Incoloy Alloy 803
Incoloy Alloy 803: High-Performance Alloy for High-Temperature and Corrosive Environments
Incoloy Alloy 803 is a high-strength, nickel-chromium-iron alloy that is designed for applications in high-temperature environments where resistance to oxidation, carburization, and corrosion is crucial. It is an advanced version of the Incoloy 800 series, offering improved high-temperature properties and better resistance to degradation in harsh conditions. Alloy 803 is particularly suitable for use in industries where components must maintain strength and resistance to environmental factors at elevated temperatures.
Key Properties of Incoloy Alloy 803:
Composition:
- Nickel (Ni): 30–35%
- Chromium (Cr): 19–23%
- Iron (Fe): Balance
- Molybdenum (Mo): 1.5–2.5% (typically)
- Small amounts of other elements, including aluminum, titanium, and carbon.
High-Temperature Strength: Incoloy 803 is designed to retain its mechanical strength even at very high temperatures, which is important for applications in heat exchangers, furnace components, and other environments exposed to sustained heat.
Improved Oxidation and Corrosion Resistance: The alloy has superior resistance to oxidation and carburization at high temperatures, especially in gas and steam environments. The addition of molybdenum in Alloy 803 improves its resistance to localized corrosion, pitting, and stress corrosion cracking.
Resistant to Sulfide Stress Corrosion Cracking: Like other alloys in the Incoloy series, Alloy 803 has good resistance to sulfide stress corrosion cracking, making it ideal for use in sulfur-containing environments such as those found in petrochemical refining and natural gas processing.
Fabricability: Alloy 803 can be welded and formed easily, allowing for its use in complex components and shapes, including large structural parts in high-temperature applications. It exhibits good resistance to weld decay, which is critical when components are welded for high-performance applications.
Applications:
- Gas turbines and jet engines: Used in critical components that operate at high temperatures.
- Heat exchangers and furnace parts: Suitable for high-temperature exchangers and furnace applications due to its excellent resistance to oxidation and carburization.
- Petroleum refining: Employed in reactors, cracking units, and reformers where exposure to sulfur and high temperatures occurs.
- Power generation: Suitable for components used in high-temperature environments such as boilers and superheaters.
Temperature Range: Incoloy 803 is designed to perform at temperatures ranging from 1000°F (537°C) to 1800°F (982°C), depending on the application. It can handle both continuous and intermittent service at elevated temperatures without significant loss of strength or corrosion resistance.
Summary:
Incoloy Alloy 803 is a high-performance alloy developed for applications requiring exceptional resistance to high-temperature oxidation, carburization, and corrosion. It improves upon the original Incoloy 800 series by offering enhanced properties for use in extreme environments. With its excellent high-temperature strength, oxidation resistance, and resistance to stress corrosion cracking, Incoloy 803 is widely used in the aerospace, chemical processing, and power generation industries. Its versatility and durability make it a popular choice for components exposed to harsh operating conditions.