Incoloy 825 Forged Fittings are made to ASTM B564 / ASME SB564 UNS N08825 for sour gas and acid service. Socket weld and threaded fittings are dimensioned to ASME B16.11 for small-bore Incoloy 825 piping.
Raaj Fittings manufactures Incoloy 825 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 N08825 |
|---|---|
| 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 825 (UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed for sulphuric and phosphoric acid service and is widely used in oil and gas for its resistance to sour, CO₂ and chloride environments.
| Element, % | N08825 |
|---|---|
| Nickel (Ni) | 38.0 – 46.0 |
| Iron (Fe) | 22.0 min |
| Chromium (Cr) | 19.5 – 23.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
| Carbon (C) | 0.05 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.50 max |
| Sulphur (S) | 0.03 max |
| Aluminium (Al) | 0.2 max |
| Property | Incoloy 825 |
|---|---|
| Tensile strength, min. | 586 MPa (85 ksi) |
| Yield strength (0.2%), min. | 241 MPa (35 ksi) |
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| N08825 | 2.4858 | NiCr21Mo | Incoloy® 825 |
In small-bore lines, the crevices of socket welds and threads are where corrosion starts. Incoloy 825 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.
Its nickel, molybdenum and copper give strong resistance to sour (H₂S), CO₂ and chloride environments, and it is a common material for clad pipe, flowlines and process piping in sour fields.
825 is more economical and excellent in sulphuric acid and sour service; 625 has higher strength and better pitting resistance in warm seawater.
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 N08825. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.