About Alloy
Magnetic Shielding Alloy Mu-Metal / HY-MU 80 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.
Product Form
● Permalloy
● HYMU 80
● MAG 7904
● MIL N 14411 C, COMP. 1
● ASTM A753-78 and ASTM 596
Chemical Composition
| 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 |
Property
| Yield Strength (psi) | Tensile Strength (psi) | Elongation in 2" (%) |
| 44,000 | 100,000 | 40 |
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
Application
HyMu 80 has been used primarily in transformer cores, tape wound toroids and laminations
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