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Non-heat-treatable nickel-chromium-iron alloys

Dr. Dmitri Kopeliovich

Non-heat-treatable Nickel-Chromium-Iron Alloys are nickel base alloys, containing 15-22% of chromium (Cr) and up to 50% of iron (Fe) as the major alloying elements.

Non-heat-treatable Nickel-Chromium-Iron Alloys do not contain sufficient amounts of such additional alloying elements like aluminum, silicon, beryllium and titanium; therefore these alloys can not be strengthened by precipitation hardening (in contrast to the heat-treatable Nickel-Chromium-Iron alloys).

Chromium and iron form mono-phase solid solution in nickel.

The alloys may be hardened by cold work.

Annealing of non-heat-treatable Nickel-Chromium-Iron Alloys is conducted at 1740-2150°F (950-1175°C).

Non-heat-treatable Nickel-Chromium-Iron Alloys are identified according to their trade names Inconel, Incoloy and Hastelloy.

Non-heat-treatable Nickel-Chromium-Iron Alloys have very good mechanical strength and high resistance to Creep combined with excellent corrosion resistance in chlorine-ion solutions, to sulfur compounds and to other organic and inorganic compounds.

The alloys are highly resistant to oxidation at high temperatures.

Non-heat-treatable Nickel-Chromium-Iron Alloys possess good machinability, weldability and workability.

The alloys are used for manufacturing gas turbine parts, heat-treating equipment (muffles, retorts), equipment for processing fatting acids, evaporator tubes, chemical processing equipment, distillation columns, combustion systems, heat exchangers, steam generator tubing of nuclear power plants.

Chemical compositions of some non-heat-treatable nickel-chromium-iron alloys

Designation Cr,% Fe,% Mo,% Al,% Ti,% C,% Others,% Ni,%
Inconel 600 14-17 6-10 - - - - - 72 min.
Inconel 625 20-23 5 max. 8-10 - - - Nb3.15-4.15 58 min.
Incoloy 800 19-23 39.5 min. - 0.15-0.6 0.15-0.6 0.1 max. - 30-35
Incoloy 800HT 19-23 39.5 min. - 0.15-0.6 0.15-0.6 0.06-0.1 - 30-35
Hastelloy X 20.5-23 17-20 8-10 - - 0.05-0.15 W 0.2-1Co 0.5-2.5 30-35


Properties of some Non-heat-treatable nickel-chromium-iron alloys

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non-heat-treatable_nickel-chromium-iron_alloys.txt · Last modified: 2023/12/13 by dmitri_kopeliovich
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