Chemical Industry

Industry Details

Nickel base alloys used in chemical industry:

Occurrence temperature of crevice corrosion of nickel base alloy

°F°C

Typical 316272.5

AL-6XN11345

Inconel62511345

C-27614060

The high content of Ni and Mo in C-276 alloy makes it have a strong resistance to chloride stress corrosion cracking. The following table shows the stress corrosion cracking tests of four metals in different chloride containing solutions.

Chloride ion stress corrosion cracking test

Test solution Test time (Hours) and test results of bent U-shaped specimen

Typical 316AL-6XN, Inconel625, C-276

42% MgCl2 (boiling) failure (24 hours) and (1000 hours) resistance (1000 hours) resistance (1000 hours)

33% LiCl (boiling) failure (100 hours) resistance (1000 hours) resistance (1000 hours) resistance (1000 hours)

26% NaCl (boiling) failure (300 hours) resistance (1000 hours) resistance (1000 hours) resistance (1000 hours)

Nickel base alloy is an ultra-low carbon type, Ni, Mo, Cr series nickel base, corrosion resistant, high temperature resistant material Hastelloy. Because of its excellent high temperature resistance, oxidation resistance, corrosion resistance in the weld affected zone, good long-term thermal stability and processability, it is used in harsh industrial environments such as agricultural chemicals, nuclear facilities, biological pharmaceuticals, etc. It also has excellent corrosion resistance, uniform corrosion resistance and intergranular corrosion resistance in the media of wet oxygen, sulfurous acid, acetic acid, formic acid and strong oxide salts. Therefore, it is also widely used in the chemical industry. Hastelloy has a much lower conductivity and thermal conductivity than low carbon steel, while its resistivity and expansion rate are much higher than low carbon steel. The molten pool has poor fluidity, poor wettability, small penetration, and shallow melting depth.

Nickel base alloys are suitable for various chemical industries containing oxidizing and reducing media. The higher content of molybdenum and chromium makes the alloy resistant to chloride ion corrosion, and tungsten further improves the corrosion resistance. At the same time, C-276 Hastelloy tube is one of the only materials resistant to the corrosion of humid chlorine, hypochlorite and chlorine dioxide solution, and has significant corrosion resistance to high concentration chloride solutions such as ferric chloride and copper chloride.

The company is mainly engaged in the development and production of high-quality corrosion resistance and high temperature resistance. The company's experts and technicians provide further customer service and technical support worldwide. The company's service center and branches can provide customers with plates, bars, pipes, forgings, flanges and connectors in a timely manner.

Nickel base alloys have excellent corrosion resistance in various reducing media, and can withstand the corrosion of hydrochloric acid at any temperature and concentration under normal pressure. It has excellent corrosion resistance in non aerated medium concentration non oxidizing sulfuric acid, various concentrations of phosphoric acid, high-temperature acetic acid, formic acid and other organic acids, bromic acid and hydrogen chloride gas, and it is also resistant to the corrosion of halogen catalysts. Therefore, nickel based alloys are usually used in a variety of harsh petroleum and chemical processes, such as the distillation and concentration of hydrochloric acid; It is one of the most corrosion resistant modern metal materials.