Broad-spectrum resistance to the most aggressive acids — see the grade table below for full datasheets and equivalents within this family.
See All Grades ↓Hastelloy alloys combine high molybdenum with nickel and chromium to resist both oxidizing and reducing acid environments — a combination most single-purpose alloys can't match. It's the reach when a process stream's chemistry is variable, mixed, or not fully characterized, and when stainless, duplex, and even Inconel have all fallen short.
C276 has the longest track record across the broadest range of reducing acid conditions; C22 offers improved resistance in certain oxidizing conditions like wet chlorine, plus better as-welded corrosion resistance without post-weld heat treatment.
| Grade | Designation | Best For |
|---|---|---|
| Hastelloy C276 | UNS N10276 | Broad oxidizing/reducing acid mix, longest track record |
| Hastelloy C22 | UNS N06022 | Wet chlorine, ferric/cupric chloride, as-welded service |
It's a reasonable conservative choice, but a proper fluid analysis often reveals that a less expensive targeted material — stainless, duplex, or Monel — is entirely adequate, making Hastelloy unnecessary spend.
C22's higher chromium content gives an edge in wet chlorine and oxidizing chloride solutions plus better as-welded resistance without PWHT; C276 has a longer track record across broader reducing acid conditions.
Given its specialist demand profile, yes — send your specification and quantity for a confirmed lead time rather than assuming standard turnaround.
Every enquiry is checked against governing code, material compatibility and manufacturing feasibility before a quote is issued. Use our product, material, grade and standards guides to freeze the RFQ — then confirm with engineering.
Send your fluid composition and temperature — our engineering team will confirm the right grade.
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