Pipe 79NM - Magnet 7904
Permalloys are characterized as iron-nickel alloys, which have a relatively high permeability in weak fields. By its composition are divided into low-nickel, containing up to 50% Ni and high nickel, containing up to 82% Ni. The precision grade 79HM refers to the latter, containing 78.5−80% Ni. The affiliation of each alloy to a certain group depends on the degree of expression of electromagnetic properties. The grade 79NM has a lower electrical conductivity, but greater corrosion resistance. To enhance the electromagnetic qualities, it is alloyed with elements such as chromium, copper, molybdenum. Melting is carried out in a vacuum or a neutral gas. The sheets and tapes are punched with a cold-rolled method, followed by annealing, to increase the magnetic properties.
Due to the small magnetostriction, this alloy is used in high-precision instruments with a stable characteristic in an alternating electromagnetic field. It has small changes in electrical resistance (not more than 5%), which are determined by the strength and direction of the fields. The alloy grade 79NM is used for making transformer plates, magnetic recording heads, small transformers cores, non-contact relays.
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The choice of precision alloys is not such a simple task, since a number of factors need to be taken into account here. The company «Avek Global» has a wide selection of precision metal rolling to order. At us you can buy products from alloy 79НМ on the most favorable terms. Our specialists are always ready to help you when choosing the right products, on which depends the efficiency and reliability of the future equipment. They not only help you determine the optimal parameters of the product, but will also offer the best price. We guarantee the high quality of our products and timely delivery.