Nickel Alloy Inconel 718 - Properties and Applications by United Performance Metals

Topics Covered

Background
Properties of Inconel 718
Chemical Composition of Inconel 718
Resistance to Corrosion and Oxidation of Inconel 718
Physical Properties of Inconel 718
Thermal Conductivity of Inconel 718
Mechanical Properties
Standards
Applications of Inconel 718

Background

United Performance Metals is a leading supplier of specialty stainless steel and high temperature alloys. In business since 1982, we have experience serving the needs of customers in diverse markets including aerospace, aircraft, automotive, medical, food service, house-wares, and many others.

United Performance Metals stocks a comprehensive inventory of stainless steel sheet, stainless steel coil and stainless steel plate. We are also specialists in high temperature and cobalt alloys including Inconel 625, Inconel 718, A-286, 188 Alloy and L605.

In addition to our comprehensive inventory, we also have complete in-house processing capabilities including leveling, shearing, slitting and edging. When you call, you’ll talk to experienced people who know their business, and yours. Make your life a little easier.

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 summarized in the table below.

 
Solution Treated
Solution Treated and Aged
Density
0.296 lb/in3 (8.192 g/cm3)
0.297 lb/in3 (8.22 g/cm3)
Specific Gravity
8.19
8.22
Melting Range
2500-2600°F
1370-1430°C

Thermal Conductivity of Inconel 718

The thermal conductivity at various temperatures for 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 alloy is substantially increased by precipitation heat treatment as the following data indicate. These values are properties specified for sheet, strip and plate in AMS 5596 and AMS 5597.

Yield Strength
Min
(0.2% offset)
Ultimate Tensile Strength
Min
Elongation
(% in 2")
Sheet and strip
80,000 psi (550 MPa)
14,000 psi (965 MPa)
30 (min)
Plate
105,000 psi (725 MPa)
150,000 psi (1,035 MPa)
30 (min)

Solution trated plus precipitation heat treated.

Yield Strength
Min
(0.2% offset)
Ultimate Tensile Strength
Min
Elongation
(% in 2")
150,000 (1,035 MPa)
180,000 psi (1,240 MPa)
12 (min)

Typical short time tensile properties of 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

United Performance Metals Inconel 718 is 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 United Performance Metals.

Source: United Performance Metals

For more information on this source, please visit United Performance Metals

Comments

  1. Venkat Yakatpure Venkat Yakatpure India says:

    Tensile and fatigue properties of Forged blink from IN 718 and comparision of vacuum cast CM247LC alloy.

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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