Hastelloy C22

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Hastelloy C22

Hastelloy C22, also known as alloy C22, is a versatile austenitic nickel-chromium-molybdenum-tungsten 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 steel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. hastelloyc22

Other corrosives Hastelloy C-22 has resistance to are 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.
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.

Alloy C-22 should not be used in service temperatures above 1250° F due to the formation of detrimental phases which form above this temperature.

In what form is Nickel 200/201 Available at Micrometals

  • Sheet
  • Plate
  • Bar
  • Wire
  • Pipe & Tube (welded & seamless)
  • Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)

Chemical Composition, %

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

ASTM Specifications

Pipe Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting
B622 B619 B622 B626 B575 B574 B564 B366

Mechanical Properties

Typical Room Temperature Tensile Properties of Annealed Material

Product Form Tensile (ksi) .2% Yield (ksi) Elongation % Hardness (HRb)
Plate (.25�h-1.75�h) 112 53 62 89
Sheet (.038�h-.15�h) 122 63 54 93
Bar (.50�h-5.50�h) 115 55 60 89