To evaluate the effects of grain boundary carbide precipitation on intergranular stress corrosion
cracking (IGSCC) growth rate of cold-worked to 20% (20%CW) 316 and 304 type stainless steels, crack
growth rates were measured in aerated and deaerated high-temperature pure water environments using
half-inch size compact tension specimens (1/2TCT). In this study, the effects of (1) grain boundary
carbide coverage, (2) Cr-depletion at the grain boundary, and (3) Mo content in alloy on IGSCC growth
were examined in these water environments. The following results were obtained.