(i) Soft iron silicon alloy
(ii) Soft iron nickel alloys
Soft Iron Siicon Alloys
Iron Silicon alloys are generally utilized in applications requiring higher electrical resistivity, higher permeability, lower coercive force and residual magnetism than provided by either carbon steels or soft magnetic stainless steels like the Magival® series.
Each single grade possesses its enhanced machinability option where required.
Iron Silicon alloys are normally supplied within the annealed condition since the simplest magnetic properties are often reached through a soft magnetic annealing administered stern machining.
Iron Silicon alloys rust easily under ordinary atmospheric conditions and thus a protective coating should be applied to the warmth treated parts if exposed during their life cycle.
Due to their high magnetic properties, Iron Silicon Alloys are mainly utilized in the manufacture of relays, solenoids and injectors parts.
Soft iron nickel alloys
Nickel–iron alloys are of particular interest because a broad sort of qualitatively different magnetic properties are often obtained by adjusting the composition and therefore the preparation process.
There are not any restraints to rolling so it's possible to get good laminations with thickness right down to 10–20 μm, with great benefits for classical losses.
Both the crystal anisotropy and therefore the magnetostriction cross the zero value for compositions around 80 wt.% Ni. Treatments on materials with approximately this composition (and the deliberate introduction of other elements like Mo, Cu, and Cr) yield materials with extremely low hysteresis losses (coercive field but 1 Am−1), and a spread of hysteresis loop shapes controlled by induced anisotropy.
The mixture of low hysteresis losses and low classical losses makes these materials most suited to applications at high frequencies.
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