Patent ID: 8795584
Filing Date: 2014-08-05
Classification: B22F,C21D,C22C,Y10T

Abstract:
1. A method of making a small diameter elongated steel article having good machinability and dimensional stability comprising the steps of melting a steel alloy in a melting furnace; atomizing the steel alloy with an inert gas to form a prealloyed steel powder having the following weight percent composition, about and the balance of the alloy is iron and usual impurities: consolidating the steel powder to substantially full density to form a powder compact; hot working the powder compact to form an elongated intermediate article; heating the intermediate article under time and temperature conditions that provide a microstructure characterized by a substantially uniform dispersion of fine carbides and fine sulfides; cold drawing the elongated intermediate article after said heating step to reduce the cross-sectional area of said elongated intermediate article; and then straightening the reduced cross-sectional area article to provide an elongated article having a small cross section for precision machining of parts.