EDELSTAHL SCHNEIDTECHNIK RHEIN-RUHR

Alloy 825

High-alloy Nickel-Iron-Chromium alloy with excellent corrosion resistance and high strength in a variety of aggressive, chemical, and thermal environments

Alloy 825 (also known as Incoloy 825) is a high-alloy nickel-iron-chromium alloy, renowned for its excellent corrosion resistance and high strength in a wide range of aggressive chemical and thermal environments. It combines the advantages of nickel and chromium with additional alloying elements such as copper and titanium, to improve resistance against various forms of corrosion. Alloy 825 is mainly used in the chemical industry, power generation, and other sectors requiring both corrosion resistance and strength.

Chemical Composition (in %):

Element

Content

Nickel (Ni)

38 – 46 %

Chromium (Cr)

19 – 23 %

Molybdenum (Mo)

2,5 – 3,5 %

Iron (Fe)

Balance

Copper (Cu)

1,5 – 3,0 %

Aluminium (Al)

up to 0.2 %

Manganese (Mn)

up to 1 %

Carbon (C)

up to 0.05 %

Silicon (Si)

up to 0.5 %

Sulfur (S)

up to 0.03 %

Titanium (Ti)

0,6 – 1,2 %

Properties :

Corrosion resistance:

  • Excellent resistance to oxidizing and reducing acids such as sulfuric, phosphoric, and nitric acid
  • Resistant to chlorides and chloride-containing solutions such as seawater
  • Good resistance against pitting and crevice corrosion due to its high nickel and chromium content
  • Notably resistant to sulfuric acid, making it preferred in petrochemical industries

Heat resistance:

  • Remains stable at temperatures up to 540 °C (1000 °F), suitable for many high-temperature applications

Strength and toughness:

  • Maintains strength and toughness at both low and high temperatures. Nickel, copper, and molybdenum provide high mechanical strength, making it suitable for structural applications.

Weldability:

  • Good weldability, with strong resistance to cracking and porosity during welding

Resistance to stress corrosion cracking:

  • Provides strong resistance to stress corrosion cracking, especially in high-temperature and corrosive environments

Applications :

  • Chemical industry: Used in reactors, evaporators, and heat exchangers exposed to highly corrosive chemicals such as sulfuric, phosphoric, or nitric acid.
  • Petrochemical industry: Applied in refineries handling aggressive substances, such as reactors, piping, and heat exchangers.
  • Nuclear industry: Used in environments in contact with aggressive substances like seawater or coolants.
  • Flue gas cleaning: Employed in desulfurization plants and other systems due to resistance to sulfuric acid and aggressive gases.
  • Water treatment: Applied in seawater desalination and other water-related processes due to excellent seawater resistance.
  • Aerospace: Utilized in certain aerospace applications requiring corrosion resistance and strength under extreme conditions.

Conclusion:

Alloy 825 (Incoloy 825) is a highly versatile material for industrial applications thanks to its excellent corrosion resistance, particularly against oxidizing and reducing acids as well as chloride-containing solutions. The combination of nickel, chromium, copper, and molybdenum provides outstanding corrosion resistance and mechanical strength, making Alloy 825 a preferred choice in the chemical, petrochemical, and nuclear industries.

Note: The information in this datasheet is provided for description purposes only; no liability is assumed!