The wetting of 12Cr18Ni10Ti and EK-173 reactor steels by an eutectic melt of PbBi with lithium  under conditions of a vacuum and an argon atmosphere is studied in a wide range of temperatures. A tendency is observed toward the improved wetting of 12Cr18Ni10Ti steel with a higher lithium content in a eutectic melt of PbBi. It is found that an eutectic PbBi alloy with 20.86 at % of Li content tends to improve the wetting process under the conditions of a vacuum and an argon environment.