Contact Us for the Latest ASTM A677 / A677M Non-Oriented Electrical Steel Coil Specifications and Dimensions.
ASTM A677 / A677M Cold Rolled Non-Oriented Electrical Steel Coil (NOES) for High-Efficiency Motor Cores
| Item | Description |
| Product Name | ASTM A677 Silicon Steel Coil |
| Steel Type | Non-Oriented Electrical Steel (NOES) |
| Manufacturing Process | Cold-Rolled |
| Standard | ASTM A677 / A677M |
| Application Frequency | 50 / 60 Hz |
| Typical Applications | Motors, Generators, EV Drive Motors, Appliances |
| Element | Content |
| Silicon (Si) | 0.5 – 3.5 % |
| Carbon (C) | ≤ 0.005 % |
| Sulfur (S) | ≤ 0.003 % |
| Nitrogen (N) | Strictly controlled |
| Iron (Fe) | Balance |
(Exact composition may vary by grade: M150-35A5, M230-35A5, M300-50A5, etc.)
| Property | Description |
| Grain Orientation | Non-oriented (Uniform magnetic properties in all directions) |
| Core Loss | Low to ultra-low (grade dependent) |
| Magnetic Permeability | High |
| Magnetic Induction | High (Typical B50 / B25 values per grade) |
| Coating Type | C5 / Insulated coating available |
| Performance Stability | Excellent under rotating magnetic field conditions |
| Thickness (mm) | Typical Application |
| 0.35 | High-efficiency industrial motors |
| 0.5 | General industrial motors |
| 0.65 | Standard motors & generators |
| Grade | Thickness | Typical Use |
| M150-35A5 | 0.35 mm | High-efficiency IE3 / IE4 motors |
| M230-35A5 | 0.35 mm | EV motors / Industrial motors |
| M300-50A5 | 0.50 mm | Standard motors & generators |
| Property | Specification / Range | Notes / Typical Grades |
| Thickness (mm) | 0.35 / 0.50 / 0.65 | M150-35A5, M230-35A5, M300-50A5 |
| Thickness Tolerance | ±0.005 mm | ASTM A677 standard |
| Width (mm) | 800 – 1250 | Slitting width 30–1250 mm available |
| Width Tolerance | ±1.0 mm | Mill Edge / Slit Edge |
| Coil Inner Diameter (ID) | 508 mm / 610 mm | Standard for handling equipment |
| Coil Outer Diameter (OD) | ≤ 1500 mm | Depends on coil weight |
| Coil Weight | 3 – 8 Metric Tons | Customizable |
| Surface Coating | C5 / Insulated coating | Optional per request |
| Edge Condition | Mill Edge / Slit Edge | For lamination and motor cores |
| Form | Full Coil / Slit Coil / Cut-to-Length Sheet | According to customer requirements |
| Application Frequency | 50 / 60 Hz | Industrial motors, EV motors, generators, home appliances |
| Performance | Non-oriented (uniform magnetic properties) | Low core loss, high permeability |
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1. Power Transformers: ASTM A677 non-oriented silicon steel coil sheets, due to their superior properties such as ultra-low iron loss and high permeability, are widely used in power transformer cores, effectively reducing no-load losses and improving energy efficiency.
2. Distribution Transformers: Designed specifically for continuous operation of distribution transformers, they feature stable magnetic properties, low heat generation, and long service life.
3. High-Efficiency AI DC Transformers: Meeting the high requirements of hyperscale data centers, low iron loss and high magnetic flux density are crucial for reducing energy waste and maintaining power stability.
4. Reactors and Inductors: Reactors and inductors require strong directional magnetic properties and stable operation in AC magnetic fields.
5. Custom Industrial Transformers: Oil-immersed and dry-type industrial transformers can meet your high reliability requirements in industrial, renewable energy, and infrastructure projects.
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 Features
Roll Protection: The inner core uses steel or paper tubing, with edge protection plates or angle irons; the surface is covered with moisture-proof paper or PE film, and rust-preventive oil treatment is optional.
Securation Method: High-strength steel straps are used for binding; wooden pallets or trays are placed if necessary.
Bundling (Optional): Thin rolls can be bundled in multiple rolls, with separator paper to prevent scratches, and an outer plastic film for protection.
- Transportation Methods
Sea Freight: 20ft/40ft containers, secured with wooden wedges to prevent movement.
Land Freight: Flatbed truck or rail transport, secured with chains or brackets.
- Handling and Storage
Use coil hooks, lifting tools, or C-frames to avoid dragging.
Rolls must be stored upright, off the ground, to prevent deformation or rust.
Keep dry and well-ventilated; avoid stacking 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 ASTM A677 / A677M non-oriented electrical steel coil?
Non-oriented electrical steel coil is a type of silicon steel with good magnetic permeability and low iron loss. It conducts magnetically uniformly in all directions and is widely used in electrical equipment such as transformers, motors, and generators.
2. What are the common thicknesses and widths?
Thickness: Typically 0.27 mm, 0.30 mm, 0.35 mm, etc. (customization available upon request)
Width: 600 mm ~ 1250 mm (customization available)
3. What are the surface treatment options?
Insulating varnish treatment (surface coating): Used to reduce eddy current losses.
Rust-preventing oil coating: Prevents oxidation during transportation and storage.
VCI protective paper or PE film packaging: Moisture-proof and corrosion-proof.
4. What are the packaging methods?
The inner core of each coil is made of steel or paper tubing.
The rolled edges are secured with corner protectors and steel strips.
The outer layer is wrapped with moisture-proof paper or plastic film. Small coils can be bundled into sets.
5. What are the differences between ASTM A677/A677M and other electrical steel standards?
Non-oriented (NO): Uniform magnetic properties, consistent performance in all directions.
Oriented (GO): Superior magnetic properties along the rolling direction, mainly used in large transformers.
ASTM A677/A677M places particular emphasis on electrical and mechanical properties, suitable for motors and general industrial equipment.
6. Is customization possible?
Yes, thickness, width, coil weight, surface treatment, and packaging can be customized according to customer requirements.
7. How is quality guaranteed?
Production strictly according to ASTM A677/A677M standards.
Each batch of steel coils has a heat value/batch number for traceability.
Third-party inspection reports (such as SGS, BV) are available.
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