The compatibility of the austenitic AISI 304 steel with Pb-Bi-Sn alloy was analyzed. The AISI 304 steels were immersed in stagnant molten Pb-33.3Bi-33. 3Sn alloy at 400, 500 and 600℃ for different exposure times （100-2 000 h） respectively. XRay diffraction spectrum （XRD） with a Y-4Q system （CuKα,λ= 0. 154 78 nm） was used to identify the phases on the surface of specimens after exposing to Pb-Bi-Sn liquid metal （LM）. The surface and cross section of the specimens were analyzed by means of scanning electron microscopy （SEM） and energy dispersive X-ray analysis （EDX）. The result showed that a FeSn alloy layer on the surface of all specimens was formed, and it prevented AISI 304 steel matrix from penetration attack and loss of alloy elements at 400 and 500 ℃.
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