718

UNS #N07718

718 is a precipitation hardenable nickel-base alloy designed to display exceptionally high yield, tensile, and creep-rupture properties at temperatures up to 1300°F (704°C). It is resistant chlorides, stress corrosion, and sulfide stress cracking and the sluggish age-hardening response of 718 permits annealing and welding without spontaneous hardening during heating and cooling, providing excellent weldability when compared to the nickel-base superalloys hardened by aluminum and titanium.

Type Analysis

  • Carbon (Maximum) 0.08
  • Phosphorus (Maximum) 0.015
  • Silicon (Maximum) 0.35
  • Titanium (Nominal) 0.65 - 1.15
  • Manganese (Maximum) 0.35
  • Sulfur (Maximum) 0.015
  • Chromium (Nominal) 17.00 - 21.00
  • Cobalt (Nominal) 1
  • Molybdenum (Nominal) 2.80 - 3.30
  • Iron (Nominal) Balance
  • Aluminum (Nominal) 0.35 - 0.80
  • Copper (Nominal) 0.15
  • Columbium + Tantalum4.75 - 5.50
  • Boron (Nominal) 0.001 - 0.006
  • Nickel + Cobalt (Nominal) 50.00 - 55.00

Applications

Jet engine and high-speed airframe parts such as wheels, buckets, spacers, and high temperature bolts and fasteners; oil and gas drilling valves, tubing hangers, MWD/LWD parts, fishing tools, pump shafts and wellhead components.

Applicable Specifications

  • AMS 5662
  • API 6A718
  • AMS 5663
  • NACE MR0175

Billet

Rod

Rounds

Shapes

Strip

Wire

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