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ASTM A876 Grain-Oriented Silicon Steel Coil | High Magnetic Flux & Low Core Loss for Transformers
| Item | Description |
| Product Name | ASTM A876 Silicon Steel Coil |
| Steel Type | Grain-Oriented Electrical Steel (GOES) |
| Manufacturing Process | Cold-Rolled, Fully Annealed |
| Standard | ASTM A876 |
| Application Frequency | 50 / 60 Hz |
| Typical Applications | Transformer Cores, Motors, Generators, Inductors |
| Element | Typical Composition (%) | Notes |
| Carbon (C) | ≤ 0.005 | Ensures low core loss and minimizes eddy currents |
| Silicon (Si) | 2.8 – 3.5 | Improves magnetic permeability and reduces core loss |
| Manganese (Mn) | ≤ 0.30 | Enhances steel strength and ductility |
| Phosphorus (P) | ≤ 0.03 | Controls brittleness, improves magnetic properties |
| Sulfur (S) | ≤ 0.03 | Reduces impurities, prevents processing defects |
| Aluminum (Al) | 0.03 – 0.10 | Deoxidizes steel and ensures uniformity |
| Iron (Fe) | Balance (~95–97%) | Main base element |
| Category | Property | Typical / Specified Value | Notes |
| Steel Type | Chemical Composition | ~3.0–3.2 % Si, low C | Designed for low core loss and high magnetic permeability |
| Physical Dimensions | Thickness | 0.18–0.35 mm (customizable) | Commonly used for transformer core laminations |
| Width | Customizable | Slit to customer specifications | |
| Density | ~7,650 kg/m³ | Typical for 3 % silicon steel | |
| Lamination Factor / Stacking Factor | ≥0.96 | Indicates compactness of stacked laminations | |
| Surface Coating | C‑5 or similar insulating coating | Reduces interlaminar eddy current losses | |
| Magnetic Properties | Core Loss (P) | 0.8–1.2 W/kg (50 Hz, 1.7 T) | Tested per ASTM A343; varies by grade |
| Magnetic Induction (B8 / J800) | ≥1.80–1.88 T | Higher-induction grades can achieve higher values | |
| Relative Permeability (μᵣ) | 1,000–1,800+ | High along rolling direction; higher for Hi‑B grades | |
| Magnetic Aging / Stability | Within standard limits | Ensures long-term stable performance | |
| Mechanical Properties | Ductility / Workability | Meets standard requirements | Suitable for punching, bending, and stacking |
| Test Standards | ASTM A343 / ASTM A804, etc. | Core properties tested per standard methods |
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| Application Category | Typical Applications | Notes |
| Power Transformers | Core laminations of distribution and power transformers | Designed for low iron loss and high permeability to minimize energy loss. |
| Instrument Transformers | Current transformers (CT), voltage transformers (VT) | High magnetic precision enables accurate measurement and metering. |
| Large Electric Motors | Rotor and stator laminations of AC motors | Enhanced torque performance reduces magnetic loss and improves efficiency. |
| Generators | Stator and rotor cores of generators | Ensuring high magnetic flux density in the rolling direction results in high efficiency. |
| Magnetic Amplifiers & Inductors | Electromagnetic devices or high-frequency magnetic devices | Utilizing low-loss and high permeability grades, precise magnetic control is achieved even in the presence of interfering magnetic fields. |
| Renewable Energy Equipment | Wind turbines, hydroelectric generators | Improving energy conversion efficiency in sustainable energy power systems. |
| Specialty Electrical Devices | Chokes, reactors, and magnetic sensors | Achieving precise magnetic performance in a small, compact structure. |
1) Branch Office - Spanish-speaking support, customs clearance assistance, etc.
2) Over 5,000 tons of stock in stock, with a wide variety of sizes
3) Inspected by authoritative organizations such as CCIC, SGS, BV, and TUV, with standard seaworthy packaging
Packaging Characteristics
Roll Protection: The inner core of the roll material is made of steel or paper tubing, with corner guards or angle irons added to the edges; the surface is covered with moisture-proof paper or PE film, and rust-preventive oil can be applied as needed.
Securation Method: High-strength steel strapping is used for binding; wooden pallets or trays can be used if necessary.
Bundling (Optional): Thin rolls can be bundled into multiple rolls, separated by separator paper to prevent scratches, and covered with a plastic film for protection.
Transportation Methods
Sea Freight: Use 20-foot/40-foot containers, securely secured with wooden wedges.
Rail Transport: Flatbed truck or rail transport, secured with chains or brackets.
Handling and Storage
Use coil hooks, lifting devices, or C-frames to prevent dragging.
Roll materials should be stored upright to prevent deformation and rust.
Store in a dry, well-ventilated place, and do not place them too high.
Stable cooperation with shipping companies such as MSK, MSC, COSCO efficiently logistics service chain, logistics service chain are we to your satisfaction.
We follow the standards of quality management system ISO9001 in all procedure, and have strict control from packaging material purchase to transport vehicle scheduling.
1. What is it and why use it?
Grain-oriented silicon steel is a low-carbon, high-silicon electrical steel with grains aligned along the rolling direction. This ensures high magnetic permeability and low core loss, making it ideal for transformers and energy-efficient electrical devices.
2. Typical applications:
Used in power and instrument transformers, large motors, generators, reactors, and renewable energy equipment where high magnetic efficiency is required.
3. Key properties:
Thickness: 0.18–0.35 mm (customizable)
Core loss: ~0.8–1.2 W/kg @ 50 Hz, 1.7 T
Magnetic induction (B8): ≥1.80–1.88 T
Relative permeability: 1,000–1,800+
Lamination factor: ≥0.96
4. Differences from non-oriented silicon steel:
Grain-oriented steel is directional, optimized for the rolling direction (best for transformer cores), while non-oriented steel is isotropic, suitable for rotating machines like motors.
5. Handling and storage tips:
Avoid bending or stacking that damages grain orientation.
Store in dry, non-corrosive environments.
Insulating coatings (e.g., C-5) reduce eddy current loss and protect laminations.
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