MuMETAL® is used primarily in low intensity fields where high attenuation,
high initial permeability and high shielding efficiency are desired. Available
as stress annealed (partially annealed for ease of machinability) sheet stock
is used for fabricated shields such as enclosures, cylinders, cans, channels
or 3D boxes. Typically, atmospherically controlled annealing is required
after stamping, machining, bending, rolling or welding to provide maximum
shielding performance. MuMETAL® Stress Annealed alloy is available in many
forms, but most shields are fabricated from our sheet stock in gauges from
.014" to .062" thickness [0,36mm to 1,57mm]. MuMETAL® Foil is fully annealed
and available in stock gauges from .002" to .010" thickness
[0,05mm to 0,25mm].
MuMETAL® is typically stocked in a stress annealed state to allow further fabrication,
stamping, severe forming or welding. During fabrication, a material’s grain structure
is weakened. After final fabrication processes are completed, grain structure is
then modified by controlled atmospheric annealing to relieve stress in the material,
resulting in larger grain structure, softer temper, and ultimate shielding performance.
Although MuMETAL® is available in many forms, most shields are fabricated from foil
or sheet stock.
When your shield design requires severe forming, stamping and/or
welding, specifying MuMETAL® on your drawings insures you will receive
the highest level of initial permeability and shielding efficiency available.
And, MuMETAL® is formulated and manufactured to exacting standards
which allow consistent fabrication and final anneal.
Not only does Magnetic Shield Corporation offer MuMETAL® alloy, we
can provide a full range of manufacturing services. From your drawing
or sketch, we can waterjet, laser, EDM, shear, slit, punch, blank, stamp,
chemical etch, form, bend, roll, spot-weld, heliarc weld, and/or laser weld.
Using MuMETAL® alloy, we can produce complete magnetic shields, to
your drawings or specifications.
MuMETAL® Chemical Composition % In
Nickel (Ni) 80-81%
Molybdenum (Mo) 4.5-6%
Silicon (Si) 0.05-0.4%
Manganese (Mn) 0-0.5%
Carbon (C) 0.01%
Iron (Fe) Balance
*Composition may vary by production lot.
TYPICAL ANNEALED PROPERTIES
0.2% Yield Strength 49ksi (338 MPa)
Density 0.316 lb/in³ (8.7 g/cm³)
Tensile Strength 99 ksi (682 MPa)
Electrical Resistivity 60 micro-ohm cm
Elongation 32% in 2" (51 mm)
Grain Size ASTM 7 or finer
Hardness 15T 85
TYPICAL MAGNETIC PROPERTIES*
DC µ @ 40 gauss 80,000
DC µ @ 100 gauss 105,000
DC µ maximum 350,000
DC Hc 0.0005 Oe
DC Br (gauss) 4,000
AC 60Hz @ 40 gauss 65,000
*Data are typical of .014" [0.36mm] annealed sample and should be not be construed as maximum or minimum values for specification or final design. Data for each material thickness and/or lot may vary.