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Inconel 825 Fasteners – Composition, Properties and Uses

Inconel 825 Fasteners

Inconel 825 is a nickel-iron-chromium alloy with added elements like copper, molybdenum, and titanium. This alloy offers excellent resistance to many corrosive environments, making it suitable for use in harsh acid environments. Inconel 825 fasteners are widely used in various industries, including chemical processing, petrochemicals, nuclear power, and many others. In this blog post, we will explore the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of Inconel 825 fasteners.

Inconel 825 Fasteners Composition

UNS N08825 Bolts comprise a combination of nickel, iron, chromium, copper, titanium, and molybdenum. The composition of these elements provides excellent resistance to various corrosive environments while maintaining high strength and durability. Inconel 825 fasteners are often used in environments with sulfuric acid, phosphoric acid, and other harsh chemicals.

Grade C Mn Si Al S Cr Cu Ni Fe Ti
Incoloy 825 0.05 max 1.00 max 0.05 max 0.02 max 0.03 max 19.50-23.50 1.50-3.00 38.0-46.0 22.0 min 0.06 – 1.20

Inconel 825 Fasteners Physical Properties

Inconel 825 Bolts and Nuts have impressive physical properties, making them ideal for high-temperature and high-pressure environments. This alloy is non-magnetic and has a density of 8.14 g/cm3. The melting point of Nickel Alloy 825 Hex Bolt is around 1370℃, and it has a thermal conductivity of 11.6 W/m-k.

Inconel 825 Fasteners Mechanical Properties

Nickel Alloy 825 Hex Bolt are incredibly strong and durable, making them reliable for applications requiring high strength and toughness. This alloy can withstand high stresses and has excellent tensile strength and elongation at break. Inconel 825 fasteners also exhibit excellent fatigue resistance, making them suitable for use in cyclic loading applications.

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.47 g/cm3 1413 °C (2580 °F) Psi – 95,000 , MPa – 655 Psi – 45,000 , MPa – 310 40 %

Inconel 825 Fasteners Equivalent

Incoloy 825 2.4858 N08825 NCF 825 NA 16 ЭП703 NFE30C20DUM NiCr21Mo XH38BT

Inconel 825 Fasteners Heat Treatment

DIN 2.4858 Stud Bolts require heat treatment to achieve the desired properties. The heat treatment process involves annealing the fasteners at a temperature range of 980-1020℃ for 1 hour, followed by quenching in water or oil. This process helps improve the fasteners’ ductility, toughness, and mechanical properties.

Inconel 825 Fasteners Corrosion Resistance

The most remarkable property of Inconel 825 Bolts and Nuts is their excellent resistance to corrosion in various environments. This alloy can resist corrosion from sulfuric acid, hydrochloric acid, phosphoric acid, and many other corrosive chemicals. Inconel 825 fasteners also exhibit resiliency to stress-corrosion cracking, pitting, and crevice corrosion.


UNS N08825 fasteners are an excellent choice for applications that require high strength, durability, and corrosion resistance. This alloy has a unique combination of elements that provides excellent resistance to various chemical environments, making it ideal for use in harsh conditions. Its physical and mechanical properties make it suitable for high-stress applications, and the heat treatment process can further improve the properties of the fasteners. If you’re looking for fasteners that can withstand harsh environments,  Inconel 825 Nuts are an excellent option to consider.

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