Products Features
Extremely High Permeability and Extremely Low Coercivity
The core advantage of Permalloy 80 lies in the inherent magnetic properties of its nickel-iron matrix. The high nickel content (approximately 80%) significantly enhances the alloy's initial permeability and maximum permeability, enabling it to magnetize and demagnetize rapidly under very weak magnetic fields with extremely low hysteresis loss. Typical coercivity is as low as <4 A/m, and initial permeability can exceed 20,000, making it an ideal material for weak magnetic field signal processing and high-sensitivity sensor applications, and an excellent choice for achieving magnetic shielding and high-sensitivity magnetic devices.
Excellent Magnetic Shielding Performance
Permalloy 80, with its extremely high permeability and low hysteresis loss, effectively guides and closes external magnetic fields through itself, thereby protecting sensitive electronic components from stray magnetic field interference. In direct current and low-frequency alternating current magnetic fields, its shielding effectiveness far surpasses that of ordinary silicon steel, ferrite materials, and Permalloy 45/50. It is suitable for cutting-edge fields requiring precise control and shielding of extremely weak magnetic fields, such as precision instruments, medical equipment, and communication systems.
Good Temperature Stability
Permalloy 80 exhibits good magnetic performance stability over a wide temperature range of -50°C to 200°C, with much lower variation rates in permeability and operating points compared to ordinary soft magnetic materials. Its Curie temperature is approximately 460°C, allowing it to maintain consistent magnetic characteristics over a broad temperature range. This makes it suitable for applications with strict temperature stability requirements, such as automotive electronics, industrial control, and aerospace.
Good Machining and Formability
Permalloy 80 has good hot and cold working properties, allowing it to be forged, rolled, and stamped into shape. Its ductility is superior to most brittle soft magnetic ferrites, making it suitable for manufacturing complex magnetic shields, laminated cores, and precision stamped parts. Annealing can optimize magnetic properties, eliminate processing stresses, restore permeability, and reduce coercivity. Conventional mechanical machining (turning, milling, drilling, grinding) is applicable; hard metal cutting tools are recommended.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
79.0 - 81.0% |
Core elements that significantly improve magnetic permeability and reduce coercivity |
|
Mo |
4.0 - 5.0% |
Increase resistivity, reduce eddy current losses, and improve magnetic properties |
|
Fe |
Remaining quantity |
Matrix elements that provide high magnetic flux density and cost-effectiveness |
|
C |
≤ 0.02% |
Strictly control to ensure magnetic properties and purity |
|
Mn |
≤ 0.50% |
Strict control to prevent degradation of magnetic properties |
|
Si |
≤ 0.20% |
Strictly control to ensure consistency in magnetic properties |
|
Cr |
≤ 0.10% |
Strictly control to ensure permeability |
|
P |
≤ 0.015% |
Impurity elements |
|
S |
≤ 0.010% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
8.74 g/cm³ |
Room temperature (20°C) |
|
Curie temperature |
≈ 460°C |
- |
|
Saturation magnetic flux density (Bs) |
≈ 0.78 T |
Room temperature |
|
Coercive force (Hc) |
< 4 A/m |
Annealed state |
|
Initial permeability (μi) |
> 20,000 |
Annealed state |
|
Maximum permeability (μmax) |
≈ 250,000 |
Annealed state |
|
Resistivity |
≈ 0.55 μΩ·m |
Room temperature |
|
Thermal expansion coefficient (20-100°C) |
12.0 × 10⁻⁶ /K |
- |
|
Elastic modulus (Young's modulus) |
200 GPa |
Room temperature |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 450 MPa |
ASTM A753 |
|
Yield Strength (0.2% Offset) |
≥ 200 MPa |
ASTM A753 |
|
Elongation |
≥ 25% |
ASTM A753 |
|
Hardness |
≈ 85 HRB |
- |
Magnetic Properties (Annealed Condition, Typical Values)
|
Performance |
Numerical value |
Test conditions |
|
Initial permeability (μi) |
≥ 20,000 |
0.1 mT magnetic field |
|
Maximum permeability (μmax) |
≈ 250,000 |
Annealed state |
|
Coercive Force (Hc) |
≤ 4 A/m |
Annealed state |
|
Saturation magnetic flux density (Bs) |
≥ 0.75 T |
800 A/m magnetic field |
|
Magnetic induction intensity (B) |
≈ 0.7 T |
Under a magnetic field of 2,000 A/m |
High-temperature performance
The Curie temperature of Permalloy 80 is approximately 460°C. Below are typical reference values for how magnetic properties change with temperature:
|
Temperature |
Saturation magnetic flux density (Bs) |
Note |
|
Room Temperature |
≥ 0.78 T |
- |
|
100°C |
≈ 0.74 T |
Performance retention rate > 94% |
|
200°C |
≈ 0.65 T |
Performance retention rate > 83% |
|
300°C |
≈ 0.50 T |
Performance retention rate > 64% |
Antioxidant Performance:
Permalloy 80 exhibits good antioxidant properties within normal operating temperature ranges. For long-term exposure at high temperatures (>400°C), surface coating protection is recommended.
