Inconel 718

General Description

Inconel 718 is a age-hardenable alloy that is highly corrosion resistant. Its high strength, corrosion resistance, and ease of weld fabrication have made alloy 718 the most popular superalloy used in industry.

Inconel 718 has good to excellent resistance to organic acids, alkalies and salts, and seawater. Fair resistance to sulfuric, hydrochloric, hydrofluoric, phosphoric, and nitric acids. Good to excellent resistance to oxidation, carburization, nitridation, and molten salts. Fair resistance to sulfidation.

Age-hardenable Inconel 718 combines high-temperature strength up to 700 °C (1300 °F) with corrosion resistance and excellent fabricability. Its welding characteristics, especially its resistance to postweld cracking, are outstanding. Because of these attributes, Inconel 718 is used for parts for aircraft turbine engines; high-speed airframe parts, such as wheels, buckets, and spacers; high-temperature bolts and fasteners, cryogenic tankage, and components for oil and gas extraction and nuclear engineering.

Chemical Composition

Grade Ni% Cr% Mo% Nb% Fe% Al% Ti% C% Mn% Si% Cu% S% P% Co%
Inconel 718 50.0-55.0 17.0-21.0 2.8-3.3 4.75-5.5 Bal. 0.2-0.8 0.7-0.15 Max 0.08 Max 0.35 Max 0.35 Max 0.3 Max 0.01 Max 0.015 Max 1.0

Designations

UNS N07718

Werkstoff Nr. 2.4668

Specifications

Inconel 718 Wire: AMS 5832

Inconel 718 Bar: ASTM B637/AMS 5662/AMS 5664

Inconel 718 Forging: ASTM B637

Inconel 718 Pipe/Tube: AMS 5589/5590

Inconel 718 Sheet/Strip: ASTM B670

Physical Properties

Density:8.1 g/cm3

Melting Point: 1260°C-1340 °C

Mechanical Properties

Solution Annealed

Tensile: Min 965 MPa

Yiled: Min 550 MPa

Elongation: Min 30%

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