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Inconel 825 Flanges – Composition, Properties and Uses

Inconel 825 Flanges

Inconel 825 is a superalloy commonly used in high-temperature applications such as chemical processing, nuclear power, and oil and gas. It has excellent corrosion resistance in acidic and alkaline environments, making it suitable for harsh conditions. Inconel 825 flanges are also widely used in these industries, making it essential to understand their composition, physical and mechanical properties, and uses.


Inconel 825 Flanges Composition

DIN 2.4858 Socket Weld Flanges comprise nickel, iron, chromium, and molybdenum. It also contains titanium, copper, and niobium elements, enhancing the alloy’s corrosion resistance properties. These elements together create a stable nickel-iron-chromium matrix with added resistance against sulfuric, hydrochloric, and phosphoric acids. It also has good weldability, with increased resistance to intergranular corrosion.

Grade C Mn Si S Cu Fe Ni Cr Al Ti
825 0.05 max 1.00 max 0.5 max 0.03 max 1.50 – 3.00 22.00 min 38.00 – 46.00 19.50 – 23.50 0.02 max 0.06 – 1.20

Inconel 825 Flanges Physical Properties

Inconel 825 Long weld neck have a melting point of 1400°C(2552°F), making them suitable for applications that require high-temperature resistance. They also have excellent thermal fatigue resistance, which can withstand cyclic heating and cooling without cracking or deforming. Additionally, they have high density, making them resistant to deformation under high-pressure applications.

g/cm3 °C °F J/kg.k Btu/lb. °F µΩ·m
8.14 1370-1400 2500-2550 440 0.105 1130

Inconel 825 Flanges Mechanical Properties

Incoloy 825 Slip On Flanges have excellent strength and toughness, with a tensile strength of 80 KSI and a yield strength of 32 KSI. Their ductility and toughness make them resistant to fatigue, corrosion, and thermal shock. They also have good machinability, although special tools are necessary to ensure accuracy and surface quality.

ANNEALED 85 (586) 35 (241) 30

Inconel 825 Flanges Equivalent

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

Inconel 825 Flanges Uses

UNS N08825 flanges are commonly used in industrial processes that involve chemical components. They are used in heat exchangers, tanks, and piping systems that handle sulfuric, hydrochloric, phosphoric, and other acidic environments. They are also used in seawater cooling systems, chemical processing, and nuclear fuel reprocessing. Their high-temperature resistance and toughness make them suitable for use in jet engines, gas turbines, and furnace hardware.

Inconel 825 Flanges Heat Treatment

UNS N08825 Weld Neck Flanges undergo heat treatment to improve their mechanical properties. The process involves annealing at temperatures between 1000-1200°C(1832-2192°F) followed by quenching. This treatment improves their toughness, ductility, and workability at high temperatures. However, overheating or prolonged exposure to high temperatures can cause the alloy to undergo precipitation hardening, reducing its ductility and toughness.

Inconel 825 Flanges Corrosion Resistance

Alloy 825 Flanges have excellent resistance to both acidic and alkaline environments. They exhibit excellent resistance to stress corrosion cracking, pitting, crevice corrosion, and intergranular corrosion. This resistance makes them suitable for use in industries that require high-performance alloys that can withstand harsh and corrosive environments.



B564 UNS N08825 is a highly versatile alloy with excellent physical and mechanical properties, making it ideal for high-temperature applications. Its corrosion resistance and toughness make it suitable for use in harsh environments, especially in industries that handle chemical components and acids. Understanding the composition, properties, and uses of Inconel 825 flanges is essential for those who work in these industries to ensure safe and efficient operations.

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