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In steel making, high alumina refractory bricks and alumina-magnesia in situ spinel castables are used successfully in the steel ladles, particularly in the wall, the bottom and the impact pad ladles. The high alumina bricks mainly contain coarse bauxite or andalusite grains bonded by a mullitic matrix. The alumina-magnesia castables contain alumina aggregates embedded in an alumina- lime matrix. The matrix is composed of alumina cement, fine grains of magnesia, micro silica, and fine to ultrafine particles of alumina. In the alumina-magnesia castable, magnesia is present in matrix with a fine granulometry. The present paper begins with thermodynamic consideration followed by some results of corrosion tests. Two series of tests were carried out in this study. The first series of tests was performed on pure alumina powder while the second one was performed on dense alumina refractory.