Super Duplex 2507 Buttweld Fittings are made to ASTM A815 / ASME SA815 WPS32750 for seawater and offshore service. Elbows, tees, reducers and caps are dimensioned to ASME B16.9 and bevelled for welding into Super Duplex 2507 pipe.
Raaj Fittings manufactures Super Duplex 2507 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 A815 / ASME SA815 WPS32750 |
|---|---|
| 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 |
Super duplex 2507 (UNS S32750) contains about 25% chromium, 7% nickel, 4% molybdenum and 0.3% nitrogen, giving a pitting resistance equivalent number (PREN) of at least 40. It handles warm seawater and high-chloride brines that are beyond duplex 2205, with a minimum yield strength above 550 MPa.
| Element, % | S32750 |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.20 max |
| Phosphorus (P) | 0.035 max |
| Sulphur (S) | 0.020 max |
| Silicon (Si) | 0.80 max |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.32 |
| Copper (Cu) | 0.50 max |
| Property | Super Duplex 2507 |
|---|---|
| Tensile strength, min. | 800 MPa (116 ksi) |
| Yield strength (0.2%), min. | 550 MPa (80 ksi) |
| Elongation, min. | 15% |
| Hardness, max. | 310 HBW |
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| S32750 | 1.4410 | X2CrNiMoN25-7-4 | ASTM A182 F53 |
Super duplex fittings are solution annealed and water quenched after forming. Because the microstructure is sensitive to heat input, welding procedures are qualified with ferrite and impact testing, and 2594-type super duplex filler is used.
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.
Ferrite, impact and ASTM A923 / G48 results are reported when they are specified.
2507 has more chromium, molybdenum and nitrogen, giving a PREN of at least 40 against about 35 for 2205, and a higher yield strength. It is chosen for warmer seawater and higher chloride levels.
Ferrite content (often 35–65%), Charpy impact tests at low temperature, ASTM A923 for intermetallic phases and ASTM G48 pitting tests are typical, together with hardness checks.
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 A815 WPS32750. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.