Inconel 718 Nickel Alloy
Inconel 718 (UNS N07718) is a nickel-chromium-iron-niobium-molybdenum precipitation hardening alloy. It is strengthened by γ" and γ' phases and possesses both high temperature strength at 650°C and excellent fatigue resistance. Its outstanding welding properties and resistance to stress corrosion make it the preferred material for aircraft engine blades and rocket engine components.
Chemical Composition
|
Ni |
C |
Si |
Mn |
S |
P |
Fe |
Cr |
Cu |
Al |
Ti |
Nb |
B |
Co |
|
|
Min |
50 |
- |
- |
- |
- |
- |
Rem |
17 |
- |
0.2 |
0.65 |
4.75 |
- |
- |
|
Max |
0.08 |
0.35 |
0.35 |
0.015 |
0.015 |
21 |
0.3 |
0.8 |
1.15 |
5.5 |
0.006 |
0.08 |
Material Properties
|
Density |
Melting Point |
Minimum Mechanical Properties of the Alloy at Room Temperature |
||
|
Tensile Strength |
Yield Strength |
Elongation |
||
|
g/cm3 |
℃ |
Rm N/mm2 |
Rp0.2 N/mm2 |
A5% |
|
8.24 |
1260-1340 |
965 |
550 |
30 |
Standards
ASTM B637,ASTM B829,ASTM B670
Feature
Five-fold characteristics:
1. Easy processability
2. High tensile/fatigue/creep/rupture strength at 700°C
3. Oxidation resistance at 1000°C
4. Low-temperature chemical stability
5. Good weldability
Applications
Inconel 718 is a key material for aircraft engines, used for manufacturing turbine discs, compressor discs, and blades.
Petroleum and Chemical Industry.
Automotive industry: Turbochargers, exhaust system components
Shipbuilding industry: Propulsion systems, components resistant to seawater corrosion
Medical devices: Implants, artificial joints (with excellent biocompatibility)
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