| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron-base powder mixture having excellent packing property and excellent compressibility. SOLUTION: The iron-base powder mixture has >=3.1 Mg/m3 apparent density and consists of iron-base powder having surface to which alloying powder or further machinability-improving powder is allowed to adhere by means of a binder, and a free lubricant. The iron-base powder is composed of atomized iron powder having particle-size distribution containing <=0.5 mass% of particles of >=180μm particle size, preferably maximum particle size being <180μm, <=18.5 mass% of particles of at least <45μm particle size, >=46 mass% of particles of 75-<150μm particle size, and <10 mass% of particles of 150-<180μm particle size or a powder mixture consisting of the atomized iron powder and reduced iron powder. Further, the atomized iron powder has >=2.85 Mg/m3 apparent density.
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