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The high production quality of the alloy, or, as it is also called kovar, is guaranteed by a balanced composition, the absence of any impurities. In the classical version, the mixture consists of 29% nickel, 17% cobalt and iron base. Such a successful combination of the basic chemical ingredients of the composition provides unique performance characteristics. First, such material differs from other alloys of this class by a rather high coefficient of specific electrical resistance and almost zero index of linear temperature expansion in a wide temperature range (from twenty to four hundred degrees) against a background of excellent thermal conductivity (about 19 W / m◦C). These characteristics fully explain the good performance parameters of the material and the absence of significant plastic deformation of parts made from it, even with a significant increase in the temperature index of the working area. However, before using such a raw material, it is worth taking into account its significant disadvantage in the form of low corrosion resistance in a humid environment. To increase the stability of semi-finished products from such an alloy to wet corrosion, they are covered with a protective layer.

Percent composition according to GOST 10994−74
Alloy FROM Mn Fe P S Ni Co Cr Al Cu Ti Si
29 NK ≤0.03 ≤0,4 51.14−54.5 ≤0.015 ≤0.015 28.5−29.5 17−18 ≤0.1 ≤0.2 ≤0.2 ≤0.1 ≤0.3


The circle and wire of the 29KNK brand are used in the production of capacitors, however, in order to increase the material’s resistance to moisture, the alloy is preliminarily coated with a thin silver protective layer. Also, the wire is highly demanded in radio electronics and in the electrovacuum industry. The presence of expensive nickel and cobalt in the material increases the cost of wire and wheel, but high working and technological characteristics, as well as reliable long-term operation completely compensate for the initial costs.


A huge choice on the website of OOO «_" of products made of precision materials, including the alloy of the brand «29KK», allows you to take into account the wishes of any customer. Convenient delivery and constant attention to the customer will make the purchase as comfortable as possible, and compliance of all semi-finished products with high quality standards will guarantee reliable operation of such products on any part of the industrial complex. The diverse range of range and brand 29NK wire stock makes it easy to choose the appropriate option to implement Telegram ie engineering designs.