Alloy 718 Round Bar, Plate, Sheet and Coil - AMS 5596, 5662, N07718
Inconel® 718 is a high‑performance, precipitation‑hardening nickel‑chromium alloy engineered for demanding applications that require exceptional strength, heat resistance, and corrosion resistance. Featuring significant levels of iron, columbium (niobium), and molybdenum—with additional aluminum and titanium for strengthening—Inconel 718 offers outstanding weldability, formability, and cryogenic toughness compared to other nickel‑based superalloys.
This non‑magnetic alloy maintains superior resistance to corrosion, oxidation, creep, and stress rupture at elevated temperatures. Inconel® 718 delivers reliable performance with high strength and excellent ductility up to 1300°F (704°C) and provides oxidation resistance up to 1800°F (982°C), making it a top choice for critical aerospace, energy, and high‑temperature industrial applications.
- Inventory & Specs
- Chemical Composition
- Physical Properties
- Mechanical Properties
- Datasheet
- Additional Info
- FAQs
Inventory Size Ranges for 718
| Type | Thickness | AMS Standards | ASTM | UNS | ASME | Get a Quote |
|---|---|---|---|---|---|---|
| Coil | 0.020" - 0.160" | AMS 5596 | ASTM B 670 | UNS N07718 | ASME SB 670 | Get a Quote |
| Sheet | 0.020" - 0.160" | AMS 5596 | ASTM B 670 | UNS N07718 | ASME SB 670 | Get a Quote |
| Plate | 0.1875" - 2.000" | AMS 5596 | ASTM B 670 | UNS N07718 | ASME SB 670 | Get a Quote |
| Bar | 0.250" - 10.000" | AMS 5662 | ASTM B 637 | UNS N07718 | Get a Quote | |
| Precision Reroll Strip | 0.0008" - 0.015" | Get a Quote |
Advanced Inventory Size Ranges for 718
| Type | Size Range | Specifications | Get a Quote |
|---|---|---|---|
| Build Platform | 0.500" - 5.000" | AMS 5596, ASTM B 670, UNS N07718, ASME SB 670 | Get a Quote |
| Feedstock | 1.37" - 5.90" | AMS 5662 / AMS 5663, ASTM B637, N07718 | Get a Quote |
| Powder | 15um - 106um | AMS 5662, AMS 5664, ASTM F3055, UNS N07718 | Get a Quote |
Characteristics of Inconel 718
Inconel® 718 is known for its exceptional tensile strength, impact strength, and long‑term performance in high‑temperature environments. This nickel‑based superalloy provides excellent resistance to oxidation and corrosion within its usable strength range, making it ideal for harsh operating conditions such as those found in jet engines, gas turbines, and other high‑heat industrial systems.
Working with Inconel 718
Inconel® 718 offers outstanding workability compared to many other high‑strength alloys. It supports repair welding—even in the aged condition—and is typically supplied in the solution‑treated state for optimal processing. Thanks to its slow precipitation‑hardening response, Alloy 718 can be welded without the risk of rapid hardening or cracking, making it a preferred material for complex, high‑precision manufacturing applications.
Other industry standards we comply with:
- PWA-LCS
- DFARS Compliant
- RR SABRe Edition 2
- GE Aircraft Engine (GT193)
- GE Aviation S-SPEC-35 AeDMS S-400
- EN 2.4668
- EN 10204
Common Trade Names
- Haynes 718 (® Haynes International)
- ATI 718 (™ Allegheny Technologies)
- Inconel Alloy 718 (® Special Metals)
- INCONEL® Alloy 718 (Haynes)
Industry Applications for 718
- Jet Engine
- Gas Turbine Operations
- Base Plates
- Rotor Bolts (Power Generation)
- Burst Discs
Chemical Composition
| Element | Min | Max | |
|---|---|---|---|
| C | Carbon | - | 0.008 |
| Mn | Manganese | - | 0.35 |
| P | Phosphorus | - | 0.015 |
| S | Sulfur | - | 0.015 |
| Si | Silicon | - | 0.35 |
| Cr | Chromium | 17.00 | 21.00 |
| Ni | Nickel | 50.00 | 55.00 |
| Mo | Molybdenum | 2.80 | 3.30 |
| Nb | Columbium | 4.75 | 5.50 |
| Ti | Titanium | 0.65 | 1.15 |
| Al | Aluminum | 0.20 | 0.80 |
| Co | Cobalt | - | 1.00 |
| B | Boron | - | 0.006 |
| Cu | Copper | - | 0.30 |
| Ta | Tantalum | - | 0.05 |
| Fe | Iron | - | Balance |
Physical Properties
| Property | Value |
|---|---|
| Electrical Resistivity | 68°F (20°C) |
| Annealed | 127 microhm-cm |
| Aged | 121 microhm-cm |
| Property | Annealed Condition | Aged Condition |
|---|---|---|
| Density | 0.296 lb./in3 (8.19 g/cm3) | 0.297 lb./in3 (8.22 g/cm3) |
| Specific Gravity | 8.19 | 8.22 |
| Temperature Range | Coefficients | ||
|---|---|---|---|
| °C | °F | W/m·K | Btu/(hr/ft²/in/°F) |
| 0-100 | 32-212 | 6.5 | 11.2 |
Mechanical Properties
Typical Short Time Tensile Properties as a Function of Temperature
- Solution Treatment: 1800°F (982°C) 1 hour
- Precipitation Treatment: 1325°F (718°C) 8 hours, Furnace Cool at 100°F (55°C) per hour to 1150°F (621°C) 8 hours
Inconel 718 machining often results in less tool life due to the work hardening and abrasion properties of the alloy. High cutting pressure and temperature also contributes towards work hardening, surface tearing, and deformation.
