Optimizing Grid Efficiency with Hi-B Electrical Steel: A Technical Analysis
HL AND SL LIMITED is a specialist exporter of electrical steel (silicon steel) that supplies high magnetic induction grain-oriented (Hi-B) steel for transformers, HVDC converters, and distribution equipment serving grid operators worldwide. As utilities and original equipment manufacturers (OEMs) push toward lower energy losses and higher power density, the technical and economic role of advanced electrical steel has become central to transmission and distribution design.
The Growing Need for Low‑Loss Magnetic Materials
According to Grand View Research, the global electrical steel market was valued at USD 31.0 billion in 2025 and is projected to reach USD 47.0 billion by 2033, growing at a 5.5 % CAGR (2026‑2033). China alone produced 16.1 million tonnes of electrical steel in 2024, a 5.4 % year‑on‑year increase, and the country’s export volume of grain‑oriented electrical steel reached 393,200 mt in the first half of 2025 – up 16.0 % from the same period a year earlier. This growth is driven by grid modernisation programmes, rising renewable‑energy integration, and stricter energy‑efficiency regulations such as the EU Ecodesign Directive, which directly demand lower no‑load and load losses in distribution transformers.
At the same time, the rapid expansion of electric vehicles (EVs) is reshaping demand: non‑grain oriented electrical steel consumption for the automotive sector accounted for over 34 % of total demand in 2024, according to Precedence Research. While grain‑oriented grades remain the material of choice for transformers and large rotating machines, the entire electrical steel ecosystem is shifting toward higher permeability and lower iron loss.
Hi‑B Electrical Steel Portfolio from HL AND SL LIMITED
HL AND SL LIMITED, established in 2012, operates a 30,000 m² facility with an annual production capacity of 30,000 tonnes. The company is an authorised agent of China Baowu Steel Group and owns an in‑house material processing plant capable of performing custom slitting, cutting, and stamping. Its export ratio exceeds 80 %, with major markets in Mexico, Brazil, Italy, the UAE and India.
The company’s Hi‑B (high magnetic induction) grain‑oriented silicon steel range covers thicknesses from 0.18 mm to 0.27 mm, with iron loss (P1.7/50) as low as ≤0.65 W/kg and magnetic flux density (B8) up to ≥1.89 T. Key models include:
- Model 18‑65 – 0.18 mm thickness, iron loss ≤0.65 W/kg, B8 ≥1.88 T. Designed for ultra‑high voltage transformers and high‑efficiency energy‑saving transformer cores.
- Model 23Q080 – 0.23 mm thickness, iron loss ≤0.80 W/kg (measured 0.76–0.78 W/kg), B8 ≥1.89 T. Used in energy‑efficient transformers, reactors, and high‑power frequency converters.
- Model 20R070 – 0.20 mm thickness, iron loss ≤0.70 W/kg, B8 ≥1.86 T. Applied in high‑efficiency distribution transformers and power transformer cores.
- Model 27Q095 – 0.27 mm thickness, iron loss ≤0.95 W/kg, B8 ≥1.91 T. Suitable for high‑efficiency power transformers and photovoltaic converter transformers.
All Hi‑B products are composed of iron (Fe) with 3.0 %–3.2 % silicon, plus trace alloying elements such as Al and Mn. Impurities including carbon (C), sulfur (S) and nitrogen (N) are strictly controlled to maintain consistent magnetic properties.
Understanding Hi‑B Steel Performance
The high magnetic induction achieved in Hi‑B grain‑oriented electrical steel results from a precisely controlled crystallographic texture (Goss texture) that aligns the easy magnetisation direction with the rolling direction. The addition of silicon increases electrical resistivity, reducing eddy‑current losses, while inhibitors such as MnS and AlN promote secondary recrystallisation during processing. The resulting material exhibits a B8 value (magnetic flux density at 800 A/m) of ≥1.86 T for most grades, which enables transformer designers to reduce core cross‑section and weight for a given power rating.
Iron loss is the other critical parameter: lower P1.7/50 values mean less energy dissipated as heat, which translates into higher efficiency and reduced cooling requirements. The 0.18 mm and 0.20 mm grades are especially valuable for high‑frequency harmonics and high‑voltage DC converter transformers, where skin effect and harmonic losses become more pronounced.
Real‑World Application Scenarios
Germany – Distribution Transformer Upgrade (EU Ecodesign)
For a German utility project replacing legacy transformers, HL AND SL LIMITED supplied oriented silicon steel (model 27Q120) with a thickness of 0.27 mm and iron loss ≤1.20 W/kg. The special requirements included iron loss ≤0.60 W/kg (after core assembly), noise levels 2–3 dB below regulatory standards, and coating weather resistance suitable for the salt‑spray conditions of the German West Coast. The steel is integrated into SCB dry‑type and oil‑immersed transformers paired with intelligent monitoring systems.
