Inconel 625/718 pipe fittings (ASME B16.9, DIN, EN standards) certified by ISO and NORSOK. We are also a China National Petroleum Corporation (CNPC) certified manufacturer of Inconel flanges (UNS N06600, UNS N06601, UNS N06625, UNS N07718UNS N06600, UNS N06601, UNS N06625, UNS N07718, ASME, DIN, EN standards). Our product range includes Inconel reducers, Inconel elbows, Inconel long/short radius elbows, Inconel LR elbows, Inconel SR elbows, Inconel compression fittings, Inconel single ferrule fittings, and Inconel double ferrule fittings. is the sixth largest Inconel manufacturer in China. We export Inconel tees, Inconel short sections, Inconel double flange fittings, Inconel machined fittings, threaded Inconel fittings (Alloy 600 and Alloy 625), and NPT fittings.
Understanding the differences between Inconel 625 and Inconel 718 pipe fittings
Inconel 625 fittings are primarily used in marine and chemical environments due to their excellent corrosion resistance; while Inconel 718 fittings are suitable for high-strength, creep-resistant applications such as aerospace engines. Inconel 625 is easier to process and has higher temperature stability, while Inconel 718 is a precipitation-hardening alloy with higher hardness.
What are the disadvantages of Inconel 718?
Disadvantages and alternatives of Inconel 718
While Inconel 718 boasts excellent mechanical and corrosion resistance properties, it also has some drawbacks: High cost: Due to its complex manufacturing process, Inconel 718 is expensive. Difficult to process: Its high hardness makes material removal difficult and accelerates tool wear.
Inconel 718 fittings are pipe connections (such as elbows, tees, flanges, etc.) made of precipitation-hardening nickel-chromium-based superalloy (Inconel 718). Their core feature is precipitation strengthening through elements such as niobium, maintaining ultra-high strength, excellent creep and fatigue resistance at temperatures up to approximately 700℃, while also possessing good corrosion resistance. They are specifically designed for critical piping systems in fields such as aerospace engines, propulsion systems, oil and gas, and high-performance racing cars that require withstanding extreme pressure, high temperatures, and severe vibrations. Ensuring structural integrity and sealing reliability under harsh conditions, they are a top-tier choice for meeting high-strength and high-stability requirements.
Inconel 625 fittings are pipe connections (such as elbows, tees, flanges, etc.) made of a molybdenum and niobium-strengthened nickel-chromium-based superalloy (Inconel 625). Their core advantage lies in the alloy's comprehensive and superior corrosion resistance and high strength, effectively resisting pitting corrosion, crevice corrosion, chloride stress corrosion cracking, and oxidizing and reducing acid media, while also possessing excellent high-temperature strength (approximately 980℃) and creep resistance. They provide durable solutions for applications such as marine engineering, harsh chemical industries, flue gas desulfurization systems, and aerospace, where reliable pipe connections must be ensured under extreme corrosive and high-temperature environments. They represent a superior connection component with a wider corrosion resistance range than Inconel 600 fittings.
| UNS no. | Werkstoff No. | Density (8.8 g/cm3) | ||
| Alloy 625 | Inconel 625 | N06625 | 2.4856 | 8.44 |
| Alloy 718 | Inconel 718 | N07718 | 2.4668 | 8.19 |
Inconel 625/718 pipe fittings production range
| ASTM B366, ASTM SB 366, ASTM B564, ASME SB564 | |
| Inconel 625 (UNS N06625, Alloy 625, 2.4856), Inconel 718 (UNS N07718, Alloy 718) | |
| R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom | |
| ½"NB to 48″NB in Sch 10s, 40s, 80s, 160s, XXS. | |
| ANSI/ASME B16.9, B16.28, MSS-SP-43. |
Inconel 625/718 Forged Fittings Mechanical Properties
| Yield Strength (0.2%Offset) | |||||
|---|---|---|---|---|---|
| Inconel 625 | 8.4 g/cm3 | 1350 ℃ (2460 ℃F) | Psi – 1,35,000 , MPa – 930 | Psi – 75,000 , MPa – 517 | 42.5 % |
| Inconel 718 | 8.2 g/cm3 | 1350 ℃ (2460 ℃F) | Psi – 1,35,000 , MPa – 930 | Psi – 75,000 , MPa – 482 | 45 % |
Butt-welded Inconel 718 alloy pipe fittings
Seamless/welded, 100% radiographic testing
| Sizes 1/2″ – 48″ | ||
| Inconel 45℃ Elbows | Inconel 180℃ LR Return Bends | |
| Inconel 180℃ SR Return Bends | ||
| Inconel 3D Elbow | ||
| Inconel 5D Elbow | ||
625 fittings are a better choice. For high-stress, high-pressure, or high-temperature mechanical performance requirements, 718 fittings are more ideal.
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.