Gnee Steel is internationally renowned for its pipe assemblies used in the manufacture and export of high-performance Inconel 718 fittings, meeting the stringent requirements of critical applications. Our fittings are manufactured to strict ASTM B366 and ASME SB366 standards, with a design intended to withstand high temperatures, intense mechanical stresses, and rust-prone environments. We are committed to rigorous quality control of every fitting, from raw materials to final delivery, including dimensional accuracy testing and full traceability. Our facility is ISO 9001:2015 certified. With a robust global logistics system, we can quickly and easily ship packages to over 45 countries.
A comprehensive guide to Inconel 718 Fittings
A comprehensive guide to Inconel 718 Fittings
Inconel 718 fittings are high-performance nickel-based superalloy components designed for extreme environments, offering exceptional strength, corrosion resistance, and stability, remaining stable at temperatures up to 700°C (1300°F). They are widely used in critical, high-stress, and highly corrosive applications, particularly in the aerospace and oil and gas industries.
What are the limitations of Inconel 718?
Due to the relatively low thermal conductivity of nickel-based alloys such as Inconel 718, heat tends to accumulate at the tool tip during machining. This can lead to excessive tool wear, shortening tool life or reducing machining speed.
Inconel 718 fittings are used to connect or reroute piping systems subjected to high stress. These fittings meet industry standards for both mechanical and thermal properties. They are made from a nickel-based alloy, primarily composed of nickel, chromium, and iron. Niobium and molybdenum are also added for increased strength. Inconel 718 is unique for its high strength, resistance to rust, and resistance to creep and wear. All these properties make it perform exceptionally well in high-stress and high-temperature environments.
These fittings conform to the ASTM B366 Inconel 718 fitting standard and are widely used in aerospace, nuclear power, and power generation industries where mechanical integrity and temperature stability are critical. While Inconel 600 and Inconel 601 fittings are superior to other materials in terms of oxidation and carburization resistance, Inconel 718 fittings excel in high-temperature resistance and durability. Inconel 625 fittings are also known to be resistant to rust.
UNS N07718 Fittings Specification
| Specification: | Inconel 718 Pipe Fittings |
| Type: | Butt Weld (BW), Welded, Seamless (SMLS) |
| Thickness: | Sch 5S, 20S, S10, S20, S30, 10S, S80, S100, S120, STD, 40S, S40, S60, XS, 80S, S140, S160, XXS and etc. |
| Type Of Dimension: | ANSI B16.28, MSS-SP-43 Type A, JIS B2312, ANSI B16.9, MSS-SP-43 Type B, JIS B2313 |
| Fittings Standard | DIN, EN, ISO, JIS, NPT |
| ASME B16.9 Type | Elbow, Tee, Reducer, Cap, Stub End, Bend, Adapter, Wye, Cross, |
| Connection Type | Threaded/ Weld/ Flange/ Clamp End / End Bell |
| Pressure-Temperature Class | Class 150, Class 300, Class 600, Class 1500, Class 2500. |
| Schedule: | Schedule 5 TO Sch XXS. |
| Size: | Normal Pipe Size 1⁄₂ to NPS 48" |
ASTM B366 Inconel Alloy 718 Pipe Fittings Chemical Composition
| C | Mn | P | S | Si | Cr | Ni | Mo | Cb | Ta | Ti | Al | Co | B | Cu |
| 0.08 | 0.35 | 0.015 | 0.015 | 0.35 | 17-21 | 50-55 | 2.8-3.30 | 4.75-5.50 | 0.05 | 0.65-1.15 | 0.20-0.80 | 1.00 | 0.006 | 0.30 |
718 Inconel ASME SB366 Butt weld Fittings Mechanical Properties
| Ultimate Tensile Strength, psi | .2% Yield Strength psi | Elongation % | Hardness Rockwell B |
| 135,000 | 70,000 | 45 | 100 |
Inconel 718 pipe fittings product range and types
Gnee Steel offers a range of robust and durable Inconel fittings designed to meet the demands of various industries operating in harsh environments. Each fitting is durable and maintains mechanical integrity even under severe conditions. All fittings are carefully designed for smooth connections in high-pressure, high-temperature systems. Our product range covers both standard and custom sizes and conforms to ASTM B366 standards.
