Mu-Metal Supplier, Stockist and Exporter
Aurico Alloys LLP supplies Mu-Metal (ASTM A753 Alloy 4, UNS N14080) as sheets, plates, foil, strip, round bar, pipe, tube and wire from stock in Mumbai.
Mu-Metal is a soft magnetic nickel-iron alloy with exceptionally high permeability and very low coercivity. It does not block a magnetic field so much as offer it an easier path, drawing flux around whatever sits inside the shield - which is why it is the standard material wherever low-frequency magnetic interference has to be kept out of sensitive instrumentation.
Specifications and Supply Range
| Specification | ASTM A753 Alloy 4 |
|---|---|
| UNS number | N14080 |
| Also known as | HyMu 80, Permalloy 80, Mumetal |
| Foil and strip | 0.05 mm to 0.50 mm thick, to 600 mm wide |
| Sheet and plate | 0.5 mm to 6.0 mm thick, to 1250 mm wide |
| Bar and wire | Round bar 6 mm to 150 mm; wire 0.10 mm to 8.0 mm |
| Certification | EN 10204 3.1 mill test certificate |
Equivalent Grades & Designations
| Property | Value |
|---|---|
| UNS number | N14080 |
| Werkstoff / EN number | 2.4545 |
| EN designation | NiFe15Mo |
| Density | 8.74 g/cm3 |
| Melting range | 1454.4 °C |
| Maximum permeability | 200000 |
| Coercivity | 0.008-0.02 Oe |
| Residual induction | 3500 G |
| Curie temperature | 390 °C |
| Mean specific heat | 494 J/kg·K |
| Thermal conductivity | 34.6 W/m·K |
| Electrical resistivity (21 °C) | 58 µΩ·cm |
| Modulus of elasticity (cold drawn) | 232 GPa |
| Modulus of elasticity (hydrogen annealed 1121 °C) | 230 GPa |
| Modulus of elasticity (after process anneal 871 °C) | 217 GPa |
| Mean coefficient of thermal expansion (-75 to 25 °C) | 10.8 µm/m·°C |
| Mean coefficient of thermal expansion (-50 to 25 °C) | 10.7 µm/m·°C |
| Mean coefficient of thermal expansion (-25 to 25 °C) | 10.4 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 50 °C) | 12.30 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 100 °C) | 12.40 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 200 °C) | 12.76 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 300 °C) | 13.00 µm/m·°C |
| Mean coefficient of thermal expansion (25 to 400 °C) | 13.30 µm/m·°C |
Identifiers and physical constants for Mu-metal. A dash means no such designation is published for this grade.
Chemical Composition
Nominally 80% nickel with 4.2 to 5.2% molybdenum and the balance iron, with carbon, silicon and manganese held low. The high nickel content is what produces the permeability; molybdenum raises electrical resistivity and improves the response to annealing.
Magnetic and Physical Properties
Initial relative permeability is typically above 20,000 and maximum relative permeability can exceed 200,000 after a full hydrogen anneal, with coercivity below 4 A/m and saturation induction around 0.75 tesla. Shielding effectiveness depends heavily on that final anneal: forming, cutting or drilling after annealing introduces stress that lowers permeability, so parts should be finished first and annealed last.
Industry Applications
| Industry | Typical use |
|---|---|
| Medical | MRI room shielding, magnetoencephalography enclosures and diagnostic instrumentation. |
| Scientific instruments | Electron microscope columns, photomultiplier tube shields and magnetometers. |
| Electronics | Transformer shields, sensor housings and cable wrapping against low-frequency interference. |
| Aerospace and defence | Navigation and guidance instrumentation shielding. |
| Audio | Microphone transformers, valve amplifier chokes and studio equipment. |
Frequently Asked Questions
Request a Quotation
Tell us the form, thickness and size and we will quote the same working day. Call +91 7977 88 6611 or email info@auricoalloys.com.