Powder metal composition

Abstract

A powder metal composition containing 1.0-2.5% Ni, 0.3-0.7% Mo, 0.15-0.30% Mn, 0.5-1.5% Cu, 0.3-0.7% C, 0.50-1.0% zinc stearate, the balance being Fe.

What is claimed is: 
     
       1. A powder metal composition comprising: 1.0-2.5% Ni, 0.3-0.7 Mo, 0.15-0.30 Mn, 0.5-1.5% Cu, 0.3-0.7 C, 0.50-1.0% zinc stearate, the balance being Fe.   
     
     
       2. The composition of claim 1 wherein said amount of Ni is 1.8%, said amount of Mo 0.6%, said amount of Mn is 0.25%, said amount of C is 0.6%, and said amount of zinc stearate is 0.75%. 
     
     
       3. The composition of claim 2 wherein said amount of Cu is 0.82%. .Iadd. 
     
     
       4.  A sintered powder metal composition comprising 1.0-2.5% Ni, 0.3-0.7% Mo, 0.15-0.30% Mn, 0.5-1.5% Cu, 0.3-0.7% C, the balance being Fe. .Iaddend. .Iadd.5. A method for improving the tensile strength, fractured toughness, machineability and dimension stability of a sintered powder metal composition, said composition including 1.0-2.5% Ni, 0.3-0.7% Mo, 0.15-0.30% Mn, 0.3-0.7% C, the balance being Fe, comprising adding to said powder metal composition copper in an amount from 0.5-1.5%. .Iaddend. .Iadd.6. A method according to claim 5 further comprising adding 0.50-1.0% zinc stearate to said composition. .Iaddend.