SCC growth and intergranular corrosion behavior of Type 316L stainless steel in high temperature water
- Toshiba Corp., Yokohama (Japan)
Experiments have been carried out on ASTM 1T-CT and 1T-WOL crack growth specimens of mill annealed Type 316L stainless steel to examine the IGSCC susceptibility of non sensitized stainless steel in high temperature water. This material containing 0.020 wt%C has no evidence of chromium depletion or sensitization after 10% oxalic acid etch test and EPR measurement. At the condition of 0.02 ppm O{sub 2} and conductivity of 0.5 us/cm, intergranular crack growth was detected on the Type 316L stainless steel specimen. The crack growth rate of this material was about a factor of 10 lower than that of sensitized Type 304 stainless steel. Crack growth was not detected, however, on the specimen tested in 0.1 uS/cm conductivity water. This result indicated that water conductivity predominantly affected the intergranular crack growth of Type 316L stainless steel. Intergranular attach was also found out in creviced regions of Type 316L specimens in 0.5 uS/cm conductivity water, and clear intergranular morphology was observed by scanning electron microscopy after Streicher test. On the other hand, intergranular attack in creviced region and intergranular morphology after Streicher test were not found on mill annealed Type 304L stainless steel. Molybdenum included in Type 316L stainless steel seems to play a role in accelerating intergranular corrosion under relatively high conductivity water condition.
- OSTI ID:
- 48057
- Report Number(s):
- CONF-910808--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Intergranular stress-corrosion cracking of austenitic stainless steels in PWR boric-acid storage systems
Environmentally assisted growth rate response of non-sensitized 316 grade stainless steels in high temperature water