Nickel Inconel 718 AMS 5597

AMS 5597 is the aerospace material specification for Inconel 718 (UNS N07718) plate, sheet and strip supplied in the precipitation-hardened (age-hardened) condition. Inconel 718 is a nickel-chromium superalloy prized for high strength, corrosion and oxidation resistance, and excellent tensile and impact strength even at cryogenic temperatures. Its nominal composition is 52.5Ni – 19Cr – 3.0Mo – 5.1Cb – 0.90Ti – 0.50Al – 18Fe.

What sets AMS 5597 apart is its heat-treat route and delivered condition. The material is solution annealed at 1950 °F (1065 °C) and rapidly cooled, usually in water, then precipitation hardened at 1400 °F (760 °C) for 10 hours, furnace cooled to 1200 °F (650 °C), and aged at that temperature for 20 hours. The higher-temperature solution treatment develops the best transverse ductility in heavy sections along with superior impact strength and low-temperature notch toughness, so unlike the formable annealed condition of AMS 5596, AMS 5597 arrives at full strength, ready for service.

Because it is supplied age-hardened, AMS 5597 is the specification of choice for tensile- and strength-limited flat-product applications rather than forming. It’s widely used for jet-engine cases and ducts, turbine compressor and exhaust components, structural panels and brackets, and cryogenic hardware where high strength must be retained down to very low temperatures. Welding efficiency is approximately 100% using the gas tungsten-arc (GTAW) process with proprietary Nickel Filler Metal 718, and the alloy can be age-hardened directly without a prior stress-relief step. Inconel 718 has a density of 0.297 lb/in³ (≈ 8.19 g/cm³) in the aged condition.

Where sheet or strip must be formed before hardening, the solution-annealed condition is covered by AMS 5596; for the equivalent age-hardened condition in seamless tubing, see AMS 5590.

Tech Steel & Materials stocks and supplies AMS 5597 plate, sheet and strip to aerospace and defense tolerances, request a quote for certified material cut to your size and quantity.