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Sensitization of steel

Updated: 12/20/2022
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10y ago

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Sensitization happens when a stainless steel is held at an intermediate temperature (typically ~425 - 815 degrees Celsius) and chromium carbides precipitate at the grain boundaries. This precipitation of chromium carbides at the grain boundaries happens because the carbides are insoluble at these temperatures. In order for the carbide to precipitate, it must get chromium from the surrounding metal. This means that there is a chromium depleted zone around the grain boundaries. It should be apparent that this chromium depleted zone will be less corrosion resistant, specifically to intergranular corrosion.

Sensitization is particularly important in metals that are welded. This is because the welding zone experiences temperatures in the range that can cause sensitization. This can cause localized intergranular corrosion at the weld site.

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10y ago
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Q: Sensitization of steel
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