Inconel 625 buttweld fittings are made from Alloy 625 (UNS N06625) to ASTM B366 / ASME SB366 grade WPNCMC, formed from 625 pipe, plate or bar and dimensioned to ASME B16.9. They are used in piping systems where stainless and duplex steels reach their limits: hot or stagnant seawater, sour gas, mixed acids and high-temperature oxidising service.
Raaj Fittings manufactures Alloy 625 elbows, tees, reducers, caps and stub ends at our two plants in India, seamless and welded, in schedules from 5S upwards, for offshore, chemical, refinery and power projects in the Middle East, Europe and the Americas.
| Material specification | ASTM B366 / ASME SB366 WPNCMC (UNS N06625), seamless or welded |
|---|---|
| Starting material | Alloy 625 pipe (ASTM B444), plate (ASTM B443) or bar (ASTM B446) |
| Dimensional standards | ASME B16.9, MSS SP-43; bevelled ends to ASME B16.25 |
| 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 |
| Element, % | UNS N06625 |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium + tantalum (Nb + Ta) | 3.15 – 4.15 |
| Iron (Fe) | 5.0 max |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Phosphorus (P) | 0.015 max |
| Sulphur (S) | 0.015 max |
| Aluminium (Al) | 0.40 max |
| Titanium (Ti) | 0.40 max |
| Cobalt (Co) | 1.0 max |
| Property (min.), annealed | UNS N06625 |
|---|---|
| Tensile strength | 827 MPa (120 ksi) |
| Yield strength (0.2% offset) | 414 MPa (60 ksi) |
| Elongation | 30% |
| Grade | UNS | Werkstoff Nr. | EN / DIN designation | Common names |
|---|---|---|---|---|
| Alloy 625 | N06625 | 2.4856 | NiCr22Mo9Nb | Inconel® 625 |
Every heat is PMI-verified and its chemistry and mechanical properties are confirmed against the material specification before the 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.
WPNCMC is the ASTM B366 grade designation for wrought fittings in nickel-chromium-molybdenum-columbium alloy UNS N06625, commonly known as Alloy 625 or Inconel 625.
Matching ERNiCrMo-3 (AWS A5.14) filler is normally used, with a qualified low-heat-input procedure.
Yes. Smaller sizes are made seamless from 625 pipe or bar; larger sizes are welded from plate, with the welds examined as specified on the order.
Yes, Alloy 625 is widely used in sour oil and gas service and can be supplied to NACE MR0175 / ISO 15156 when specified.