Inconel 800 and Incoloy 800H are both nickel-iron-chromium alloys, but they have some differences in composition and properties.
Incoloy 800 is a nickel-iron-chromium alloy that is designed for high-temperature applications. It belongs to the Incoloy series of superalloys and has excellent corrosion resistance in various environments.
Composition:
Nickel: 30-35%
Chromium: 19-23%
Iron: 39.5% minimum
Small amounts of aluminum, titanium, and carbon
Properties:
High temperature resistance: Incoloy 800 can withstand high temperatures up to 1100°C (2000°F), making it suitable for applications in heat processing industries.
Corrosion resistance: It offers excellent resistance to oxidation, carburization, and nitridation in environments with high temperature and sulfur-containing atmospheres.
Strength and ductility: It has good mechanical properties, including high tensile strength and toughness.
Thermal stability: Incoloy 800 retains its properties even under cyclic heating and cooling conditions.
Weldability: It can be easily welded using conventional welding methods.
Applications: Incoloy 800 is commonly used in various industries, including:
Chemical processing: It is used in manufacturing equipment such as heat exchangers, reaction vessels, and piping systems that handle corrosive chemicals.
Power generation: Incoloy 800 is used in power plants for high-temperature applications, such as boiler components and heat recovery steam generators.
Petrochemical processing: It is suitable for equipment exposed to high temperatures and corrosive environments in petrochemical refineries.
Industrial furnaces: Incoloy 800 is used as heating elements, radiant tubes, and other components in high-temperature furnaces.
Aerospace and automotive industries: It is used in applications such as gas turbine combustion cans and afterburner parts.
Overall, Incoloy 800 is a versatile alloy with excellent high-temperature and corrosion-resistant properties, making it suitable for various demanding industrial applications.
Incoloy 800H is a modified version of Incoloy 800, which has been specially developed to provide even greater creep resistance and improved high-temperature strength. The "H" in Incoloy 800H stands for "high temperature."
Composition: The composition of Incoloy 800H is similar to Incoloy 800, with some modifications to enhance its high-temperature capabilities. The major alloying elements are:
Nickel: 30-35%
Chromium: 19-23%
Iron: 39.5% minimum
Small amounts of aluminum, titanium, and carbon
Aluminum and titanium contents are deliberately restricted in Incoloy 800H to promote the formation of a stable phase called carbide during prolonged exposure to elevated temperatures. This carbide phase helps improve creep resistance.
Properties:
Enhanced high-temperature strength: Incoloy 800H has higher mechanical strength than Incoloy 800 at elevated temperatures. It retains its strength and structural integrity even after prolonged exposure to high temperatures.
Improved creep resistance: Creep is the tendency of a material to slowly deform under constant stress at high temperatures. Incoloy 800H exhibits improved resistance to creep than Incoloy 800, making it suitable for applications that require prolonged exposure to elevated temperatures.
Excellent corrosion resistance: Similarly to Incoloy 800, Incoloy 800H offers excellent resistance to oxidation, carburization, and nitridation in various corrosive environments.
Good weldability: Incoloy 800H can be easily welded using conventional welding techniques.
Applications: Incoloy 800H is primarily used in applications where resistance to high-temperature environments and corrosion is essential, such as:
Chemical and petrochemical processing: It is suitable for manufacturing equipment handling aggressive chemicals, sulfur-containing atmospheres, and high-temperature corrosive environments.
Heat exchangers: Incoloy 800H is commonly used for tubes and components in heat exchangers due to its high-temperature strength and corrosion resistance.
Power generation: It finds applications in power plants for components that come into contact with hot gases, steam, and high-temperature combustion environments.
Industrial furnaces: Incoloy 800H is used in radiant tubes, muffles, and other furnace components exposed to high temperatures.
Gas turbines: It has been used in parts of gas turbines that require excellent creep resistance and high-temperature strength.
Overall, Incoloy 800H is an advanced alloy that offers enhanced high-temperature strength and improved creep resistance compared to Incoloy 800, making it suitable for demanding industrial applications operating at elevated temperatures.
Incoloy 800 and Incoloy 800H are two variations of the same nickel-iron-chromium alloy, with slight differences in their chemical composition and properties. Here are the key differences between Incoloy 800 and Incoloy 800H:
Chemical Composition:
Incoloy 800: It has a composition of approximately 32% nickel, 20% chromium, 46% iron, with small amounts of other elements such as copper, titanium, and aluminum.
Incoloy 800H: It is a modified version of Incoloy 800, with a slightly different composition. It contains about 32% nickel, 21% chromium, 46% iron, along with increased carbon (0.05-0.10%) and aluminum (0.30-1.20%) contents.
Properties:
High-Temperature Strength: Both Incoloy 800 and Incoloy 800H offer excellent strength and mechanical properties at elevated temperatures. However, Incoloy 800H has higher high-temperature strength and improved creep resistance than Incoloy 800. This is due to the increased carbon and aluminum content in Incoloy 800H, which promotes the formation of a stable carbide phase, enhancing its resistance to creep deformation.
Corrosion Resistance: Incoloy 800 and Incoloy 800H exhibit similar levels of corrosion resistance, providing excellent resistance to oxidation, carburization, and nitridation in various corrosive environments.
Weldability: Both alloys are easily weldable using conventional welding techniques.
Applications: Both Incoloy 800 and Incoloy 800H have a wide range of industrial applications where high-temperature strength and corrosion resistance are required. Some common applications include:
Heat exchangers and process piping in chemical and petrochemical industries.
Furnace components like radiant tubes, muffles, and trays.
Power generation plants, including components in steam boilers and gas turbines.
Industrial furnaces and incinerators.
Catalyst support grids and fixtures in the production of oil and gas.
While Incoloy 800 is suitable for many high-temperature applications, Incoloy 800H is specifically designed for environments that require higher creep resistance and superior high-temperature strength. The choice between them depends on the specific application and the desired properties.
Post time: Aug-11-2023