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Iron Fe Bal.
Nickel Ni 49.0~50.5%
Silicon Si 0.15~0.3%
Manganese Mn 0.3~0.6%
Copper Cu ≤0.2%
Carbon C ≤0.03%
Sulphur S ≤0.02%
Phosphorus P ≤0.02%

  is a nickel-iron soft magnetic alloy. The main component is composed of about 50% Ni, 48% fe and other trace elements. It has the characteristics of high magnetic permeability and high saturation magnetic induction.

 Ni50 alloy is smelted in a vacuum induction furnace. After being cast into a steel ingot, it is hot forged into a slab, then after hot rolling, pickling, and surface finishing, it is cold rolled into a finished strip or forged into the required bar. It has a higher saturation magnetic induction intensity and lower coercivity, and has a lower static magnetic permeability in the iron-nickel soft magnetic alloy.

The process performance of Ni50 soft magnetic alloy is relatively stable, which creates good conditions for mass production of parts with relatively consistent magnetic properties. Most of these alloys are said to be used under alternating magnetic fields. They are mainly used for high-conductivity yoke irons, sensitive relays, low-loss micromotors, low-power power transformers, pulse transformers, transistor switches, magnetic amplifiers, magnetic modulators, and sensitive signals. Input and output transformers, magnetic sensors of aviation magnetic heading instruments, magnetic sensitive components in magnetic measuring instruments, moving and stators in precision electric meters, magnetic shielding and magnetic temperature compensation components.

Ni50 Mechanical performance

Yield strength Tensile Strength Elongation
Mpa Mpa %
685 780 3~35
Density Resistivity
at 20℃ 
Coefficient of linear expansion (20℃~200℃) Saturation magnetostriction coefficient Curie point
(g/cm3)  (Ωmm2/m) X10-6/℃ λθ/ 10-6 Tc/ ℃
8.2 0.45 9.2 25.0 500

Ni50 Physical properties
 Material magnetic properties
Ni50 Initial permeability Maximum permeability Coercivity Saturation magnetic induction
Cold rolled strip/plate
Thickness, mm
μ0.08/ (mH/m) μm/ (mH/m) Hc/ (A/m) BS/ T
0.05 mm 2.5 35 20 1.5
0.1~0.19 mm 3.8 43.8 12
0.2~0.34 mm 4.4 56.3 10.4
0.35~1.0 mm 5.0 65 8.8
1.1~2.5 mm 3.8 44.0 12
8-100 mm 3.1 25.0 24

Ni50 Heat treatment method
Annealing medium Dry hydrogen (the dew point is not higher than -40℃) or vacuum, the residual pressure is not more than 0.1Pa
Heating temperature and speed 1100~1150℃
Holding time/h 3~6
Cooling rate Cool to 600℃ at a rate of 100 ~ 200 ℃/h, and quickly cool to 300℃ and get out of the oven
Ni50 Supply form and specification
Alloy grade Form Size
Ni50 Wire D= 0.1~8mm
Ni50 Strip W= 8~390mm T= 0.3mm
Ni50 Foil W= 10~100mm T= 0.01~0.1mm
Ni50 Bar Dia= 8~100mm L= 50~1000mm

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