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Pulsed molybdenum ion beams extracted from a metal vapour vacuum arc ion source at voltage of 25kV or 48kV were implanted into H13 steel with a high implantation dose of 5×1017 inons·cm-2 and a time-averaged ion beam current density of about 300μA·cm-2. We have investigated the steel implanted for wear resistance by an optical interference microscope and a pin-on-disc apparatus. The Rutherford backscattering spectroscopy demonstrated that rather low-energy ions could penetrate quite deep into the substrates. It was observed by x-ray photoelectron spectroscopy and transmission-electron microscopy that carbide of molybdenum appeared in the doped region. The results showed that dramatically improved wear resistance of H13 steel after molybdenum ion implantation at 48 kV was attributed to the development of Mo2 C precipitates in the doped zone and to the formation of the implantation affected zone below the doped zone.