alloy 718 tube
Inconel 718
UNS N07718
2.4668
tubing
A high-strength, nickel-chromium-based superalloy widely used for its exceptional performance in extreme environments.
718 alloy tubes are typically made to the international standards ASTM B163 / ASME SB 163 and AMS 5589 / AMS 5590.
Key Characteristics of alloy 718 tube
Temperature Range:
Maintains high yield and tensile strength from cryogenic temperatures up to 700°C (1300°F).It remains oxidation-resistant up to 980°C (1800°F).
Mechanical Properties:
Known for its excellent creep-rupture strength,high fatigue resistance, and toughness.It is a precipitation-hardened (age-hardenable) alloy,often achieving hardness values of 36–45 HRC depending on heat treatment.
Corrosion Resistance:
Highly resistant to many organic and inorganic compounds,seawater and chloride-ion stress-corrosion cracking.It is often used in sour gas and oil environments.
Weldability:
Unlike many nickel superalloys,Alloy 718 has excellent weldability and is resistant to post-weld strain-age cracking.
Element | Ni | Cr | Fe | Nb | Mo | Ti | Al |
|---|---|---|---|---|---|---|---|
Min | 50 | 17 | Balance | 4.75 | 2.8 | 0.65 | 0.2 |
Max | 55 | 21 | – | 5.5 | 3.3 | 1.15 | 0.8 |
Element | Co | C | Mn | Si | P | S | B | Cu |
|---|---|---|---|---|---|---|---|---|
Min | – | – | – | – | – | – | – | – |
Max | 1 | 0.08 | 0.35 | 0.35 | 0.015 | 0.015 | 0.006 | 0.3 |
Property | Tensile Strength (UTS) | Yield Strength (0.2% Offset) | Elongation | Hardness (Rockwell C) |
|---|---|---|---|---|
Solution Annealed | 120–155 ksi (827–1069 MPa) | 60–95 ksi (414–655 MPa) | 30% – 45% | ≤ 25 HRC (typical) |
Precipitation Hardened (Aged) | 180–199 ksi (1240–1375 MPa) | 150–160 ksi (1034–1103 MPa) | 12% – 20% | 36 – 44 HRC |
Common Applications of alloy 718 tube
Aerospace
Jet engine parts, gas turbines, rocket motors and spacecraft components.
Oil & Gas
Downhole tools, drill pipes, casing, tubing hangers and wellhead equipment in high-pressure/high-temperature (HPHT) environments.
Power Generation
Components for nuclear reactors, waste-heat boilers, and steam generators.
Chemical Processing
Heat exchangers, pressure-containing parts and fasteners used in highly corrosive media.
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