UNS N06022 Hastelloy C-22 Alloy Corrosion Resistant ASTM B622
UNS N06022 is a nickel-chromium-molybdenum alloy renowned for its exceptional resistance to both oxidizing and reducing corrosive media. With a higher chromium content than C-276, plus controlled additions of tungsten, this alloy offers superior resistance to pitting, crevice corrosion, and stress-corrosion cracking in aggressive environments.
UNS N06022 provides outstanding performance in wet chlorine, hydrochloric acid, sulfuric acid, and mixed acid solutions where many other corrosion-resistant alloys fail. It maintains excellent mechanical properties from cryogenic temperatures up to 480°C (900°F) and is readily fabricated using standard industrial methods.
| Parameter | Details |
|---|---|
| Standard | ASTM B622 (Seamless Tube), ASTM B619 (Welded Tube), ASTM B574 (Bar), ASME SB622 |
| Grade / UNS | UNS N06022 |
| Type | Seamless tube / Welded tube (ERW / EFW) |
| Outer Diameter | 6.0 mm – 610 mm (1/8″ – 24″) |
| Wall Thickness | 0.5 mm – 50 mm (SCH 5S – XXS) |
| Length | 6 m / 9 m / 12 m, or random lengths |
| Process | Cold drawn / Cold rolled (seamless); Plate rolled (welded) |
| Finish | Annealed & pickled / Bright annealed |
| Ends | Plain end / Beveled end / Threaded |
| Packaging | Hexagonal bundles + plastic end caps + seaworthy wooden crates or pallets |
| Comparison | UNS N06022 (C-22) | UNS N10276 (C-276) | UNS N06625 (625) |
|---|---|---|---|
| Chromium content | 20-22.5% | 14.5-16.5% | 20-23% |
| Molybdenum content | 12.5-14.5% | 15-17% | 8-10% |
| Oxidizing acid resistance | Best | Moderate | Good |
| Reducing acid resistance | Excellent | Best | Good |
| Pitting resistance | Excellent | Excellent | Good |
| Cost | High | High | Moderate |
| Best application | Mixed acids, wet chlorine | Severe reduction of acids | Seawater, general corrosion |
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