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Hastelloy C-22


HASTELLOY® C-22

UNS Number N06022

Other common names: Alloy C22

Hastelloy C-22Hastelloy 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. 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.

 

Alloy C-22 PlateIn what forms is Hastelloy C22 Available?

Sheet 
Plate 
Bar 
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) 
Wire 
 

characteristics of Hastelloy C22?

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
.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        

 

In what applications is Hastelloy C22 used?

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 
 

Fabrication of Hastelloy C-22

Although ductile enough to be formed by cold working, intermediate annealing may be necessary due to work hardening. Forging should be performed between 1750-2050° F followed by rapid cooling. Annealing can be performed at a temperature range between 2020-2150° F followed by a rapid quench. Cooling at an accelerated rate avoids the formation of detrimental phases which form between 1400-1800° F. Welding can be done by gas tungsten-arc, gas metal-arc and shielded metal-arc processes.

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”-1.75”) 112 53 62 89
Sheet (.038”-.15”) 122 63 54 93
Bar (.50”-5.50”) 115 55 60 89