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 percent Cr-Ni, Fe-17 percent Cr-Ti, and Fe-17 percent Cr-14 percent Ni-Mo alloys, the regularities of the effect the manganese-sulfide inclusions produce on their corrosion-electrochemical characteristics of passivity and pitting-resistance are studied. A significant decrease in the local corrosion resistance of low-allowed carbon steels due to calcium-sulfide precipitation in the metal is shown.
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