The effect of composition on SCC of austenitic stainless steel has been investigated in various boiling MgCl2 solutions. The stress applied was a constant load of 25 kg/mm2. The relation between the boiling point of MgCl2 solution (concentration of MgCl2) and the time to fracture was determined. The results obtained are as follows:(1) Commercial stainless steels show the maximum susceptibility to SCC over a certain concentration range of boiling MgCl2 solutions.(2) The sensitized stainless steel suffers intergranular stress corrosion cracking in low-concentration boiling MgCl2 solutions.(3) Based on a study of the effect of component elements, it is found that the boiling point of MgCl2 for the minimum time to fracture is shifted to lower temperatures in presence of C and Si and to higher temperatures in presence of Mo, N, P, Cr and Cu, while Ni decreases the susceptibility to SCC over the whole temperature range investigated.(4) The time to fracture consisted of the induction time and the propagation time. The mechanism of SCC is also discussed here.
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Kowaka et al. (1975) studied this question.
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