Inconel 718
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Inconel 718
Inconel 718 is a high-strength, nickel-based superalloy known for its exceptional properties, making it suitable for a wide range of demanding applications. Here are some key characteristics and applications of Inconel 718:
Alloy 718, often referred to as Inconel 718, is a high-strength, corrosion-resistant nickel chromium alloy supplied in the hot worked, solution annealed and age hardened condition. As with other types of Inconel, the Special Materials Corporation owns the trademark for Incoloy Alloy 718.
The addition of Nb, Ti, Al and Ni forms a series of precipitates during the controlled solution annealing and ageing process steps. This results in a significant increase in strength and hardness compared with alternative nickel alloys. These tensile and creep rupture properties are maintained from cryogenic to elevated temperatures. These properties make it suitable for applications between -250oC – 650oC.
As a nickel-chromium alloy, Inconel 718 possesses acceptable corrosion resistance in a range of environments including sea water, hydrogen sulphide, CO2, elemental sulphur and chloride ions over various temperatures. It is resistant to sulphide stress cracking and is capable of passing the sulphide stress corrosion test in accordance with NACE TM 0177 Method C solution A.
Furthermore, Alloy 718 also features exceptional welding properties – even in comparison to other Inconel alloys. As a result of these exceptional welding properties, Inconel Alloy 718 is suitable for a wide range of applications.
Specifications
Key Characteristics:
High Temperature Strength: Inconel 718 maintains its strength and structural integrity at elevated temperatures, making it ideal for applications in high-temperature environments.
Corrosion Resistance: It offers excellent resistance to corrosion, making it suitable for use in corrosive and oxidative environments, including those involving chemicals and seawater.
Good Weldability: Inconel 718 can be readily welded, allowing for the fabrication of complex structures and components.
High Fatigue Resistance: It exhibits excellent fatigue and creep resistance, making it ideal for components subjected to cyclic loading and high-stress conditions.
Outstanding Mechanical Properties: This alloy provides excellent tensile, yield, and impact strength.
Versatility: Inconel 718 can be used in a variety of forms, including bars, sheets, plates, forgings, and more, making it suitable for different applications.
Applications:
Aerospace: Inconel 718 is commonly used in the aerospace industry for components such as jet engine parts, turbine discs, and combustion chambers due to its high-temperature strength and corrosion resistance.
Gas Turbines: It’s used in gas turbines, where it can withstand the high temperatures and stresses associated with power generation and propulsion.
Chemical Processing: Inconel 718 finds applications in chemical processing equipment, especially in environments with corrosive chemicals.
Nuclear Reactors: It is used in nuclear reactors and related applications due to its resistance to radiation and high temperatures.
Oil and Gas Industry: Inconel 718 is used for downhole tools, wellhead equipment, and components exposed to harsh environments in the oil and gas industry.
Medical Implants: Some medical implants, like orthopedic implants, are made from Inconel 718 due to its biocompatibility and high strength.
Aerospace Fasteners: Inconel 718 is used for high-strength fasteners in the aerospace and automotive industries.
Additive Manufacturing: It’s also used in additive manufacturing (3D printing) to create complex, high-strength components for various applications.
Inconel 718 is a versatile and reliable material that meets the stringent requirements of industries where high-temperature strength, corrosion resistance, and reliability are crucial. Its wide range of applications underscores its importance in various sectors.
Products and Size Ranges
We supply hardness of wire (Soft, Quater Hard, Half Hard) according to customer requirements.
Material Certification and Traceability
At Satyam Overseas, we prioritize Material Certification and Traceability. Our materials, meeting ASTM and ASME standards, come with 3.1 Mill Test Certificates as a guarantee of compliance. Additionally, upon request, we provide 3.2 Mill Test Certificates for added assurance. Every material is clearly marked and accompanied by a corresponding certificate, meticulously linking markings to certification. This meticulous approach ensures complete accountability and unwavering reliability throughout our supply chain.
Chemical Composition
| Ni | Cr | Fe | Al | C | Mn | S | Si | Cu | P | B | Mo | Nb | Ti | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Min |
50 |
17 |
– |
0.2 |
– |
– |
– |
– |
– |
– |
– |
2.8 |
4.75 |
0.65 |
|
Max |
55 |
21 |
– |
3.3 |
0.080 |
0.35 |
0.015 |
0.35 |
0.3 |
0.015 |
0.006 |
3.3 |
5.5 |
1.15 |
Physical Composition
| Density | Melting range | Relative magnetic permeability at 20 °C (68 °F) | Curie temperature |
|---|---|---|---|
|
8.26 g/cm3 (0.04 lb/in3 ) at 20 °C (68 °F) |
1,257-1,342 °C (2,295-2,448 °F) |
1.001 (Maximum) |
Solution-annealed: -195 °C (-319 °F) Solution-annealed and age hardened: -112 °C (-170 °F) |
Designations & Standards
| Forms | ASTM | ASME | DIN |
|---|---|---|---|
|
Rod, Bar, Wire and Forging Stock |
B 637 |
SB 637 |
17744 17752 |
|
Sheet, plate |
B 670 |
– |
17744 17750 |
|
Strip |
B 670 |
– |
17742 17750 |
|
Wire |
– |
– |
– |
Differences between Inconel and Hastelloy
Inconel and Hastelloy are both nickel-chromium-molybdenum-based alloys. They are all corrosion-resistant and extremely strong metals. Hastelloy has greater molybdenum content than Inconel, although Inconel has a higher chromium concentration. This sets them apart in terms of corrosion resistance in different situations.