Inconel 718 Fittings
Elbows (90°, 45°, Long Radius, Short Radius)
These elbows are used to change the direction of fluid flow, offering a variety of radius and angle configurations, providing flexible layout options while maintaining structural strength and corrosion resistance.
Tees (Equal Tees, Reducing Tees)
Our tees are ideal for branching or merging in piping systems, perform reliably under thermal stress, and are available in both equal and reducing types to accommodate different piping designs.
Reducers (Concentric, Eccentric)
These fittings facilitate transitions between pipes of different sizes without interrupting fluid flow. Concentric reducers maintain pipe alignment, while eccentric reducers help prevent air buildup in horizontal piping.
Pipe Fittings (Full Fittings, Half Fittings)
Our full and half fittings are used to securely connect two pipe sections, designed to provide superior sealing, weldability, and pressure resistance for demanding applications.
Short Sections (Short/Long)
Short sections are primarily used to connect lap flanges and are available in both short and long sizes for systems requiring frequent disassembly and maintenance.
Union Fittings, Cross Fittings, Short Sections
These small components play a crucial role in high-precision assembly, enabling changes in direction, branching, and robust pipe extensions while maintaining leak-proof performance.
According to ASME B16.9 standard, the dimensions of 718 alloy elbows are shown in the table.
| NPS (Normal Pipe Size) | O.D. (Outside Daimeter) | Elbow 90 Deg | Elbow 45 Deg | Return Elbow 180 Deg | ||||
|---|---|---|---|---|---|---|---|---|
| (inch) | Long Radius Elbow | Short Radius | Long Radius Elbow | Long Radius Elbow | ||||
| (millimeter/ MM) | (inch./ Inches) | Center to Face (Inches) |
Center to Face (Inches) |
Center to Face (Inches) |
Radius (Inches) |
Center to Center (Inches) |
Back to face (Inches) |
|
| 1/2 | 21.3 | 0.840 | 1 1/2 | – | 5/8 | 2 | 1 7/8 | |
| 3/4 | 26.7 | 1.050 | 1 1/8 | – | 7/16 | 2 1/4 | 1 11/16 | |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 | 7/8 | 3 | 2 3/16 | |
| 1 1/4 | 42.2 | 1.660 | 1 7/8 | 1 1/4 | 1 | 3 3/4 | 2 3/4 | |
| 1 1/2 | 48.3 | 1.900 | 2 1/4 | 1 1/2 | 1 1/8 | 3 | 4 1/2 | 3 1/4 |
| 2 | 60.3 | 2.375 | 3 | 2 | 1 3/8 | 4 | 6 | 4 3/16 |
| 2 1/2 | 73.0 | 2.875 | 3 3/4 | 2 1/2 | 1 3/4 | 5 | 7 1/2 | 5 3/16 |
| 3 | 88.9 | 3.500 | 4 1/2 | 3 | 2 | 6 | 9 | 6 1/4 |
| 3 1/2 | 101.6 | 4.000 | 5 1/4 | 3 1/2 | 2 1/4 | 7 | 10 1/2 | 7 1/4 |
| 4 | 114.3 | 4.500 | 6 | 4 | 2 1/2 | 8 | 12 | 8 1/4 |
| 5 | 141.3 | 5.563 | 7 1/2 | 5 | 3 1/8 | 10 | 15 | 10 5/16 |
| 6 | 168.3 | 6.625 | 9 | 6 | 3 3/4 | 12 | 18 | 12 5/16 |
| 8 | 219.1 | 8.625 | 12 | 8 | 5 | 12 | 24 | 16 5/16 |
| 10 | 273.1 | 10.750 | 15 | 10 | 6 1/4 | 15 | 30 | 20 3/8 |
| 12 | 323.9 | 12.750 | 18 | 12 | 7 1/2 | 18 | 36 | 24 3/8 |
| NPS (Normal Pipe Size) | O.D. (Outside Daimeter) | ASME B16.9 Pipe End Cap | ASME B16.9 Straight Tee | ASME B16.9 Straight Cross | ASME B16.9 Long And Short Stub Ends | |||
|---|---|---|---|---|---|---|---|---|
