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|
Grade |
Code |
UNS |
Nickel Alloys |
|
C-22 |
Alloy C-22 (2.4602) |
N06022 |
HASTELLOY C-22 / Alloy C-22 is a tungsten-bearing nickel-chromium-molybdenum alloy designed for high corrosion resistance. Alloy C-22 provides strong general corrosion resistance in demanding process environments where oxidizing and reducing chemicals may be present together. Its high chromium content supports performance in oxidizing media, while molybdenum and tungsten improve resistance in chloride-containing and reducing environments. Due to its high resistance to pitting, crevice corrosion and stress corrosion cracking, it is preferred in chemical processing, petrochemical plants, seawater service, waste treatment, flue gas desulfurization and mixed industrial chemical processes.
|
Ni % |
Cr % |
C % |
Mo % |
Mn % |
Si % |
Co % |
V % |
W % |
Fe % |
P % |
S % |
|
Balance |
20.00 – 22.50 |
0.015 max. |
12.50 – 14.50 |
0.50 max. |
0.08 max. |
2.50 max. |
0.35 max. |
2.50 – 3.50 |
2.00 – 6.00 |
0.025 max. |
0.020 max. |
|
Product form |
Rp0.2, MPa |
Rm, MPa |
Elongation, % |
Hardness, HRB |
Density, g/cm³ |
|
Round Bar |
≥310 |
≥690 |
≥45 |
85–100 |
8.7 |
|
Plate / Sheet |
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|
Pipe / Tube |
|
Sector |
Products |
|
Chemical & Petrochemical |
Reactor, heat exchanger, process piping |
|
Pharmaceuticals & Fine Chemicals |
Reaction vessel, mixer part, clean process pipe |
|
FGD / Flue Gas Treatment |
Scrubber part, duct liner, spray nozzle |
|
Waste Treatment |
Waste incineration equipment, acid tank, piping line |
|
Marine & Seawater |
Seawater pipe, pump part, valve part |
|
Pulp & Paper |
Bleaching equipment, chlorine dioxide line, process tank |
|
Power & Nuclear |
Critical pipe, reprocessing equipment, tank/vessel part |
In commercial use, Alloy C-22 is most commonly seen in tank, reactor and scrubber parts fabricated from plate/sheet, seamless or welded pipe-tube systems, and valve, pump, flange and fitting components machined from bar. The main reason for selecting this alloy is that more standard materials such as Alloy 625 or 316L may be insufficient in mixed acids, chloride-containing solutions, combined oxidizing and reducing process media, and equipment exposed to a high risk of localized corrosion.
HASTELLOY C-22 / Alloy C-22 is a highly ductile Ni-Cr-Mo-W alloy that can be readily fabricated from plate, pipe and bar into process equipment. It can be welded by GTAW/TIG, GMAW/MIG and SMAW processes when suitable procedures and filler metals are used. Its low carbon and silicon contents help resist grain-boundary precipitation in the heat-affected zone, making it a reliable choice for chemical process equipment. The alloy is suitable for cold forming; however, because it work-hardens faster than stainless steels, intermediate annealing may be required after heavy deformation. When this behavior is properly managed, C-22 offers a safer and longer-lasting fabrication option compared with C-276, Alloy 625 and standard stainless steels in selected aggressive environments.
HASTELLOY C-22, Alloy C-22, UNS N06022, 2.4602, NiCr21Mo14W
|
Product form |
ASTM |
ASME |
|
Bar / Rod |
ASTM B574 |
ASME SB574 |
|
Plate / Sheet |
ASTM B575 |
ASME SB575 |
|
Seamless Pipe / Tube |
ASTM B622 |
ASME SB622 |
|
Welded Pipe |
ASTM B619 |
ASME SB619 |
|
Welded Tube |
ASTM B626 |
ASME SB626 |
Haynes International — HASTELLOY® C-22® alloy
VDM Metals — VDM® Alloy 22 / Nicrofer 5621 hMoW / 2.4602 / UNS N06022
Special Metals — INCONEL® alloy 22 / UNS N06022
Note: The information provided in this data sheet is for informational purposes only; no liability is accepted.
