Nickel Alloys Fittings
Pipe fittings change the direction, size or branch of a piping system: elbows, tees, reducers, caps, stub ends, crosses and couplings. Butt-weld fittings follow ASME B16.9 (and MSS SP-43 for light-wall stainless). Forged socket-weld and threaded fittings follow ASME B16.11.
Choose a grade below for specifications, composition, sizes and weight charts.
Nickel Alloys fittings by grade
| Grade | Specification | Key characteristic | Typical use |
|---|---|---|---|
| Inconel 600 Fittings | ASTM B366 WPNCI | ≥ 72% nickel: immune to chloride SCC | Furnace muffles, retorts and trays |
| Inconel 601 Fittings | ASTM B366 | Aluminium addition for adherent oxide scale | Radiant tubes and furnace muffles |
| Inconel 625 Fittings | ASTM B366 WPNCMC | High strength without age hardening | Seawater piping and offshore systems |
| Incoloy 800 Fittings | ASTM B366 WPNIC | Fe-Ni-Cr: bridges stainless and nickel alloys | Heat-exchanger and steam-generator tubing |
| Incoloy 800H Fittings | ASTM B366 WPNIC10 | Carbon 0.05–0.10% for creep strength | Steam-methane reformer pigtails and manifolds |
| Incoloy 800HT Fittings | ASTM B366 WPNIC11 | Al + Ti 0.85–1.20% for maximum creep strength | Reformer and cracking furnace components |
| Incoloy 825 Fittings | ASTM B366 WPNICMC | Resistant to sulphuric and phosphoric acids | Sour oil and gas piping and tubulars |
| Monel 400 Fittings | ASTM B366 WPNC | Ni-Cu alloy: excellent in seawater and brackish water | HF alkylation units in refineries |
| Hastelloy C22 Fittings | ASTM B366 WPHC22 | Resists both oxidising and reducing media | Pharmaceutical and fine-chemical reactors |
| Hastelloy C276 Fittings | ASTM B366 WPHC276 | About 16% Mo, 15.5% Cr, 3.7% W | Chemical reactors and heat exchangers |
| Nickel 200 Fittings | ASTM B366 WPN | 99.0% min nickel | Caustic soda evaporators and piping |
| Nickel 201 Fittings | ASTM B366 WPNL | Carbon 0.02% max: no graphitisation | High-temperature caustic evaporators |
How nickel alloys fittings are made, sized and tested
How it's madeButt-weld fittings are formed from seamless or welded pipe or plate by hot or cold forming (mandrel bending, hydraulic bulging, pressing), then heat treated, bevelled and finished. Socket-weld and threaded fittings are machined from forgings or bar.
- Size range
- Butt-weld ½" – 48" (larger fabricated to order) in schedules matching the pipe; socket-weld and threaded ⅛" – 4" in Class 2000, 3000, 6000 and 9000
- Finish
- Annealed & pickled, shot-blasted, black painted or galvanised (by material)
- Ends
- Bevelled (butt-weld), socket-weld, threaded NPT/BSP
Testing & documents
- Chemical and mechanical tests of the starting material
- Dimensional inspection to B16.9 / B16.11
- Radiography of welded fittings (seamed WPW/WX)
- Hardness, IGC and impact tests as specified
- EN 10204 3.1 certificate; 3.2 with third-party inspection
Frequently asked questions
What is the difference between WP and F designations?
WP (wrought pipe fitting) grades such as A403 WP316L cover butt-weld fittings. F grades such as A182 F316L cover forged fittings and flanges.
What is a long-radius elbow?
An elbow whose centreline radius is 1.5 × NPS. Short-radius elbows have a radius equal to NPS.
Which nickel alloys grades are available as fittings?
Inconel 600, Inconel 601, Inconel 625, Incoloy 800, Incoloy 800H, Incoloy 800HT, Incoloy 825, Monel 400, Hastelloy C22, Hastelloy C276, Nickel 200, Nickel 201.
Which specifications cover nickel alloys fittings?
ASTM B366, depending on grade.
Need nickel alloys fittings?
Send grade, size, quantity and destination.