Metinox Overseas is an ISO-certified Hastelloy C22 fittings manufacturer India. We supply UNS N06022 Hastelloy C22 buttweld fittings to the chemical, pharmaceutical, and energy sectors in over 40 countries. All of our fittings come out of our factory with complete material traceability, heat certificates and third party inspection back-up. Available in standard and custom sizes, we have short lead time for elbow, tee, reducer, cap and stub end forms in Hastelloy C22 material that conform to ASTM B366. Our specialized engineering division processes comprehensive custom RFQs within 24 hours, guaranteeing mill-certified traceability for single proto-structural developments or high-volume project infrastructure layouts. Contact our technical sales desk for optimized bulk price per kg commercial structures.
Hastelloy C22 pipe fittings are wrought nickel-chromium-molybdenum-tungsten buttweld fittings made to ASTM B366 / ASME SB366 — UNS designation N06022 — and dimensioned to ASME B16.9 and MSS SP-43. These are solution annealed by Metinox Overseas in sizes from 1/2 NPS to 24 NPS across all standard wall thickness profiles including Schedule 10S, 40S, 80S, and heavy-wall variations for elbows, tees, reducers, caps, stub ends and crosses. All fittings are marked with the weld class designation WPNCC22 and can be purchased either in a seamless or welded construction.
Unlike alternative standard nickel alloys, Hastelloy C22 fittings are specifically designed to withstand environments which have alternating oxidising and reducing conditions. The corrosion resistance to ferric chloride, wet chlorine, nitric acid, and hydrochloric acid is only found in one Hastelloy grade (C22) in one installation.
The following table summarises the key specification parameters for UNS N06022 buttweld pipe fittings as supplied by Metinox Overseas.
| Standard | ASTM B366 / ASME SB366 |
|---|---|
| UNS Designation | N06022 |
| Common Trade Name | Hastelloy C22 / Alloy C22 |
| DIN Equivalent | 2.4602 (NiCr21Mo14W) |
| Product Form | Wrought buttweld fittings (seamless and welded) |
| Heat Treatment | Solution annealed |
| Dimensional Standard | ASME B16.9 / MSS SP-43 |
| Size Range | 1/2 NPS to 24 NPS |
| Weld Class | WPNCC22 |
| Key Advantage | Only Hastelloy grade resistant to both oxidising and reducing environments in same installation |
Get a competitive Hastelloy C22 pipe fittings price per kg India with full mill certification. Bulk and project quantities welcome. Response within 24 hours.
Submit Your RFQ Now| Element | Min % | Max % | Note |
|---|---|---|---|
| Nickel (Ni) | Remainder | — | Balance, approximately 56% |
| Chromium (Cr) | 20.0 | 22.5 | Higher than C276: primary oxidising resistance |
| Molybdenum (Mo) | 12.5 | 14.5 | Lower than C276 but strong reducing resistance |
| Tungsten (W) | 2.5 | 3.5 | Additional pitting and crevice corrosion resistance |
| Iron (Fe) | 2.0 | 6.0 | — |
| Cobalt (Co) | — | 2.5 | — |
| Carbon (C) | — | 0.010 | Ultra-low carbon: prevents sensitisation |
All ASTM B366 Hastelloy C22 fittings from Metinox Overseas are tested to the following minimum mechanical property requirements in the solution-annealed condition. Both SI and imperial units are provided.
| Property | Requirement (SI) | Requirement (Imperial) |
|---|---|---|
| Tensile Strength (min) | 690 MPa | 100 ksi |
| Yield Strength 0.2% (min) | 283 MPa | 41 ksi |
| Elongation (min) | 45% | 45% |
| Standard | Werkstoff Nr. | UNS | JIS | EN |
|---|---|---|---|---|
| Hastelloy C22 | 2.4602 | N06022 | NW 6022 | NiCr21Mo14W |
Use this table to determine which grade suits your process conditions. Cross-reference with our Hastelloy C276 pipe fittings page for full C276 specifications.
| Factor | Hastelloy C22 (N06022) | Hastelloy C276 (N10276) |
|---|---|---|
| Chromium | 20.0 to 22.5% | 14.5 to 16.5% |
| Molybdenum | 12.5 to 14.5% | 15.0 to 17.0% |
| Oxidising acid resistance | Excellent (high Cr) | Moderate |
| Reducing acid resistance | Excellent (high Mo) | Excellent (highest Mo) |
| Mixed/alternating environments | Best choice | Not recommended |
| HCl and H₂SO₄ only | Good | Better (higher Mo) |
| FGD / Pharmaceutical | Preferred | Less versatile |
The Hastelloy C22 oxidising/reducing mixed environment capability opens a uniquely broad application landscape. Key end-use industries and processes include:
For projects requiring complementary fittings in duplex or super duplex grades, explore our Hastelloy pipe fittings hub for other available grades.
Metinox Overseas supplies ASTM B366 UNS N06022 buttweld fittings with 3.1 mill certificates, NACE compliance, and door-to-port logistics worldwide. Send us your drawings or purchase enquiry for a tailored quotation.
Contact Us for an Instant RFQHastelloy C22 (UNS N06022) is a nickel-chromium-molybdenum-tungsten alloy manufactured to ASTM B366. With 20.0 to 22.5% Cr and 12.5 to 14.5% Mo, it provides outstanding resistance to both oxidising and reducing corrosive environments, making it the most versatile grade in the Hastelloy family.
Choose Hastelloy C22 when your process alternates between oxidising and reducing conditions, such as in FGD scrubbers, pharmaceutical CIP systems, or mixed acid environments. C276 is better suited to processes involving purely reducing acids where maximum molybdenum content is needed. For a side-by-side breakdown, see our Hastelloy C276 pipe fittings page.
ASTM B366 / ASME SB366 governs UNS N06022 buttweld pipe fittings with weld class WPNCC22. Dimensional requirements follow ASME B16.9 for standard buttweld fittings and MSS SP-43 for stub ends and lightweight fittings, in sizes from 1/2 NPS to 24 NPS.
C22 has higher chromium (20.0 to 22.5%) for oxidising resistance and moderate molybdenum (12.5 to 14.5%). C276 has lower chromium (14.5 to 16.5%) and higher molybdenum (15.0 to 17.0%) for purely reducing environments. Hastelloy C22 vs C276 selection: C22 for mixed environments, C276 for aggressive HCl and H₂SO₄ only service.
Yes. Hastelloy C22 is the only Hastelloy grade engineered to resist both oxidising and reducing corrosive environments in the same installation. Its balanced Cr-Mo-W chemistry provides resistance to ferric chloride, wet chlorine, nitric acid, and hydrochloric acid simultaneously. Contact Metinox Overseas, your trusted Hastelloy C22 UNS N06022 buttweld fittings manufacturer India for a technical consultation.
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