SMSTEEL
SMSTEEL
Explore our premium selection of silicon steel plates, coils, and structural steel components engineered for maximum efficiency and magnetic performance.
A comprehensive technical whitepaper on metallurgy, magnetic performance, and global supply chain strategies for high-efficiency electrical steel cores.
Silicon steel, also known as electrical steel or lamination steel, is a specialized soft magnetic alloy engineered to optimize electromagnetic conversion efficiency. By incorporating controlled amounts of silicon (typically ranging from 1.5% to 4.5%), the material significantly increases its electrical resistivity. This metallurgical modification suppresses eddy current losses, which are a major source of energy dissipation in alternating current (AC) magnetic circuits.
The manufacturing process requires extreme precision. At STEP MILLION STEEL, we utilize advanced vacuum decarburization and controlled annealing processes to ensure ultra-low carbon levels (under 0.005%). This prevents magnetic aging and guarantees long-term operational stability. The addition of silicon also reduces magnetostriction, minimizing the physical vibration and audible hum commonly associated with high-power transformers.
Cold-Rolled Grain-Oriented steel features a highly uniform crystal orientation (Goss texture). This structure offers exceptional magnetic permeability and extremely low core loss in the rolling direction, making it the premier choice for high-efficiency power and distribution transformers.
Cold-Rolled Non-Grain-Oriented steel exhibits isotropic magnetic properties, meaning its magnetic behavior is uniform in all directions. This characteristic is critical for rotating machinery, such as electric vehicle (EV) traction motors, industrial generators, and household appliance motors.
To further minimize inter-lamination eddy currents, our silicon steel plates are treated with high-performance inorganic and organic coatings (C-3, C-5, and C-6). These coatings provide superior insulation, excellent punchability, and high heat resistance during stress-relief annealing.
A detailed breakdown of typical grades, thicknesses, and magnetic properties of our wholesale silicon steel offerings.
| Steel Type | Common Grades (IEC/ASTM) | Nominal Thickness (mm) | Max Core Loss at 1.5T / 50Hz (W/kg) | Min Magnetic Induction at 800 A/m (T) | Primary Applications |
|---|---|---|---|---|---|
| CRGO (Grain-Oriented) | 23Q110, 27Q120, 30Q130 | 0.23 - 0.30 | 0.85 - 1.10 | 1.80 - 1.85 | Power Transformers, Distribution Cores, Reactors |
| High-Permeability CRGO | 23HIB110, 27HIB120 | 0.23 - 0.27 | 0.75 - 0.95 | 1.88 - 1.92 | Ultra-High Voltage (UHV) Grids, Premium Transformers |
| CRNGO (Non-Oriented) | 35W250, 50W470, 65W800 | 0.35 - 0.65 | 2.50 - 4.70 | 1.60 - 1.65 | EV Traction Motors, Alternators, Compressor Motors |
| Thin-Gauge CRNGO | 20WT1200, 15WT1000 | 0.15 - 0.20 | 1.20 - 1.50 (at 400Hz) | 1.55 - 1.60 | High-Frequency EV Motors, Aerospace Generators |
Founded in 2010, STEP MILLION STEEL SUPPLY CHINA CO., LTD. has grown into a premier global supplier of high-grade electrical steel and structural metal products.
Our state-of-the-art production facilities span over 66,700 square meters, housing more than 300 highly skilled employees. With eight advanced High-Frequency welded lines and specialized cold-rolling and slitting mills, we achieve a massive monthly output of 100,000 tons, with over 50% dedicated to international export markets.
To maintain our position at the forefront of metallurgical technology, our molding and processing workshops are staffed by 20 dedicated R&D engineers, each possessing over 10 years of specialized experience in electrical steel optimization and custom core design.
We have established deep strategic partnerships with China's leading state-owned steel conglomerates, including Baowu Iron and Steel Group, Shougang Group, Hebei Iron and Steel Group (HBIS), and Anshan Iron and Steel Group (Ansteel). These alliances guarantee our raw material supply chain, ensuring that we deliver consistent, prime-grade silicon steel to our global clientele.
How we help global OEMs, transformer manufacturers, and motor producers mitigate supply chain risks and optimize material costs.
The cost of silicon steel is highly sensitive to raw material inputs like high-purity iron ore and silicon alloys. Through our long-term strategic agreements with major steel mills, we offer stable pricing mechanisms, hedging options, and flexible contract terms to protect your margins.
Every transformer and motor core design requires precise dimensional tolerances. We provide in-house precision slitting, cut-to-length, and progressive stamping services, delivering silicon steel coils and laminations tailored to your exact engineering drawings.
Our dedicated team of over 20 quality inspectors, utilizing state-of-the-art testing equipment from Germany and Japan, conducts rigorous Epstein frame testing, single-sheet testing, and dimensional verification to ensure zero-defect shipments.
As the global energy transition accelerates, the demand for ultra-efficient electrical steel is evolving. Here is how we are leading the technological shift.
To support next-generation EV traction motors operating at high frequencies (above 10 kHz), we are scaling the production of ultra-thin CRNGO sheets. This drastically reduces high-frequency eddy current losses, extending EV range and improving motor power density.
For high-efficiency power grids, we are implementing advanced laser-scribing technology on our CRGO lines. By introducing local thermal stresses on the steel surface, we refine the magnetic domain structure, reducing core losses by an additional 10% to 15%.
Aligning with global ESG mandates, STEP MILLION STEEL is actively transitioning to hydrogen-reduced iron inputs and utilizing 100% renewable energy for our annealing furnaces, helping our customers achieve their Scope 3 emission reduction targets.
At STEP MILLION STEEL, quality is not just a department—it is our core competitive advantage. All of our raw materials and finished silicon steel plates are manufactured in strict accordance with international standards, including GB, ASTM, BS, DIN, and EN. CE and ISO certifications are readily available upon request to facilitate seamless regulatory approval in your local market.
Our state-of-the-art laboratory is equipped with precision testing instruments imported from Germany and Japan. We perform continuous testing on magnetic induction (B50), core loss (P15/50), inter-lamination resistance, coating adhesion, and dimensional flatness. This rigorous protocol ensures that every shipment meets or exceeds the strict expectations of global OEMs and power grid operators.
Our high-performance silicon steel plates and structural steel products drive critical systems across multiple global sectors.
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Get authoritative answers to technical and commercial queries regarding silicon steel plate procurement and applications.
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