Technical Data Sheet
Mumetal is 80% nickel with additions of iron and molybdenum as main elements in turn this alloy offers an extremely high initial permeability. It is only moderately resistant to moisture and atmospheric corrosion, it used mainly in in transformer cores but is well known for its magnetic properties which are used for shielding electrical components from magnetic fields. "HYMU 80" has a minimum DC permeability of 80,000 at a flux density of 40 gauss when heat treated by the recommended procedure and test in accordance with ASTM 596.
| Chemical Composition Limits | ||||||||||
| Weight% | Ni | Cu | Cr | S | P | Si | Mn | C | Mo | Fe |
| Hymu 80 (Comp1) | 79.0-80.6 | 0.008 | 0.02 | 0.42 | 0.95 | 0.03 | 3.8-5 | Rem | ||
| MIL N 14411C (Comp2) | 75.0-77.0 | 4.0-6.0 | 3.0 | 0.02 | 0.02 | 0.50 | 1.8 | 0.05 |
Typical Mechanical Properties
| Mu-Metal | ||
| Yield Strength (psi) | Tensile Strength (psi) | Elongation in 2" (%) |
| 44,000 | 100,000 | 40 |
| Mechanical Properties in the Annealed Condition |
Physical Properties (Annealed Condition)
Specific Gravity – 8.7g/cm
Curie Temperature – 830°F (410°C)
Electrical Resistivity, 349 ohm circ mil/foot 0.55 ohm mm²m
Density
lb/cu.in. – 316
Thermal Conductivity – 134 btu-inch/ft hour
°F 0.32 W/cm °C
Coefficient of Thermal Expansion, in./in.
°F x 10 (-******)
7.2in/in °F x 10-6 between 70 and 400F
13cm/cm/
°C 10-6 between 30 and 204 °C
Availability
Mumetal is available in Sheet, Strip, Bar, Tubes and Rod. Contact Sales for further availability.
Specifications
Permalloy
HYMU 80
MAG 7904
MIL N 14411 C, COMP. 1
ASTM A753-78 and ASTM 596