Precipitation of sulfide inclusions in steel structure and their effect onlocal corrosion processes

Sources and regularities of the formation of nonmetal sulfide inclusions in steel structure are analyzed. The inclusions are shown to precipitate upon reaching a critical product of sulfur and manganese concentrations in the metal matrix. For Fe-Cr, Fe-17%Cr-Ni, Fe-17%Cr-Ti, and Fe-17%Cr-14%Ni-Mo al loys, the regularities of the effect the manganese-sulfide inclusions produ ce on their corrosion-electrochemical characteristics of passivity and pitt ing-resistance are studied. A significant decrease in the local corrosion r esistance of low-alloyed carbon steels due to calcium-sulfide precipitation in the metal is shown.