UNS N07718
Inconel 718 is a precipitation-hardened nickel-chromium-iron superalloy renowned for its high-temperature strength, corrosion resistance, and excellent processability. Operating effectively from -253°C to 700°C (short-term up to 800°C), it is widely used in aerospace, energy, and chemical industries.
Inconel 718 Nickel-Based Superalloy: Global Standards, Performance Comparison & Key Properties
Overview
Inconel 718 is a precipitation-hardened nickel-chromium-iron superalloy renowned for its high-temperature strength, corrosion resistance, and excellent processability. Operating effectively from -253°C to 700°C (short-term up to 800°C), it is widely used in aerospace, energy, and chemical industries.
Key Properties
High-Temperature Performance
Ultimate Tensile Strength: 965 MPa (room temperature), maintaining ~690 MPa at 650°C.
Oxidation Resistance: Superior stability under 1000°C, with exceptional creep and fatigue resistance.
01
Corrosion Resistance
Resists acids, alkalis, salt solutions, and stress corrosion cracking.
02
Machining & Welding
Compatible with TIG, MIG, and plasma welding without post-weld cracking.
Requires solution treatment (980-1080°C) and aging (720-760°C) for optimal properties.
03
Cryogenic Performance
Retains toughness at -253°C, ideal for liquid hydrogen/oxygen storage systems.
04
Physical Properties
Density: 8.19-8.24 g/cm³; Melting Point: 1260-1383°C; Low magnetic permeability.
05
Performance vs. Competing Alloys
|
Alloy |
Advantages |
Limitations |
|
Inconel 625 |
Better corrosion resistance |
Lower high-temperature strength |
|
Haynes 282 |
Higher thermal stability (up to 870°C) |
Complex processing, high cost |
|
Waspaloy |
Superior creep resistance (>800°C) |
Poor weldability |
Note: Inconel 718 excels in balanced performance for applications requiring both strength and manufacturability.
Applications
Aerospace
Turbine blades, combustion chambers, rocket fuel ducts.
01
Energy
Nuclear reactor components, gas turbine parts.
02
Chemical Processing
High-temperature reactors, corrosion-resistant piping.
03
Medical Devices
Implants and surgical tools (excellent biocompatibility).
04
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Global Material Standards
|
Country/Standard |
Designation |
|
China |
GH4169 |
|
USA |
UNS N07718 |
|
Europe |
W.Nr. 2.4668 |
|
France |
NC19FeNb |
|
Germany |
NiCr19Fe19Nb5 |
|
UK |
NA51 |
|
ISO |
NiCr19Nb5Mo3 |
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