UNS N08800, Alloy 800, W.Nr. 1.4876, Incoloy® 800
Note that the designation “ Incoloy®” is registered trademarks of the Special Metals Corporation group of companies. 

UNS N08800 is a nickel-based alloy designed for corrosion and high temperature environments. Due to the content of nickel, the alloy resists stress corrosion cracking, and maintains a ductile, austenitic structure. The chromium in the alloy imparts both aqueous and heat resistance. Iron provides resistance to internal oxidation.  In addition, the alloy is readily formed, welded, and machined. These properties make incoloy 800 widely used material for construction of equipment requiring corrosion resistance, heat resistance, strength, and stability for service up to 1500°F (816°C).

Incoloy 800, 800H and 800HT have the same nickel, chromium, and iron contents and generally display similar corrosion resistance. Same as many austenitic stainless steels, Incoloy 800 can be sensitized, or made susceptible to intergranular attack in some aggressive media, by exposure to the temperature range of 1000 to 1400°F (540–760°C). When Incoloy 800 is exposed to heat from welding or other operations, care should be taken to avoid sensitization if the material is to be pickled or subjected to other aggressive environments. Sensitization is not a problem in most high-temperature applications.  

Incoloy 800 is a nickel-iron-chromium alloy known for its excellent resistance to oxidation, carburization, and high-temperature corrosion. Heat treatment can be used to enhance certain properties of Incoloy 800, such as grain size control and stress relief. The common heat treatment processes for Incoloy 800 is annealing, solution treatment and stress relieving. It's important to note that the specific heat treatment parameters may vary depending on the form and condition of the Incoloy 800 material, as well as the desired properties for a particular application. 

Before heating, Incoloy 800 to be heated must be cleaned of oil, paint, grease, shop soil and other foreign substances. When heating, all operations must be performed in a low-sulfur atmosphere. If heating is performed in an open air environment,  It is necessary to use low-sulfur fuel and maintain in a reducing condition in the furnace atmosphere, to prevent excessive oxidation. 

Because of the readiness with which chromium is oxidized into a refractory oxide by air, carbon dioxide or water vapor, Incoloy 800 cannot be bright annealed in the usual industrial annealing furnace, the alloy is normally annealed in box or muffle furnaces using prepared reducing atmospheres. Low-sulfur natural gas burned with a deficiency of air, It produces a thin, adherent, green-black film of oxide on the material, these oxide films and scales can be removed by pickling. Please note, because of Incoloy 800 inherent resistance to chemical attack, specialized pickling procedures are needed.

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