Inconel 718 (UNS N07718) Seamless Pipes & Tubes Manufacturer & Supplier
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.
UNS: N07718 | Category: Nickel-Chromium Precipitation Hardening Alloy | Werkstoff Nr: 2.4668 | EN Name: NiCr19NbMo
Alloy 718 — Also Known As
Alloy 718 is also commonly 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, ni cr19fe19nb5mo3.
Alloy 718 — Applicable Standards & Specifications
Alloy 718 is commonly supplied to ASTM B163, ASTM B167, ASTM B444, ASME SB163, ASME SB167, ASME SB444, EN 10216-5.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 80S
Chemical Composition (%)
| 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
- Tensile Strength
- 1241 MPa min (age hardened)
- Yield Strength
- 1034 MPa min (age hardened)
- Elongation
- 12% min
- Hardness
- 36 HRC max (solution annealed)
Physical Properties
- Density
- 8.19 g/cm3
- Melting Range
- 1260-1336 C
- Thermal Conductivity
- 11.4 W/m-K
- Electrical Resistivity
- 1250 nOhm-m
- Specific Heat
- 435 J/kg-K
- Coeff. of Thermal Expansion
- 13.0 um/m-C
Corrosion Resistance
- 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
Applicable Standards
- ASTM B637 / ASME SB637
- ASTM B670
- AMS 5662 / AMS 5663
- API 6A718
- DIN 17751
Applications
- Gas turbine and jet engine components
- Oil & gas downhole tools and wellhead equipment
- Cryogenic storage tanks
- Nuclear reactor components
- Aerospace fasteners and structural parts
- High-strength subsea equipment
Industries Served
- Aerospace
- Oil & Gas
- Nuclear
- Power Generation
- Cryogenic
Key Advantages
- Highest strength of all common nickel alloys (1241 MPa tensile)
- Excellent weldability for a precipitation-hardened alloy
- Outstanding mechanical properties at cryogenic to 704C
- Slow age-hardening response simplifies welding and fabrication
- API 6A718 approved for critical oil & gas wellhead equipment
- Excellent fatigue and creep-rupture properties
Equivalent Grades
- ASTM
- N07718
- Trade
- Inconel 718
- AMS
- 5662/5663
- API
- 6A718