Inconel 718, also known as Alloy 718, with the UNS designation N07718 and W. Nr. 2.4668, is a high-strength, corrosion-resistant age hardenable nickel-chrome-iron-molybdenum alloy used at -423° to 1300°F, known for its exceptional mechanical properties at elevated temperatures. It exhibits excellent tensile, fatigue, creep, and rupture strength, making it suitable for use in demanding environments. This alloy also offers excellent resistance to corrosion, oxidation, and aqueous corrosion, further extending its applicability in various industries. Inconel 718 is commonly used in aerospace, gas turbine, and other high-temperature applications where a combination of high strength and corrosion resistance is required.
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sales@cocessalloys.comChemical Composition
|
Nickel (Ni) |
50-55% |
|
Chromium (Cr) |
17-21% |
|
Iron (Fe) |
remainder |
|
Niobium+Tantalum (Nb+Ta) |
4.75-5.50% |
|
Molybdenum (Mo) |
2.8-3.3% |
|
Titanium (Ti) |
0.65-1.15% |
|
Aluminum (Al) |
0.2-0.8% |
|
Cobalt (Co) |
1.0 % max |
|
Manganese (Mn) |
0.35% max |
|
Silicon (Si) |
0.35% max |
|
Phosphorus (P) |
0.015% max |
|
Sulfur (S) |
0.015% max |
|
Carbon (C) |
0.08% max |
|
Boron |
0.006 max |
|
Copper (Cu) |
0.3% max |
Physical Properties
|
Density |
lb/in3 |
|
|
Annealed |
0.296 |
|
|
|
Annealed and Aged |
0.297 |
|
Melting Range |
°F |
2300-2437 |
|
|
°C |
1260-1336 |
|
Specific Heat at 70°F |
Btu/lb °F (at 21°C, J/kg °C) |
0.104 (435) |
|
Curie Temperature |
°F (°C) |
|
|
Annealed Material |
<-320 (<-196) |
|
|
|
Annealed and Aged Material |
-170 (-112) |
|
Permeability at 200 oersted and 70°F |
|
|
|
Annealed Material |
1.0013 |
|
|
Annealed and Aged Material |
1.0011 |
Mechanical Properties
|
Temperature |
Yield strength |
Tensile strength |
Elongation |
Reduction of area |
|||
|
Rp 0.2 |
Rm |
A |
Z |
||||
|
°C |
°F |
MPa |
ksi |
MPa |
ksi |
% |
% |
|
20 |
68 |
1030 |
149.4 |
1280 |
185.6 |
12 |
15 |
Inconel 718 is utilized in a wide range of applications across various industries due to its exceptional properties. Some typical applications include:
1. Aerospace: Components such as turbine discs, compressor blades, and other critical parts in aircraft engines benefit from Inconel 718's high strength, corrosion resistance, and ability to withstand high temperatures.
2. Gas turbine engines: Inconel 718 is used in the manufacturing of gas turbine components, including turbine wheels, seals, and combustion chambers, where high-temperature performance and resistance to corrosion are essential.
3. Oil and gas industry: It finds applications in downhole and wellhead components, as well as in equipment for sour gas environments, due to its resistance to corrosion and high-strength properties.
4. Nuclear reactors: Inconel 718 is employed in the construction of reactor core components and other critical parts in nuclear reactors due to its high-temperature strength and resistance to corrosion.
5. Chemical processing: It is used in equipment for chemical processing, such as valves, pumps, and fasteners, where resistance to corrosion and high temperatures is crucial.
6. Automotive and industrial gas turbines: Inconel 718 is utilized in turbocharger rotors, exhaust systems, and other high-temperature components in automotive and industrial gas turbine applications.
Specifications for Inconel 718 include the following:
|
Bar, Rod, wire and Forgings |
Seamless Pipe and Tube |
Plate, Sheet, and Strip |
|
ASTM B 637/ASME SB 637 |
ASTM B 983 / ASME SB 983 |
ASTM B 670/ASME SB 670, ASTM B 906/ASME SB 906 |
Standard product forms of Inconel 718 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at sales@cocessalloys.com for full information.
