Duplex stainless steels (DSS), containing both austenite and ferrite phases, are attractive materials owing to a combination of high strength and excellent corrosion resistance and are a natural material choice in applications such as e.g. pressurized equipment in the nuclear, chemical and pulp & paper industries. To increase efficiency in these applications, higher service temperatures and operational temperatures are required. However, the service temperature of DSS grades is limited to ~250°C. Above this temperature, within the ferrite phase, the alloying elements separate into Fe and Cr rich regions, due to phase separation (PS) phenomena, and the material is embrittled. In fully ferritic alloys, PS has been studied for a long time but less work has been performed on studying PS in commercial grade duplex alloys. We propose to study embrittlement in commercially available DSS.