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Inconel 718 GH4169 UNS N07718 2.4668 nickel-chromium-iron alloy
Chemical Composition
|
|
Ni | Cr | Fe | Mo | Nb | Co | C | Mn | Si | S | Cu | Al | Ti |
| Min | 50.0 | 17.0 |
|
2.8 | 4.75 |
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|
|
|
|
|
0.2 | 0.7 |
| Max | 55.0 | 21.0 | Bal | 3.3 | 5.5 | 1.0 | 0.08 | 0.35 | 0.35 | 0.01 | 0.3 | 0.8 | 1.15 |
Physical properties
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■Characteristic |
|
|
|
|
|
|
Tensile strength Rm N/mm² |
Yield Strength (0.2％ offset) Rp0.2N/mm² |
Elongation A5 ％ |
Briell Hardness |
Density |
Melting point (℃) |
| 965 | 550 | 30 |
≤363 |
8.2g/cm³ |
1260-1340 |
Executive Standard
| Bar |
Sheet/Strip |
Flange fastener |
| ASTM B637 | ASTM B670 | ASTM B564 |
Features
1, Easy processing
2, High tensile strength, fatigue strength, creep strength and breaking strength at 700 ° C
3, High oxidation resistance at 1000 ° C
4, Stable chemical properties at low temperatures
5, Good welding performance
Metallographic Structure
The 718 alloy has an austenitic structure, and the Y' phase formed by precipitation hardening gives it excellent mechanical properties. The phase formed at the grain boundary during heat treatment gives the best plasticity
Corrosion Resistance
Whether in high temperature or low temperature environment, 718 alloy has excellent resistance to stress corrosion cracking and pitting corrosion. The 718 alloy is particularly excellent in oxidation resistance at high temperatures.
Applications
Due to its high temperature strength, excellent corrosion resistance and easy processing at 700 °C, GH4169 can be widely used in a variety of demanding applications.
1, Steam turbine
2, Liquid fuel rocket
3, Cryogenic engineering
4, Acidic environment
5, Nuclear engineering
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