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Nickel Alloy Inconel 718

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Properties of Inconlel 718

Inconel 718 is a nickel-based super alloy that is well suited for applications requiring high strength in temperature ranges from cryogenic up to 1400°F. Inconel 718 also exhibits excellent tensile and impact strength.

Chemical Composition of Inconel 718

Typical chemical analysis of Inconel 718.

Element
Percentage
Carbon
0.08 max
Manganese
0.35 max
Phosphorus
0.015 max
Sulfur
0.015 max
Silicon
0.35 max
Chromium
17-21
Nickel
50-55
Molybdenum
2.80-3.30
Columbium
4.75-5.50
Titanium
0.65-1.15
Aluminum
0.20-0.80
Cobalt
1.00 max
Boron
0.006 max
Copper
0.30 max
Tantalum
0.05 max
Iron
Balance

Resistance to Corrosion and Oxidation of Inconel 718

Inconel 718 has good resistance to oxidation and corrosion at temperatures in the alloy’s useful strength range in atmospheres encountered in jet engines and gas turbine operations.

Physical Properties of Inconel 718

Typical physical properties of Inconel 718 are given in the following table.

Temperature Range
Co-Efficients
°C
°F
W/m.K
Btu.ft/ft2.hr.°F
0-100
532-212
6.5
11.2

Mechanical Properties

The room temperature strength of the Inconel 718 as a function of temperature are shown here for material solution treated and aged as follows:

  • 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

Standards

Inconel 718 supplied to AMS 5596/5597 and has a UNS designation N07718.

Applications of Inconel 718

 Inconel 718  is typically used for:
  • Jet engine
  • Gas turbine operations

For sizes and availability of  Inconel 718 contact HT PIPE.