Nickel Alloy 825

Products Description

Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additional elements including molybdenum, copper, and titanium. Here are some key points about Alloy 825:Corrosion Resistance:Alloy 825 is designed to provide exceptional corrosion resistance in both oxidizing and reducing environments.It is resistant to chloride stress-corrosion cracking, which is a type of corrosion that occurs in the presence of chlorides and tensile stress.The alloy also exhibits resistance to pitting corrosion, which is localized corrosion that can cause small holes or pits in the material's surface.Stabilization Against Sensitization:The addition of titanium to Alloy 825 stabilizes it against sensitization in the as-welded condition.Sensitization refers to the formation of chromium carbides along the grain boundaries of stainless steels, which can lead to intergranular attack and reduced corrosion resistance.Alloy 825 titanium content helps prevent intergranular attack after exposure to temperatures that would sensitize unstabilized stainless steels.Fabrication:The fabrication of Alloy 825 is typical of nickel-base alloys.The material is readily formable, allowing it to be shaped into various components.It is weldable using a variety of techniques, enabling the construction of complex structures or joining with other materials.Alloy 825 finds applications in various industries, including chemical processing, oil and gas, marine, and nuclear, where its corrosion resistance and mechanical properties are required.It's important to note that while Alloy 825 offers excellent corrosion resistance, it may not be suitable for certain highly oxidizing environments. Consulting with materials engineers or alloy manufacturers is recommended to determine the best choice for a specific application.

General Properties

Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. Here are some key points about Alloy 825's corrosion resistance and fabrication:

Corrosion Resistance:Alloy 825 is designed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.The nickel content in Alloy 825 makes it resistant to chloride stress-corrosion cracking, a type of corrosion that occurs in the presence of chlorides and tensile stress.The combination of nickel, molybdenum, and copper in Alloy 825 offers substantially improved corrosion resistance in reducing environments compared to conventional austenitic stainless steels.The chromium and molybdenum content of Alloy 825 provides resistance to chloride pitting and resistance to a variety of oxidizing atmospheres.The addition of titanium stabilizes the alloy against sensitization in the as-welded condition, making it resistant to intergranular attack after exposure to temperatures that would typically sensitize unstabilized stainless steels.Alloy 825 exhibits resistance to corrosion in a wide variety of process environments, including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric, and organic acids, as well as alkalis such as sodium or potassium hydroxide and acidic chloride solutions.Fabrication:The fabrication of Alloy 825 is typical of nickel-base alloys.The material is readily formable, allowing it to be shaped into various components.It is weldable using a variety of techniques, enabling the construction of complex structures or joining with other materials.Alloy 825 is commonly used in industries such as chemical processing, oil and gas, marine, and power generation, where its exceptional corrosion resistance and mechanical properties are required.As always, it's important to consider specific operating conditions and consult with materials engineers or alloy manufacturers to ensure the appropriate selection and use of Alloy 825 in a particular application.