What is the difference between Inconel 800 and 800H?
Difference between Incoloy Alloy 800 and 800H
Incoloy alloys have applications in many fields due to their high temperature strength, oxidation resistance, and corrosion resistance. Among them, Incoloy Alloy 800 and Incoloy 800H are two of the most popular types of this material. While they have several similarities, their differences make them suitable for specific applications. In this blog, we will explore the main differences between Incoloy Alloy 800 and 800H, focusing on their composition, properties, and ideal uses.
What is Incoloy Alloy 800?
Incoloy Alloy 800 is a nickel-iron-chromium alloy designed for high temperature applications. Its composition provides excellent resistance to oxidation, carburization, and other forms of corrosion at high temperatures. Incoloy 800 pipes are often used in industries such as chemical processing, heat exchangers, and power plants that require exposure to high temperatures.
What is Incoloy 800H?
Incoloy 800H is a modified version of Incoloy Alloy 800 with a higher carbon content (about 0.05–0.10%) and a more tightly controlled composition. This modification improves the alloy's creep strength and resistance to stress rupture at elevated temperatures. Incoloy 800H is typically used in applications where the material is subjected to extreme heat and stress for extended periods of time.
Main Differences Between Incoloy Alloy 800 and 800H
Carbon Content
The main difference between Incoloy Alloy 800 and 800H is their carbon content. Incoloy 800 has a lower carbon content, typically around 0.05%, while Incoloy 800H has a higher carbon content of 0.05-0.10%. The higher carbon content in 800H increases strength, making it more suitable for high temperature applications.
Creep Strength
Incoloy 800H is designed to provide higher creep strength at elevated temperatures. The higher carbon content and precise control of other alloying elements give 800H excellent resistance to creep, the gradual deformation of a material under constant stress. As a result, Incoloy 800H is often the first choice for applications where the material is exposed to sustained high temperatures and stress.
Stress Rupture Resistance
Due to its reinforced composition, Incoloy 800H has better stress rupture resistance than Incoloy Alloy 800. This makes 800H a good choice for industries where parts are exposed to high pressure and high temperatures for long periods of time, such as furnace components, petrochemical plants, and heat treatment equipment.
Applications
While both alloys are used in similar industries, Incoloy Alloy 800 is more often used in applications that require resistance to high temperatures and corrosion, but are not designed for extreme or high temperatures. On the other hand, Incoloy 800H is more suitable for high-stress, high-temperature environments where the material needs to maintain structural integrity for long periods of time.
