Hastelloy C22 Forged Fittings are made to ASTM B564 / ASME SB564 UNS N06022 for oxidising and mixed-acid service. Socket weld and threaded fittings are dimensioned to ASME B16.11 for small-bore Hastelloy C22 piping.
Raaj Fittings manufactures Hastelloy C22 forged fittings in-house at our two plants in India, from ⅛" to 4" in Class 2000 to 9000, 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 B564 / ASME SB564 UNS N06022 |
|---|---|
| Dimensional standard | ASME B16.11; MSS SP-79, SP-83, SP-95 and SP-97 |
| Size range | ⅛" to 4" NPS |
| Pressure class | Socket weld: Class 3000, 6000, 9000. Threaded: Class 2000, 3000, 6000 |
| Threads | NPT to ASME B1.20.1; BSPT / BSPP to BS 21 / ISO 7-1 |
| 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 |
In small-bore lines, the crevices of socket welds and threads are where corrosion starts. Hastelloy C22 forged fittings keep the same corrosion resistance as the run pipe at those points. Use matching filler for socket welds and an anti-seize sealant on threads, as nickel alloys gall easily.
| Pipe | Socket weld class | Threaded class |
|---|---|---|
| SCH 80 / XS | 3000 | 2000 |
| SCH 160 | 6000 | 3000 |
| XXS | 9000 | 6000 |
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the forged 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.
Class 3000 socket weld fittings match SCH 80 pipe, Class 6000 matches SCH 160 and Class 9000 matches XXS. For threaded fittings, the matching classes are 2000, 3000 and 6000.
Every order is supplied with EN 10204 3.1 mill test certificates showing heat chemistry and mechanical properties to ASTM B564 UNS N06022. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.