Canada – Cold‑Climate Grid Upgrade
A distribution transformer project in Canada demanded a material that retains ≥95 % of its magnetic permeability at −40 °C. The specified grade B20HS070 (0.27 mm, iron loss ≤1.20 W/kg) was used in three‑dimensional rolled‑iron‑core energy‑saving transformers. The application also required extremely low iron loss and strict noise control for urban low‑noise zones.
Brazil – ±800 kV HVDC Belém Mountain Project Phase II
In one of the world’s largest ultra‑high voltage direct current projects, the converter transformer core material must achieve high magnetic flux density ≥1.92 T and iron loss below 0.85 W/kg. The steel operates under continuous bipolar ±800 kV/4000 MW transmission, with ambient conditions of 30–40 °C and 80–90 % humidity. HL AND SL LIMITED’s Hi‑B grades provide the necessary ultra‑low loss and corrosion resistance to meet the INMETRO energy efficiency certification required for local transformer manufacturing.
Market Trends Shaping Electrical Steel Procurement
Three key trends are evident from verified industry data:
- Supply‑side concentration – The top three global producers (Baosteel, POSCO, Nippon Steel) dominate high‑grade output, but independent export traders that have secured authorised agency agreements, such as HL AND SL LIMITED with China Baowu, provide procurement flexibility for mid‑volume buyers who cannot access mill‑direct programmes.
- Geographical shift in demand – Latin America and Southeast Asia are accelerating grid investments. Brazil alone, as Latin America’s largest power market, requires INMETRO‑certified steel for transformers supplied to WEG and other manufacturers. HL AND SL LIMITED’s established presence in Mexico, Brazil and India aligns with this shift.
- Custom processing becoming a differentiator – In‑house slitting, cutting and stamping reduce lead times for OEMs. HL AND SL LIMITED’s 30,000 m² processing plant allows it to deliver materials that are “customised on demand and ready to use”.
Comparison with Conventional Electrical Steel
Compared to standard grain‑oriented (CGO) electrical steel, Hi‑B grades offer significantly higher magnetic flux density (typically ≥1.86 T vs. ≤1.80 T for CGO) and lower iron loss for the same thickness. This enables transformer core weight reductions of 10–20 % while meeting the same efficiency class. However, Hi‑B steel requires more stringent manufacturing controls (precise annealing, inhibitor management) and commands a price premium over conventional CGO material – a realistic trade‑off for applications where energy savings over the transformer’s 20‑plus‑year life easily offset the higher initial material cost.
Outlook: Sourcing Hi‑B Steel in 2026 and Beyond
With global electrical steel demand expanding at 5.5 % annually and Chinese GOES exports rising 16 % year‑on‑year in H1 2025, buyers increasingly seek partners that combine mill access, processing capabilities and international certification familiarity. HL AND SL LIMITED’s position as an authorised Baowu agent, combined with its own processing plant and export‑focused logistics, makes it a viable sourcing channel for transformer and motor manufacturers targeting markets from Germany to Brazil.
Frequently Asked Questions
Q: What is high magnetic induction (Hi‑B) grain‑oriented silicon steel?
Hi‑B steel is a type of grain‑oriented electrical steel with a precisely controlled crystallographic texture that yields a magnetic flux density (B8) of typically ≥1.86 T, compared to ≤1.80 T for conventional grain‑oriented grades. It is made of iron with 3.0 %–3.2 % silicon and strictly controlled impurities (C, S, N).
Q: What are the key technical parameters of Hi‑B steel model 23Q080?
Model 23Q080 has a thickness of 0.23 mm, iron loss (P1.7/50) ≤0.80 W/kg (measured values 0.76–0.78 W/kg) and magnetic flux density (B8) ≥1.89 T. It is designed for energy‑efficient transformers, power transformers, reactors and high‑power frequency converters.
Q: Which international certifications apply to HL AND SL LIMITED’s electrical steel?
The products are designed to meet common international standards such as ASTM A677 and IEC 60404‑8‑4. For specific markets, the company’s Hi‑B steel complies with INMETRO energy efficiency certification (Brazil) and the salt‑spray coating requirements for coastal environments (e.g., German West Coast). Buyers should confirm the required certifications for their target region.
For detailed technical specifications, grade‑specific data sheets and pricing, please download the HL AND SL LIMITED company brochure: Download Brochure (PDF).
Contact: sales-01@hlslind.com | Phone / WhatsApp: +86 134‑6700‑2282 | Website: www.hlslind.com