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The precision alloy 50H is a low-nickel permalloy. Permalloys are alloys based on iron and nickel with high magnetic permeability. The composition is distinguished by low-nickel (40−50% Ni), and high-nickel (72−82% Ni)).
The 50H alloy is optimized for the optimization of magnetic properties by such elements as molybdenum, chromium, copper, etc. It is melted in a vacuum or under the protection of a neutral gas.
Percentage composition 50Н GOST 10994−74 .
Cold rolling of sheets and tapes is used with subsequent annealing to increase the magnetic properties. Permalloys can easily magnetize, have a high sensitivity to the change in the magnetic field.
Initially, 50H was used to reduce signal distortion in telecommunications cables as a compensator of their distributed capacitance. Today, this permalloy serves for the manufacture of magnetic field sensors, for example, in chip transformer plates, for elements of magnetic recording heads. Due to low magnetostriction, the 50H alloy is used in precision magneto-mechanical devices and other devices where dimensional stability is required in a changing magnetic field.
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