Stress Corrosion Cracking (SCC) is a dangerous failure mechanism where pipeline steel cracks under the combined action of tensile stress, a corrosive environment, and susceptible material microstructure.

Stress Corrosion Cracking (SCC) is a dangerous failure mechanism where pipeline steel cracks under the combined action of tensile stress, a corrosive environment, and susceptible material microstructure. SCC can propagate rapidly and cause sudden brittle failure without significant prior warning — making it one of the most critical threats to pipeline integrity.

Two main SCC types affect pipelines:
• High-pH SCC (classical SCC) — intergranular cracking in concentrated carbonate-bicarbonate environments near disbonded coatings.
• Near-neutral pH SCC — transgranular cracking in dilute groundwater with dissolved CO₂.

SCC risk factors include operating stress level, coating condition, cathodic protection effectiveness, soil chemistry, and temperature. Prevention and management require targeted inspection, SCC-resistant coatings, and CP optimization.

EMPIT’s CMI technology supports SCC management by detecting coating defects, stress anomalies, and corrosion patterns from the surface — identifying pipeline sections most susceptible to SCC development for prioritized direct assessment.