The Laramie Energy technology Center (LETC) has mounted a research effort to technically and economically evaluate proposed in situ tar sand extraction methods. As part of that effort, the feasibility of using various metals and ceramic materials in the above ground auxiliary equipment must be determined. The purpose of the present investigation is to produce a data base that will permit prediction of material behavior in a steam stimulation and recovery environment. The materials will be exposed to high pressure (temperature) flow of steam, corrosive product gases, and extrained silica particles. The damage therefore could result from corrosion, erosion, oral combination of the two processes.