Super Duplex 2507 Flanges are made to ASTM A182 / ASME SA182 F53 (UNS S32750) for seawater and offshore 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 Super Duplex 2507 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 A182 / ASME SA182 F53 (UNS S32750) |
|---|---|
| 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 |
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 flanges must be forged and heat treated within narrow temperature limits and water quenched to keep a balanced ferrite-austenite structure free of sigma phase. Ferrite measurement, impact tests at low temperature and ASTM A923 / G48 tests are normally written into the order.
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.
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.
We make Super Duplex 2507 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 A182 F53 (UNS S32750). EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.