Nickel Alloy Inconel 718

Nickel Alloy Inconel 718, also known as UNS N07718, W.Nr. 2.4668, GH4169, is a high-strength, high-temperature resistant alloy composed of nickel, chromium, molybdenum, iron, aluminum and titanium. It is a nickel-based alloy with excellent mechanical properties and corrosion resistance, and is widely applied in high-temperature environments such as aerospace, petrochemical, and nuclear industries.

This nickel-based superalloy shows good resistance to oxidation and other types of corrosion in aerospace engines and land-based gas turbine. It is an ideal material for those requiring excellent performance on aviation creep resistance and corrosion cracking (up to 982°C or 1800°F). Besides, 718 alloy can completely be protected against pitting and bracket corrosion in fluoride, chloride, ridge and other environmental extremes. Even under extreme environment, it still performs excellent in resistance towards oxidation and corrosion with its elongation well maintained. 718 alloy now is applied in many industries, including aerospace, defense and petrochemical.

Under the temperature up to Inconel 1290°F (980°C), alloy 718 performs an exceptional tensile, fatigue, creep, and rupture strengths, which makes it an ideal material to be applied into high-temperature environment, such as gas turbines, instrumentation, and power or process industry components. Moreover, this alloy also performs well in cryogenic areas. Parts made from Inconel 718 can be easily post-hardened by precipitation-hardening heat treatment. Under such conventional and age-hardened conditions, parts can be machined, spark-eroded, welded, micro-shot peened, polished, and coated (if necessary).

Equivalent Grades of Inconel 718:

UNS N07718, Nicrofer 5219, Alvac 718, Haynes 718, Altemp 718, Nickel 718, IN718, AFNOR NC 19 Fe Nb, AWS 013, W.Nr. 2.4668, GH4169 (GB Standard. China)

Alloy Inconel 718 Chemical Composition:

Inconel 718 Material properties

As per ASTM SB637, the tensile strength of UNS N07718 is 1275 Mpa min., the Yield strength is ≥1034, the hardness is HBW 331 min. after solution + precipitation harden.

Properties of Alloy 718

High strength: Inconel 718 alloy performs excellent in strength and hardness, and can still maintain good mechanical properties under high temperatures. Its yield strength can reach 1300 MPa and its tensile strength can reach 1500 MPa.

High temperature resistance: Inconel 718 alloy performs well in its stability and heat resistance under high temperature. Even when temperature reaches 650°C to 700°C, it can still maintain good mechanical properties and can resist high temperature oxidation or thermal corrosion.

Corrosion resistance: Inconel 718 alloy shows good corrosion towards various acids, alkalis and salt solutions. It can still maintain its corrosion resistance at high temperatures, which makes it suitable for corrosive environment uses such as chemical industry and petrochemical industry.

Anti-oxidation: Inconel 718 alloy can effectively resist oxidation reaction and maintain its surface finish and anti-oxidation performance even under high temperature. This brings itself a great value in the application on high temperature oxidation environment.

Favorable processing performance: Inconel 718 alloy can be well forged and machined by various processes such as hot working and cold working. It can be used to manufacture various parts and components of complicated shapes.

Application of Inconel 718

Aerospace: Inconel 718 alloy now is widely applied in the aerospace field to manufacture engine nozzles, turbine blades, combustion chambers and other high-temperature components. Its high strength and high-temperature resistance make it an ideal material for aircraft engines.

Petrochemical: Inconel 718 alloy is also widely used in the petrochemical field. It can be machined into corrosion-resistant parts such as casings and tools in oil well drilling as well as valves while its and good performance under high-temperature and high-pressure environments can be maintained.

Nuclear: Inconel 718 alloy also attached great importance in the nuclear industry. It can be manufactured into structural materials and fuel elements for nuclear reactors with its good performance on radiation resistance and corrosion resistance.

Others: Inconel 718 alloy is also applied in producing automotive engine parts, chemical equipment, ship equipment and high-temperature furnaces. Its high strength and high temperature resistance enable it to be used in various occasions requiring high strength, high temperature stability and corrosion resistance.

In short, Inconel 718 alloy is a kind of material performing high-strength, and well in high-temperature and corrosion-resistance. Now, it is applied and plays an important role in various industries, especially in aerospace, petrochemical, nuclear industry and other high-temperature and high-pressure environments, and becomes a reliable solution for various fields.

Nickel Alloy Inconel 718