Corrosion Behavior of 25Cr-20Ni-ODS Steel in Supercritical Water

Corrosion weight gain test and slow strain rate test (SSRT) were performed to evaluate the corrosion performance of 25Cr-20Ni-ODS steel in supercritical water (SCW). The results show that 25Cr-20Ni-ODS steel had good corrosion resistance in the SCW, and the corrosion rate was extremely low after corrosion for 1 000 h. Intergranular stress corrosion cracking (IGSCC) was observed in the SSRT at 600 ℃ and IGSCC susceptibility increased with the increase of dissolved oxygen (DO) concentration. But the failure mode was ductile fracture at 650 ℃ and no SCC was observed at this temperature.