ASTM B366 N08825 N04400 N06625 UNS N02200 UNS N06600 N10276 Elbow Tee Reducer Pipe fittings
ASTM B366 Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
This specification covers wrought welding fittings for pressure piping, factory-made from nickel and nickel alloys. Threaded fittings as covered in ASME B16.11 are also covered by this specification. The term welding applies to butt-welding or socket-welding parts such as 45° and 90° elbows, 180° bends, caps, tees, reducers, lap-joint stub ends, and other types, as covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-95, and MSS SP-97. 1.1.1 Several grades of nickel and nickel alloys are included in this specification.
Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards. 1.1.2 Class WP fittings are those manufactured to the requirements of ASME B16.9, B16.11.
Material Grades Under ASTM B366
| Grade | UNS Designation | Common Trade Name | Key Features |
| WPNIC | UNS N06600 | Inconel 600 | High resistance to oxidation and corrosion at elevated temperatures. |
| WPNC | UNS N04400 | Monel 400 | Excellent resistance to seawater and acidic environments. |
| WPNIC | UNS N08800 | Incoloy 800 | High-temperature strength and resistance to oxidation. |
| WPNIC10 | UNS N08810 | Incoloy 800H | High-temperature strength and resistance to oxidation. |
| WPHC276 | UNS N10276 | Hastelloy C276 | Exceptional corrosion resistance to strong oxidizers and reducing agents. |
| WP20CB | UNS N08020 | Alloy 20 | Resistant to sulfuric acid and chloride-induced stress corrosion cracking. |
| WPHC2000 | UNS N06200 | Alloy 200 | High resistance to acids and alkalis, with excellent mechanical properties. |
| WPNICMC | UNS N08825 | Incoloy 825 | Outstanding resistance to acidic and oxidizing environments. |
| WPNCMC | UNS N06625 | Inconel 625 | High strength and corrosion resistance, especially in marine environments. |
| WPHX | UNS N06002 | Hastelloy X | Excellent resistance to high-temperature oxidation. |
| WPN | UNS N02200 | Nickel 200 | Excellent corrosion resistance in reducing environments. |
Fitting Types available under B366 standard materials
1. Elbows:
- 45° and 90° 190deg elbows for directional change.
2. Tees:
- Equal and reducing tees for branching pipes.
3. Reducers:
- Concentric and eccentric reducers for diameter transition.
4. Caps:
- End closures for pipe systems.
5. Crosses:
- Four-way fittings for intersecting pipes.
ASTM B366 Fittings Size range
| Size | 1/8” NBt to 24″ NB |
| Thickness | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Type | Seamless / Welded / Fabricated |
Applications of ASTM B366 Fittings
- Chemical Processing:
- Resistance to acids, alkalis, and high temperatures.
- Marine Engineering:
- Corrosion resistance in seawater and marine environments.
- Aerospace:
- Lightweight and high-strength components for jet engines and exhaust systems.
- Power Plants:
- Heat exchangers and boiler piping.
astm-b366 is a standard specification for factory-made wrought nickel and nickel alloy fittings. These fittings are widely used in industries requiring high resistance to corrosion and heat, such as chemical processing, marine environments, power plants, and aerospace applications.
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