Grain-Oriented Electrical Steel (GOES): What Buyers Should Know
Grain-oriented electrical steel - often abbreviated as GOES - is the material sitting at the center of nearly every power and distribution transformer built today. If you're sourcing transformer cores, specifying lamination steel, or evaluating a steel mill's quotation, understanding what separates one GOES grade from another matters more than most procurement teams realize.
What Makes GOES Different
GOES is an iron-silicon alloy with silicon content around 3% to 3.2%, processed so that its crystal grains align in the rolling direction. This alignment - known as the Goss texture - is what gives the material its defining property: high permeability and low core loss specifically along the rolling direction. That directional preference makes GOES ideal for transformer cores, where the magnetic flux path is carefully controlled.
The industry calls it the "pearl on the crown" of electrical steel. The manufacturing process is long, the technology window is tight, and the barrier to entry is high. Only a handful of producers worldwide can make high-permeability grades consistently.
The Three Product Classes
GOES grades are grouped into three broad classes, defined by both Chinese national standard GB/T 2521.2-2025 and international standard IEC 60404-8-7: conventional grades, high-permeability grades, and magnetic domain refined high-permeability grades. The distinction matters for buyers because it maps directly to core loss performance and transformer efficiency compliance.
| Class | Characteristic | Typical Application |
|---|---|---|
| Conventional (CGO) | Standard core loss, lower cost | Distribution transformers, general power equipment |
| High Permeability (HiB) | Lower core loss, higher flux density | Power transformers, energy-efficient designs |
| Domain Refined | Lowest core loss, highest cost | Ultra-high-efficiency transformers, specialty applications |
HiB grades are taking over. In China, they accounted for roughly 77% of GOES output in the first half of 2026, up from 67% a year earlier. Tighter transformer efficiency standards are driving the shift, and the economics of no-load loss over a transformer's operating life make the higher grade easier to justify.
Thickness and Grade: What the Numbers Mean
GOES is supplied in nominal thicknesses of 0.18 mm, 0.20 mm, 0.23 mm, 0.27 mm, 0.30 mm, and 0.35 mm. The 0.23 mm segment holds the largest market share, accounting for over half of demand in 2026. Thinner gauges reduce eddy current losses but cost more to produce and handle. Buyers typically choose based on the transformer's efficiency target and the cost premium they're willing to absorb.
A typical grade designation like B23R095 tells you three things at a glance: nominal thickness 0.23 mm, a guaranteed maximum core loss of 0.95 W/kg at 1.7 T and 50 Hz. That's roughly 13.6% lower loss than the older 23Q110 grade - enough to make a difference in whether a transformer clears a given efficiency tier.
| Grade Example | Thickness | Max Core Loss (W/kg) | Min Flux Density (T) |
|---|---|---|---|
| 23Q110 (older) | 0.23 mm | 1.10 | ~1.80 |
| 23Q095 / B23R095 | 0.23 mm | 0.95 | ≥1.87 |
| 0.18 mm HiB | 0.18 mm | Lower than 0.23 mm | ≥1.87 |
A core running at 0.95 W/kg instead of 1.10 W/kg generates less heat and needs less cooling. Over decades of service, the electricity savings add up. That's the total owning cost calculation buyers should be running.
Figure 1. Core loss comparison between standard-grade 23Q110 and high-flux-grade B23R095 GOES at 0.23 mm nominal thickness. Values per GB/T 2521.2-2025.
Market Structure and Supply
The GOES market reached approximately $7.4 billion in 2025 and is projected to grow to $7.6 billion in 2026, with a steady long-term growth trajectory. Asia-Pacific dominates production and consumption at roughly 65-70% share, with China as the single largest market.
The supplier base is concentrated. Baowu Group, Nippon Steel, NLMK, Shougang, and AK Steel (Cleveland-Cliffs) are the top five producers, collectively holding about 58% of the global market. For buyers, this concentration means supply security and pricing leverage depend heavily on which grades and regions you're sourcing from.
On the demand side, transformers account for roughly 91-97% of GOES consumption. The application is nearly monolithic, which means GOES demand tracks transformer production almost one-to-one.
Pricing Reality in 2026
GOES pricing has been volatile. Chinese prices moved from roughly $1.30/kg in early 2025 to $1.44/kg by mid-2026, while US prices reached $1.99/kg and Germany $2.09/kg on a delivered basis. The spread reflects freight, import dependence, and regional supply dynamics.
In September 2026, warehouse prices for grade 130 (0.3 mm) in China jumped 16.27% in a single month, from $1,512/MT to $1,758/MT. That kind of move gets attention in procurement departments.
The average price hides a split market. Regular grades face ample supply and weak demand. High-permeability grades - particularly for UHV and ultra-efficient transformers - remain tight, constrained by technical barriers and concentrated capacity. Buyers sourcing standard grades have more negotiating room. Buyers needing top-tier HiB grades are competing for limited supply.
What to Watch When Specifying
If you're specifying GOES for a transformer project, a few practical points matter.
Pick the grade based on the efficiency target, not the other way around. The GB/T 2521.2-2025 revision expanded the grade range significantly, adding 8 high-permeability grades, 12 non-heat-resistant domain-refined grades, and 6 heat-resistant domain-refined grades. More options means more room to over- or under-specify.
Thickness trades off with cost. Moving from 0.23 mm to 0.20 mm or 0.18 mm reduces eddy current loss, but the price premium can be significant. The decision should be driven by whether the transformer needs to meet a specific loss tier.
Coating matters. Surface insulation resistance requirements were tightened in the new standard, and the coating type affects both stamping performance and stress-relief annealing compatibility.
Lead times for high grades are longer. HiB grades are not a commodity. Capacity is concentrated, and the qualification process for a new supplier takes time. If your project timeline is tight, lock in grade availability early.
What to Watch When Specifying
If you're specifying GOES for a transformer project, a few practical points matter.
Pick the grade based on the efficiency target, not the other way around. The GB/T 2521.2-2025 revision expanded the grade range significantly, adding 8 high-permeability grades, 12 non-heat-resistant domain-refined grades, and 6 heat-resistant domain-refined grades. More options means more room to over- or under-specify.
Thickness trades off with cost. Moving from 0.23 mm to 0.20 mm or 0.18 mm reduces eddy current loss, but the price premium can be significant. The decision should be driven by whether the transformer needs to meet a specific loss tier.
Coating matters. Surface insulation resistance requirements were tightened in the new standard, and the coating type affects both stamping performance and stress-relief annealing compatibility.
Lead times for high grades are longer. HiB grades are not a commodity. Capacity is concentrated, and the qualification process for a new supplier takes time. If your project timeline is tight, lock in grade availability early.
TIG - Trust in Grid
We manufacture transformers and supply core materials, including GOES cores for power and distribution transformer applications.
If you're working on a transformer project and need to evaluate grade selection, thickness, or supplier options, send us your specs - efficiency target, transformer type, volume, and timeline. We'll give you a straight answer.
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