| Product | Yield Strength Max (0.2% offset) | Ultimate Tensile Strength Max | Elongation (% in 2") |
|---|---|---|---|
| Sheet & Strip | 80,000 psi (550 MPa) | 14,000 (965 MPa) | 30 (min) |
| Plate | 105,000 psi (725 MPa) | 150,000 (1,035 MPa) | 30 (min) |
| Yield Strength Max (0.2% offset) | Ultimate Tensile Strength Min | Elongation (% in 2") |
|---|---|---|
| 150,000 (1,035 MPa) | 180,000 (1,240 MPa) | 12 (min) |
Datasheet
Additional Info
A Brief History of Inconel® 718
Inconel® 718 is one of the world’s most important nickel‑based superalloys, first patented in 1962 and engineered for exceptional strength, heat resistance, and long‑term durability. Originally developed as an evolution of the Ni‑Cr‑Mo superalloy family that produced Inconel® 625, Alloy 718 quickly became essential for extreme‑temperature environments such as jet engines, gas turbines, and high‑pressure power systems. Its unique combination of weldability, creep resistance, and high‑temperature performance helped establish it as a leading aerospace alloy—used extensively today in engines, turbines, and heat‑exchange systems.
How Inconel® 718 Was Developed
During the 1950s, researchers sought a material that could withstand supercritical steam pressures in power plants—one that offered excellent weldability, stable creep resistance, and the ability to be formed into complex tubing. When early age‑hardening tests on Inconel® 625 samples revealed an opportunity for even higher performance, the foundation for Alloy 718 was created. By optimizing the balance of nickel, niobium, molybdenum, titanium, and aluminum, metallurgists produced a breakthrough superalloy with superior strength, excellent fabrication characteristics, and outstanding high‑temperature stability.
Early Applications of Inconel® 718
Although early vacuum‑processing limitations made initial production challenging, Inconel® 718’s mechanical advantages quickly made it indispensable. One of its first major applications was in the diffuser case of the J‑58 engine powering the SR‑71 Blackbird in 1963. Capable of withstanding temperatures up to 1,250°F, Alloy 718 dramatically improved reliability and performance in next‑generation jet engines—reinforcing its value in aerospace and defense applications.
How Inconel® 718 Is Used Today
Today, Alloy 718 represents nearly half of all superalloy production worldwide. Its exceptional resistance to heat, corrosion, and stress makes it foundational in gas turbine power systems, where it can account for up to 30% of an engine’s total weight. In aerospace, Inconel® 718 is used in compressor blades, turbine discs, rings, casings, fasteners, and structural components. Its strength at cryogenic temperatures also makes it ideal for space applications and liquid‑gas storage systems—such as liquid‑nitrogen containment at −196°F. Few materials offer such a broad operating range with consistent mechanical performance.
Your Trusted Supplier for Inconel® 718
United Performance Metals is a global specialty metals solutions provider supplying premium Inconel® 718 in round bar, plate, sheet, and precision‑processed forms. We support major aerospace, energy, and industrial manufacturers with high‑quality material, value‑added processing, and dependable supply chain solutions. Contact our team today to learn how we can support your next high‑performance application.
Product FAQs
Inconel® 718 is a precipitation‑hardening nickel‑chromium superalloy known for its high strength, excellent corrosion resistance, and exceptional performance at elevated and cryogenic temperatures.
Aerospace, defense, space, oil & gas, power generation, alternative energy, automotive motorsports, medical, and cryogenic applications all rely on Alloy 718 for its durability and heat resistance.
Turbine blades, jet engine components, rocket engine parts, fasteners, gas‑turbine disks, heat‑exchange systems, pump shafts, cryogenic tanks, and high‑stress structural components.
Alloy 718 provides significantly higher strength due to precipitation hardening, while Alloy 625 is valued for superior corrosion resistance but lower strength at high temperatures.
Yes. It offers excellent resistance to oxidation, pitting, crevice corrosion, and stress‑corrosion cracking in high‑temperature or chemically aggressive environments.