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Nickel Alloy 718/ Inconel 718®


Technical Data Sheet

 

Chemical Composition Limits
Weight % C Mn P S Si Cr Ni Mo Cb Ta Ti Al Co B Cu Fe
Alloy 718
AMS 5662
0.08 0.35 0.015 0.015 0.35 17-21 50-55 2.8-3.30 4.75-5.50 0.05 0.65-1.15 0.20-0.80 1.00 0.006 0.30 Rem

Alloy 718 (UNS N07718, W Nr 2.4668) is an austenitic nickel-based superalloy. Alloy 718 exhibits excellent high yield tensile and creep-rupture properties at temperatures up to 1300ºF and oxidation resistance to 1800ºF. Alloy 718 is used in applications that require high strength such as parts for jet engines and high speed airframe parts such as wheels, buckets, spacers and high temperature bolts and fasteners.

Typical Mechanical Properties

There are two main types of solution annealed and aging treatments:
1)
Solution Treatment (AMS 5662 Bar / AMS 5596 Sheet): 1725°F - 1850°F + Air Cool.
Heat Treatment (AMS 5663 Bar) : 1325°F for 8 hrs, cooling 100°F/hr to 1150°F, hold at 1150°F for 8hrs min, + Air Cool .

This treatment gives the highest room temperature tensile and yield strengths as well as producing the highest fatigue strength. It is the optimum heat treatment for Alloy 718 where a combination of rupture life, notch rupture life and rupture ductility is required.

2)
Alternative Solution Treatment (AMS 5664 Bar / AMS 5597 Sheet): 1900°F - 1950°F + Air Cool
Heat Treatment: 1400°F for 10hrs, furnace cool to 1200°F, hold at 1200°F for a total aging time of 20 hrs + Air Cool.

This is the prefered treatment in tensile-limited applications as it produces the best transverse ductility in heavy sections, impact strength and low temperature notch tensile strength. However, this treatment has a tendency to produce notch brittleness in stress rupture.

Material Condition Tensile Strength
ksi
Yield Strength
ksi
Elongation
4D
Reduction of Area
%
Hardness
AMS 5662 Bar 1700-1850°F Anneal - - - -

≤ 277 HB

AMS 5663 Bar 1700-1850°F Anneal + Age 185 150 12 15 ≥331 HB
AMS 5664 Bar 1900-1950°F Anneal - - - - 3" dia 248 HB
3-5" dia 285 HB
  1900-1950°F Anneal + Age 180 150 10 12 ≥341 HB

Typical Mechanical Properties of Alloy 718 Bar above and Alloy 718 Sheet below.

Material Condition Tensile Strength
ksi
Yield Strength
ksi
Elongation
4D
Hardness
Alloy 718 Sheet AMS 5596 < 0.1874" thick 140 80 30 102 HRB
Alloy 718 Sheet AMS 5596 Aged < 0.1874" thick 180 150 12 ≥36 HRC
Alloy 718 Sheet AMS 5597 140 75 30 ≤ 25 HRC
Alloy 718 Sheet AMS 5597 + Aged 180 150 15 ≥38 HRC

Availability
Alloy 718 (UNS N07718) is available in Bar (Rounds, Flat, Shapes), Wire, Billet, Strip, Rod, Sheet, Plate, Forging Stock and Welding Wire. For all stock availability contact Sales.

Specifications
UNS N07718
Werkstoff Nr 2.4668
AMS 5596 Sheet, Strip and Plate
AMS 5597 Sheet, Strip and Plate
AMS 5589 Seamless Tube
AMS 5590 Seamless Tube
AMS 5662 Bars, Forgings and Rings
AMS 5663 Bars, Forgings and Rings
AMS 5664 Bars, Forgings and Rings

AMS 5832 Welding Wire
ASTM B637 Forgings
ASTM B670 Plate, Sheet and Strip
AFNOR NC 19 Fe Nb,
MSRR 7115 and MSRR 7116
Inconel 718 (trademark)
FMC Spec M40110, M40118, M40125, M40902, M40908, M40909, M40910
NACE MR-0175/ISO 15156

Services
At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (aog@aircraftmaterials.com), the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.