Incoloy 800 Characteristic
Incoloy 800/UNS N08800/DIN W.Nr. 1.4876 is a heat and corrosion-resistant alloy with a relatively low nickel content. It is widely used for its strength at high temperatures and its ability to resist oxidation, carburization and other types of high-temperature corrosion, like: petrochemical equipment or components, heating element sheathing, and nuclear steam generator tubing.
Corrosion Resistance for Incoloy 800
Alloy 800, 800H and 800HT have the same nickel, chromium and iron contents and generally display similar corrosion resistance. Alloy 800H and 800HT are used for high-temperature strength, corrosive enviroments to with these alloys are exposed normally involve high-temperature reactions such as oxidation and carburization.
Heating and Pickling
Heating must be performed in a low sulfur atmosphere. Open heating must be done with low sulfur fuel, and the furnace atmosphere must be maintained in a reducing condition to prevent excessive oxidation.
Because of the readiness with which chromium is oxidized into a refractory oxide by air, carbon dioxide or water vapor, alloy 800 series cannot be bright annealed in the usual industrial annealing furnace. Under closely controlled conditions, the alloy can be bright annealed in dry, pure hydrogen(dew point of -58℃/-73℉) or lower, less than 0.004% by volume water, and less than 0.007% by volume air.
