PURPOSE: To manufacture a large scale Fe-Cu series powder metallurgical product having excellent strength at low cost by sintering together with a molding mold after packing ferrous powder into the molding mold under non-pressurizing and successively, infiltrating the specific composition of Cu series infiltrant.

CONSTITUTION: The fine powder of pure iron or alloy steel is packed into the compacting mold having the prescribed shape while vibrating under non- pressurizing and sintered under inert gas atmosphere or reducing atmosphere. The Cu series infiltrative material obtd. by adding and containing ≤ 8 wt.% infiltration improving agent of Mn, Zn, etc., to and in mixed material having composition composed of 2-9 wt.% Fe, 3-13 wt.% one or more kinds of Ni, Cr and Mo in total and the balance Cu, is infiltrated to the sintered product. As the other way, the above compositionof infiltrant is laid on the feerous powder green compact and heated under non-oxidizing atmosphere to execute the sinter of green compact and the infiltration of infiltrant at the same time. The sintered product having excellent strength can be manufacture in the simple process at low cost.