ncoloy800H is resistant to corrosion by many corrosive media. Its high nickel content gives it good resistance to stress corrosion cracking in aqueous corrosion conditions. The high chromium content gives it better resistance to pitting and crevice corrosion cracking. The alloy has good corrosion resistance to nitric acid and organic acid but has limited corrosion resistance to sulfuric acid and hydrochloric acid. In addition to the possibility of pitting corrosion in halides, it has good corrosion resistance in oxidizing and non-oxidizing salts. It also has good corrosion resistance in water, steam, and mixtures of steam, air, and carbon dioxide.
Incoloy800H high-carbon type has a carbon content between 0.05 and 0.10. It is mainly used for temperatures above 600 degrees. It has the characteristics of coarse grains, high creep strength, good mechanical properties, and corrosion resistance. It is used in the chemical industry, Power, superheater, reheater, high-temperature heating, conversion cracking furnace tube, etc. in the petrochemical industry.
Incoloy800H processing and welding: thermal processing performance is good, the thermal processing temperature is 900~1200, and hot bending forming is at 1000~1150 degrees, in order to reduce the intergranular corrosion tendency of the alloy, it should pass through the sensitization zone of 540~760 degrees as quickly as possible. Intermediate softening annealing is required during cold working. The heat treatment temperature is 920~980. The solution temperature is 1150~1205. The welding performance is good, and the conventional welding method is used.
Incoloy800H corresponding grade:
National standard: NS1102, NS112, 0Cr21Ni32AlTi, American standard: Incoloy800H, N08810, German standard: 1.4958, X5NiCrAlTi31-20
Incoloy800H corrosion resistance: the alloy has good corrosion resistance to nitric acid, organic acid, oxidizing, and non-oxidizing salts except halogen salts. Especially high-temperature corrosion resistance, has good carburization resistance, intergranular corrosion will occur when the alloy is heated between 593~816 and has good stress corrosion resistance, but long-term aging at 650 degrees may significantly reduce the stress corrosion sensitivity of the alloy, In NaOH, NACL stress resistance depends on concentration and level. It has good resistance to stress corrosion cracking and has resistance to stress corrosion cracking in hydrochloride, corrosion resistance to steam, air, and carbon dioxide mixture, and good corrosion resistance to organic acids such as nitric acid, formic acid, acetic acid, propionic acid, etc., but After heating, it will cause sensitization and intergranular corrosion. It can only resist the low concentration of sulfur and hydrochloric acid corrosion. It has good corrosion resistance to organic acids and good corrosion resistance to flowing seawater, but deposits will form on the surface of stagnant seawater. And cause severe corrosion cracks.
Incoloy800H application fields: superheater, reheater, high-temperature heating, conversion cracking furnace tube, etc. in the chemical industry, electric power, and petrochemical industry.