Hastelloy C22 Pipe
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. It has better overall corrosion resistance than other Ni-Cr-Mo alloys available today, including HASTELLOY C-276 and C-4 alloys and alloy 625.
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.
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 |
Hastelloy c22 pipe dimension
Out diameter 1/8''-18''
Wall thickness Sch5S-XXS
Stanard
Pipe Smls B622
Pipe Welded B619
Tube Smls B622
Tube Welded B626
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 degree F followed by rapid cooling. Annealing can be performed at a temperature range between 2020-2150 degree F followed by a rapid quench. Cooling at an accelerated rate avoids the formation of detrimental phases which form between 1400-1800 degree F. Welding can be done by gas tungsten-arc, gas metal-arc and shielded metal-arc processes.
Applications
C-22 alloy are used for:
• Acetic Acid/Acetic Anhydride
• Acid Etching
• Cellophane Manufacturing
• Chlorination Systems
• Complex Acid Mixtures
• Electro-Galvanizing Rolls
• Expansion Bellows
• Flue Gas Scrubber Systems
• Geothermal Wells
• HF Furnace Scrubbers
• Incineration Scrubber Systems
• Nuclear Fuel Reprocessing
• Pesticide Production
• Phosphoric Acid Production
• Pickling Systems
• Plate Heat Exchangers
• Selective Leaching Systems
• SO2 Cooling Towers
• Sulfonation Systems
• Tubular Heat Exchangers
• Weld Overlay-Valves
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