Inconel 718

Inconel®
718

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Inconel 718 is one of the most popular nickel alloys due to its versatility. Known for its high strength and corrosion resistance, Inconel 718 is ideal for numerous applications and products.

Available in bar stock form, Premium Alloys stocks Inconel 718 in 3 conditions: AMS 5662, AMS 5663, and NACE MR0175 (API 6A CRA).

Ideal for high temperature applications

Ideal for high temperature applications

Superior formability and weldability

Superior formability and weldability

excellent corrosion resistance, toughness and strength

excellent corrosion resistance, toughness and strength

What Is Inconel® 718?

Inconel 718 is a high strength nickel alloy with the capability to be precipitation hardened, which helps keep its resistance, strength, oxidation, and ductility while in the most extreme environments.

This performance must be kept constant during long periods at high temperatures, which is fulfilled by the Inconel series. Inconel 718 bar stock is used in many industries including aerospace, oil and gas, chemical, and valves for critical applications.

Available Forms of Inconel® 718 From Premium Alloys

Premium Alloys offers Inconel 718 in bar stock form, providing customers with readily available material for their machining needs. Our extensive inventory ensures prompt delivery and reliable supply of Inconel 718 bar stock in various conditions to meet your specific requirements.

Benefits of Inconel® 718

Due to its exceptional strength and resistance to extreme temperatures, Inconel 718 is an ideal choice for complex components that must retain their integrity in demanding conditions. Some of the many advantages of using the alloy 718 Inconel include the following:

Very Versatile

With its unique combination of properties, Inconel 718 is a great choice for numerous applications, from petrochemical to aerospace. It has good weldability and high resistance to oxidation and stress corrosion cracking.

High Mechanical Strength

Inconel 718 is stronger than other alloys, allowing it to be used in high-temperature environments as well as under pressure. It features an age-hardened tensile strength of 185- 220 ksi, which is roughly twice as strong as its sister alloy, Inconel 625.

Stable in Extreme Environments

From cryogenic temperatures to 1400°F, Inconel 718 remains stable, demonstrating exceptional tensile and impact strength even when exposed to harsh conditions. It also has very low thermal expansion and is resistant to oxidation and corrosion, making it a great option for industries like aerospace, power plants, oil and gas, and more.

Resistant to Corrosion and Thermal Shock

Inconel 718 has beneficial protection to atmospheric decay and corrosion at climates within the nickel alloys strength space. It has somewhat-favorable weldability, formability, and exceptional low temperature properties comparable to other PH nickel alloys.

NACE MR0175 Resistance

In the NACE MR0175 form, Inconel 718 has a required minimum yield strength of 120 KSI. It is processed differently than the AMS conditions to enhance its corrosion resistance in downhole tools and completion components.

AMS5663 Resistance

AMS 5663 has a minimum yield strength of 150 KSI which makes it suitable for applications that require intense strength in both the aerospace and oil & gas industries.

Inconel® 718Composition

Inconel 718 is an age-hardenable nickel alloy
with high strength and corrosion resistance.

Properties of Inconel® 718

Inconel 718 has several properties that make it an ideal choice for many applications, such as its high tensile strength, excellent oxidation and corrosion resistance, good weldability, and low thermal expansion. It also has a range of mechanical properties that depend on the heat treatment used to produce it.

The following table outlines some of the most important physical properties of Inconel 718:

Physical Properties

Condition Tensile Yield Enlongation Reduction of Area Hardness
NACE 150KSI 120KSI 20% 35% 32-40 HRC
AMS5663 185KSI 150KSI 12% 15% 331 BHN min

Material properties of Inconel 718 include the following:

Density

8.19 g/cc or 0.296 lb/in³

Thermal Conductivity

Up to 10.3 W/m·k

Hardness

NACE: 40 HRC Max or 45 HRC Max, depending on the application and specification callout AMS: 331 HB min

Yield Strength

NACE: 120 KSI min yield or 150 KSI Min yield, depending on the application and specification callout AMS: 150 KSI min yield

Melting Point Range

2200-2450°F or 1210/1344 °C

Elasticity

The Inconel 718 modulus of elasticity allows this alloy to be more flexible than other materials, making it more suitable for certain applications.

