Hastelloy C276 Flanges are made to ASTM B564 / ASME SB564 UNS N10276 for mixed acid and chlorine service. They are supplied in every common flange type and facing to ASME B16.5, B16.47 and the main EN, DIN, BS and JIS standards.
Raaj Fittings manufactures Hastelloy C276 flanges in-house at our two plants in India, from ½" to 60" and in Class 150 to Class 2500, 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 N10276 |
|---|---|
| Dimensional standards | ASME B16.5 (½" to 24"), ASME B16.47 Series A and B (26" to 60"), EN 1092-1, DIN, BS 4504, JIS B2220 |
| Pressure class | ASME Class 150, 300, 600, 900, 1500 and 2500; PN 6 to PN 400 |
| Facing | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| 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 |
Nickel alloy flanges are forged from certified bar or billet and machined; their high cost means flange type and facing should be chosen carefully, and lap joint flanges with Hastelloy C276 stub ends are sometimes used to save material.
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the flanges 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.
We make Hastelloy C276 Flanges from ½" to 24" to ASME B16.5 and from 26" to 60" to ASME B16.47 Series A and B, in Class 150 to 2500, and to EN 1092-1, DIN, BS and JIS standards in PN ratings.
Every order is supplied with EN 10204 3.1 mill test certificates showing heat chemistry and mechanical properties to ASTM B564 UNS N10276. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.