718 Nickel Alloy - Inconel® 718 - AMS 5662 - UNS N07718

Nickel Alloy 718, frequently called Inconel® 718, is a precipitation hardenable corrosion and heat-resistant nickel alloy available in bars, forgings, sheets and plates. AMS 5662 and AMS 5663 limit sizes 10” and less between parallel sides with maximum cross-section area of 78 in2 for bars and finished forgings. It is a multiple melted alloy including VIM and/or VAR processes.

Inconel 718 Round Bar
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The alloy has high strength and creep rupture properties up from cryogenic temperatures to 1300° F, along with corrosion resistance and weldability with resistance to cracking. Nickel Alloy 718 has good resistance to oxidation and corrosion at temperatures and atmospheres in jet engine and gas turbine operations. It is also corrosion resistant to acids, sea water and sour oil and/or gas.

Inconel®718 Nickel Applications:

Nickel Alloy 718 aerospace applications are jet engines, rocket motors, spacecraft, and fasteners. It is also used in oil and gas applications such as logging tools, pump shafts, fishing tools, and wellhead components.

Common Trade Names:

  • Nickel 718
  • Inconel® 718
  • Alloy 718
  • ATI 718
  • ATI 718Plus®
  • Pyrowear® 718
  • Nicrofer 5219 Nb
  • DIN 2.4668
  • W-Nr 2.4668 (Werkstoff Number)

Common Specifications:

  • AMS 5662 Bars, Forgings, Rings
  • AMS 5663 Bars, Forgings, Rings
  • AMS 5664
  • AMS 5596 Sheet, Plate, Strip
  • AMS 5597 Sheet, Plate, Strip
  • AMS 5441 718Plus® ATI
  • ASTM B637
  • ASME SB-637
  • UNS N07718
  • B50T69
  • B50TF15
  • C50TF13
  • DMD 424.22
  • EMS 55446
  • EMS 55476
  • EMS 52503
  • NACE MR0175 (Oil & Gas)
  • API 6A718 (Oil & Gas)
  • ISO 9723

Stocked Sizes:

  • Rounds: Rough Turned, Solution Treated Condition (Annealed)
    • 38 Diameters 0.500" through 8"

Fabrication


Forging2050° F max for hot-working. Hot-cold working from 1700/1850° F
MachinabilityCan be machined in either annealed or age-hardened condition
WeldingWeldable in either the annealed or age-hardened condition

Physical Properties:


  • Density: 0.296 #/in3 Solution Treated condition (Annealed)
  • Density: 0.297 #/in3 Precipitation Hardened condition

AS9100 Mill Producers:


  • ATI Specialty Materials
  • Carpenter Technology Corp
  • Special Metals Corp
  • VDM Metals USA

Heat Treatment


TypeProcess
Solution Treatment1700°- 1850° then air cool
Precipitation Hardening1325° F for 8 hours, furnace cool to 1150° F

Chemical Composition:


SymbolElementMin %Max %
CCarbon-0.08%
MnManganese-0.35%
SiSilicon-0.35%
PPhosphorus-0.015%
SSulfur-0.015%
CrChromium17.00%21.00%
NiNickel50.00%55.00%
MoMolybdenum2.80%3.30%
Cb (Nb)Columbium (Niobium)4.75%5.50%
TiTitanium0.65%1.15%
AlAluminum0.20%0.80%
CoCobalt-1.00%
BBoron-0.006%
CuCopper-0.30%
PbLead-0.0005% (5 ppm)
BiBismuth-0.00003% (0.3 ppm)
FeIronremainder-

Minimum Tensile Properties at Room Temperature:


Sample Orientation per Diameter or Least Distance between Parallel Sides Tensile StrengthYield Strength 0.2% OffsetElongation in 4DReduction of Area
Longitudinal
Size 10” and under
185 ksi150 ksi12%15%
Long Transverse
Forgings 5” and under
180 ksi150 ksi10%12%
Long Transverse
Forgings Over 5” & ≤ 10”
180 ksi145 ksi10%12%
Transverse
Bars 5” and under
180 ksi150 ksi6%8%
Transverse
Bars Over 5” & ≤ 10”
180 ksi145 ksi6%8%

* Precipitation Heat Treated per AMS 5662 Paragraph 3.5.1.2

Tensile Properties at 1200°F:


Sample Orientation per Diameter or Least Distance between Parallel Sides Tensile StrengthYield Strength 0.2% OffsetElongation in 4DReduction of Area
Longitudinal
Size 5” and under
145 ksi125 ksi12%15%
Longitudinal
Size over 5% and ≤ 10”
145 ksi122 ksi12%15%
Long Transverse
Forgings 5” and under
140 ksi125 ksi10%12%
Long Transverse
Forgings Over 5” & ≤ 10”
140 ksi122 ksi10%12%
Transverse
Bars 5” and under
140 ksi125 ksi6%8%
Transverse
Bars Over 5” & ≤ 10”
140 ksi122 ksi6%8%

* Precipitation Heat Treated per AMS 5662 Paragraph 3.5.1.2
* Samples at 1200° F per AMS 5662 Paragraph 3.5.1.2.1.2

Inconel is a registered trademark of Special Metals Corporation.

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