Dear Aamir,
Low alloys are often selected for high-temperature service due to their unique combination of properties that provide resistance to various damage mechanisms such as 475°C embrittlement, high-temperature hydrogen attack (HTHA), and graphitization. Here's a detailed explanation of why they are used and how they resist these specific damage mechanisms:
Mechanical Strength at Elevated Temperatures:
Resistance to Oxidation and Corrosion:
Control of Embrittlement Mechanisms:
Heat Treatment Flexibility:
Compatibility with High-Temperature Fabrication Processes:
475°C Embrittlement:
High-Temperature Hydrogen Attack (HTHA):
Graphitization:
The selection of low alloy steels for high-temperature service is driven by their superior mechanical properties, oxidation and corrosion resistance, and the ability to resist specific high-temperature damage mechanisms. These steels are engineered through careful alloying and heat treatment to perform reliably in demanding high-temperature environments, making them an excellent choice for such applications beyond just cost considerations.
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