Alloy 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.

Talk to an expert Download PDF

Range Enquiry

To enquire about our range or your specific requirements, please contact your local service centre.

Related Specifications

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

Properties

Chemical Composition

Applications

  • 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

Characteristics

  • 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

Find your local Service Centre

An extensive UK network of Service Centres, backed up by a central distribution facility.

  • Experienced multi-product specialists

  • In-house state of the art processing facilities

  • Large fleet of bespoke delivery vehicles

RBL Truck Retouched