Inconel® 718
UNS N07718 Precipitation-Hardenable Nickel-Chromium Superalloy
Inconel® 718 (UNS N07718) is a precipitation-hardenable nickel-chromium superalloy designed for exceptional strength and creep resistance at elevated temperatures while retaining excellent corrosion resistance. It is one of the most widely used superalloys in aerospace, gas turbine, and high-performance industrial applications, accounting for roughly half of all nickel-base superalloy tonnage produced worldwide.
The alloy is age-hardened to develop very high yield, tensile, and creep-rupture strength at temperatures up to 1300°F (704°C). Inconel 718 has a sluggish age-hardening response, which gives it excellent fabrication characteristics and dimensional stability during processing.
Inconel 718 offers a unique combination of strength, fatigue resistance, fabrication characteristics, and consistency, making it a workhorse alloy for jet engines, gas turbines, oil and gas downhole tools, and cryogenic service.
Common Names & Cross-References
Designation | Value |
|---|---|
Trade Names | Inconel® 718, Alloy 718, IN718, Nicrofer® 5219 Nb, Pyrowear® 718 |
UNS | N07718 |
German (W.Nr. / DIN) | 2.4668 |
French (AFNOR) | NC19FeNb |
GE Specifications | B50TF14, B50T69, B50TF15, C50TF13 |
Inconel 718 Chemical Composition
Element | Composition (%) |
|---|---|
Nickel (Ni) | 50.0 – 55.0 |
Chromium (Cr) | 17.0 – 21.0 |
Iron (Fe) | Balance |
Niobium (Nb + Ta) | 4.75 – 5.50 |
Molybdenum (Mo) | 2.8 – 3.3 |
Titanium (Ti) | 0.65 – 1.15 |
Aluminum (Al) | 0.20 – 0.80 |
Cobalt (Co) | 1.0 max |
Manganese (Mn) | 0.35 max |
Silicon (Si) | 0.35 max |
Carbon (C) | 0.08 max |
Boron (B) | 0.006 max |
Copper (Cu) | 0.30 max |
Phosphorus (P) | 0.015 max |
Sulfur (S) | 0.015 max |
Typical Mechanical Properties
Property | Annealed | Aged (Precip. Hardened) |
|---|---|---|
Tensile Strength | 120 ksi (827 MPa) | 180 ksi (1241 MPa) |
Yield Strength (0.2%) | 60 ksi (414 MPa) | 150 ksi (1034 MPa) |
Elongation (in 2 in.) | 45% | 12% min |
Hardness | Rockwell B 100 | Rockwell C 36-44 |
Key Features & Advantages
- Very high yield, tensile, and creep-rupture strength up to 1300°F (704°C)
- Excellent fatigue and rupture resistance — critical for rotating engine parts
- Strong corrosion resistance in aerospace and oil & gas environments
- Excellent performance at cryogenic temperatures down to -423°F
- Highly consistent properties due to mature processing and supply base
- API 6A718 and NACE MR0175 approved for sour oil & gas service
Common Applications of Inconel 718
- Aerospace engine components — disks, blades, casings, and fasteners
- Industrial gas turbine hot-section structural hardware
- High-strength fasteners, bolts, and critical mechanical components
- Oil and gas downhole tools and pressure-containing components
- Cryogenic and high-pressure service hardware
- Rocket motor components and space hardware
- Nuclear fuel element spacers
Primary Markets Served
- Aerospace & Defense
- Power Generation & Gas Turbines
- Oil & Gas (sour service)
- Cryogenic & High-Pressure Service
- Space & Defense
When to Specify Inconel 718
- Inconel 718 vs. 625 — 718 is precipitation-hardened with much higher strength (yield ~150 ksi vs. ~60 ksi). Use 718 for structural and rotating parts; use 625 for corrosion service or anywhere age-hardening isn’t desired.
- Inconel 718 vs. Waspaloy — Waspaloy has higher temperature capability (~1400°F+) but lower strength below 1200°F and is more difficult to fabricate. 718 is preferred for fabricated structures.
- Inconel 718 vs. 17-4 PH stainless — 718 has dramatically better elevated-temperature strength and corrosion resistance. 17-4 PH is preferred when budget matters and service is below ~600°F.
- Inconel 718 vs. A286 — A286 is iron-based, lower cost, and useful to ~1200°F. 718 has higher strength and a better service ceiling for rotating engine parts.
Why Source 21?
- ISO 9001-certified quality system with full chemistry and mechanical traceability on every shipment
- Multi-million dollar national inventory across stainless, nickel alloys, copper, and brass
- Strong domestic and international mill relationships, including premium specialty mill partnerships
- In-house slitting, edging, leveling, and cut-to-length capabilities
- Contract programs, blanket orders, and vendor-managed inventory (VMI) for production accounts
- Responsive technical support for tight-tolerance and certification-driven work
Request a Quote
Contact Source 21 today for Inconel 718 pricing, availability, and processing options. Our team responds quickly, asks the right questions, and gets you accurate quotes on real material — not vague placeholders.
Call 631-821-1101 or request a quote online to get started.
Founded in 1990 Source 21 is a leading distributor and processor of stainless steel, copper and brass products.
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