Introduction

Alloy 825 is a nickel-iron-chromium alloy that excels in highly corrosive environments, particularly in acidic conditions. This article explores the properties of Alloy 825 bar, highlighting its outstanding resistance to both general and localized corrosion, and discusses why Ever Nickel is the ideal supplier for this alloy, especially for applications in the chemical processing and petrochemical industries.

Chemical Composition and Microstructure

Alloy 825 consists of approximately 38-46% nickel, 19-23% chromium, 2.5-3.5% molybdenum, and small amounts of titanium, iron, and copper. The addition of molybdenum and copper significantly enhances the alloy's resistance to pitting and crevice corrosion, which are common in acidic environments. The titanium stabilizes the alloy, preventing carbide formation that could lead to sensitization and intergranular corrosion.

The microstructure of Alloy 825 is primarily austenitic, and it is solid-solution strengthened, providing good strength and toughness even in aggressive corrosive conditions.

Corrosion Resistance in Acidic and Chloride-Rich Environments

Alloy 825 is particularly resistant to sulfuric acid, phosphoric acid, and hydrochloric acid, making it ideal for applications in chemical processing, waste treatment, and acid handling. Its resistance to both pitting and crevice corrosion is superior to that of other alloys, making it an excellent choice for handling concentrated acids.

Additionally, the alloy performs well in chloride-rich environments, where many other materials would suffer from chloride stress corrosion cracking (SCC). This resistance to SCC is critical for ensuring the long-term integrity of equipment exposed to seawater, brine solutions, and other chloride-containing fluids.

Mechanical Properties

Alloy 825 has a tensile strength in the range of 80,000 to 100,000 psi (552-689 MPa) and offers good elongation and toughness. This makes it suitable for both structural and pressure vessel applications. The alloy also maintains its strength and ductility at temperatures up to approximately 800°F (427°C), allowing it to perform effectively in both high- and low-temperature environments.

Applications in Chemical Processing

The primary applications for Alloy 825 include:

• Heat exchangers: Alloy 825 is commonly used in heat exchangers exposed to acidic and corrosive fluids, where its corrosion resistance ensures long service life.

• Storage tanks and reactors: It is used in tanks and reactors that handle aggressive chemicals, including sulfuric and phosphoric acids.

• Piping and fittings: Alloy 825 is ideal for piping systems that transport corrosive fluids, ensuring the durability of systems in both industrial and offshore environments.

Why Choose Ever Nickel ?

Ever Nickel offers Alloy 825 bar products that meet the demanding specifications for chemical processing applications. With its extensive experience in the supply of high-performance alloys,  Ever Nickel ensures that each piece of Alloy 825 meets stringent industry standards for corrosion resistance, strength, and reliability.

Conclusion

Alloy 825 bar is a crucial material for applications in chemical processing, particularly in environments exposed to acidic and chloride-rich fluids. Ever Nickel provides the highest-quality Alloy 825 products, ensuring superior corrosion resistance and performance in critical industrial applications. By partnering with Ever Nickel, you gain access to the materials you need for reliable and efficient operations.