Alloy C22 • UNS N06022

Alloy C22, is a versatile austenitic nickel-chromium-molybdenumtungsten alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. This nickel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions.

Alloy C22 has resistance to oxidizing acid chlorides, wet chlorine, formic and acetic acids, ferric and cupric chlorides, sea water, brine and many mixed or contaminated chemical solutions, both organic and inorganic. This nickel alloy also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. This is beneficial in multi-purpose plants where such “upset” conditions occur frequently.

Available tube product forms

Typical Applications

  • Processing Equipment
  • Heat Exchangers
  • Hydraulic systems
  • Vessels

Typical manufacturing specifications

  • ASTM B622
  • ASTM B626
  • Also individual customer specifications.

Industries predominantly using this grade            

Technical Data

Mechanical Properties

Temper Annealed
Tensile Rm 111 ksi (min)
Tensile Rm 765 MPa (min)
R.p. 0.2% Yield 52 ksi (min)
R.p. 0.2% Yield 359 MPa (min)
Elongation (2” or 4D gl) 25 % (min)


Physical Properties (Room Temperature)

Specific Heat (0-100°C) 414 J.kg-1.°K-1
Thermal Conductivity 10.2 W.m -1.°K-1
Thermal Expansion 6.9 mm/m/°C
Modulus Elasticity 206 GPa
Electrical Resistivity 4.48 μohm/cm
Density 8.69 g/cm3


Chemical Composition (% by weight)

Element Min Max
C 0.17 0.25
Si - 0.4
Mn 0.4 0.7
P - 0.045
S - 0.045
Cr - 0.4
Cu - 0.5
Mo - 0.1
Ni - 0.4
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