In this paper is evaluation of susceptibility to hydrogen degradation ofAl SI steel 1045. Susceptibility of AISI 1045 steel to hydrogen embrittlement has been made by mechanical tensile test a static fatigue in hydrogen generation environments. Test were carred out using round notched specimens subjected to axial tensile load in O, IN EI2SO4 solution with to 0,25 g/1 arsenite sodium using hydrogen cathodic charging technique at densities current various. Reduction in area, tensile strength and fracture delayed of time were chosen relative changes as measures of susceptibility to hydrogen embrittlement. Fracture modes of failed samples were examined with of microscope. Mechanical test in inert environmental (air) comparisons and mechanical t...