Hastelloy C22 Tube Sheet
Higher chromium than C276, giving improved resistance in certain oxidizing conditions (notably wet chlorine and ferric/cupric chloride) plus better as-welded corrosion resistance without post-weld heat treatment.
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Nickel (Ni) | Balance | — |
| Chromium (Cr) | 20.0 | 22.5 |
| Molybdenum (Mo) | 12.5 | 14.5 |
| Tungsten (W) | 2.5 | 3.5 |
| Iron (Fe) | 2.0 | 6.0 |
| Carbon (C) | — | 0.015 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 690 MPa min (annealed) |
| Yield Strength (0.2% offset) | 310 MPa min (annealed) |
| Elongation | 45% min |
| Max. Practical Service Temp. | ~550°C |
Equivalent Grades
| Standard | Designation |
|---|---|
| ASTM / UNS | N06022 |
| EN / DIN | 2.4602 |
| Trade Name | Hastelloy® C-22 (Haynes International) |
C22 vs. C276 — Which One
See the full Hastelloy C276 datasheet for the broader-spectrum alternative.
Applications
Chlorine dioxide bleach plants, wet chlorine processing, ferric and cupric chloride etching solutions, and pharmaceutical processes with aggressive cleaning agents where welded fabrication without PWHT is required.
Advantages & Limitations
Advantages
- Superior as-welded resistance vs. C276, no PWHT required
- Better resistance to wet chlorine and oxidizing chloride solutions
- Excellent resistance to pitting and crevice corrosion
Limitations
- Similar high cost to C276
- Slow, tool-intensive machining
- C276 may be preferred for broader mixed-acid resistance
FAQ
Not exactly an upgrade — the two are optimized for slightly different conditions. C22's higher chromium gives it an edge in wet chlorine and certain oxidizing chloride solutions, while C276 has a longer track record across a broader range of reducing acid conditions.
No — C22's low carbon and high chromium content give it good as-welded corrosion resistance without requiring PWHT, which is one of its key practical advantages over some other corrosion-resistant alloys.
Similar to C276 — typically sourced to order given specialist demand. Send your specification and quantity for a confirmed schedule.