Hastelloy C22 Buttweld Fittings are made to ASTM B366 / ASME SB366 WPHC22 (UNS N06022) for oxidising and mixed-acid service. Elbows, tees, reducers and caps are dimensioned to ASME B16.9 and bevelled for welding into Hastelloy C22 pipe.
Raaj Fittings manufactures Hastelloy C22 buttweld fittings in-house at our two plants in India, seamless and welded, from ½" upwards, and exports them to EPC contractors, fabricators and stockists across the Middle East, Europe and the Americas, with full traceability and EN 10204 certificates.
| Material specification | ASTM B366 / ASME SB366 WPHC22 (UNS N06022) |
|---|---|
| Construction | Seamless and welded |
| Dimensional standards | ASME B16.9, MSS SP-43; bevelled ends to ASME B16.25 |
| Size range | ½" to 48" NPS; larger sizes to order |
| Wall thickness | SCH 5S, 10S, 40S, 80S and heavier walls to order |
| Certification | EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request |
Alloy C22 (UNS N06022) is a nickel-chromium-molybdenum-tungsten alloy with higher chromium than C276. That balance gives it excellent resistance to both oxidising and reducing media, and it is often chosen where process streams switch between the two.
| Element, % | N06022 |
|---|---|
| Chromium (Cr) | 20.0 – 22.5 |
| Molybdenum (Mo) | 12.5 – 14.5 |
| Iron (Fe) | 2.0 – 6.0 |
| Tungsten (W) | 2.5 – 3.5 |
| Cobalt (Co) | 2.5 max |
| Carbon (C) | 0.015 max |
| Silicon (Si) | 0.08 max |
| Manganese (Mn) | 0.50 max |
| Vanadium (V) | 0.35 max |
| Nickel (Ni) | Balance |
| Property | Hastelloy C22 |
|---|---|
| Tensile strength, min. | 690 MPa (100 ksi) |
| Yield strength (0.2%), min. | 310 MPa (45 ksi) |
| Elongation, min. | 45% |
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| N06022 | 2.4602 | NiCr21Mo14W | Hastelloy® C-22 |
Hastelloy C22 fittings are formed from pipe, plate or bar and supplied in the solution-annealed condition. Light-wall schedules (5S, 10S, 40S) are common because the alloy's strength and corrosion resistance allow thin walls. Weld with matching nickel alloy filler and low heat input.
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the buttweld fittings are released. Each piece is marked with grade, size, rating and heat number for traceability to its EN 10204 3.1 mill test certificate. EN 10204 3.2 certification and inspection by the buyer's nominated third-party agency are available on request, as are PED 2014/68/EU compliance for European projects and IBR certification for Indian boiler applications.
C22 has more chromium and less molybdenum than C276, so it resists oxidising media better while staying strong in reducing acids. C276 is often preferred in strongly reducing environments.
Yes, C22 has excellent resistance to wet chlorine and oxidising chloride solutions, which is one of its main uses in chemical plants.
Yes. Smaller sizes are normally seamless and larger sizes welded, with weld examination as the specification and your order require. Tell us the size, schedule and any construction requirement.
Every order is supplied with EN 10204 3.1 mill test certificates showing heat chemistry and mechanical properties to ASTM B366 WPHC22 (UNS N06022). EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.