Question

Which of the following metals is most susceptible to stress corrosion cracking (SCC) in chloride environments?

• A. Carbon steel
• B. Copper
• C. Titanium
• D. Austenitic stainless steel

Hint:

In chloride-rich environments, austenitic stainless steels are vulnerable to SCC—especially under tensile stress. Always consider alternatives or protective measures.

Answer 1

The Correct Option is D

Stress corrosion cracking (SCC) is a failure mechanism caused by the combined effect of tensile stress and a corrosive environment.
Austenitic stainless steels, especially grades like 304 and 316, are highly susceptible to SCC in the presence of chloride ions (e.g., from saltwater).
The susceptibility arises due to the breakdown of the passive oxide layer on the steel’s surface in chloride environments, leading to localized corrosion and crack initiation.
Other metals like carbon steel, copper, and titanium show much better resistance to SCC in such conditions.