What is the difference between 925 and 825?
What is Incoloy 925 Round Bar and Incoloy 825?
Incoloy 925 is an age-resistant nickel-iron-chromium alloy that contains high levels of molybdenum and copper for improved corrosion resistance. On the other hand, Incoloy 825 is a nickel-iron-chromium alloy that contains significant amounts of molybdenum and copper.
In terms of composition, Incoloy 925 has a higher molybdenum content (18% vs. 2%-3%) and a lower chromium content (23% vs. 19%-24%). This gives it greater strength compared to Incoloy 825. In addition, Incoloy 925 also exhibits better heat resistance, allowing it to withstand temperatures up to 1600°F or 870°C. In contrast, due to its lower chromium content, Incoloy 825 can only withstand temperatures up to 1200°F or 650°C before its mechanical properties degrade.
Finally, since they are often used in marine environments, where corrosion resistance is critical to the long-term successful operation of equipment or structures - especially at high temperatures - both materials provide excellent protection against pitting and crevice corrosion in seawater environments, and have excellent weldability in many processes - including MIG/TIG welding!
Differences between Incoloy 925 Round Bar and Incoloy 825
Chemical Composition
Incoloy 925 and Incoloy 825 are nickel-based alloys with similar chemical compositions, but differ in certain key elements. Incoloy 925 contains more molybdenum and copper, which gives it excellent corrosion resistance in extremely harsh environments. Incoloy 825, by contrast, contains more iron and chromium, which makes it an excellent choice for applications that require high strength and resistance to oxidation and acid attack.
The main components of Incoloy 925 and 825 Round Bar are nickel, chromium, and iron. The difference between the two lies in the chemical composition: Incoloy 925 has a higher nickel content (19%-23%) and a higher molybdenum content (3%-4.5%), while Incoloy 825 has a lower nickel content (20-23%) and a lower molybdenum content (2.5-3.5%). This difference gives both materials distinct advantages in different applications, such as corrosion resistance, high temperature strength, ductility, weldability, etc., making both materials popular choices in industries that require these qualities.
Physical properties
Incoloy 925 is known for its excellent mechanical properties, including high tensile strength, excellent fatigue resistance, and good impact strength. It also has good weldability and can be easily made into different shapes and sizes. On the other hand, Incoloy 825 has a lower coefficient of thermal expansion, making it highly resistant to thermal stress and cracking. In addition, it has good ductility and low magnetic permeability, making it ideal for applications that require good electromagnetic properties.
Corrosion Resistance
Both Incoloy 925 and Incoloy 825 have excellent corrosion resistance in a variety of acidic and alkaline environments, including seawater, sulfuric acid, nitric acid, and hydrochloric acid. However, Incoloy 925 is particularly effective in resisting corrosion caused by sulfuric acid, hydrofluoric acid, and hydrogen sulfide. On the other hand, Incoloy 825 has strong resistance to stress corrosion cracking, pitting, and crevice corrosion in highly oxidizing environments.
Applications
Incoloy 925 round bar is widely used in applications that require high strength, such as oil and gas production, chemical processing, and nuclear power plants. It is also a popular choice for manufacturing components for marine and military environments. Incoloy 825, in contrast, is often used in the production of heat exchangers, piping systems, and other equipment in the chemical and petrochemical industries. It is also suitable for manufacturing parts for the marine and aerospace industries.
