Moly Permalloy® is a Nickel-Iron-Molybdenum alloy with a magnetic permeability that makes it suitable for electrical shielding applications.
The alloy can be readily formed from the annealed temper.Effective magnetic shielding is provided by annealing at 1900°F or higher. Joining is accomplished by spot welding or tungsten inert gas welding.
Available Sizes:
Moly Permalloy® is available from Hamilton Precision Metals as strip product from 0.0005” to 0.015” (0.0127 mm to 0.38 mm) in widths to 12.0” (304.8 mm). It is also
available in foil as thin as 0.000100” (0.00254 mm) in widths of 4.0” (101.6 mm) maximum. The metal conforms to ASTM A753, Type 4 and MIL N 14411, Type 1.
Nominal Composition
| MOLY PERMALLOY®
NOMINAL COMPOSITION |
| Nickel |
80.0%
|
| Molybdenum |
4.8%
|
| Manganese |
0.50%
|
| Silicon |
0.35%
|
| Iron |
Balance
|
Mechanical Properties
| MOLY PERMALLOY® MECHANICAL PROPERTIES |
|
ANNEALED |
COLD ROLLED |
| Ultimate Tensile Strength |
90,000 PSI |
160,000 PSI |
| Yield Strength (0.2% Offset) |
35,000 PSI |
150,000 PSI
|
| Elongation in 2” * |
30%
|
1% |
| Modulus of Elasticity (Tension) |
32 X 106
PSI
|
- |
*The measured elongation will be less as thickness decreases to 0.002” and less
These values may be adjusted by control of process variables – consult HPM for desired values
Physical Properties
| MOLY PERMALLOY® PHYSICAL PROPERTIES |
| Density |
0.315 lbs./cu.in. |
| Melting Point (Approx.) |
1450°C |
| Electrical Resistivity @ R.T. |
59 Microhm·cm |
|
Temperature Coefficient of Resistivity (-20° to 500°C)
|
1100 PPM/°C
|
| Thermal Expansion Coefficient (25° to 200°C) |
12.7 x 10-6/°C |
| Thermal Conductivity @ R.T. |
34.6 W/m·K |
| Curie Temperature |
455°C |
DC Magnetic Properties
Coercive Force from Hmax = 1.0 oersted
Permeability @ 40 gauss
Permeability @ maximum induction
Saturation Induction
Maximum Residual Induction
|
0.02 max. oersted
16/cycle
50,000
200,000
8,000 gauss
3,500 gauss |
| Magnetic Attraction |
Yes |
Typical values to guide alloy selection but are not a guarantee of minimum or maximum.