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Magnetic Shielding Material
Mu metal
Home / Mu metal / What are the specifications of MU metal
What are the specifications of MU metal January 9,2020.
The Mu metal is 80% nickel, 4.5% molybdenum, the balance of iron, and a soft ferromagnetic alloy, which means that it does not retain a magnetic field after removing external magnetizing forces.

Specifications: ASTM A-753 alloy 4, MIL N-14411C composition.

Mu-metal provides extremely high initial and maximum magnetic permeability with minimal hysteresis losses. It also has low coercivity, low core loss, and low remanence.

In order to achieve the required magnetic properties, mumetal requires a complete final heat treatment in a dry hydrogen atmosphere furnace with a dew point <-40 ° C at 1100-1180 ° C for 2-4 hours. About 40 times.

The annealing process increases mumetal® grain size, which increases magnetic domains. However, these coarse grains are susceptible to severe impact or further machining, and the permeability in these areas will be reduced. This can be corrected by re-annealing.

mumetal's high permeability provides a low reluctance path for magnetic flux, making it useful in magnetic shielding against DC and AC magnetic fields.

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