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to Nickel alloys
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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