Features
Nickel 200 is commercially pure wrought nickel. It is highly resistant to various reducing chemicals and can also be used in oxidizing conditions, where a passive oxide film forms. For example, it has unparalleled resistance to caustic alkalis. Nickel 200 is limited to service at temperatures below 315℃, as it suffers from graphitization at higher temperatures, which severely compromises its properties. In such cases, Nickel 201 is used instead. It has a high Curie temperature and good magnetostrictive properties, with thermal and electrical conductivities higher than other nickel alloys.
Applications
Used in applications where maintaining product purity is critical, such as handling caustic alkalis, foods, and synthetic fibers
Electrical and electronic parts
Aerospace and missile components
Chemical storage and shipping tanks
Features
Nickel 201 is the low-carbon version of Nickel 200. Due to its low carbon content, Nickel 201 is not subject to embrittlement by intergranularly precipitated carbon or graphite when exposed to temperatures of 315 to 760℃ for prolonged periods, as long as carbonaceous materials are not in contact with it. Therefore, it serves as a substitute for Nickel 200 in applications above 315℃. However, it does suffer from intergranular embrittlement by sulfur compounds at temperatures above 315℃, and sodium peroxide can be used to convert these into sulfates to counteract their effects.
Applications
Electronic components
Caustic evaporators
Combustion boats and plater bars