The production and manufacture control of high performance materials is one of the main challenges of the scientific community. Materials that exhibit high values of hardness, corrosion resistance, modulus of elasticity (Young's modulus), and chemical inertness with low density are highlighted in numerous applications in the technology and defense industry. The boron carbide (B4C) is one of these materials. Actually the B4C is the third largest known material with hardness, behind only the boron nitride and diamond. Added to the set of properties exhibited by the B4C, the cost and ease way of preparation, compared to diamond and boron nitride [1,2]. These properties turn the B4C excellent choices for the areas of ballistic coating (shields), making control rods for nuclear plants as well as broad use in machining ferrous parts processes. Thus an accurate determination of the mechanical properties is critical to the selection of methods and manufacturing processes B4C. The objective of this work is the use of nanoindentation technique with a Berkovich indenter for determination of hardness and Young's modulus, by Oliver and Pharr method . The completion of the test is to assess the limitations and advantages of the process of characterizing the B4C by nanoindentation test.