Duplex stainless steels are characterized by a biphasic structure containing austenite islands precipitated in the ferrite matrix.These steels have good mechanical properties and good corrosion resistance.However, these materials are susceptible to hydrogen embrittlement.In this work has been studied the hydrogen diffusion and embrittlement of super duplex stainless steel SAF 2507 in the material as received and annealed.To evaluate the influence of microstructure on the diffusion have been performed hydrogen electrochemical permeation tests.It was observed that the apparent diffusion coefficient increases with annealing temperature.The influence of hydrogen on toughness of the annealed material was studied using CTOD testing.It was determined that the fracture toughness of the material decreases considerably when it is subjected to hydrogen charge.The presence of hydrogen also changed the material fracture mechanism, a completely ductile fracture of the material has been observed in the material tested in the absence of hydrogen and a brittle fracture, characterized by cleavage, was observed in the hydrogenated material.It has been determined that the austenitic phase could be embrittle by hydrogen under certain conditions.