Nickel Inconel 718 AMS 5664

AMS 5664 is the aerospace material specification for Inconel 718 (UNS N07718) bar, forging and ring supplied in the solution and precipitation (age) heat-treated condition using a higher-temperature solution treatment. Inconel 718 is an age-hardenable nickel-chromium superalloy prized for high strength and excellent corrosion and oxidation resistance across a broad temperature range, from cryogenic service up to about 1300°F (704°C).

The defining feature of AMS 5664 is its higher solution temperature (nominally around 1900°F / 1038°C) prior to aging. Putting more of the strengthening elements into solution before precipitation hardening yields improved stress-rupture ductility, better notch toughness, and more uniform properties through heavier cross-sections, at the trade-off of slightly lower room-temperature tensile strength than the standard 1750°F solution condition.

AMS 5664 is therefore specified for larger-diameter bar, heavy forgings and rings, and higher-temperature rotating or structural parts where rupture ductility and section performance matter as much as peak strength.

Inconel 718 welds readily, resists post-weld strain-age cracking, and has an aged density of 0.297 lb/in³ (≈ 8.19 g/cm³). Its combination of toughness and elevated-temperature stability makes AMS 5664 a strong choice for demanding turbine and structural hardware.

For the standard high-strength bar condition, see AMS 5662; where guaranteed stress-rupture life is the priority, see AMS 5663.

Tech Steel & Materials stocks and supplies AMS 5664 bar, forging and ring to aerospace and defense tolerances, request a quote for certified material cut to your size and quantity.