Monel is a kind of corrosion resistant alloy with large dosage, wide use and excellent comprehensive performance. The alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, and also has excellent corrosion resistance in hot concentrated alkaline solution. It is also resistant to corrosion of neutral solution, water, sea water, atmosphere and organic compounds. One of the most important characteristics of the alloy is that stress corrosion cracks do not occur in general, and the cutting performance is good. The structure of Monel alloy is single phase solid solution with high strength.

Hastelloy C-276 alloy belongs to nickel - mo - Cr - iron - tungsten nickel-based alloy. It is one of the most corrosion-resistant modern metal materials. Mainly resistant to wet chlorine, all kinds of oxidizing chloride, chloride salt solution, sulfuric acid and oxidizing salt, in low temperature and medium temperature 1 have good corrosion resistance. Therefore, in the past 30 years, in harsh corrosive environment, such as chemical, petrochemical, flue gas desulfurization, pulp and paper, environmental protection and other industrial fields have a quite wide range of applications. The corrosion data of Hastelloy C-276 alloy are typical, but cannot be used as a standard, especially in unknown environment, the selection of materials must be tested. There is not enough Cr in Hastelloy C-276 alloy to resist corrosion in strong oxidizing environments such as hot 1. The alloy is mainly produced for chemical process environment, especially in the presence of mixed acid, such as flue gas desulfurization system discharge pipe.

Hastelloy is a nickel molybdenum chromium superalloy that has tungsten added into the composition. It is very much resistant to pitting corrosion and crevice corrosion. The material composition also makes the pipes very stronger. The pipes are used mostly in chemical processing applications.

800HT can withstand many corrosive media. Its high nickel content makes it have good resistance to stress corrosion cracking under water corrosion condition. High chromium content makes it better resistant to spot corrosion and crack corrosion. The alloy has good resistance to organic acids, but limited resistance to hydrochloric acid. Excellent corrosion resistance in oxidizing and non-oxidizing salts, in addition to the possibility of spot corrosion in halides. It also has good corrosion resistance in water, steam and a mixture of steam, air and carbon dioxide.

Incoloy is suitable for all concentrations of sulphuric acid at low temperatures; In 50% ~ 70% concentration of caustic alkali solution (such as NaOH), it has good corrosion resistance and does not produce stress corrosion cracking. Inconel is suitable for various solutions and acids containing Cl -, and many media such as caustic alkali with concentration < 70%.