Abstract: In order to improve comprehensive performance of remanufactured components made of medium carbon Fe-Cr-C alloy, the influence of alloying element Ni, Mn and V on the phase composition of the surfacing alloy was researched by Thermo-Calc calculation software, and then the new flux-cored wire was designed and prepared. Subsequently, the obtained surfacing alloy was tempered at different temperature and holding time. The optimal heat treatment procedure was obtained by observing microstructure and measuring hardness. The results showed that elements Ni and Mn could expand the austenite zone of the surfacing alloy and then improve the toughness, while element V could promote the precipitation of MC carbide, and increase the hardness and wear resistance. The surfacing alloy showed the highest hardness and expressed the most excellent tempering resistance after tempering at 480 °C for 2 h.