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As corrosion-resistant alloys with non-equilibrium metallurgical structures, stainless steels containing Mo-rich areas were fabricated by sintering Type 304 L and Mo powders. The effects of the heat-treatment conditions and Mo concentration on the pitting corrosion resistance were assessed, and an appropriate microstructure for achieving higher pitting corrosion resistance and the corrosion-resistant mechanism were determined. Heat treatment at high temperatures resulted in the formation of Mo-rich areas consisting of BCC (Mo- and Cr-enriched) and FCC (Ni-enriched) phases. As the heat-treatment temperature increased, the fraction of Mo-rich areas increased. The increase in the pitting potentials in 0.1 M NaCl with an increasing heat-treatment temperature indicated that the increase in the fraction of Mo-rich areas resulted in higher pitting corrosion resistance. Galvanostatic polarization indicated that the pitting …