hastelloy-c22

Hastelloy® alloy C-22® (UNS N06022) Ni 58, Cr 22, Mo 13.0, Fe 3.0, W 3.0

Hastelloy Alloy C-22 is a nickel-chromium-molybdenum alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. It resists the formation of grain boundary precipitates in the weld-heat affected zone making it suitable for use in the as-welded condition. C-22 has outstanding resistance to both reducing and oxidizing media and because of its resistibility can be used where “upset” conditions are likely to occur.

It is proven to possess excellent weldability and high corrosion resistance as consumable filler wires and electrodes. The alloy has proven results as a filler wire in many applications. As filler wire use when other corrosion resistant wires have failed.This nickel alloy 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.

It has Better corrosion than C-276 in select environments.It’s Resistance to a wide range of organic acids and the resistance to chloride-induced SCC, and other reducing chemicals. Also has resistance to some oxidizing environments.Recommended for welding filler metal for general corrosion resistance in many applications

C-22 has outstanding resistance to both reducing and oxidizing media and because of its resistibility can be used where “upset” conditions are likely to occur.It is proven to possess excellent weldability and high corrosion resistance as consumable filler wires and electrodes. The alloy has proven results as a filler wire in many applications. As filler wire use when other corrosion resistant wires have failed.


Characteristics

  • Resistant to pitting, crevice corrosion and stress corrosion cracking
  • Outstanding resistance to both reducing and oxidizing media
  • Excellent resistance to oxidizing aqueous media
  • Exceptional resistance to a wide variety of chemical process environments including strong oxidizers such as ferric acids, acetic anhydride, and seawater and brine solutions
  • Resists the formation of grain-boundary precipitates in the weld heat-affected zone
  • Excellent weldability


Chemical Composition, %

C
Cr
Co
Fe
Mn
Mo
Ni
P
Si
S
W
V
.010 max
20-22.5
2.5 max
2.0-6.0
.50 max
12.5-14.5
Balance
.02 max
.08 max
02 max
2.5-3.5
35 max


Mechanical Properties

Typical Room Temperature Tensile Properties of Annealed Material

Product Form
Tensile (ksi)
.2% Yield (ksi)
Elongation %
Hardness (HRb)
Plate (.25”-1.75”)
112
53
62
89
Sheet (.038”-.15”)
122
63
54
93


Applications

  • Pharmaceutical industries use alloy C-22 fittings and tubing to avoid contamination caused by corrosion related failures
  • Cellophane manufacturing
  • Chlorination systems
  • Pesticide production
  • Incineration scrubber systems
  • Chemical process industry in equipment like flue gas scrubbers, chlorination systems, sulfur dioxide scrubbers, pulp and paper bleach plants, pickling systems, and nuclear fuel reprocessing
  • Waste water processing

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