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Dr. Dmitri Kopeliovich
Nickel alloys are designated by various designation systems however the alloys are usually identified according to their trade names.
There are four main groups of nickel alloys:
These alloys contain not less, than 99% of nickel.
Three-digit numbers (2xx, 3xx) are used as trade names of commercial nickel.
The alloys are characterized by very good corrosion resistance and high ductility.
These alloys contain about 30% of copper, which form solid solution with nickel.
The accepted trade name of Nickel-Copper Alloys is Monel.
Nickel-Copper Alloy, containing aluminum and titanium as additional alloying elements (Monel K-500), is heat-treatable and may be strengthened by precipitation hardening.
The major alloying elements of these alloys (15-22% of chromium and up to 46% of iron) form solid solution with nickel.
The alloys may be hardened by cold work.
The non-heat-treatable Nickel-Chromium-Iron Alloys are identified according to their trade names Inconel, Incoloy and Hastelloy.
These alloys may be strengthened by precipitation hardening due to presence of additional alloying elements: aluminum, titanium, silicon.
Nimonic, Inconel X-750, Udimet, Waspaloy, Rene, Astroloy are some of the trade names of heat-treatable Nickel-Chromium-Iron Alloys.
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