CRGO (Cold Rolled Grain Oriented) electrical steel — the CGO and HiB grades dedicated to wound transformer cores — traded in a band of roughly 1,800 to 2,200 USD/t for mainstream M2-M4 (0.23-0.30 mm) products on the Chinese spot channel as of 1 July 2026 [S1].
CRNGO (Cold Rolled Non-Grain Oriented) electrical steel, used for motor and generator laminations, sits in a lower band of roughly 1,100 to 1,500 USD/t for 50W470-50W1300 (0.50 mm) coil [S2][S3]. The two product families share a common silicon-alloying backbone but are processed and sold through separate channels; confusing them is the single most expensive specification error in transformer sourcing.
CRGO vs CRNGO: which grade family you actually need
CRGO is specified for transformer cores wound in the rolling direction; the magnetic domain alignment that gives it superior loss-per-cycle at 50/60 Hz flux densities of 1.5-1.7 T is the same reason it performs poorly in rotating machines, where flux rotates through the lamination plane [S1][S2].
CRNGO has near-isotropic magnetic properties in the lamination plane, so it is the correct choice for EV traction motors, industrial induction motors and stator/rotor stacks where the flux vector sweeps through 360° [S2]. The two are not interchangeable: substituting CRNGO into a CRGO core spec typically inflates no-load loss by 30-50%; substituting CRGO into a rotating lamination produces heavy localised saturation and acoustic noise [S1].
Grade selection inside each family is driven by core loss per kilogram at 50/60 Hz and 1.5/1.7 T (W/kg), not by tensile strength — this is the dominant mistake when engineers borrow a structural alloy steel selection mindset. For wound-core power transformers, M2-M4 (0.23-0.30 mm) is mainstream; M5-M6 (0.30-0.35 mm) is the price-driven volume grade. For motor laminations, 50W470 to 50W600 is the most common EV/industrial motor range, with 50W1300 reserved for low-cost appliance and small-motor use [S2][S3].
Mid-2026 price bands and what is moving the spread
CRGO M2-M4 (0.23-0.27 mm, HiB) spot was around 1,900-2,200 USD/t on the Chinese export channel in late June 2026, with mill-to-mill variation of 200-300 USD/t driven by core-loss guarantees and order size [S1].
CRNGO 50W470-50W600 (0.50 mm) was reported in the 1,200-1,500 USD/t band, with heavier 50W800-50W1300 grades lower at roughly 1,100-1,300 USD/t [S2][S3]. The CRGO/CRNGO premium of roughly 50-80% over CRNGO reflects the HiB (high-permeability, domain-refined) processing chain: two cold-rolling stages, two annealing cycles, and a stress-coating line that CRNGO does not require [S1].
Three levers explain the band width: gauge (moving from 0.30 mm to 0.23 mm typically adds 200-400 USD/t), coating class (the standard C5 insulation coating is included; forsterite-base C6 plus tensile-anchor glass-film coatings command a 100-200 USD/t premium), and origin (Chinese mill coil typically runs 15-25% under Japanese/Korean equivalent CRGO on a like-for-like M-grade basis) [S1][S2]. For a comparable pricing reference on non-magnetic flat-rolled products, see the Copper material selection guide, which uses the same CFR/ex-works pricing structure.
Unit-cost math: per kilogram, per kVA, per kilogram of motor
For a 1,000 kVA oil-immersed distribution transformer, the CRGO core steel mass is typically 1,100-1,500 kg; at 1,950 USD/t, the steel alone is in the 2,150-2,900 USD range, or roughly 12-18% of the finished transformer cost before copper, oil and labour [S1][S2].
The mechanical stack tooling (dies, welding, stacking) typically exceeds the raw steel cost in high-volume motor production — a balance worth weighing against the die casting die cost bands when modelling new lamination tooling.
A standard silicon steel coil at 0.50 mm CRNGO has a nominal density of 7.65 g/cm³, ~2-3% under plain carbon steel, and a silicon content of 1.5-3.5% Si with aluminium added as a deoxidiser; this is the chemistry behind the electrical resistivity that suppresses eddy-current loss at 50/60 Hz [S2].
