Hastelloy C22 Products — Hastelloy C-22

Product Overview

Reviewed and maintained by the Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd.

Hastelloy C22 Products — Hastelloy C-22 镍合金产品

If your process mixes oxidising and reducing acids — nitric with hydrochloric, or wet chlorine with sulfuric — Hastelloy C22 (UNS N06022) is the upgrade over C276 you want. Its higher chromium and tungsten give it better resistance to oxidising media and a wider safe envelope across acid combinations, while keeping C276's weldability without post-weld heat treatment. We stock tube, plate, bar, fittings and flange in Baoji with full MTC. This guide covers where C22 beats C276, which ASTM fits each form, where it still fails, and how to RFQ it.

The reason a product guide beats a catalogue is simple: the seven nickel families (tube, plate, bar, wire, fittings, flange, fasteners) are not independent. A corrosive line is plate shells, tube bundles, bar-made shafts and fittings from one grade system — specifying them consistently is what keeps a plant leak-free for decades. Below, this alloy gets its own section, then the shared failure map and one selection rule. For the other alloys see our nickel alloy nickel alloy hub.

At a Glance: Hastelloy C22 Products

1. What Hastelloy C-22 镍合金产品 Actually Is (and Why Buyers Confuse It)

Hastelloy C22 is a low-carbon nickel-chromium-molybdenum-tungsten alloy (about 56% nickel, 22% chromium, 13% molybdenum, 3% tungsten). Compared with C276 it carries more chromium and tungsten, which is exactly what lifts its resistance to oxidising acids and to combinations of oxidising and reducing species. Like C276 it welds without post-weld heat treatment thanks to its low carbon. We plan tube, fittings and flange from one grade system.

2. Grade Quick-Reference — Hastelloy C22 (N06022)

For the full nickel-family picture — Inconel, Hastelloy, Monel, Incoloy, Alloy 20 side by side — see our alloy matrix alloy fabrication matrix. If you also run titanium lines, our titanium titanium guide explains where each metal owns the service.

3. How to Read a Hastelloy C22 Products RFQ

A usable quote starts with a usable request. Put these on the enquiry so we return price and lead time instead of questions:

• Grade — C22 (confirm vs C276 with the service).
• Spec — B622 (tube), B575 (plate), B574 (bar), B366 (fittings), B564 (flange).
• Size — OD / thickness / length / diameter, quantity.
• Condition — solution-annealed; tolerance class.
• Ends — plain, bevelled, or forged flange.
• Certificate — EN 10204 3.1 MTC with heat number.
• Service — medium, concentration, temperature, oxidising vs reducing.
• Packing — VCI, crate, port.

4. Hastelloy C22 Products Forms, Sizes & What to Specify

5. Standard & Certification You Receive

Each lot ships with an EN 10204 3.1 mill test certificate, heat-number traceable to the melt, to ASTM B575/B622/B574 as applicable. Condition is solution-annealed, and PMI or UT can be added on the order. For fabrications we kit the matching fittings and flange from one shipment.

6. The “One Alloy Solves Everything” Myth

C22 is not “always better” — for straight reducing acid (pure HCl, de-aerated H2SO4) C276 is comparable and often cheaper; C22 earns its premium in oxidising and mixed acid. For pure seawater strength, Inconel 625 may do; for mild duty, titanium. Pay for C22 only where the oxidiser is real.

7. Where Hastelloy C22 Products DOES Fail — Limitation & Failure Conditions

C22 limits are close to C276 but shifted toward oxidising tolerance; it still fails in the most aggressive oxidisers and in fluoride. Read the shared high-nickel failure map, then the alloy-specific notes.

Two joint-specific notes. Pick the gasket for the actual medium, and avoid coupling the nickel alloy directly to a much nobler metal (graphite, platinum, passive titanium in oxidising service) without isolation — it can become the anode. Where the service is oxidising or mixed acid, step to Hastelloy C-276 or C-22 rather than pushing the alloy past its limit.

8. Choose by Service, Not by Habit

Choose this if:

• Mixed oxidising + reducing acid (HNO3 + HCl) → C22.
• Wet chlorine / hypochlorite with acid → C22.
• Where C276 is borderline in oxidiser → C22.

Choose that if:

• Straight reducing acid, cost-sensitive → Hastelloy C-276.
• Seawater + high strength → Inconel 625.
• Mild duty → titanium / 316L.
• Fluorine / HF → Monel 400, not C22.

