Hastelloy C276 Buttweld Fittings are made to ASTM B366 / ASME SB366 WPHC276 (UNS N10276) for mixed acid and chlorine service. Elbows, tees, reducers and caps are dimensioned to ASME B16.9 and bevelled for welding into Hastelloy C276 pipe.
Raaj Fittings manufactures Hastelloy C276 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 WPHC276 (UNS N10276) |
|---|---|
| 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 C276 (UNS N10276) is a nickel-molybdenum-chromium alloy with tungsten, one of the most corrosion-resistant alloys used in process piping. Its very low carbon and silicon let it be welded without losing corrosion resistance at the welds.
| Element, % | N10276 |
|---|---|
| Molybdenum (Mo) | 15.0 – 17.0 |
| Chromium (Cr) | 14.5 – 16.5 |
| Iron (Fe) | 4.0 – 7.0 |
| Tungsten (W) | 3.0 – 4.5 |
| Cobalt (Co) | 2.5 max |
| Carbon (C) | 0.010 max |
| Silicon (Si) | 0.08 max |
| Manganese (Mn) | 1.00 max |
| Vanadium (V) | 0.35 max |
| Nickel (Ni) | Balance |
| Property | Hastelloy C276 |
|---|---|
| Tensile strength, min. | 690 MPa (100 ksi) |
| Yield strength (0.2%), min. | 283 MPa (41 ksi) |
| Elongation, min. | 40% |
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| N10276 | 2.4819 | NiMo16Cr15W | Hastelloy® C-276 |
Hastelloy C276 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.
Hastelloy is a trademark of Haynes International. Fittings are supplied to the ASTM specifications for UNS N10276, commonly called Alloy C276, which has the same chemistry.
C276 has higher molybdenum and tungsten and is preferred in strongly reducing acids, mixed acids and wet chlorine service; 625 is often chosen for seawater and high-strength applications.
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 WPHC276 (UNS N10276). EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.