One of the attractive low activation steels is the austenitic Mn-Cr steel from the view point of waste disposal because of few longlived nuclides. In this paper, three types of Mn-Cr austenitic steels were fabricated by vacuum induction furnace. Then plates with 10 mm thickness were produced by hot-rolling. The physical metallurgy of these steels was studied by the corrected Schaeffler diagram, X-ray and electron diffraction patterns. The corrected Schaeffler diagram and X-ray diffraction (XRD) results showed that the matrix of these steels is a single γ-phase structure. Also, the corrosion behaviour in 0.1M HCl solution was evaluated by opencircuit potential, Tafel polarization, and electrochemical impedance spectroscopy (EIS). The results of Tafel polarization experiments showed that corrosion current density of all three Cr-Mn steels is in the range of 10-4 A cm-2, which indicates their appropriate resistance in this acidic environment. The Nyquist plots showed that polarization resistance decreases from the first to the third Cr-Mn steels. This trend is due to the increase in corrosion current density which corresponds to Tafel polarization curves.
