Hastelloy is a type of nickel-based alloy, currently mainly divided into Series B, C, and G. It is primarily used in environments where ferritic Cr-Ni or Cr-Ni-Mo stainless steel and non-metallic materials cannot be used, due to their high corrosion resistance. It has been widely applied in various fields abroad, including oil, chemical, and environmental protection industries.

Hastelloy exhibits exceptional mechanical properties, characterized by high strength and toughness, which makes it somewhat challenging to machine. It also has a strong strain-hardening tendency; at a deformation rate of 15%, it is approximately twice that of 18-8 stainless steel. Hastelloy also features a medium-temperature sensitization zone, with its sensitization tendency increasing with the deformation rate. At higher temperatures, Hastelloy is prone to absorbing harmful elements, which can degrade its mechanical and corrosion-resistant properties.