Alloy 718: High Strength with Corrosion Resistance


Alloy 718 Background

Often referred to as Inconel® 718, this austenitic nickel based super alloy is designed primarily for strength in temperature extremes. A precipitation hardening alloy, Alloy 718 displays exceptionally high yield, tensile and creep-rupture properties at temperatures well below freezing up to and beyond 1300°F (704°C). As a specialty alloy, 718 has improved mechanical short and long-term properties vs. other nickel alloys, and great fatigue strength in the age hardened conditions.  Alloying material includes very specific mixtures of niobium, molybdenum, titanium, and aluminum to assist with performance properties, as well as precipitation hardening. A versatile solution, Alloy 718 is available in many forms and produces results in a range of extreme applications. 

Chemical Composition

Cb: 4.75-5.50%, Cr: 17.0-21.0%, Mo: 2.8-3.3%, Ni: 50.0-55.0%, Ti: 0.65-1.15%

Qualifying Specifications & Standards

Depending on the standards applied and the form of material, Alloy 718 can be specified through many of the following:

Standard Designation
EN 2.4668 - NiCr19FeNb5Mo3
ISO NiCr19Nb5Mo3
UNS N07718
AMS 5662, 5663
AWS/SFA 5.14


Designed for use where temperature stresses the performance of traditional nickel and stainless alloys, Alloy 718 maintains strength and corrosion resistance even as operating temperatures increase. Strength is maintained up to approximately 1300°F (704°C) and maintains effective corrosion resistance up to approximately 1800°F (980°C). This makes Alloy 718 a sought-after material for components used in aerospace, oil & gas recovery, and processing, as well as industrial and manufacturing applications that require heat for material processing. Common installations of Alloy 718 include:

  • Engine and machinery components
  • Gas turbine blades and other parts
  • Aerospace fasteners
  • High-temp filtration mesh
  • Refinery equipment
  • Cryogenic tanks, pumps, and valves
  • Liquid rocket components
  • Compressors and other high-pressure equipment

Alloy 718 can also be used for welding consumables, applied in high-strength aircraft components, and liquid rocket components involving cryogenic temperatures. Alloy 718 is selected for welding due to its superior resistance to post weld cracking. 

welding wire 4Availability & Forms

Alloy 718 is a stocked product. Lead times vary based on processing required to finished form, but raw material is available at many Central Wire locations. Central Wire makes Alloy 718 available in the following forms:

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