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The precision 79HM alloy is a high-nickel permalloy. Permaloy — a material based on nickel and iron with significant magnetic permeability in weak fields. Low-nickel (40−50% Ni) and high-nickel permalloy (72−82% Ni) are produced. To enhance the magnetic permeability, they are doped with elements such as copper, manganese, etc. Each of the groups has a certain degree of manifestation of electromagnetic properties. Due to the significant nickel content, the 79HM alloy has a high electrical resistance and corrosion resistance. The permalloy is melted in vacuum or under protection of argon. The rolling is stamped with a cold-rolled method with final annealing, to optimize the electromagnetic properties.
The percentage composition of 79NM GOST 10994−74 .
Mark 79HM has a min magnetostriction. Used in high-precision instruments with stable operation in an alternating electromagnetic field. The electrical resistance of the 79HM brand varies only within 5%, depending on the strength and direction of the fields. Serves for the manufacture of transformer plates, parts for recording magnetic heads, cores of compact transformers, contactless relays.
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