The influence of heat treating on mechanical properties as well as on the sliding wear behavior of sintered Fe-1.5Mo-0.7C steels was experimentally studied. The microstruc-tures of sintered steels change from upper bainite to martensite, tempered martensite, pearlite and lower bainite depending on the heat treating conditions. Heat treating increases the hardness of sintered steels but high tempering temperature, i.e. 700℃, causes the hardness to be even lower than that of the as-sintered ones. The impact energy of sintered steels increases with increasing tempering temperature and arrives the highest at 700℃, while the steels tempered at 200℃ have the highest transverse rupture strength. Austempering results in fair good overall properties, such as hardness, impact energy, and transverse rupture strength. When the sintered steels were austempered, oil-quenched or tempered below 400℃ after quenched, the wear coefficient becomes considerably lower. Fair high hardness, such as HV30 > 380, and structur The influence of heat treating on mechanical properties as well as on the sliding wear behavior of sintered Fe-1.5Mo-0.7C steels was experimentally studied. The microstruc-tures of sintered steels change from upper bainite to martensite, tempered martensite, pearlite and lower bainite depending on the heat treating conditions. Heat treatment increases the hardness of sintered steels but high tempering temperature, ie 700 ° C, causes the hardness to be even lower than that of as- tempering temperature and arrives the highest at 700 ℃, while the steels tempered at 200 ℃ have the highest transverse rupture strength. such as hardness, impact energy, and transverse rupture strength. When the sintered steels were austempered , oil-quenched or tempered below 400 ° C after quenched, the wear coefficient becomes considerably lower. Fair high hardness, such as HV 30> 380, and structur