Organizational Stability:
By optimizing heat treatment, the grain structure of Permalloy 80 can be precisely controlled to ensure consistency in magnetic and mechanical properties. Annealing temperature and time directly affect the final magnetic properties and must be strictly controlled.
Applicable Media:
1. Conventional atmospheric environment
2. Electrical insulation media
3. Aviation kerosene, hydraulic oil
4. High-temperature gas environment (≤ 200°C)
Note: Permalloy 80 is a metallic soft magnetic alloy and is not suitable for corrosive liquid environments such as strong acids and strong alkalis. When exposed to humid environments for a long time, rust prevention treatment is recommended.
Permalloy 80 is designed for magnetic applications requiring extremely high permeability, very low losses, and high reliability. It is recommended for use in the following areas:
Application Fields
-
Magnetic Shielding: Magnetic shielding housings for precision instruments, oscilloscope shielding, electron microscope magnetic shielding, communication equipment shielding, sensor shielding shells, and magnetic recording head shielding.
-
Electronics and Communications: Audio transformers, miniature inductors, magnetic amplifiers, filters, pulse transformers, current transformers, weak magnetic field sensors, and magnetic recording heads.
-
Aerospace: Inertial navigation magnetic shielding, avionics equipment shielding, gyroscope magnetic shielding, altimeter magnetic shielding, and shielding of sensitive components in radar systems.
-
Medical Equipment: MRI magnetic shielding, medical sensors, magnetic focusing systems for electron microscopes, magnetoencephalography/magnetocardiography (MEG/MCG) magnetic shielding, and shielding for biomagnetic measurements.
-
Automotive Industry: Magnetic circuits of electromagnetic valves in fuel injection systems, magnetic reluctance position sensors, ABS sensors, and electronic throttle pedal sensors.
-
Precision Instruments: Electromagnetic balances, magnetometers, magnetic circuits of spectrometers, magnetic shielding of particle detectors, and magnetic shielding of quantum sensors.
-
Research and Metrology: Standard inductors, fluxmeters, magnetic measuring instruments, precision current transformers, and quantum Hall effect measurement systems.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Permalloy 80 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Pipe / Tube
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.05 – 3.0 mm |
Diameter Φ0.1-10mm |
|
Customization Capability |
Hot-rolled or cold-rolled plates, ultra-thin sheets (starting from 0.1mm), stamped parts, and cut-to-length cutting |
Forged bars, hot-rolled bars, polished bars, and shaped bars |
Seamless pipes, welded pipes, fixed-length cutting |
Precision strip materials, stamping coil stock, laminated blanking, non-standard width |
Precision drawing, special surface treatment |
Why Choose Us? - Reliable Engineering Technology. Dependable Delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of Permalloy 80?
Q: What heat treatment is required for Permalloy 80?
Q: What is the maximum operating temperature?
Q: What is the difference between Permalloy 80 and Permalloy 45?
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