The Qualities of INCONEL® 718 and its use in the manufacture of screws, nuts, tie rods and studs
INCONEL® 718 is a nickel-chromium-based superalloy characterized by high mechanical strength, excellent corrosion resistance and the ability to maintain mechanical properties even at elevated temperatures. These characteristics make it an ideal material for the production of fastening systems such as screws, nuts, tie rods and studs used in aerospace, energy, chemical and automotive applications.
Properties and Advantages for the use of screws, tie rods, nuts and studs in INCONEL® 718
- High mechanical strength – INCONEL® 718 can achieve tensile strength values in excess of 1300 MPa following specific heat treatments.
- Corrosion and oxidation resistance – Excellent resistance to aggressive environments, such as those rich in acids, chlorides and oxidants at high temperatures.
- Excellent resistance to fatigue and creep – Maintains dimensional stability and mechanical properties up to about 700°C.
- Good weldability and workability – Better than other high-strength nickel alloys.
Heat Treatments and Mechanical Resistance Of screws, tie rods, nuts and studs in INCONEL® 718
The mechanical properties of INCONEL® 718 may vary according to the heat treatments applied. Below are some typical values according to ASTM B637, AMS 5662, AMS 5663, AMS 5664, API 6A and API 20F specifications.
| Specifications | Heat Treatment | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| ASTM B637, AMS 5662 | Solubilization at 980°C, aging 720°C for 8h + 620°C for 8h | 1034-1240 | 724-1034 | 12-18 |
| AMS 5663 | Solubilization at 980°C, aging 720°C for 8h + 620°C for 8h | 1275-1380 | 1034-1241 | 10-15 |
| AMS 5664 | Cryogenic treatment with aging | >1380 | >1170 | 8-12 |
| API 6A | Solubilization and aging for petroleum applications | 1200-1400 | >1030 | 10-15 |
| API 20F | Specific controls for critical fastening systems | Complies with API requirements | Complies with API requirements | Complies with API requirements |
Why INCONEL® 718 for Fastening Systems?
Fastening systems made of INCONEL® 718 are used in extreme conditions where standard materials such as stainless steels or titanium alloys do not provide sufficient performance. Some application examples include:
- Aero engines and gas turbines-To withstand high temperatures and high loads.
- Power and nuclear industry-Corrosion and oxidation resistance in critical environments.
- Chemical and petrochemical industry-Reliability in corrosive environments.
- Automotive and Motorsport Scope – Screws and studs for high-performance components.
- Oil & gas industry-Compliant with API 6A and API 20F specifications for critical fastener applications in severe environments.
Conclusion
With its combination of mechanical strength, corrosion resistance and high temperature stability,INCONEL® 718 is the optimal choice for high-performance fastening systems in critical environments. Specific heat treatments allow its properties to be optimized according to application needs, ensuring durability and safety in the most demanding industries.
