Transgranular stress corrosion cracking of X-80 and X-52 pipeline steels in dilute aqueous solution with near-neutral pH

Slow strain rate tests (SSRT) and fractographic examination of X-80 and X-5 2 pipeline steels showed transgranular stress corrosion cracking (TGSCC) co uld occur in a dilute aqueous solution with near-neutral pH. SCC intensity increased as the applied electrochemical potential and strain rates decreas ed. Hydrogen precharging or addition of carbon dioxide (CO2) facilitated th e process of SCC, suggesting that dissolution and hydrogen ingress were inv olved in the cracking process.