Hastelloy is a kind of nickel based alloy. Nowdays, it is mainly divided into B, C and G series. It is mainly used in iron-based Cr Ni or Cr Ni Mo stainless steel. The mechanical properties of Hastelloy are very outstanding. It has the characteristics of high strength, high toughness and low-corrosive. The working temperature& pressure can reach 500 ℃ and 22MPa or higher.