Incoloy UNS N08825 Bolt/Nut: A High-Performance Solution for Demanding Applications

Incoloy UNS N08825, often referred to simply as Incoloy 825, is a highly versatile alloy that is renowned for its exceptional resistance to corrosion, high temperatures, and various harsh environments. This material is widely used in industries such as chemical processing, oil and gas, power generation, and marine applications, especially in components like bolts and nuts, which are critical for maintaining structural integrity and performance in demanding environments.

What is Incoloy UNS N08825?

Incoloy UNS N08825 is a nickel-iron-chromium alloy that contains additional elements such as molybdenum, copper, and titanium. These elements give the material its outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion, making it particularly valuable in aggressive and corrosive environments.

Here’s a closer look at the key features of Incoloy UNS N08825:

• Nickel Content: The alloy contains around 38-46% nickel, which is essential for providing resistance to oxidation and corrosion, especially in sulfuric acid and phosphoric acid environments.
• Chromium Content: Chromium, typically present at 19-23%, enhances the alloy's ability to resist oxidation and corrosion.
• Molybdenum and Copper: These elements, combined with nickel and chromium, give Incoloy UNS N08825 exceptional resistance to acidic and alkaline environments, including resistance to stress corrosion cracking in chloride-bearing solutions.
• Titanium: Titanium provides stability to the material and enhances its resistance to high-temperature corrosion.

Key Properties of Incoloy UNS N08825

• Corrosion Resistance: Incoloy UNS N08825 is highly resistant to a wide range of corrosive media, including sulfuric acid, phosphoric acid, and seawater. This makes it an ideal choice for applications in chemical processing, marine environments, and industrial operations where exposure to corrosive substances is inevitable.
• High-Temperature Performance: The alloy maintains its strength and resistance to oxidation even at elevated temperatures, making it suitable for applications in high-temperature environments such as heat exchangers, furnace components, and petrochemical reactors.
• Good Mechanical Properties: Incoloy UNS N08825 exhibits excellent strength and toughness at both ambient and high temperatures, along with good weldability and formability.
• Stress Corrosion Cracking Resistance: It has an exceptional resistance to stress corrosion cracking, a common issue in many alloys exposed to chloride environments.

Applications of Incoloy UNS N08825 Bolt/Nut

Due to its exceptional properties, Incoloy UNS N08825 is used in a variety of applications where high-performance fasteners, such as bolts and nuts, are required. Some key applications include:

1. Chemical Processing Plants: The ability to withstand aggressive chemicals and high temperatures makes Incoloy UNS N08825 bolts and nuts ideal for use in chemical reactors, heat exchangers, and piping systems.
2. Oil and Gas Industry: This alloy is commonly used in subsea and offshore applications where corrosion resistance and strength are essential to withstand harsh marine environments and pressure conditions.
3. Power Generation: Incoloy 825 is used in boilers, reactors, and other critical components in power plants, where it helps maintain operational integrity in high-temperature, corrosive environments.
4. Marine Applications: Due to its resistance to seawater corrosion, Incoloy UNS N08825 bolts and nuts are used in marine hardware, desalination equipment, and offshore structures.
5. Waste Treatment Systems: The alloy’s resistance to acids and corrosive chemicals makes it well-suited for waste treatment facilities, including those dealing with acidic or toxic

waste.

Incoloy UNS N08825 Bolt/Nut Specifications

SpecificationsASTM B 425 ASME SB 425

StandardDIN, ASTM, BS and all International Standards

Length3 mm to 200 mm

SizeM3 – M56 | 3/6″ to 2″ | Custom Sizes