ALLOY STEEL POWDERS FOR INJECTION MOLDING USE, THEIR COMPOUNDS AND A METHOD FOR MAKING SINTERED PARTS FROM THE SAME

摘要

There is provided alloy steel powders for the injection molding use manufactured by the atomizing method which are characterized by their substantially spherical particle shape and average particle diameters of 20 microns or less, a compound for the injection molding use which contains the alloy steel powders and one or more organic binders, a process for manufacturing sintered materials in performing injection molding of compound and subsequently debinding the obtained injection molded part followed by sintering the debound part, at least the first stage of the sintering step is performed in reduced pressure atmosphere, and the sintered material having a relative density ratio of 92 % or more.