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Inconel 718 Alloy - INCONEL® ALLOY7718

INCONEL 718 Sheets,Plates & Roundbars Available

INCONEL®ALLOY7718,UNS Number N07718,
Other Most common names: Alloy 718

INCONEL® alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F. Typical composition limits are shown in Table 1. The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding.

Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments subjected to pressure and heat. When heated, Inconel forms a thick, stable, passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, attractive for high temperature applications where aluminum and steel would succumb to creep as a result of thermally induced crystal vacancies. Inconel’s high temperature strength is developed by solid solution strengthening or precipitation hardening, depending on the alloy.

Alloy 718 is a precipitation hardenable nickel-based alloy designed to display exceptionally high yield, tensile and creep-rupture properties at temperatures up to 1300°F. The sluggish age-hardening response of alloy 718 permits annealing and welding without spontaneous hardening during heating and cooling.

This alloy has excellent weldability when compared to the nickel-base superalloys hardened by aluminum and titanium. This alloy has been used for jet engine and high-speed airframe parts such as wheels, buckets, spacers, and high temperature bolts and fasteners.

characteristics of Inconel 718

  • Good mechanical properties – tensile, fatigue and creep-rupture
  • Yield tensile strength, creep, and rupture strength properties are exceedingly high
  • Highly resistant to chloride and sulfide stress corrosion cracking
  • Resistant to aqueous corrosion and chloride ion stress corrosion cracking
  • High temperature resistant
  • Age-hardenable with a unique property of slow aging response that permits heating and cooling during annealing without the danger of cracking.
  • Excellent welding characteristics, resistant to postweld age cracking

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