Zhengzhou Huitong Pipeline Equipment Co.,Ltd. |
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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. 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 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
What are the 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
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.
Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet/Plate | Bar | Forging | Fitting |
B622 | B619 | B622 | B626 | B575 | B574 | B564 | B366 |
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 |
We can provide Hastelloy C22 material in the form of flange, fittings, pipes, fasteners.