Materials · Hastelloy
Hastelloy C22 fasteners
HAGUE FASTENERS makes Hastelloy C22 fasteners to order: bolts, studs, nuts and machined parts in Hastelloy C22, the nickel-chromium-molybdenum-tungsten alloy for the harshest mixed chemical duty, made to your drawing in Willenhall.
UNS N06022
Also Alloy 22 and DIN 2.4602
20 to 22.5% Cr
Chromium for oxidising media
765 MPa
Typical tensile strength, solution treated
1 to 500
Prototypes to batches of several hundred
About the alloy
For oxidising and reducing chemicals alike
HAGUE FASTENERS makes Hastelloy C22 fasteners in the UK for chemical plant where the process swings between oxidising and reducing conditions. With more chromium than C276, plus molybdenum and tungsten, C22 resists strong oxidisers such as ferric and cupric chlorides and chlorine, as well as hot contaminated acids, seawater and brine.
It also resists grain boundary precipitates in the weld heat-affected zone, so it suits most chemical process duty in the as-welded condition. It machines like other high-nickel alloys: it work-hardens quickly, and rewards the right tooling and thread form.
At a glance
- Nickel-chromium-molybdenum-tungsten alloy
- Resists pitting, crevice corrosion and stress corrosion cracking
- For mixed acids and contaminated process streams
- Suitable as welded for most process duty
Composition
Hastelloy C22 chemical composition
Percentage by weight. Other elements: V 0.35 max.
| Element | Min % | Max % |
|---|---|---|
| Nickel (Ni) | Bal. | – |
| Chromium (Cr) | 20.00 | 22.50 |
| Molybdenum (Mo) | 12.50 | 14.50 |
| Manganese (Mn) | – | 0.50 |
| Iron (Fe) | 2.00 | 6.00 |
| Silicon (Si) | – | 0.08 |
| Carbon (C) | – | 0.010 |
| Phosphorus (P) | – | 0.02 |
| Sulphur (S) | – | 0.02 |
| Cobalt (Co) | – | 2.50 |
| Tungsten (W) | 2.50 | 3.50 |
Properties
Mechanical properties (typical, solution treated)
Typical values in the solution treated condition.
| Property | Value |
|---|---|
| Tensile strength | 765 MPa |
| Yield strength (0.2% offset) | 358 MPa |
| Elongation in 2 in (50 mm) or 4D | 20% |
This data is for general information only and may change without notice. HAGUE FASTENERS LIMITED believes it to be accurate but gives no warranty as to its accuracy or completeness and accepts no liability for its use. Actual properties may vary, and nothing here guarantees suitability for a particular use.
Equivalents and applications
Hastelloy C22 equivalents and typical uses
Alternative designations
Hastelloy C22, Alloy 22, UNS N06022, ASTM B366, ASTM B564, ASTM B574, ASTM B575, ASTM B619, ASTM B622, DIN 2.4602.
Typical applications
- Chemical and petrochemical process plant
- Ferric and cupric chloride service
- Chlorine and hot contaminated solutions
- Formic and acetic acids, acetic anhydride
- Seawater and brine
- Flue gas desulphurisation
What we make
Fasteners we make in Hastelloy C22
Certification and testing
Certified, traceable and tested
Bar comes from approved UK, EU or US mills, with heat numbers carried through to release. Testing is by independent UKAS-accredited laboratories, with EN 10204 3.1 or 3.2 certificates as required. See quality and testing.
- Mill certificates and heat traceability
- PMI and chemical analysis
- Solution annealing by approved partners, with furnace charts
- Laser-marked heat codes or part numbers
Questions
Frequently asked questions
What is the equivalent of Hastelloy C22?
Hastelloy C22 is UNS N06022 and DIN 2.4602, also called Alloy 22. Bar and forgings are supplied to standards including ASTM B574 and ASTM B564.
Is Hastelloy C22 better than C276?
C22 is usually preferred for oxidising and mixed media because of its higher chromium. C276 remains the more common all-round choice. We can advise on your duty.
Where are Hastelloy C22 fasteners used?
Hastelloy C22 fasteners are used in chemical process plant, scrubbers, and seawater and brine service where stainless steels would pit or crack. See chemical industry fasteners.
Can you make Hastelloy C22 bolts in small quantities?
Yes. We make single prototypes and breakdown replacements as well as batches of several hundred.
Hastelloy C22 enquiry?
Send us your drawing or specification
Tell us the sizes, quantity and documentation you need, and we will reply quickly.