Material

Alloy C22 / Hastelloy C22

Hastelloy C22, also known as Alloy C22, is a superalloy of nickel-chromium-molybdenum with a chemical composition of nickel 56%, chromium 22% & molybdenum 13% along with a substantial amount of iron, cobalt & tungsten. Hastelloy C22 has the widest corrosion resistance & is the most widely used alloy for corrosion media.

Hastelloy C22 has excellent corrosion resistance to:

  • Variety of chloride compounds & chlorine contaminated material
  • Strong oxidizing chloride solutions such as wet chlorine & hydrochloride & sodium hypochlorite solutions
  • Concentrated hydrochloric, sulfuric & phosphoric acids.

 

Hastelloy C22 possess the following properties:

  • Hastelloy C22 is one of the most resistant metals which offers resistance to oxidizing & reducing environments, along with chlorine induced localized corrosion.
  • At elevated temperatures, Alloy C22 offers good resistance for reactions like sulfidation, oxidation & carburization.
  • It offers the possibility to cold work for higher strength levels.

 

Chemical Composition:

Element Percentage
Chromium ( Cr ) 20% -22.5%
Molybdenum ( Mo ) 12.5% - 14.5%
Tungsten ( W ) 2.5% - 3.5%
Cobalt ( Co ) 2% - 6%
Iron ( Fe ) 0.08%
Other:
Manganese ( Mn ) 0.5%
Vanadium ( V ) 0.35%
Silicon ( Si ) 0.08%
Phosphorous ( P ) 0.02%
Sulphur ( S ) 0.02%
Carbon ( C ) 0.015%

Corrosion Rating:

RATINGS - 0:Unsuitable 1:Poor to Fair 2:Fair 3:Fair to good 4:Good 5:Good to Excellent 6:Normally Excellent

Materials Non-oxidizing or reducing media Liquids Gases
Acid solutions excluding Hydrochloric, phosphoric, sulfuric Neutral solutions, e.g. many Non-oxidizing salt solutions, chlorides, sulfates Alkaline solutions Oxidizing Media Halogen & derivatives
Caustic & mild alkalis, excluding ammonium hydroxide Ammonium hydroxide & amines Acid solutions, e.g. nitric Neutral or alkaline solutions e.g. per sulfates, peroxides, chromates Pitting media, acid ferric chloride solutions Halogen Hydrogen halides, dry, e.g., dry, hydrogen chloride
Moist, e.g. chlorine below dew point Dry, e.g. fluorine above dew point
Alloy C22 5 6 5 6 4 6 5 5 4 4

Note: Maximum Design Temperature shall depend on the corresponding pressure requirement.

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