard and Hi-B for distribution transformers?
Hi-B has stronger grain alignment and a thinner typical gauge, lowering core loss P1.7/50 from around 1.10–1.30 W/kg to 0.85–0.95 W/kg. It costs more per ton but can be the difference between clearing a higher efficiency tier or not.
Do you supply cut-to-length sheet for stamped laminations?
Yes — cut-to-length sheet sized to your stamping die is a standard form for distribution-scale laminations, alongside coil and slit strip.
What’s the minimum order quantity for distribution transformer grades?
MOQ depends on grade, thickness and width. High-volume standard grades generally have lower thresholds than Hi-B or non-standard widths — tell us your target volume and we’ll confirm what’s workable.
Can you match a specific kVA or core-loss target?
Yes — send your kVA rating and target core loss and we’ll recommend the grade and thickness combination that fits, or confirm equivalence to a spec you’re already using.
How fast can you quote and ship for high-volume orders?
Quotes come within 24 hours. Standard M4–M6 grades often ship from stock in days for reorders; new specs or Hi-B runs typically take a few weeks.
Do you provide mill test certificates?
Yes — a mill test certificate covering core loss and induction values ships with every order, under ISO 9001 and IATF 16949.
How do you handle export packaging for coil and sheet orders?
Seaworthy, moisture-proof packaging on coils, sheet pallets or bundles, shipped to any port. We’ll align on payment terms at the order stage.
Why buyers choose Zhongxin
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, serving transformer and motor makers across Europe, the Americas, Asia and beyond.
Send your core spec — get a quote in 24 hours
Share grade, thickness, kVA rating or a drawing. Free samples available.