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Inconel 625 Bars – Composition, Properties and Uses

Inconel 625 Bars

Inconel 625 is a nickel-chromium-molybdenum alloy known for its excellent corrosion resistance and high tensile strength, making it ideal for use in various applications. This metal is commonly used in aerospace, chemical processing, and marine engineering industries, where its unique properties make it an ideal choice. In this blog post, we will closely examine Alloy 625 bars and explore their composition, physical and mechanical properties, uses, and heat treatment.


What is Inconel 625 Bars?

Inconel 625 Round Bar are a type of Nickel-Based Alloy composed of an alloy of Nickel, Chromium and Molybdenum. It provides excellent corrosion resistance in oxidizing and reducing environments and possesses excellent strength, toughness, and fabrication characteristics. The combination makes it the ideal material for various applications such as furnace components, exhaust systems, valves and piping equipment.

Inconel 625 Bars Composition:

Alloy 625 Flat Bar have a composition that is optimized to maximize their corrosion resistance, strength, and durability. These bars comprise about 60% nickel, 20-25% chromium, and 5-10% molybdenum, with small amounts of other elements such as iron, niobium, and cobalt. The bars are also alloyed with carbon, silicon, sulfur, and phosphorus, which help to improve their mechanical properties and resistance to oxidation and chloride stress corrosion.

Grade C Mn Si Cu S Fe Mo Ni Cr
Inconel 625 0.10 max 0.50 max 0.50 max 0.15 min 5.0 max 58.0 min 20.0–23.0

Inconel 625 Bars Physical and Mechanical Properties:

625 Inconel Hot rolled Bar are known for their excellent physical and mechanical properties, making them suitable for harsh environments and demanding applications. The bars have a density of around 8.4 g/cm3 and a melting point of about 1290°C. They have a high tensile strength of 965 MPa and a yield strength of about 415 MPa, which makes them resistant to deformation and cracking under stress. Additionally, these bars have a high modulus of elasticity and low thermal expansion coefficient, which means they can withstand high temperatures without deforming.

Inconel 625 Bar Equivalent

Inconel 625
NCF 625
NA 21

Inconel 625 Bars Uses:

Inconel 625 Round Bar are widely used across a range of industries and applications. They are commonly used in aerospace, where their resistance to corrosion, strength, and high-temperature stability make them ideal for use in aircraft engines, exhaust systems, and other critical components. In the chemical processing industry, these bars are used in chemical reactors, heat exchangers, and other equipment that requires resistance to harsh chemicals and high temperatures. They are also used in marine engineering, where their corrosion resistance and strength make them ideal for marine hardware such as propellers and valves.

Inconel 625 Bars Heat Treatment:

Inconel 625 bars can be heat-treated to improve their properties and increase their resistance to corrosion and stress. Depending on the specific application and requirements, heat treatment can involve annealing, solution treating, and precipitation hardening. Annealing involves heating the bars to around 1010°C and then cooling them slowly, which helps to improve their flexibility and toughness. Solution treating involves heating the bars to between 965-1010°C and then quenching them in water, improving their corrosion and stress resistance. Precipitation hardening involves heating the bars to around 870°C and then cooling them rapidly, which increases their strength and hardness.

Inconel 625 Bars Corrosion Resistance:

Inconel 625 bars are highly corrosion-resistant to various chemicals and environments, including seawater, acids, alkalis, and oxidizing agents. This is due to the high nickel and chromium content in the bars, which forms a protective oxide layer that resists corrosion. The bars also have excellent resistance to chloride stress corrosion cracking, making them ideal for use in seawater environments.


Inconel 625 bars are an excellent choice for applications that require high strength, corrosion resistance, and thermal stability. Their unique properties make them ideal for use in aerospace, chemical processing, and marine engineering industries, where they are used in critical equipment and components. By understanding the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of Inconel 625 bars, manufacturers and engineers can select the best material for their specific application.

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