2024-05-30
Overview of Nickel-Based Corrosion Resistant Alloys
Alloys with nickel as the base, containing more than 50% nickel, having certain high-temperature strength and other comprehensive properties and being able to resist oxidation or water-prone medium corrosion are called nickel-based corrosion-resistant alloys. Correspondingly, corrosion-resistant alloys containing more than 30% nickel and more than 50% nickel and iron are customarily called iron-nickel-based corrosion-resistant alloys.
Domestic grades of nickel-based corrosion-resistant alloys include:
NS111, NS112, NS113, NS131, NS141, NS142,
NS143, NS311, NS314, NS315, NS321, NS322, NS331, NS332,
NS333, NS334, NS335, NS336, NS334, NS341, NS411, etc.
Chemical composition of nickel-based corrosion-resistant alloys
Nickel-based corrosion-resistant alloys are mainly divided into Ni-Cu series, Ni-Mo series, Ni-Fe-Cr series, Ni-Cr-Si series and Ni-Cr-Mo series.
Pure nickel is mainly used in caustic soda working conditions; Ni-Cu system is mainly used in weak reducing solutions, especially hydrofluoric acid; Ni-Mo system is suitable for strong reducing media (hydrochloric acid, medium concentration sulfuric acid, etc.); Ni-Fe-Cr system is mainly used in oxidizing solutions (nitrates and hot concentrated MgCl2, etc.); Ni-Cr-Si system can adapt to super-oxidized media; and Ni-Cr-Mo system is a general-purpose corrosion-resistant material that can adapt to various environments.