__________ is a form of stress corrosion cracking normally occurring during shutdowns, startups or during operation when air and moisture are present. Cracking is due to sulfur acids forming from sulfide scale, air and moisture acting on sensitized stainless steel.

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Polythionic acid SCC, also known as PTSCC, is a form of stress corrosion cracking that occurs in the presence of air, moisture, and sulfur acids formed from sulfide scales. This type of cracking is commonly seen during shutdowns or startups, as well as during operation of a system. Sensitized stainless steel is particularly susceptible to this type of cracking, which can lead to catastrophic failures if not addressed.

__________ Is a Form of Stress Corrosion Cracking Normally Occurring