Hastelloy Wire- Ideal for use in highly corrosive environments

Hastelloy Wire is made of various alloys of Hastelloy such as Hastelloy C276 and Hastelloy C22. Hastelloy C276 alloy has excellent corrosion-resistance to both oxidizing and reducing media. It also has excellent resistance to localized corrosion attack. Hastelloy C276 alloy is used in numerous industries as it works in aggressive and corrosive environments. Hastelloy C276 alloy is a versatile corrosion-resistant alloy that doesn’t need to be solution heat-treated after welding and has excellent fabricability. It has resistance to formation of grain boundary precipitates in the weld heat-affected zone that makes it suitable for numerous chemical process applications in the as-welded condition. 

Hastelloy C22 alloy weld filler materials are considered for environments where attack of Hastelloy C276 alloy weld joint is experienced. Hastelloy C276 alloy has excellent resistance to localized corrosion and to oxidizing & reducing media. It is used in environments where “upset” conditions can occur. It is also used in multipurpose plants. It has high resistance to various chemical process environments including strong oxidizers such as ferric and cupric chlorides, chlorine, acetic anhydride, brine solutions, hot contaminated media (organic and inorganic), formic & acetic acids and seawater. It is used in flue gas desulfurization systems due to its high resistance to sulfur compounds and chloride ions encountered in numerous scrubbers. This alloy has high resistance to pitting and stress corrosion cracking. It can withstand the corrosion caused by wet chlorine gas, hypochlorite and chlorine dioxide.

Hastelloy C276 alloy is hot-upset, forged and impact extruded. Although this alloy has a tendency to work-harden, it can be deep-drawn, punched, spun and press-formed. Hastelloy C276 alloy can be welded using common welding methods except the oxyacetylene and submerged arc processes which should not be used when the fabricated item is to be used in corrosive environment. Excessive heat input is avoided by taking special precautions.

In a test of oxidizing NaCl-HCl solution, the solution temperature was varied in 5°C increments to determine the lowest temperature at which pitting corrosion initiated after an exposure of 24 hours in pitting testing and the lowest temperature at which crevice corrosion initiated in an exposure of 100 hours of crevice corrosion testing. The lowest temperature at which pitting corrosion initiated was 150°C and the lowest temperature at which crevice corrosion initiated was 80°C.   

In the crevice-corrosion test with 6% ferric chloride solution, the solution temperature was varied in 2.5°C increments to determine the lowest temperature at which crevice corrosion initiated in an exposure of 24 hours. The lowest temperature at which crevice corrosion initiated was 95°C.

In the pitting corrosion test with oxidizing H2SO4-HCl solution, experiments were performed in increments of solution temperature of 5°C for an exposure of 24 hours to find the critical pitting temperature. The lowest temperature at which pitting corrosion initiated was 110°C.

Additional uses of HastelloyC276 wire include welding the clad side of joints on steels in various industries such as petrochemical, chemical and petroleum. Typical applications of Hastelloy C276 alloy are in marine industries, pickling systems, chlorination systems, chemical processing and nuclear fuel reprocessing.