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The pitting corrosion resistance of surface-modified 316L austenitic stainless steel and N08367 (a ''superaustenitic'' stainless steel) were evaluated in 0.6 M NaCl solutions and compared to untreated samples of the same materials. The surface modification process used to treat the surfaces was a low-temperature carburization technology termed ''low-temperature colossal supersaturation'' (LTCSS). The process typically produces surface carbon concentrations of~15 at. pct without the formation of carbides. The pitting potential of the LTCSS-treated 316L stainless steel in the NaCl solution substantially increased compared to untreated 316L stainless steel, while the pitting behavior of the LTCSS-treated N08367 was unchanged compared to the untreated alloy.