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Inconel 625 Fasteners – Composition, Properties and Uses

Inconel 625 Fasteners

Inconel 625 is a high-performance nickel alloy resistant to corrosion and oxidation. It is widely used in various industries for its excellent mechanical properties and high-temperature capabilities. Inconel 625 Bolts are essential in industries such as aerospace, chemical processing, oil and gas, and marine industries, to name a few. This blog post will discuss the composition, physical and mechanical properties, heat treatment, corrosion resistance, and applications of Inconel 625 fasteners.

Inconel 625 Fasteners Composition

Inconel 625 Bolts is a nickel-based alloy containing chromium, molybdenum, and niobium elements. The composition of these elements provides the alloy with outstanding strength, corrosion resistance, and high-temperature capabilities. Adding chromium and molybdenum enhances the alloy’s corrosion resistance against acidic environments. Niobium, on the other hand, strengthens the alloy’s mechanical properties.

Grade C Mn Si S Cu Fe Ni Cr
Inconel 625 0.10 max 0.50 max 0.50 max 0.015 max 5.0 max 58.0 min 20.0 – 23.0

Inconel 625 Fasteners Physical Properties

Alloy 625 Nuts have excellent physical properties, such as high melting and boiling points and a low coefficient of thermal expansion. These properties make them ideal for use in high-temperature applications. The melting point of Inconel 625 is approximately 2,150 degrees Celsius, while the boiling point is about 1,317 degrees Celsius. Additionally, the coefficient of thermal expansion is relatively low, making the alloy resistant to thermal fatigue.

Inconel 625 Fasteners Mechanical Properties

Inconel 625 Bolts provide excellent mechanical properties such as high tensile strength, fatigue resistance, and flexibility. The tensile strength of this alloy is typically around 940-1200 MPa, and it has good creep resistance, making it ideal for use at elevated temperatures. Also, it has good fatigue resistance, which means it can withstand cyclic loads without cracking or breaking.

Element Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
Inconel 625 8.4 g/cm3 1350 °C (2460 °F) Psi – 1,35,000 , MPa – 930 Psi – 75,000 , MPa – 705 42.5 %

Inconel 625 Fasteners Equivalent

Inconel 625 2.4856 N06625 NCF 625 NA 21 ХН75МБТЮ NC22DNB4M NiCr22Mo9Nb

Inconel 625 Fasteners Heat Treatment

 Inconel 625 Socket Head Cap Screw  can undergo various heat treatment processes to enhance their mechanical properties and wear resistance. The heat treatment processes include solution annealing, stress relief annealing, and ageing. Solution annealing involves heating the fastener material to high temperatures to dissolve precipitated phases or grains. The stress relief annealing process involves heating the Inconel 625 fasteners to a specific temperature and holding them for a specific time, which helps to relieve any residual stresses in the material. On the other hand, ageing treatment involves heating the fastener material to high temperatures to promote the precipitation of specific intermetallic phases.

Inconel 625 Fasteners Corrosion Resistance:

Alloy 625 Fasteners are known for their superior corrosion resistance, making them ideal for harsh environments. They can withstand a wide range of acidic and alkaline conditions and high-pressure and high-temperature conditions. Adding molybdenum and chromium to the alloy provides exceptional pitting and crevice corrosion resistance. Additionally, Alloy 625 Bolts are resistant to stress corrosion cracking.

Inconel 625 Fasteners Applications:

UNS N06625 Bolts and Nuts are used in various industries, including aerospace, oil and gas, marine, chemical processing, and power generation. Their superior mechanical and physical properties make them ideal for high-pressure and high-temperature applications. In the aerospace industry, they are used in aircraft engines and turbine blades. Inconel 625 fasteners produce chemicals and corrosion-prone environments in the chemical processing industry. The marine industry uses them in offshore oil rigs and seawater equipment.



Inconel 625 Nuts offer numerous benefits, including excellent strength, corrosion resistance, and high-temperature capabilities. Their mechanical and physical properties make them ideal for various industries, including aerospace, oil and gas, marine, and chemical processing. Thanks to their composition and features, Inconel 625 Hex Bolts offer longevity, durability, and cost-effectiveness, making them essential in various applications. Understanding the composition and benefits of Inconel 625 fasteners is crucial to appreciate their suitability for various purposes.

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