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:
Hastelloy C22 possess the following properties:
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.