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Hastelloy C 22

Hastelloy C-22 is a nickel-chromium-molybdenum alloy with improved pitting, crevice corrosion, and stress corrosion cracking resistance. It resists the formation of grain boundary precipitates in the weld heat affected zone, making it suitable for use as-welded.

Because of its resistance to reducing and oxidising media, C-22 can be used in environments where "upset" conditions are likely. It has excellent weldability and corrosion resistance as consumable filler wires and electrodes. The alloy has shown success as a filler wire in numerous applications.

when other corrosion-resistant wires have failed.Because of its ductility, C-22 is easily cold-formed. Because the alloy is stiffer than austenitic stainless steel, more energy is needed. Olsen cup depth of 0.49" in 0.28" thick, 2050° F heat-treated, rapid quenched sheet.

Chemical Analysis :

The chemical composition nickel Hastelloy C 22 is outlined in the following table.

- Ni Cr Mn C Mo Si Fe
Max Bal 22.5 0.50 0.015 14.5 0.08 6.0
Min - 20.0 - - 12.5 - 2.0

Mechanical Properties :

- Ultimate Tensile Yield Strength (0.2% OS) Elong. in 2 in. (50.8mm) or 4D min., % R/A Hardness
Min 100 KSi 45 KSi 45
Min 690 MPa 310 MPa


  • Digesters and bleach plants in the paper industry.
  • Components exposed to sour gas.
  • Equipment for flue-gas desulfurisation plants.
  • Evaporators, heat exchangers, filters and mixers used in sulfuric acid environments.
  • Sulfuric acid reactors.
  • Organic chloride process equipment.
  • Equipment for processes utilizing halide or acid catalysts.
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