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Inconel 718 Flanges – Composition, Properties and Uses

Inconel 718 Flanges

In today’s industrial sectors, flanges are an essential component of piping systems. They help connect pipes, valves, pumps, and other equipment, making regulating the flow of fluids and gases easier. When it comes to high-temperature and harsh environments, one of the most reliable flange materials is Inconel 718. But what makes it so special, and what properties does it offer? In this blog post, we’ll answer these questions and more, so keep reading to learn all you need to know about Inconel 718 Flanges.


Inconel 718 Flanges Composition:

Inconel 718 is a nickel-based alloy containing chromium, iron, molybdenum, niobium, and small amounts of titanium and aluminium. Combining these elements gives it exceptional strength and corrosion resistance even at high temperatures up to 1300°F. Moreover, the presence of niobium enhances its weldability and resistance to fatigue, making it a popular choice for critical applications such as aerospace, chemical processing, and oil refining.

Grade C Mn Si S Cu Fe Ni Cr
Inconel 718 0.08 max 0.35 max 0.35 max 0.015max 0.30 max 50.00 – 55.00 17.00 – 21.0

Inconel 718 Flanges Physical Properties:

Inconel 718 Socket Weld Fittings has a density of 8.19 g/cm³ and a melting point of 1260-1335°C. In its annealed condition, it has a tensile strength of 120-150 ksi, yield strength of 60-130 ksi, and an elongation of 12-30%. However, its physical properties can be enhanced after heat treatment to achieve even higher strength and hardness. Its high-temperature strength and creep resistance are also unmatched compared to other stainless steel alloys.

Inconel 718 Flanges Mechanical Properties:

Besides its excellent physical properties, Alloy 718 Socket Weld Fittings also exhibits impressive mechanical properties. Its hardness ranges from HRB 95-40 in its annealed state to HRC 50-55 after heat treatment. It has a modulus of elasticity of 29.7 x 10³ ksi, a Poisson’s ratio of 0.3, and a shear modulus of 11.2 x 10³ ksi. With these mechanical properties, Inconel 718 can withstand extreme mechanical stress and vibrations commonly experienced in harsh operating environments.

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.1 g/cm3 1350 °C (2460 °F) Psi – 135,000 , MPa – 930 Psi – 70,000 , MPa – 482 45 %

Inconel 718 Flanges Equivalent

Inconel 718 2.4668 N07718

Inconel 718 Flanges Uses:

Inconel 718 Forged Socket Weld Fitting in various applications require high strength, corrosion resistance, and thermal stability. Aerospace is used in jet engines, rocket motors, and space engines. It is used in reactors, heat exchangers, and pipelines carrying corrosive fluids in chemical processing. In oil refining, it is used in valves, couplings, and manifolds to handle high pressure and temperature. It is also used in medical devices, power generation, and nuclear industries, making it a versatile alloy used across various industries.

Inconel 718 Flanges Heat Treatment:

Heat treatment is essential in enhancing the physical and mechanical properties of Alloy 718 Flanges. This alloy can be heat-treated in different ways, such as annealing, solution treating, ageing, and precipitation hardening. Each heat treatment has a specific effect on its microstructure and properties. Annealing, for instance, improves its ductility and machinability, while precipitation hardening increases its strength and toughness. It is vital to consult with heat treatment specialists to determine the best heat treatment process for your Inconel 718 flanges.

Inconel 718 Flanges Corrosion Resistance:

Inconel 718 Forged Flanges is known for its exceptional corrosion resistance, making it suitable for harsh environments that involve corrosive fluids and gases. It has superior resistance to pitting, crevice corrosion, and stress-corrosion cracking (SCC). More surprising is that its strength and toughness remain intact even after extended exposure to high temperatures and corrosive environments. Thus, Inconel 718 flanges can endure repeated use and provide long-lasting protection against corrosion.



Inconel 718 flanges are a top choice for industries that require high-strength and corrosion-resistant piping components. Its unique composition, physical and mechanical properties make it versatile enough to handle even the harshest operating conditions. Whether you’re in aerospace, oil refining, or chemical processing, Inconel 718 flanges offer unmatched performance. Therefore, it is essential to understand its composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance to make informed decisions when selecting piping components.

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