Hydrogen embrittlement in steels causes changes in mechanical behavior under static and fatigue loads, which is why examining the phenomenon of hydrogen embrittlement is of interest in various industries where steel equipment is exposed to hydrogen. The most important and fundamental topic in studying hydrogen embrittlement is the analysis of hydrogen diffusion in the steel structure. In this work, a micromechanical model based on coupled crystal plasticity and hydrogen diffusion is developed and applied to model hydrogen diffusion and storage in ferrite- pearlite microstructure of A516 Gr.70 steel. Particular emphasis is laid on mechanical influences on hydrogen transport, invoked by internal stresses and by trapping of dislocations generated by plastic strains. Crystal orientations measured by electron backscatter diffraction (EBSD) were mapped onto precise scanning electron microscopy (SEM) micrographs of ferrite and pearlite morphologies. Crystal plasticity model was carried out using the representative volume element (RVE) generated from the EBSD analysis. The homogenized stress–strain curve of the realistic RVE was validated with the experimental data. Based on the ferrite-pearlite structure of the material and the results of EBSD analysis, the developed finite element model was used to investigate the effect of the crack tip location on hydrogen distribution after mechanical loading and using a fracture initiation parameter (FIP), the likelihood of failure at different points was examined. It was determined that the hydrogen concentration and FIP in the pearlite phase are higher than in the ferrite phase; however, the dimensions under maximum hydrogen concentration are larger in the ferrite phase.