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Hydrogen Re-Embrittlement on anodically coated high strength steels is a relevant risk foraerospace structures due to the possibility of hydrogen uptake during the operative life of the components. AISI4340 and Maraging 250 unnotched tensile specimens were subjected to SSRT in order to evaluate the influenceof test environment on time to failure. Fracture surfaces were examined by SEM analysis to evaluate the degreeof embrittlement and to correlate it with hydrogen diffusivity of the tested steels.