Duplex 2205 forged fittings are socket weld and threaded fittings forged from ASTM A182 F51 (UNS S31803) or F60 (UNS S32205) and machined to ASME B16.11. They complete duplex piping systems in the small bores where instrument connections, drains, vents and chemical injection lines branch off, so the whole line has the same strength and chloride resistance as the duplex run pipe.
Raaj Fittings forges duplex F51 elbows, tees, crosses, couplings, caps, plugs, bushings and nipples in-house at our two plants in India, from ⅛" to 4" and in Class 2000 to 9000, with the heat treatment and testing duplex steel needs, for offshore and process projects in the Middle East, Europe and the Americas.
| Material specification | ASTM A182 / ASME SA182 F51 (UNS S31803), F60 (UNS S32205) |
|---|---|
| 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 |
| Heat treatment | Solution annealed and water quenched after forging |
| Certification | EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request |
| Element, % | F51 (S31803) | F60 (S32205) |
|---|---|---|
| Carbon (C) | 0.030 max | 0.030 max |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Phosphorus (P) | 0.030 max | 0.030 max |
| Sulphur (S) | 0.020 max | 0.020 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Chromium (Cr) | 21.0 – 23.0 | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 | 3.0 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 | 0.14 – 0.20 |
| Property (min.) | F51 | F60 |
|---|---|---|
| Tensile strength | 620 MPa (90 ksi) | 655 MPa (95 ksi) |
| Yield strength (0.2% offset) | 450 MPa (65 ksi) | 450 MPa (65 ksi) |
| Elongation | 25% | 25% |
| Grade | UNS | Werkstoff Nr. | EN designation | Forging grade |
|---|---|---|---|---|
| Duplex 2205 | S31803 / S32205 | 1.4462 | X2CrNiMoN22-5-3 | ASTM A182 F51 / F60 |
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.
Duplex F51 has more than twice the yield strength of 316L and much better resistance to chloride pitting and stress corrosion cracking. In a duplex piping system, duplex small-bore fittings keep the same corrosion resistance and strength throughout.
A 2209 duplex filler is normally used, with a qualified welding procedure that controls heat input and interpass temperature to keep the ferrite-austenite balance.
Yes. Besides F51 and F60 duplex 2205, we make super duplex 2507 (F53) and Zeron 100 (F55) forged fittings for more aggressive seawater service.
Ferrite measurement, Charpy impact testing, ASTM A923 tests for intermetallic phases and hardness testing can be added, together with third-party inspection and EN 10204 3.2 certificates.