How Does Inconel® 718
Stack Up Against Other
Metals?

Inconel 718 is a high-performance, heat-resistant superalloy that can stand up to extreme temperatures and environments. Other alloys (and grades of Inconel) may have different properties due to their composition, but 718 is known for its strength and versatility.

Compared to other metals like stainless steel or aluminum, Inconel 718 offers greater temperature resistance and higher hardness levels.

Inconel 625 vs 718

Inconel 718 and Inconel 625 share some properties, but Inconel 625 is primarily nickel-based while 718 combines nickel and cobalt. Inconel 625 has less iron but more chromium and molybdenum than the 718 alloy.

Beyond their differences in composition, Inconel 625 and Inconel 718 are also best suited for different applications. In general, Inconel 625 is comparatively better for corrosion resistance while Inconel 718 has higher strength.

Inconel 718 vs Stainless Steel 316

The biggest differences between 718 Inconel and 316 stainless steel is in corrosion resistance and strength at high temperatures; in both of these areas, Inconel 718 will outperform the stainless steel 316 alloy. Inconel alloys also resist oxidation and scaling.

However, Inconel 718 tends to come at a higher price point, as well, but for optimal corrosion resistance and strength, the investment is worthwhile.

Inconel® 718 Industries

Inconel 718 is an incredibly versatile superalloy, available in bar stock form, and is used in a variety of industries that require strength, temperature resistance, and corrosion resistance. This alloy is often utilized for components like valves and connectors that are exposed to high-pressure fluids or gases in industries such as the following:

Aerospace

Inconel 718 has been used in many applications within the aerospace industry due to its light weight, high-temperature resistance and excellent corrosion resistance. It is often used for aircraft engine parts such as turbine blades, exhaust systems and manifolds as well as other engine components like Inconel 718 bolts, valve bodies, and nuts.

Oil and Gas

Because of its high tensile strength and corrosion resistance, Inconel 718 is an ideal material for oil and gas applications. It is often used in downhole tools, valves and flanges as well as other components exposed to extreme temperatures or corrosive environments.

Chemical and Petrochemical Plants

In chemical and petrochemical plants, Inconel 718 is often used in valves, pumps, and other components that require high strength at elevated temperatures. It also offers good corrosion resistance to many chemicals, acids and solvents making it an ideal choice for these applications.

Power Plants

Inconel 718 is often used in power plants due to its high strength and corrosion resistance. It is often chosen for components that are exposed to high temperatures such as turbine blades, bearings, valve bodies, nuts, and bolts.

Inconel® 718
Uses

This versatile alloy is used in many different applications, from aircraft engine parts to medical implants. Some of the most common uses for machining Inconel 718 include:

  • Fasteners
  • Wire
  • Turbines
  • Pipes
  • Sheets
  • Oil tubes
  • Plates
  • Gaskets
  • Bolts
  • Springs
  • Tig rods
  • Disc rings
  • Filaments
  • Mesh
  • Round bars
  • Machined part

Frequently Asked Questions

Is Inconel 718 Magnetic?

Inconel 718 is non-magnetic.

Is Inconel 718 Difficult to Machine?

Inconel 718 can be a challenging material to machine, due to its high strength and hard surface, but these properties also make it ideal for many applications. With the right tools and techniques, it can be machined successfully.

It is important to keep in mind that Inconel 718 has a fairly low thermal conductivity, so higher cutting speeds and feed rates can help minimize heat build-up during machining.

What Is the Price of Inconel 718?

For pricing of 718 Inconel, please contact us for a quote so that we can provide you with the most accurate pricing information for your needs. Prices vary due to the market, quantity ordered, and other factors.





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SIZES & LENGTHS
OD Size: 1/8” OD up to 24” OD
Lengths: 12’ r/l up to 25’ r/l

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