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During the fabrication of high-tensile steels, it is important to utilize B because the addition of this element even in small amounts (several ppm) dramatically increases the hardenability of steel, which in turn considerably decreases the alloying cost.1,2) It is well known that the segregation of solute B atoms at the austenite grain boundaries increases the hardenability of steels;3–5) however, the precipitation of borides such as BN, Fe23(C, B)6, or Fe2B decreases the hardenability.6–10) Therefore, various methods for preventing the precipitation of these borides have been intensely investigated to ensure the maximum use of solute B atoms. Al or Ti is added to fix the solute N atoms and thus prevent the precipitation of BN,11,12) while Nb and Mo are added to prevent the precipitation of Fe23(C, B)6 and Fe2B. In particular, the improvement of the hardenability of B steels by the addition of Mo is called the “combined Mo-B effect”.14) The features of the combined Mo-B effect in terms of the dependence of Mo and B contents have been investigated. Desalos et al.16) investigated two types of Mo steels, 0.4%Mo and 0.8%Mo, and reported that the presence of Mo strongly enhances the effect of B and has a synergistic Effect of Molybdenum Content on the Combined Effect of Boron and Molybdenum on Hardenability of Low-Carbon Boron-Added Steels