| (inch./ Inches) | (millimeter/ MM) | (Inches) | Length (Inches) |
Center to End (Inches) |
Center to End (Inches) |
Lap Diameter (Inches) |
Long Length (Inches) |
Short Length (Inches) |
| 1/2 | 21.3 | 0.840 | 1 | 1 | – | 1 3/8 | 3 | 2 |
| 3/4 | 26.7 | 1.050 | 1 | 1 1/8 | – | 1 11/16 | 3 | 2 |
| 1 | 33.4 | 1.315 | 1 1/2 | 1 1/2 | 1 1/2 | 2 | 4 | 2 |
| 1 1/4 | 42.2 | 1.660 | 1 1/2 | 1 7/8 | 1 7/8 | 2 1/2 | 4 | 2 |
| 1 1/2 | 48.3 | 1.900 | 1 1/2 | 2 1/4 | 2 1/4 | 2 7/8 | 4 | 2 |
| 2 | 60.3 | 2.375 | 1 1/2 | 2 1/2 | 2 1/2 | 3 5/8 | 6 | 2 1/2 |
| 2 1/2 | 73.0 | 2.875 | 1 1/2 | 3 | 3 | 4 1/8 | 6 | 2 1/2 |
| 3 | 88.9 | 3.500 | 2 | 3 3/8 | 3 3/8 | 5 | 6 | 2 1/2 |
| 3 1/2 | 101.6 | 4.000 | 2 1/2 | 3 3/4 | 3 3/4 | 5 1/2 | 6 | 3 |
| 4 | 114.3 | 4.500 | 2 1/2 | 4 1/8 | 4 1/8 | 6 3/16 | 6 | 3 |
| 5 | 141.3 | 5.563 | 3 | 4 7/8 | 4 7/8 | 7 5/16 | 8 | 3 |
| 6 | 168.3 | 6.625 | 3 1/2 | 5 5/8 | 5 5/8 | 8 1/2 | 8 | 3 1/2 |
| 8 | 219.1 | 8.625 | 4 | 7 | 7 | 10 5/8 | 8 | 4 |
| 10 | 273.1 | 10.750 | 5 | 8 1/2 | 8 1/2 | 12 3/4 | 10 | 5 |
| 12 | 323.9 | 12.750 | 6 | 10 | 10 | 15 | 10 | 6 |
One-stop supply of all types of Inconel 718 pipe fittings
Inconel 718 Elbow
UNS NO7718 Reducer Tee
DIN 2.4668 Reducer
Alloy 718 End Cap
ASME SB 637 N07718 Stub End
ASTM B637 Inconel 718 Pipe Nipple
Nickel Alloy 718 Plug
Inconel N07718 Union
Custom Fittings
Gnee Steel also offers fully custom Inconel 718 fittings to meet your project needs. Whether it's non-standard geometry, tight tolerances, or special end connections, we provide compliant engineering solutions with complete documentation and material traceability.
Technical Specifications
All Gnee Steel ASTM B366 Inconel 718 fittings can be easily installed in piping systems worldwide because they meet a wide range of pressure and size specifications. Their manufacturing process follows ASME SB366 standards. Therefore, they meet the highest performance, precision, and durability standards in the industry.
Our Inconel 718 (UNS N07718 / Werkstopp Nr. 2.4656) fitting dimensions are based on ASME B16.9 standards (butt weld fittings), ASME B16.9 standards (molded fittings), and MSS SP-79/83/95/97 standards (socket weld/threaded connections). This series includes a wide range of ANSI 150 to 2500 grade fittings, with widths ranging from half an inch to 48 inches. They are used in many different fields, such as aerospace, power generation, oil and gas, and marine engineering, in environments that withstand enormous mechanical stress, temperature variations, and chemical exposure.
Gnee Steel is a professional manufacturer of various nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel Alloy 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy Alloy 800, Incoloy 800H/HT, Incoloy 825, Monel Alloy 400, Monel K500, and high-temperature alloys. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy industries, and we can provide customized alloy material solutions according to customer needs. For alloy material price inquiries or to request customized alloy material solutions, please feel free to contact us at ru@gneesteelgroup.com for a quote.