Patent ID: 7393498

Claim:
A method of producing a toothed sintered metal part having a fatigue strength close to the fatigue strength of said toothed metal part produced from wrought steel or machined from bar stock or forgings comprising the steps of: a) uniaxially compacting an iron or iron-based powder having coarse particles to a density above 7.35 g/cm 3 in a single compaction step at a compaction pressure of at least 700 MPa, wherein less than 10% of the iron-based powder has a particle size less than 45 μm; b) subjecting the part to sintering in a single step at a temperature of at least 1100° C. to a density of at least 7.35 g/cm 3 ; c) subjecting the part to a surface densifying process; and d) subjecting the part to a surface finish improving process.