ASTM A350 LF3 Forged Fittings are made to ASTM A350 / ASME SA350 LF3 for cryogenic hydrocarbon service. Socket weld and threaded fittings are dimensioned to ASME B16.11 for small-bore ASTM A350 LF3 piping.
Raaj Fittings manufactures ASTM A350 LF3 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 A350 / ASME SA350 LF3 |
|---|---|
| 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 |
ASTM A350 LF3 is a 3.5% nickel steel for forgings in very cold service. The nickel lowers the ductile-brittle transition temperature, and each heat is Charpy impact tested at −101 °C (−150 °F).
| Element, % | K32025 |
|---|---|
| Nickel (Ni) | 3.3 – 3.7 |
| Carbon (C) | 0.20 max |
| Manganese (Mn) | 0.90 max |
| Phosphorus (P) | 0.035 max |
| Sulphur (S) | 0.040 max |
| Silicon (Si) | 0.20 – 0.35 |
| Property | ASTM A350 LF3 |
|---|---|
| Tensile strength | 485 – 655 MPa (70 – 95 ksi) |
| Charpy impact at −101 °C | 20 J average / 16 J single |
| UNS | Werkstoff Nr. | EN / DIN | Other |
|---|---|---|---|
| K32025 | — | 12Ni14 (comparable) | — |
ASTM A350 LF3 socket weld and threaded fittings are forged, normalised and impact tested on each heat, then CNC machined. They are the small-bore partners of low-temperature carbon steel pipe and flanges.
| 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.
Charpy impact results at the specified test temperature are reported for each heat.
LF3 is used when the minimum design temperature is below −46 °C, the limit of LF2. It is impact tested at −101 °C thanks to its 3.5% nickel content.
LF3 forged fittings are normally used with 3.5% nickel steel pipe such as ASTM A333 Grade 3.
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 A350 LF3. EN 10204 3.2 certification and inspection by your nominated third-party agency are available on request.