In the present work, flux-cored wires of 1.14 Cr-0.5 Mo steel were used to manufacture a multi-layered structure under optimal process parameters using a wire-arc additive manufacturing (WAAM) technique based on gas metal arc welding (GMAW). Optimal parameters were obtained through the passing vehicle search (PVS) algorithm. The multi-layered structure was studied to evaluate its small- and large-scale features, as well as its strength and toughness at different locations within the structure. Microstructures of ferrite and pearlite, typical of low-alloy steels, were observed. A higher proportion of columnar grains and larger uniform grains were noted in the middle portion compared with the bottom. Macrostructural analysis in many regions confirmed defect-free geometries. The two layers were well connected, producing perfect oxidation-free fusion. Furthermore, chrome molybdenum steel exhibited an ultimate tensile strength (UTS) of 890 MPa and a yield strength (YS) of 712 MPa, while GMAW-produced chrome molybdenum steel achieved a UTS of 910 MPa and a YS of 728 MPa. All tensile properties determined by WAAM for the upper and lower zones were within the specified range. Compared with commercially available chrome moly steel, the average impact energy of 5.3 J demonstrated satisfactory strength. These results indicate that the structure fabricated using the GMAW-based WAAM technique meets industrial application requirements.