Hastelloy C22 (UNS N06022) is a versatile nickel-chromium-molybdenum-tungsten alloy with enhanced resistance to corrosion and its tolerances make it suitable for a wide variety of applications. It is a solid-solution duplex alloy having excellent resistance to thermal shock and pitting. Because of its wide range of usage, the alloy is commonly referred to as the workhorse alloy in industry.
Hastelloy C22 (UNS N0106022) is an alloy of nickel, chromium, molybdenum, tungsten, manganese, iron and cobalt, with a maximum allowable carbon content of 0.2%. This composition happens to provide extremely versatile corrosion resistance characteristics, owing to a combination of passive film forms and active chemical inhibition. Because of its chromium content, the alloy displays excellent resistance to pitting and crevice corrosion, even its heavily sensitized state. It also performs outstandingly well in oxidation and reduction conditions, sulfuric acid, hydrochloric acid, phosphoric acid, and formic acid. The alloy further demonstrates tough resistance to localized attack such as intergranular corrosion and stress corrosion cracking. Finally, Hastelloy C22 is commonly chosen in favor of materials such as stainless steel when utilized in higher temperature, higher pressure, and more corrosive environment, as this alloy is well known for its superior service life and reliability.
Hastelloy C22 is often utilized in extreme temperature and pressure applications, such as in the production of corrosion-resistant equipment and components in a variety of areas including, chemical processing, pulp and paper production, oil and gas refining, mining and mineral processing, medical and pharmaceutical applications and aerospace components. It is also extensively used in heat exchangers, valves, pressure and vacuum vessels, pumps, nuclear waste disposal, coal conversion plants and more.
Hastelloy C22 can be machined to yield components with superior surface finishes and generous dimensional tolerances. Even though its slightly trickier to work with than other alloys like stainless steel, it can still be machined, ground and polished relatively easily. Its weldable with all popular welding methods, although it can be difficult when welding on heavy sections. Its cold formability is limited, but it can be hot formed. It is also not recommended for hammer forging.
Hastelloy C22 comes in a variety of forms such as plate, sheet, bar, tube and fittings, so it can be acquired to meet any fabrication requirement. The alloy is available in annealed, solution-annealed and quench-hardened conditions. It also has a wide range of standardized finishes including, cresametal, special emissive, duplex and topcoat finishes.
Hastelloy C22 is in high demand in industrial and manufacturing circles around the world. Its superior corrosion resistance and robust physical properties make it a first-choice material in extreme environments. The alloy is well-suited to nuclear applications and its superior performance in chloride-containing media a very attractive choice compared to its stainless steel counterparts. It is a reliable and economical solution to many industry needs.
