Also known as: Alloy 718, 718 Alloy, Inconel 718 (UNS N07718) Seamless Pipes & Tubes, N07718, UNS N07718, 2.4668, Werkstoff 2.4668, W.Nr 2.4668, NiCr19NbMo, inconel 718
Inconel 718 (UNS N07718) Seamless Pipes & Tubes
Alloy 718 (Inconel 718, UNS N07718) is a precipitation-hardenable nickel-chromium alloy containing significant amounts of niobium and molybdenum. It possesses exceptionally high yield, tensile, and creep-rupture properties at temperatures up to 704C. Its unique age-hardening response allows it to be welded and annealed without spontaneous hardening during heating and cooling.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 80S
Standards
5 specs
Chemical Composition (% by weight)
| Ni | Cr | Nb+Ta | Mo | Ti | Al | Fe | Co | C | Mn | Si |
|---|---|---|---|---|---|---|---|---|---|---|
| 50.0-55.0 | 17.0-21.0 | 4.75-5.50 | 2.80-3.30 | 0.65-1.15 | 0.20-0.80 | Remainder | 1.0 max | 0.08 max | 0.35 max | 0.35 max |
Mechanical Properties (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 1241 MPa min (age hardened) | 1034 MPa min (age hardened) | 12% min | 36 HRC max (solution annealed) |
Physical Properties - Alloy 718
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 8.19 g/cm3 | 1260-1336 C | 11.4 W/m-K | 1250 nOhm-m | 435 J/kg-K | 13.0 um/m-C |
Corrosion Resistance - Alloy 718
| Property | Value |
|---|---|
| Pitting Resistance (PREN) | N/A (precipitation hardened) |
| Max Service Temp (Oxidizing) | 704 C (age-hardened service) |
| Intergranular Corrosion | Good when properly heat treated |
| Stress Corrosion Cracking | Good resistance |
| General Corrosion Rate | Good in mild environments |
| Seawater Resistance | Good |
Equivalent International Grades
| ASTM | Trade | AMS | API |
|---|---|---|---|
| N07718 | Inconel 718 | 5662/5663 | 6A718 |
Alloy 718 vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| Alloy 625Nickel-Chromium-Molybdenum Alloy | N06625 | 827 MPa min | 414 MPa min | >50 (exceptional) | 980 C |
| Alloy C-276Nickel-Molybdenum-Chromium Alloy | N10276 | 690 MPa min | 283 MPa min | >70 (highest available) | 1093 C |
| Alloy 825Nickel-Iron-Chromium-Molybdenum Alloy | N08825 | 586 MPa min | 241 MPa min | ~31 | 540 C |
Applicable Standards
Applications
Key Advantages of Alloy 718
Alloy 718 Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Used in critical oil & gas wellhead equipment, subsea tools, and downhole components across UAE, Saudi Arabia, Qatar, and Oman.
Europe (Germany, UK, Norway, Netherlands, Italy)
Aerospace-standard alloy in UK, France, and Germany. Also used in North Sea oil & gas wellhead equipment.
United States
Primary alloy for aerospace engine components, oil & gas downhole tools, and nuclear applications.
Frequently Asked Questions about Alloy 718 Seamless Pipes & Tubes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 80S
Industries Served
Related Grades
Related Content
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