HASTELLOY C-22 Alloy

HASTELLOY C-22 alloy

Enhanced versatility and exceptional resistance to chloride-induced pitting HASTELLOY C-22 alloy (UNS N06022) is one of the well-known and well-proven nickelchromium-molybdenum materials, the chief attributes of which are resistance to both oxidizing and non-oxidizing chemicals, and protection from pitting, crevice attack, and stress corrosion cracking. Its high chromium content provides much higher resistance to oxidizing media than the family standard, C-276 alloy, and imparts exceptional resistance to chloride-induced pitting, an insidious and unpredictable form of attack, to which the stainless steels are prone.

Like other nickel alloys, HASTELLOY C-22 alloy is very ductile, exhibits excellent weldability, and is easily fabricated into industrial components. It is available in the form of plates, sheets, strips, billets, bars, wires, pipes, tubes, and covered electrodes. Typical chemical

process industry (CPI) applications include reactors, heat exchangers, and columns. 

“Hastelloy” is a trademarked name that’s used for about 20 different high-performance nickel-based alloys. Like most metals, there are various grades or alloys of Hastelloy that each have slightly different properties. 

Common grades of Hastelloy include: C-276, C-22, C-2000, B-2, and X.

Hastelloy C-276 is the most commonly used alloy. Hastelloy C-276 is one of the only materials that can resist the corrosion of wet chlorine gas, hypochlorite, and chlorine dioxide solution, making it suitable for chemical processing parts.

Hastelloy C-22 has better overall corrosion resistance compared to other alloys. It can withstand a range of chemicals and acids, making it useable in chemical and petrochemical applications. 

Hastelloy C-2000 is an alloy that adds a small amount of copper. This combination makes it resistant to various chemicals and acids. 

Hastelloy B-2 is an alloy with lower carbon and silicon content, making it good for welding. B-2 can also be machined- usually after being annealed. It has a wide range of uses in the  chemistry, petrochemicals, energy manufacturing, and pollution control industries.

Hastelloy X is an alloy with excellent high temperature strength and oxidation resistance. This is most commonly used in gas turbine engines because of its high heat tolerance. 

Benefits of Hastelloy

Hastelloy, and most Nickel-based alloys, are more expensive and more difficult to machine.  This makes Hastelloy parts less common, and almost never in consumer products.

Hastelloy parts are highly corrosion resistant, and can handle high heat, harsh chemicals, acidity, and tough working conditions. The industries that commonly use Hastelloy parts are Aerospace, chemical processing, and the pharmaceutical industry. 

Even though Hastelloy parts are significantly more expensive compared to stainless steel, they can tolerate harsh chemicals and high heat exposure for longer periods of time.  

Machining Hastelloy parts

Hastelloy is a less common metal used for CNC machining projects. Even though it takes more effort to machine precision Hastelloy parts, CNC machining with the right tools and experience still offers great precision. 

Spex machines precision custom Hastelloy parts, including:

Fittings

Connectors

Pipe Fittings

Ferrules

Stems

Outlets

Pins

Inlets

Manifolds

Sleeves