PRE-ALLOYED STEEL POWDER FOR HIGHLY FATIGUE-RESISTANT SINTERED BODY AND CARBURIZED AND QUENCHED MATERIAL

摘要

Wherein the alloy contains at least one of Mo: 0.8-1.5 mass%, Ni: 0.5-1.4 mass% and Cr: 0.5-1.1 mass% as an alloy component, and further contains Mo content [Mo], Ni content [Ni] By satisfying the relation of Mo · Ni · Cr balance expressed by the following formula (1), the content of Cr [Cr] satisfies the relation of Mo · Ni · Cr balance, a sintered body having a good rolling workability can be obtained to such an extent that plastic deformation is possible with a small stress, A prealloyed steel powder for a high fatigue strength sintered body which can obtain a carburized quenched material capable of exhibiting a good fatigue strength after heat treatment such as quenching, and a prealloyed steel powder for a sintered body of high fatigue strength, and a prealloyed steel powder which exhibits good fatigue strength even after carburization tempering tempering To provide a carburizing quenching material. 8.10 [Ni] +3.71 [Mo] +10.25 [Cr]? 14.45 ... (One)