9. Common Procurement Mistakes

• Assuming C22 beats C276 everywhere — in pure reducing acid it is comparable and costlier.
• Using C22 for mild duty — waste; use titanium/316L.
• Wrong filler (must be ERNiCrMo-22).
• No MTC on a pressure part.

10. Lead Time, MOQ & Export Packing

C22 is held in Baoji across tube, plate, bar, fittings and flange, cut to size and dispatched fast for standard sizes. Heavy-wall tube, large forged flange or special tempers lead a few weeks. Small MOQ applies — a single spool, one plate or a set of flanges is a normal order, and we kit the whole line from one shipment.

11. Alloy vs the Alternatives — When NOT to Specify This Alloy

12. Welding & Joining Note

These nickel alloys weld readily by GTAW / GMAW / SMAW, but the stubborn oxide must be cleaned first or fusion fails, and welding wire must be kept dry to avoid porosity. For this family specify filler ERNiCrMo-22, weldable without post-weld heat treatment; follow a qualified WPS with argon back-purge on tube and pipe, and we supply the matching wire and forming notes so the weld stays in grade. Always confirm the filler matches the base grade on the RFQ.

13. Reading the Mill Test Certificate

Every lot ships with an EN 10204 3.1 EN 10204 3.1 MTC: grade and UNS, heat number, chemistry, tensile result, and the ASTM specification. Keep the heat number — it is your traceability link from the finished part back to the melt, and it is what lets an auditor confirm the grade years later. For project work ask for PMI or UT on the order so the certificate matches the actual piece.

14. Why a Baoji Titanium-Valley Stockist

We hold nickel alloys and titanium together in Baoji Baoji, close to China’s Titanium Valley supply base, which means we can cut, forge and kit a mixed line from one shipment instead of chasing several mills. That shortens lead time from mill-weeks to days and keeps one grade logic, one certificate pack, and one point of contact for your whole order. Our nickel buying guide explains the stock-holder model for overseas buyers.

15. A 5-Minute RFQ Template

Copy this into your enquiry and fill the blanks — it returns a quote, not a guessing game:

• Product: Hastelloy C22 Products, grade ___
• Spec: ___ (ASTM / ASME)
• Size: ___ ; quantity ___
• Condition / finish: ___
• Certificate: EN 10204 3.1, UT/PMT if needed
• Service: medium ___, concentration ___, temperature ___, pressure ___
• Destination & packing: port ___, VCI / crate

Email it to [email protected] — we confirm stock and pricing within 24 hours, and can kit the whole line from one Baoji shipment so grade and certificate stay consistent end to end.

16. FAQ — Hastelloy C22 Products

When does C22 beat C276?

C22 resists oxidising acids and combinations of oxidising and reducing species better than C276 because of its higher chromium and tungsten. For straight reducing acid the two are comparable, so C22 pays off when oxidisers are present.

Does C22 resist wet chlorine and hypochlorite?

Yes. C22 handles wet chlorine and hypochlorite service well, which is why it is common in scrubbers and bleach plants.

What ASTM applies to C22 plate versus tube?

B575 for plate, B622 for seamless tube (B619 for welded), B574 for bar, B366 for fittings and B564 for forged flange.

Why pick C22 over C276 for a nitric-plus-hydrochloric line?

The nitric makes the medium oxidising; C22's extra chromium and tungsten keep it in its safe envelope where C276 can be borderline.

What welding filler and heat treatment?

Use ERNiCrMo-22; C22 welds without post-weld heat treatment thanks to its low carbon, but clean the oxide and keep wire dry.

What certificate comes with the order?

EN 10204 3.1 MTC, heat-number traceable to the melt, to the relevant ASTM grade; PMI/UT on request.

Do you export worldwide?

Yes. Baoji stock to global ports, with VCI protection, crating and full MTC and shipping documents.

Summary: One Rule Beats a Catalogue

If you take one thing from this guide, take this: specify the alloy for the fluid, not just the word “nickel alloy,” and treat every joint as a system. Hastelloy C22 Products is the right call for its service window — and never specify it where the limitation map says no. Send the checklist above to [email protected] or use the inquiry form — we confirm stock and pricing within 24 hours, and can kit plate, tube, bar, wire, fittings, flange and fasteners for your whole line from one Baoji shipment.