HASTELLOY® C 22 – W. Nr. 2.4602 / UNS N06022 / ASTM B575, B574, B622
HASTELLOY® C 22
HASTELLOY® C 22 is a nickel-chromium-molybdenum alloy offering exceptional resistance to corrosion in both oxidizing and non-oxidizing environments. Thanks to its high chromium content, it provides superior protection against pitting corrosion, crevice attack, and chloride-induced stress corrosion cracking compared to other alloys in the same family, such as C-276.
This alloy is widely used in aggressive environments including chemical, petrochemical, and nuclear processes, as well as in high-temperature industrial applications. Thanks to its excellent weldability and machinability, it is available in a wide range of formats, including plates, bars, tubes, wires, and flanges.
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Reference standards:
- ASTM B575 (sheets and strips)
- ASTM B574 (bars and wires)
- ASTM B622 (seamless tubes)
- ASME SB-366, SB-462, SB-564
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 56.0 min |
| Chromium (Cr) | 22.0 |
| Molybdenum (Mo) | 13.0 |
| Iron (Fe) | 3.0 |
| Tungsten (W) | 3.0 |
| Cobalt (Co) | 2.5 max |
| Manganese (Mn) | 0.5 max |
| Vanadium (V) | 0.35 max |
| Carbon (C) | 0.01 max |
| Silicon (Si) | 0.08 max |
| Copper (Cu) | 0.5 max |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 800 | 407 | 57 |
| 400 | 703 | 303 | 57 |
| 600 | 676 | 286 | 62 |
| 800 | 655 | 283 | 67 |
Heat treatments
- Annealing: 1121°C (2050°F) for 10-30 minutes, followed by rapid water quenching. For thicknesses below 10 mm, rapid air cooling is possible.
- Hot forming: Initial temperature of 1232°C (2250°F) and final temperature of 954°C (1750°F).
- Cold forming: May require multiple stages of working with intermediate annealing.
Available forms
HASTELLOY® C 22 is available in the following forms:
Industrial applications
Thanks to its superior resistance to corrosion and stress corrosion cracking, HASTELLOY® C 22 is used in various industrial sectors:
- Aerospace and Defence: Components for extreme environments.
- Power Generation: Heat exchangers and cooling systems.
- Chemical and Pharmaceutical Industry: Chemical reactors, process plants for aggressive substances.
- Motorsport: High-temperature resistant exhaust systems.
- Nuclear: Structural and containment components for highly corrosive environments.
- Oil & Gas: Subsea pipelines, valves, and fittings for acidic and high-pressure environments.
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