INCONEL 718 Seamless Tube | Aerospace Precision
Inconel 718 seamless tube features age-hardened γ'' phase strengthening, delivering fatigue strength >825 MPa for rocket engine feed lines. Compliant with AMS 5596 and SGS material traceability. Explore our inconel 718 seamless tube and 601 seamless tube for high-performance solutions in extreme environments.
| Technical Specifications | |
| Seawater Velocity Limit | 7 m/s (No erosion) |
| Electrical Resistivity | 58 μΩ·cm |
| Cold Workability | 85% reduction area |
| Cleanliness | Oil-free <0.1mg/m² |
Gamma-double prime (γ'') formation via 4.75-5.5% niobium with aluminum <0.8% and titanium <1.15%. Carbon restricted to 0.08% max to prevent MC carbides.
Aged Strength: 1300 MPa UTS / 1100 MPa YS
Cryogenic Toughness: >100J @-196°C
Fatigue Strength: 825 MPa stress range @10⁷ cycles
Creep Life: 10,000h @650°C under 350 MPa
Triple-vacuum melting (VIM + VAR + ESR). Cold drawing with intermediate solution anneals. Aging heat treatment at 718°C. Fluorescent penetrant inspection (ASTM E1417).
Turbine engine combustion liners (FAR 33.97)
Space launch vehicle propulsion ducts
Aircraft hydraulic actuation lines (AS4070)
Hypersonic vehicle thermal protection systems
AMS 5596 (Rev G) • AS9100 Rev D • ESA ECSS-Q-ST-70-71
1. Outstanding High-Temperature Strength
Inconel seamless tubes are engineered to perform exceptionally well under extreme heat. Thanks to their nickel-chromium alloy composition, they maintain high mechanical strength and oxidation resistance even at temperatures exceeding 1000°C. This makes them the preferred choice for heat exchangers, gas turbines, and furnace systems, where ordinary stainless steels would deform or lose strength.
2. Excellent Corrosion and Oxidation Resistance
One of the greatest advantages of Inconel seamless tubes is their superior resistance to corrosion and oxidation, especially in harsh chemical and marine environments. They resist attack from acids, alkalis, and chlorides — including pitting, crevice corrosion, and stress corrosion cracking. This makes them highly reliable for use in chemical processing plants, offshore platforms, and seawater systems.
3. Exceptional Pressure and Fatigue Resistance
The seamless construction provides uniform strength throughout the tube, with no weld seams or weak points. Combined with Inconel’s high tensile strength and excellent fatigue resistance, these tubes perform reliably under high-pressure and cyclic loading conditions, such as in aerospace fuel systems and power plant boilers.
4. Long Service Life and Low Maintenance
Although Inconel seamless tubes come with a higher initial cost, they deliver long-term value through durability and minimal maintenance needs. Their ability to withstand aggressive environments, temperature fluctuations, and high stress significantly reduces the risk of failure or unplanned shutdowns — an essential advantage for industries that demand continuous operation.
5. Versatility Across Industries
With their combination of heat, corrosion, and pressure resistance, Inconel seamless tubes are used in some of the world’s most demanding industries — including oil and gas, petrochemical, aerospace, and marine engineering. Their performance reliability under extreme conditions ensures stable operation and extended service life, even in environments that push materials to their limits.
