Metal Additive Manufacturing (AM) has emerged as a state-of-the-art technology with the potential to revolutionize the global parts manufacturing landscape and drastically reducing manufacturing lead times. The technology enables the production on-demand pump components particularly suited to the aftermarket sector where parts are of high mix and low volume. This paper presents a comprehensive study to qualify 3D-printable materials for use in the construction of pump impellers. Analyses on chemical compositions and mechanical properties of additively manufactured austenitic and martensitic stainless steels are addressed and benchmarked against equivalent standard cast grades, typically used in pump impeller construction. Further investigations were done to correlate the impact of different heat treatment cycles and their effects on mechanical and corrosion properties. Discussions on intergranular corrosion (IGC), corrosion rates from standardized corrosion tests, as well as material selection guidance of these AM-equivalents are also presented in this paper.