Patent ID: 6203753
Filing Date: 2001-03-20
Classification: B22F,C22C

Abstract:
A method of making a sintered metal part from a metal powder composition comprising an iron-based metal powder and an amide lubricant, the metal powder composition containing carbon in an amount from 0.3 to 0.8 weight percent, the method comprising the steps of:(a) compacting the composition at a temperature within the range of from 212.degree. to 350.degree. F.;(b) pre-sintering the compacted composition at a temperature within the range of from 1350.degree. to 1580.degree. F.;(b) lubricating the pre-sintered part with a lubricant;(c) recompacting the compacted and pre-sintered composition; and(d) sintering the recompacted composition at a temperature of 2000.degree. to 2400.degree. F. in a N.sub.2 atmosphere incorporating up to about 75% hydrogen by volume.