NeoNickel

Alloy 718

A precipitation-hardenable nickel-chromium grade, Alloy 718, often referred to as Inconel® 718, is a high strength superalloy used at temperatures up to 648°C.

Characteristics of Alloy 718

Alloy 718, also referred to as Inconel® 718 (a registered trademark of Special Metals Corporation), is a precipitation-hardenable nickel-chromium alloy engineered for exceptional mechanical strength and corrosion resistance in extreme environments. With the addition of niobium, molybdenum, titanium, and aluminium, Alloy 718 maintains outstanding tensile, yield, and creep-rupture strength at temperatures up to 648°C (1200°F).

Its excellent weldability, resistance to post-weld cracking, and stable long-term performance under high stress and corrosive conditions make Alloy 718 a trusted choice for mission-critical applications. NeoNickel supplies Alloy 718 in a variety of forms and conditions — including annealed material to facilitate machining, followed by appropriate heat treatments to achieve optimal strength levels.

  • Exceptional tensile, yield, and creep-rupture strength up to 648°C (1200°F).
  • Excellent corrosion and oxidation resistance in extreme environments.
  • Outstanding weldability and resistance to post-weld cracking.
  • Long-term mechanical stability under high stress and elevated temperatures.
  • UNS Number: N07718
  • Werkstoff Number: 2.4668
  • ASTM: B637, B670
  • AMS: 5596, 5662, 5663, 5832

Product availability

We supply Alloy 718 in a range of product forms to meet diverse engineering needs:

Coil
Plate
Round Bar
Sheet
Welding Wire

Our expert team can assist with custom sizing, machining, and material certification for your specific requirements.

Chemical analysis

%Ni+CoCrMoCuCoCMnSiPSFeTiAlNb+TaB
Min50172.80000000Balance0.650.24.750
Max55213.30.310.080.350.350.0150.015Balance1.150.85.50.006

Mechanical & Physical Properties

Mechanical & Physical Properties-196°C21°C93°C204°C316°C538°C649°C760°C
Coefficient of Thermal Expansion µm/m⁰C10.62-13.113.513.914.615.116
Thermal Conductivity /kcal/(hr.m.°C)-9.510.712.213.816.818.319.8
Modulus of Elasticity / x105 MPa-21.931.861.791.721.651.52

Typical Room Temperature Properties, 982°C

135Ultimate tensile strength, ksi
700.2% yield strength, ksi
45Elongation, %
100Hardness, Rockwell B

Average Tensile Properties, ½” Bar Annealed 982°C

Temperature, °C21°C204°C427°C538°C649°C760°C
Ultimate Tensile Strength, ksi210198191185168111
0.2% Yield Strength, ksi175163156155149110
Elongation, %222019181927
Hardness, Rockwell C42-44--40-4140-4133-34

Typical Stress Rupture, Bar, Annealed 982°C

593°C649°C704°C760°C
100 Hours, ksi1701107544
1,000 Hours, ksi130855525

Applications of Alloy 718

With its combination of strength, toughness, and corrosion resistance, the versatility of Alloy 718 is ideal for:

  • Gas turbine engine parts
  • Liquid fuel rocket motor components
  • Springs, fasteners
  • Cryogenic tanks
  • Pumps and valves
  • Tooling

Benefits of Alloy 718

Alloy 718 offers a unique combination of mechanical strength, corrosion resistance, and fabrication flexibility, providing critical advantages across aerospace, energy, marine, and industrial sectors.

  • Exceptional High-Temperature Strength: Maintains mechanical integrity at temperatures up to 648°C (1200°F), ensuring reliable performance and reducing the risk of material failure in demanding high-heat environments.
  • Outstanding Corrosion and Oxidation Resistance: Protects components exposed to harsh chemicals and extreme conditions, extending service life and lowering replacement costs.
  • Excellent Weldability: Reduces the risk of post-weld cracking, simplifying manufacturing processes and enabling more efficient fabrication.
  • Proven Versatility Across Industries: Suitable for aerospace, energy, marine, and high-performance engineering applications, offering flexibility for a wide range of critical projects.
  • Long-Term Mechanical Stability: Delivers consistent strength and toughness over prolonged service periods, minimising maintenance requirements and ensuring operational reliability.

Alloy 718’s balance of strength, corrosion resistance, and weldability makes it the ideal material for mission-critical components operating under extreme conditions. For more advice or a quote, contact our team today.

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Looking for high-quality Alloy 718 suppliers? NeoNickel offers extensive stock, fast turnaround, and precision services. Get a Quote or speak with one of our experts

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