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Inconel 718

Nickel-chromium-molybdenum alloy Inconel 718 is designed to withstand a wide range of severely corrosive environments, as well as pitting and crevice corrosion. Inconel 718 is also resistant to high temperatures. At high temperatures, the yield, tensile, and creep-rupture properties of this nickel steel alloy are exceptionally high, as is its toughness.

As a high-strength nickel-chromium alloy with excellent corrosion resistance, Inconel 718 is still widely used in the aerospace industry, where it is found in the majority of aircraft engine components, as well as in other applications. Its superior strength and corrosion resistance have been recognised by the oil industry, and it is now widely used in this sector of the economy.This nickel alloy is used in a variety of applications at temperatures ranging from cryogenic to 1200 °F. Inconel 718's composition is distinguished by the addition of niobium, which allows for age hardening, which allows for annealing and welding without the formation of spontaneous hardening during the heating and cooling processes.

Characteristic :

  •  Nickel Chromium alloy
  •  Available in a variety of conditions
  •  High strength
  •  Excellent corrosion resistance
  •  Combination of excellent mechanical properties over a wide range of temperatures
  •  Outstanding weldability with resistance to post-weld cracking
  •  Excellent creep-rupture strength at temperatures up to 700°C (1300°F)
  •  Commonly referred to as Inconel® 718

Specification :

  •  ASTM B637
  •  UNS N07718
  •  API 6ACRA
  •  AMS 5662/5663
  •  NACE MR0175/ISO15156
  •  Werkstoff Nr. 2.4856
    Material may also be supplied to Customer specifications, subject to enquiry

Chemical Analysis :

Alloy 718 is hardened by the precipitation of secondary nickel- (aluminium, titanium, niobium) phases giving the alloy a combination of high strength and good corrosion resistance.
Chemical Composition of Alloy 718 for Aerospace:

C Mn Si P S Cr Ni Mo Nb + Ta Ti Ai Co B Cu Fe -
Min - - - - - 17.0 50.0 2.80 4.75 0.65 0.20 - - - Bal %
Max 0.08 0.35 0.35 0.015 0.015 21.0 55.0 3.30 5.50 1.15 0.80 1.0 0.006 0.30 - %

Mechanical Properties :

Type Tensile (PSI (MPA)) Yield (0.2% offset), (PSI (MPA) Min) Elongation in 2" or 4D min% Reduction of Area Hardness Charpy Impacts at - 60◦C (-76◦F) J (ft.lb)
API 6ACRA Oil Patch 150,000 (1034) 120,000 (827) 20 35 40 HRC Max 76.2mm dia: 61J (45) min/68J(50) Average
76.2mm to 254mm dia: 41J(30) min/ 47J (35) average
>254mm dia: 37J (27) min/41J (30) average
High Strength/ AMS Aerospace 185,000 (1275) 150,000 (1034) 12 15 331HB Min


    Typical applications in the oil industry and aerospace and power generation industries.

  • Valves
  • Choke stems
  • Fasteners
  • Tubing hangers and fire safe valves
  • Gas turbines
  • Aircraft engines
Work Process

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