API 571 Certification (Corrosion & Materials) 2025 – 400 Free Practice Questions to Pass the Exam

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Which of the following materials is NOT susceptible to HTHA?

5Cr-0.5Mo

300 series SS

The 300 series stainless steels are generally known for their excellent resistance to hydrogen-induced damage, including hydrogen attack, hydrogen embrittlement, and high-temperature hydrogen attack (HTHA). These materials typically contain significant nickel content, improving their properties in corrosive environments. The austenitic structure of 300 series stainless steels also contributes to their resistance to HTHA, making them a favorable choice in applications where hydrogen exposure occurs.

In contrast, the other materials listed, such as the various chromium-molybdenum steels (5Cr-0.5Mo, 1Cr-0.5Mo, and Mn-0.5Mo), can be more susceptible to HTHA due to their composition and microstructure. These materials are often used in high-temperature applications, but their susceptibility to HTHA underscores the need for careful evaluation in environments where they may be exposed to hydrogen at elevated temperatures.

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1Cr-0.5Mo

Mn-0.5Mo

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