Safeni 48 (Wire)
Datasheet updated 2013-02-18 14:23:36 (supersedes all previous editions)
Safeni 48 is a soft magnetic iron-nickel alloy with high relative permeability, low coercive field strength and high saturation magnetization. The grade is characterized by low content of non-metallic inclusions and uniform properties.
Safeni 48 can be used in many applications requiring high relative permeability and a high saturation magnetization. The grade is typically used in the following applications:
- Solenoid valves
- AC and DC relays
- Parts for measuring instruments
- Magnetic shielding for electronic instruments and communications devices
- UNS K94800, K94840
- W.Nr. 1.3922, 1.3926, 1.3927
- DIN Ni 48, RNi 12, RNi 8
Chemical composition (nominal), %
|Proof strength||Proof strength||Tensile strength||Tensile
|Rp0.2, MPa||Rp0.2, ksi||Rm, MPa||Rm, ksi||HV|
|Density||8.2 g/cm3||0.30 lb/in3|
|Specific heat capacity||480 J/kg °C||0.11 Btu/lb °F|
|Thermal conductivity||14 W/m °C||8 Btu/ft h °F|
|Resistivity||0.43 μΩm||16.9 μΩin|
|Temp., °C||Per °C||Temp., °F||Per °F|
|Coercive field strength, Hc||≤5 A/m|
|Remanent flux density, Br||1.1 T (Wb/m2)|
|Saturation magnetization, Bs||1.5 T (Wb/m2)|
|Max relative permeability, μr, max||≥100 000|
After machining, material must be annealed according to the table below to obtain the magnetic properties described above. Mechanical processing sets up internal strains in the material which impair the magnetic properties. Even straightening, if this is required, should be carried out before annealing.
Components should be thoroughly cleaned and degreased prior to annealing and the recommended annealing temperature range is given in the table.
Annealing should be carried out in a protective atmosphere. Only vacuum furnaces or hydrogen atmospheres are recommended.
|Time at full temperature||2 to 4 hours|
|Atmosphere||Hydrogen or vacuum|
Slow cooling, max 200°C/h (360°F/h), to below
Forms of supply
Safeni 48 can be delivered as round wire, shaped wire (profile) and strip according to the tables. Other sizes can be offered on request.
Round wire is supplied cold drawn or annealed, with a bright or ground surface. The round wire is delivered in coils, on spools, or in straightened lengths between 2 and 4 m, depending on diameter.
|Diameter||0.10 to 12 mm (0.004–0.472 in.)|
Shaped wire (profile)
Shaped wire (profile) is supplied cold rolled or annealed, with a bright surface, in coils, on spools or in straightened lengths between 2 and 4 m.
|Diameter||Up to 8 mm (0.315 in.)|
|Width||Up to 21 mm (0.827 in.)|
Strip is supplied cold rolled or annealed, with a bright or ground surface in coils, or in straightened lengths between 2 and 4 m.
|Thickness||0.10–4.0 mm (0.0039–0.157 in.)|
|Width||10.0–210 mm (0.39–8.3 in.)|
Other sizes can be offered on request.
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Sandvik materials.