Since geothermal wells are a feasible energy source to replace fossil fuel supply many technologies have been developed to take advantage of geothermal energy. Nevertheless service conditions in geothermal facilities are due to the chemical composition of hydrothermal fluids and temperatures in many cases extreme in terms of corrosion. Therefore materials selection based on preliminary material qualification is essential to guarantee a secure and reliable operation of the facilities.This contribution deals with the evaluation of the corrosion behavior of different steels in flowing artificial geothermal water simulating the conditions in the lower saline Molasse-Basin a location with geothermal potential in Germany.The limitations of suitability of certain steels in this geothermal water obtained by electrochemical measurements and exposure tests are addressed. Results obtained in static and flowing water condition will be compared and discussed in terms of their applicability for plant design. Keywords: localized corrosion steel Ni-alloy flow geothermal energy