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* Inconel/Incoloy and Monel are
Registered Trademarks of Special Metals Corporation and its subsidiaries.
Inconel 718 Technical Data
Description: Inconel 718 is a precipitation hardenable
nickel-based alloy designed to display exceptionally high yield, tensile and
creep-rupture properties at temperatures up to 1300 Degrees F. The sluggish
age-hardening response of Inconel 718 permits annealing and welding without
spontaneous hardening during heating and cooling. Inconel 718 has excellent weldability when compared to the nickel-base
superalloys hardened by aluminum and titanium.
Application: Inconel 718 has been used for jet engine and high-speed airframe parts such as
wheels, buckets, spacers, and high temperature bolts and fasteners.
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
Typical Mechanical Properties:
Alloy 718 - AMS 5662
(properties after heat treatment to AMS 5663)
Strength (0.2% Offset) Ksi
in 4D (%)
Reduction of Area %
The following heat treatment should be used to obtain the best combination of
tensile properties and stress rupture properties:
1 hr 1750 Degrees F to 1800 Degrees F (954 to 982 Degrees C) air cool + 8hr 1325
Degrees F (718 Degrees C) cool 100 Degrees F
/hr to 1150 Degrees F (56 Degrees C/hr to 621 Degrees C), hold 8 hrs and air cool.
To obtain the best room temperature and cryogenic tensile properties, the
following heat treatment should be used:
1 to 2 hr 1950 Degrees F (1066 Degrees C), air cool + 8 hr 1325 Degrees F (718
Degrees C) cool 100 Degrees F/hr to
1150 Degrees F (56 Degrees C/hr to 621 Degrees C), hold 8 hr and air cool.
Hot-working is carried out using a 2050 Degrees F (1121 Degrees C) maximum furnace
temperature. Hot-cold working in the range 1700/1850 Degrees F (927/1010
Degrees C) will
improve the strength of the forging if the service temperature is below about
1100 Degrees F (593 Degrees C). Prolonged soaking at the forging temperature is not desirable.
The material should be given uniform reductions to avoid the formation of
duplex grain structures.
Alloy 718 can be readily machined in either the annealed or the age-hardened
condition. The age-hardened condition gives better chip action on chip breaker
tools and produces a better finish. The annealed condition will give a
slightly longer tool life.
Alloy 718 can be welded in either the annealed or the age condition. Welding
in the aged condition will cause the formation of a softened heat-affected
Price List for Inconel 718
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