Performance integrity of ductile cast iron (DCI) has been enhanced by different metallurgical approaches. Consequently, in this study, conjoint influence of varied weight percent of copper and section thickness on DCI properties was investigated. The control and 0.05 wt%., 0.35 wt% and 0.85 wt.% of copper alloyed samples were produced using a definite sized rectangular wooden greensand mould and cylindrical wooden pattern with 10 mm, 30 mm and 85 mm section thickness. Optical emission spectrometry (AR 4 30 metal analyzer) was used to determine chemical compositions of the samples and the corresponding carbon equivalent values (CEVs) were calculate using the expression [( CE=%C+1⁄3  %(Si+P)]. Metallurgical microscope (model number NJF-120A) was used to examine the samples’ microstructures. Standard test specimens for tensile, hardness and impact were prepared following ASTM E8, ASTM E 8-04 and ASTM A370 respectively, and the specimens were tested using standard equipment. From the results, the control and copper alloyed samples were comprised silicon as the major element, while the other elements were presnt in trace quantities. Microstructures of all the samples were characterized by spheroidal graphite, which were relatively homogeneously distributed in pearlitic-ferritic matrix, and also visible were graphite nodule of different sizes and spacing. In addition, traces of carbide in relative amounts were present in microstructures of the alloyed samples. Generally, for all section thickness, tensile (UTS and YS) and hardness properties of the alloyed samples were improved over the control samples, while inverse was the case for ductility. Impact energy characteristic of the control samples was high relative to the alloyed samples. Hence, the resulting DCI samples offer better performance under low to medium loading conditions than high loading condition.