Hastelloy C-22 (UNS N06022 / W.Nr. 2.4602)

By virtue of Hastelloy C-22 (UNS N06022 / W.Nr. 2.4602) contents of chromium, molybdenum, tungsten and controlled iron, this alloy exhibits excellent resistance to both oxidizing and reducing acid environments, as well as those containing mixed acids. It is particularly useful for resistance to pitting and crevice corrosion in acid-halide environments.

Equivalent Grades

Hastelloy C-22NS3308Hastelloy C-22N06022NiCr21Mo14W
Nicrofer 5621hMoW

Chemical Composition, %

Hastelloy C-22≤0.015≤0.08≤0.50≤0.03≤0.0220.0-25.0Bal≤2.5012.5-14.52.5-3.5≤0.352.0-6.0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM B462, ASME SB462, ASTM B564, ASME SB564, DIN 17752/17753/17754, ISO 9723/9724/9725
DIN 17752, ISO 9723
Plate, Sheet and StripASTM B575, ASME SB575, ASTM B906, ASME SB906, DIN 17750, ISO 6208
Pipe and TubeASTM B622, ASME SB622, ASTM B619, ASME SB619, ASTM B626, ASME SB626, ASTM B751, ASME SB751, ASTM B775, ASME SB775, DIN 17751, ISO 6207
Welding ProductAWS A5.14 ERNiCrMo-10, ASME Ⅱ SFA-5.14 ERNiCrMo-10, ASME Ⅸ F-No.43
OthersASTM B366, ASME SB366, DIN17744


  • Excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chloride ions
  • Offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams
  • Exceptional resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, chlorine, hot contaminated solutions (organic and inorganic), formic and acetic acids, acetic anhydride, and seawater and brine solutions
  • Resists the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition.


  • Chemical processing involving acetic acid, acetic anhydride and complex acid mixture
  • Pickling operations
  • Cellophane manufacture
  • Chlorination systems
  • Electro-galvanizing rolls, expansion bellows
  • Flue gas scrubber systems; geothermal wells
  • HF furnace scrubbers
  • Incineration scrubbers
  • Nuclear fuel reprocessing
  • Pesticide production
  • Phosphoric acid production
  • Heat exchangers
  • Selective leaching systems
  • Sulfur dioxide cooling towers
  • Sulphonation systems and weld overlay