Products Features
High Permeability and Low Coercivity
The core advantage of Permalloy 45 lies in the inherent magnetic properties of its nickel-iron matrix. The optimized nickel content significantly enhances the alloy's initial permeability and maximum permeability, enabling rapid magnetization and demagnetization under weak magnetic fields with extremely low hysteresis loss. Typical coercivity is as low as < 20 A/m, and initial permeability can reach > 10,000. It performs exceptionally well in applications involving weak signal processing and high-sensitivity sensors, making it an ideal material for achieving magnetic shielding and high-sensitivity magnetic devices.
Excellent Magnetic Shielding Performance
Permalloy 45 has high permeability and low hysteresis loss, which effectively guides and closes external magnetic fields through itself, thereby protecting sensitive electronic components from interference by stray magnetic fields. In direct current and low-frequency alternating current magnetic fields, its shielding effect is far superior to that of ordinary silicon steel and ferrite materials. It is suitable for cutting-edge fields such as precision instruments, medical equipment, and communication systems that require precise control and shielding of weak magnetic fields.
Good Temperature Stability
Permalloy 45 exhibits excellent magnetic performance stability over a wide temperature range of -50°C to 200°C, with much lower variation rates in permeability and operating point compared to conventional soft magnetic materials. Its Curie temperature is approximately 450°C, allowing it to maintain consistent magnetic characteristics across a broad temperature spectrum. This makes it suitable for applications such as automotive electronics, industrial control, and aerospace where strict temperature stability requirements are imposed.
Good Machining and Forming Properties
Permalloy 45 exhibits excellent hot and cold working properties, allowing it to be forged, rolled, and stamped into shape. Its ductility surpasses that of most brittle soft ferrite magnetic materials, 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 machining operations such as turning, milling, drilling, and grinding are applicable; the use of hard metal cutting tools is recommended.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
45.0 - 46.5% |
Core elements that significantly improve magnetic permeability and Curie temperature |
|
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 |
8.17 g/cm³ |
Room temperature (20°C) |
|
Curie temperature |
≈ 450°C |
- |
|
Saturation magnetic flux density (Bs) |
≈ 1.6 T |
Room temperature |
|
Coercive force (Hc) |
< 20 A/m |
Annealed state |
|
Initial permeability (μi) |
> 10,000 |
Annealed state |
|
Maximum permeability (μmax) |
≈ 150,000 |
Annealed state |
|
Resistivity |
≈ 0.45 μΩ·m |
Room temperature |
|
Coefficient of Thermal Expansion (20-100°C) |
10.5 × 10⁻⁶ /K |
- |
|
Elastic modulus (Young's modulus) |
205 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) |
≥ 10,000 |
0.1 mT magnetic field |
|
Maximum permeability (μmax) |
≈ 150,000 |
Annealed state |
|
Coercive Force (Hc) |
≤ 20 A/m |
Annealed state |
|
Saturation magnetic flux density (Bs) |
≥ 1.55 T |
800 A/m magnetic field |
|
Magnetic flux density (B) |
≈ 1.5 T |
Under a magnetic field of 2,000 A/m |
High-temperature performance
The Curie temperature of Permalloy 45 is approximately 450°C. Below are typical reference values for how magnetic properties change with temperature:
|
Temperature |
Saturation magnetic flux density (Bs) |
Note |
|
Room Temperature |
≥ 1.6 T |
- |
|
100°C |
≈ 1.5 T |
Performance retention rate > 93% |
|
200°C |
≈ 1.3 T |
Performance retention rate > 81% |
|
300°C |
≈ 1.0 T |
Performance retention rate > 62% |
Antioxidant Performance:
Permalloy 45 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 45 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 45 is a metallic soft magnetic alloy and is not suitable for corrosive liquid environments such as strong acids and strong alkalis. When exposed to a humid environment for a long time, rust prevention treatment is recommended.
Permalloy 45 is specifically designed for magnetic applications requiring high permeability, low loss, 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.
-
Electronics and Communications: Audio transformers, miniature inductors, magnetic amplifiers, filters, pulse transformers, current transformers, weak magnetic field sensors.
-
Aerospace: Inertial navigation magnetic shielding, avionics shielding, gyroscope magnetic shielding, altimeter magnetic shielding, radar system sensitive component shielding.
-
Medical Equipment: MRI magnetic shielding, medical sensors, magnetic focusing systems for electron microscopes, magnetoencephalography / magnetocardiography (MEG/MCG) magnetic shielding.
-
Automotive Industry: Magnetic circuits of electromagnetic valves in fuel injection systems, variable reluctance position sensors, ABS sensors, electronic throttle pedal sensors.
-
Precision Instruments: Electromagnetic balances, magnetometers, magnetic circuits of spectrometers, magnetic shielding of particle detectors, magnetic shielding of quantum sensors.
-
Research and Metrology: Standard inductors, fluxmeters, magnetic measuring instruments, precision current transformers, quantum Hall effect measurement systems.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Permalloy 45 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 45?
Q: What heat treatment is required for Permalloy 45?
Q: What is the maximum usage temperature?
Q: What is the difference between Permalloy 45 and Hiperco® 50?
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