[en] SCC behavior near the fusion line of 316L SS welds in high SCC behavior near the fusion line of 316L SS welds in high temperature water has been investigated with special attention on relation to the characteristics of microstructure. Island-type δ-ferrite has been distributed on grain boundary, namely along the potential crack path, in partially method zone of 316L SS weld samples. Most of crack tips have been located on δ-ferrite in partially melted zone of both weld samples. Cr₂O₃ which makes low oxidation rate of δ-ferrite compared with that of austenite phase has been formed by oxidation of δ-ferrite at the crack tip. It has been suggested that the island-type-δ-ferrite in partially melted zone would act as a crack arrester. The retardation mechanism of SCC near fusion line has been proposed assuming that solid oxidation has an essential role in SCC progress. (author)