Nickel AlloysAlloy 718 Bar & Forgings

A precipitation-hardenable nickel chromium grade with extremely high strength.

Alloy 718 is an age-hardenable nickel-chromium-iron-molybdenum alloy with 50 to 55% nickel. Alloy 718 was initially developed for the aerospace industry and is still considered the material of choice for the majority of aircraft engine components. Its excellent strength and corrosion resistance have been recognised by the oil industry and it is now widely used in this field.

The age-hardening is achieved by specific additions of niobium, titanium and aluminium. The addition of Nb, Ti, Al and Ni form a series of precipitates during the controlled solution annealing and ageing process steps, resulting in a significant increase in strength and hardness compared with alternative nickel alloys. These tensile and creep rupture properties are maintained from cryogenic to elevated temperatures, making it suitable for applications between -250oC - 650oC.

Alloy 718 has extremely high strength, excellent creep-stress rupture strength and good corrosion resistance.

Material supplied in the solution annealed and hardened condition.

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Related Specifications

  • ASTM B637-18 UNS N07718
  • NACE MR0175/ISO 15156-3/API6A


Chemical Composition


  • Components for offfshore drilling equipment
  • Pump shafts
  • Specialist valves
  • Choke stems
  • Fasteners
  • Gas turbine engine parts
  • Liquid fuel rocket motor components
  • Springs, fasteners
  • Cryogenic tanks
  • Tooling
  • Aerospace components
  • Nuclear plant containment vessels
  • Wellhead components


  • Good processing properties in the solution annealed condition
  • Good strength/ductility properties from sub-zero temperatures to over 750°C
  • Goood mechanical short and long-term properties, and excellent fatigue strength in the age hardened condition
  • Excellent mechanical properties at low temperatures
  • Excellent resistance to stress corrosion cracking and pitting in chloride-containing media
  • Excellent resistance to stress corrosion cracking and sulphide stress cracking in sour (H2S-containing) oilfield environments
  • Non-magnetic and spark resistant
  • Excellent creep-rupture strength at temperatures up to 700C (1300F)
  • Outstanding weldability

Additional Information

Heat Treatment

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