Kunial ( according to the first letters of the constituent elements ) is an alloy of copper (base) with nickel (4-20%) and aluminum (1-4%).
Dispersion hardening. Hardening + HFA + aging.
Two brands are distinguished: kunial A (MNA 13-3), containing 12-15% Ni and 2.3-3.0% Al, and kunial B (MNA 6-1.5) containing 5.5-6.5% Ni and 1.2-2.8% Al.
Kunial A is used for the manufacture of parts for special purposes, which must have both strength and high corrosion resistance . Kunial B is used for the manufacture of springs and other elastic elements for critical purposes, as well as in cryogenic technology due to its high frost resistance .
Kunial is used to make propellers . It has the strength of steel, but it resists corrosion much better. Kunial can be in the water for decades without rusting. To give the alloy extreme precision [ ambiguous ] to 80% of copper it is necessary to add 5% nickel and 5% aluminum, as well as 10% of other metals. Remelting is carried out at a temperature of 1183 degrees.
- Kolenko E.A. Laboratory Experiment Technology: A Guide. - SPb. : Polytechnic, 1994. - ISBN 5-7325-0025-1 .