What is sensitization in the Austenitic stainless steel?

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Sensitization in Austenitic stainless steel is the process where chromium carbides form at the grain boundaries, leading to reduced corrosion resistance.

Sensitization occurs when the steel is heated in the temperature range of 450-850°C, causing chromium carbides to precipitate at the grain boundaries.
This depletion of chromium at the grain boundaries makes them susceptible to corrosion, especially in environments containing chlorides.
To prevent sensitization, the steel can be stabilized with elements like niobium or titanium, or the carbon content can be reduced.
Common examples of sensitized stainless steels are AISI 304 and AISI 316.
Sensitization can be detected through various tests like the Huey test or the Strauss test.

What is sensitization in the Austenitic stainless steel?

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