Summary
C-22 and C-276 are the two workhorse Ni-Cr-Mo Hastelloys, and they are easily confused because both carry about 3–4% tungsten. The difference is the balance of chromium and molybdenum. Because molybdenum is a payable element, C-276 scrap carries slightly more molybdenum credit, but the bigger point is to keep them apart so a melter can use them.
Side by Side
| Hastelloy C-22 | Hastelloy C-276 | |
|---|---|---|
| Chromium | About 22% | About 15.5% |
| Molybdenum | About 13% | About 16% |
| Better in | Oxidising media, mixed acids | Reducing acids, wet chlorine |
| Typical service | Pharma reactors, FGD, pickling | FGD, chlorination, pulp bleach, reactors |
Composition Compared
Nominal compositions compared element by element. Change either grade to compare others.
On the XRF
Switch the grade to see how the fingerprint changes. See how XRF sorts nickel alloys.
FAQ
What is the main difference between Hastelloy C-22 and Hastelloy C-276?
Hastelloy C-22 has more chromium (about 22%) and less molybdenum (13%) than C-276 (15.5% Cr, 16% Mo), which makes it better in oxidising conditions. C-276 is the more common grade and is better in strongly reducing acids.
Can Hastelloy C-22 and Hastelloy C-276 scrap be mixed?
No. Keep them separate. A melter buying either one needs its chemistry to stay within the grade’s limits, and mixing can mean a re-sort or a different valuation.