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Help CenterGB/T 2521 ASTM A876 Grain Oriented Silicon Steel Coil 600-1250mm Wide Slittable Strip For Power Transformer Core
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As a manufacturer with over 7 years of specialized experience, Wuxi Yansheng Technology Co., Ltd. proudly presents our premium Grain Oriented Silicon Steel Coil in accordance with GB/T 2521 and ASTM A876 standards. Our factory, spanning 1,000–3,000 square meters and staffed by 101–200 skilled professionals, produces coils that are widely used in power transformer cores due to their excellent magnetic properties and low core loss. With an annual export value exceeding US$50 million and shipments through major Chinese ports (Tianjin, Shanghai, Qingdao, Ningbo), we ensure timely delivery to clients across North America, Europe, Southeast Asia, and more.
This product features a grain-oriented microstructure that aligns the crystal grains to the rolling direction, resulting in superior magnetic flux density and significantly reduced energy losses. The coil width ranges from 600 mm to 1250 mm, making it ideal for slitting into narrower strips required for transformer core laminations. Our coils are supplied with a C-5 insulation coating that provides high interlamination resistance and excellent punchability.
Key Features and Benefits:
High Magnetic Permeability: Ensures efficient energy transfer, reducing transformer size and weight.
Ultra-Low Core Loss: Complies with P1.7/50 values as low as 1.05 W/kg (for 0.23mm grade), meeting stringent energy-efficiency requirements.
Excellent Lamination Factor: Tight thickness tolerance (±0.01mm) and flat surface for high stacking density.
Slittable Design: Custom slit widths from 20 mm to 1250 mm available upon request; our precision slitting ensures burr-free edges.
Insulation Coating: Uniform C-5 coating withstands high annealing temperatures and provides reliable electrical insulation between laminations.
Consistent Quality: Manufactured under strict ISO 9001, ISO 14000, and OHSAS 18001 certified systems, with 100% on-line inspection for magnetic properties and surface defects.
Typical Technical Specifications:
Our grain-oriented silicon steel coils are essential for manufacturing power transformers ranging from distribution transformers to large grid transformers. The slittable strip format allows transformer manufacturers to produce cores with precise dimensions, minimizing scrap and reducing assembly time. The high magnetic permeability also enables transformer designs with lower excitation currents and quieter operation.
With a total workforce of 101–200, our company operates modern slitting lines, annealing furnaces, and testing equipment. We have passed multiple quality management certifications including ISO 9001, ISO 14000, OHSAS 18001, SA8000, TL9000, QS9000, and HACCP (for relevant food-grade packaging). Our main markets span North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, and the Middle East, reflecting our global reputation for reliability.
Why Choose Wuxi Yansheng Technology?
Established in 2017, yet already exporting US$50–100 million annually — proof of our rapid growth and customer trust.
Factory located in Wuxi, Jiangsu, close to Shanghai and Ningbo ports for flexible and fast shipment.
We offer free samples for quality evaluation (shipping cost negotiable).
Experienced technical team provides application support and custom specifications.
Contact us today to discuss your transformer core requirements. Whether you need standard widths, special slit dimensions, or custom coating thicknesses, we are ready to deliver a product that meets your exact performance and budget needs.
Frequently Asked Questions (FAQ)
Q: What is the minimum order quantity (MOQ)?
A: Our MOQ for standard grain-oriented silicon steel coils is 1 ton. For customized slit strips, the MOQ may vary based on width; please contact us for details.Q: How long does delivery take?
A: Typical lead time is 15–25 working days after order confirmation, depending on the quantity and slitting requirements. Urgent orders can be arranged upon request.Q: What certifications do your products have?
A: Our manufacturing facilities are certified under ISO 9001, ISO 14000, OHSAS 18001, SA8000, TL9000, QS9000, and HACCP. The coils themselves are tested according to GB/T 2521 and ASTM A876 standards, and we provide Mill Test Certificates with every shipment.Q: Can you slit the coil into exact widths for transformer laminations?
A: Yes, we offer precision slitting services with burr-free edges. Minimum slit width is 20 mm, and tolerance is ±0.1 mm. Please provide your required strip width and tolerances when ordering.Q: What surface coating is applied?
A: Standard coating is C-5 (aluminum phosphate-based) that provides excellent interlamination resistance and withstands stress-relief annealing temperatures up to 800°C. Other coating types (e.g., C-3, C-6) are available on request.Q: Do you offer samples for testing?
A: Yes, we provide free samples of 100 mm x 100 mm stamped laminations or 1-meter long slit strip samples. The buyer pays only the shipping cost. Contact our sales team to arrange sampling.Q: What is the difference between grain-oriented and non-oriented silicon steel?
A: Grain-oriented steel has a preferred crystal orientation that provides high magnetic permeability in the rolling direction, making it ideal for transformer cores where flux is controlled. Non-oriented steel has isotropic magnetic properties and is used in rotating machines like motors and generators.Q: How are the coils packed for export?
A: All coils are packed with anti-rust paper, plastic wrapping, and steel strapping on wooden pallets or eye-to-eye horizontal packing for container shipment. Custom packaging is available upon request.
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