Method of manufacturing ferrous metal component

Abstract

A method of manufacturing a ferrous metal component includes: performing an element removal treatment on a workpiece formed of a ferrous metal material; and performing a surface hardening treatment on the workpiece through a carburizing treatment after the element removal treatment. In this method, the element removal treatment is performed under a condition of a higher temperature and a lower pressure than in the carburizing treatment.

1 . A method of manufacturing a ferrous metal component, the method comprising:
 performing an element removal treatment on a workpiece formed of a ferrous metal material, wherein in the element removal treatment, an element which forms an oxide on a surface of the workpiece during a carburizing treatment is evaporated from the surface of the workpiece; and   performing a surface hardening treatment on the workpiece through a carburizing treatment after the element removal treatment, wherein   the element removal treatment is performed under a condition of a higher temperature and a lower pressure than in the carburizing treatment.   
     
     
         2 . (canceled) 
     
     
         3 . The method according to  claim 1 , wherein
 in the element removal treatment, the element is evaporated from the surface of the workpiece in a vacuum.   
     
     
         4 . The method according to  claim 1 , wherein
 the element is at least one of Mn, Si, and Cr.   
     
     
         5 . The method according to  claim 1 , wherein
 after the element removal treatment, the higher temperature of the element removal treatment is decreased to a temperature of the carburizing treatment to perform the carburizing treatment.