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Hastelloy C22 Alloy
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Hastelloy C22 Alloy

HASTELLOY® alloys are known throughout the world as the premier corrosion-resistant alloys. These alloys have been used in severe process environments such as those encountered in the chemical process industry, metal pickling facilities, flue gas desulfurization scrubbers, electronics manufacturing, nuclear fuel reprocessing, and in a wide variety of hazardous waste management technologies where high corrosion-resistance of critical equipment is required for reliability, safety, and cost effectiveness/reduced maintenance.

HASTELLOY® C-22® alloy has also been used successfully as scrubber components for hospital waste, municipal waste and spent solvent incineration as well as in a variety of industrial incinerators. Other pollution control technologies which utilize C-22® alloy include critical fluid extraction process equipment, process piping and vessels for waste-water treatment ion exchange resin rejuvenation systems, flue gas desulfurization scrubbers at coal fired utilities (Figure 6), and spent acid reclamation vessels.


These are just a few examples cited where HASTELLOY® C-22® alloy has proven itself technically by solving some severe corrosion and reliability issues in hazardous waste treatment facilities. Due to its exceptional versatility at resisting all forms of corrosion, HASTELLOY® C-22®alloy can handle a wide variety of waste streams which has led to its success at solving equipment problems in this industry.

Nominal Composition (Weight %) :

Alloy Nickel Chromium Molybdenum Tungsten Iron Niobium*
C-22® Balance 22 13 3 3 -
C-276 Balance 16 16 4 5 -
C-4 Balance 16 16 - - -
625 Balance 21.5 9 - 5 3.5

Critical Pitting and Crevice Corrosion Temperatures* :

Alloy 11.5% H2SO4 + 1.2% HCI + 1% FeCl3 + 1% CuCl2 4% NaCl + 0.01M HCI + 0.1% Fe2(SO4)
  24-Hour Pitting Test 100-Hour Crevice Corrosion
C-22® 120°C 101°C
C-276 110°C 80°C
C-4 90°C 45°C
625 75°C 25°C

*The test solution temperature was increased in 5°C increments beginning at room temperature. The temperature sited is the lowest temperature documenting pit or crevice corrosion initiation. Therefore, the higher the temperature the more corrosion resistant the alloy.

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