Alloy C22

Introduction :

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 C22 Tube Product Form

  • Straight
  • Coiled
  • Seamless
  • Seam welded and cold redrawn
  • Seam welded, cold redrawn and annealed

Typical Applications for Alloy C22

  • Processing Equipment
  • Heat Exchangers
  • Hydraulic systems
  • Vessels

Industries Predominantly Using This Alloy

  • Chemical processing
  • Oil and gas

Typical Manufacturing Specification

  • ASTM B622
  • ASTM B626
  • Also Individual Customer Specifications.

Chemical Composition for Allloy C22

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

Mechanical Properties for Alloy c22

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 for Alloy c22

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

Alloy C22 Avaliability

Alloy C22 Specifications

Alloy C22 Tensile Requirements