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The effects of dissolved oxygen concentration and temperature on the susceptibility to SCC of low alloy steels in pure water have been studied by means of slow strain rate tensile test (SSRT). The results obtained are summarized as follows: 1) The effect of dissolved oxygen on the susceptibility to SCC appears more clearly at the high temperature range from 200 to 288C, and the susceptibility to SCC decreases with decreasing dissolved oxygen concentration. On the other hand, the susceptibility to SCC in water containing dissolved oxygen concentration from 0.2 to 8ppm becomes almost the same at the low temperature range belows 150C. 2) The susceptibility to SCC increases with rising temperature in the case of high dissolved oxygen of 8 ppm, but passes through a maximum at the temperatures below 288C in the case of low dissolved oxygen of 0.2 and 2 ppm. 3) Pitting corrosion occurs in water containing 0.2, 2 and 8ppm of dissolved oxygen at temperatures ranging from 50 to 288C. SCC nucleates at corrosion pits, and correlation is found between the susceptibility to SCC and the number of corrosion pits.

The Effects of Dissolved Oxygen Concentration and Temperature on the Stress Corrosion Cracking of Low Alloy Steels in High Temperature Water