What drives the bid: silicon, energy, and the mill order book
Chinese FeSi 75% is the dominant silicon source for electrical steel; mill-published spot has moved within a roughly 1,400-1,800 USD/t band over the past 12 months, and silicon-steel coil typically re-prices with a 2-4 month lag [S3]. For a parallel read on upstream alloy volatility, the cobalt market 2026 data-gap note shows a similar pattern of mill-level disclosure gaps that can be cross-checked against shipping manifests.
Mill-level transaction dynamics — minimum order quantities of 5-20 t for CRNGO cut-to-length and 20-50 t for CRGO mill coil — set the practical entry barrier; below MOQ, service centres add 8-15% and lead times stretch to 6-10 weeks [S1][S2].
Coating, gauge, and tolerance: where the real money leaks
Insulation coating is the most under-specified line on a CRNGO/CRGO PO; C5 (organic, ~5 µm, one side) is standard and adequate for most motor and small transformer builds, while C6 (inorganic + organic duplex) and C6+ glass-film add punchability and corrosion resistance for stacked-core transformers that see oil immersion [S1][S2].
Gauge tolerance is the second leak: a CRGO coil at 0.30 mm nominal with ±0.03 mm tolerance has a 10% gauge scatter that, in wound cores, drives stacking-factor variation and hot-spot risk; HiB M2-M3 at 0.23 ±0.02 mm is a real cost-vs-uniformity trade [S1]. The lamination stamping process, even for high-end silicon steel grades, typically achieves a stacking factor of 95-97% on motor stacks; this number, not the unit price, is often the dominant material-utilisation lever [S2].
Surface finish and flatness (bow ≤ 1.0 mm/m for CRNGO, ≤ 0.5 mm/m for CRGO) determine whether a coil can be fed directly into a high-speed press; out-of-spec flatness typically forces a re-skin pass or service-centre slitting that adds 50-100 USD/t [S1][S2].
Standards and certification: what to demand on the mill test certificate
The minimum mill-test-certificate envelope for a CRGO M2-M4 coil should include: grade designation per IEC 60404-8-7, core loss in W/kg at 1.5 T and 1.7 T / 50 Hz (or 1.5 T / 60 Hz for North American), magnetic polarisation J at 800 A/m and 2,500 A/m, gauge and gauge tolerance, coating class and coating mass per side, density, and lot-level traceability [S1].
For CRNGO, the equivalent reference is IEC 60404-8-4, with grade codes 50W470 to 50W1300 carrying core-loss values at 1.0 T / 50 Hz and 1.5 T / 50 Hz [S2]. ASTM A677 (CRNGO) and ASTM A876 (CRGO) cover the U.S. buyer path; JIS C2553/2552 cover the Japanese/Korean mill path; EN 10106/10107 cover the European path [S1][S2].
Two procurement rules hold across all four standards: insist on lot-traceable heat numbers with Si and Al assays, and require a third-party SGS or equivalent pre-shipment inspection for the first three lots of any new supplier; the cost (~0.3-0.5% of order value) is small against the cost of a 50 t coil delivered to the wrong M-grade [S1][S2].
Who CRGO/CRNGO is for — and who should not be buying direct
Direct mill sourcing makes sense for transformer OEMs running 500+ t/yr of CRGO and motor manufacturers pulling 1,000+ t/yr of CRNGO; below these volumes, a service centre or stockist typically delivers 5-10% net savings once financing, scrap handling and MOQ penalties are counted [S1][S2].
Single-coil or prototype buyers (research labs, custom transformer shops under 100 t/yr) should route through a CRGO/CRNGO service centre for slitting, cut-to-length and small-pack delivery; the 15-25% service-centre premium is almost always cheaper than the carrying cost of 20 t of mill coil sitting on a balance sheet [S2][S3]. A 0.50 mm CRNGO 50W600 coil priced at 1,300 USD/t at mill becomes roughly 1,450-1,500 USD/t delivered via service centre in 1-2 t slit coils, with 4-6 week lead time versus 8-12 weeks for full mill MOQ [S2].
For a parallel read on flat-rolled non-magnetic pricing, the 2026 copper material price and cost guide uses the same mill-vs-service-centre split and is the closest analogue for unit-cost modelling.
See also the alloy steel selection criteria guide for the non-electrical steel counterpart.
For component-level specifications, see linear guide.