Sintering metal powder and sintered metal body

Abstract

A sintering metal powder to be used in sintering contains: a composition of ferritic stainless steel; C having a content of 0.05 mass % or more and 1.00 mass % or less; Nb having a content of 0.05 mass % or more and 1.50 mass % or less; and impurities. In addition, C/Nb may be 0.10 or more and 1.80 or less, where C/Nb is a ratio of the content of C to the content of Nb.

What is claimed is: 
     
         1 . A sintering metal powder to be used in sintering, comprising:
 a composition of ferritic stainless steel;   C having a content of 0.05 mass % or more and 1.00 mass % or less;   Nb having a content of 0.05 mass % or more and 1.50 mass % or less; and   impurities.   
     
     
         2 . The sintering metal powder according to  claim 1 , wherein
 C/Nb is 0.10 or more and 1.80 or less, where C/Nb is a ratio of the content of C to the content of Nb.   
     
     
         3 . The sintering metal powder according to  claim 1 , wherein
 C+Nb is 0.20 mass % or more and 1.50 mass % or less, where C+Nb is a sum of the content of C and the content of Nb.   
     
     
         4 . The sintering metal powder according to  claim 1 , wherein
 a content of Si is 0.20 mass % or more and 0.80 mass % or less, and   a content of Cr is 12.0 mass % or more and 30.0 mass % or less.   
     
     
         5 . A sintered metal body comprising:
 a composition of ferritic stainless steel;   C having a content of 0.02 mass % or more and 1.00 mass % or less;   Nb having a content of 0.05 mass % or more and 1.50 mass % or less; and   impurities.   
     
     
         6 . The sintered metal body according to  claim 5 , wherein
 C/Nb is 0.40 or more and 1.80 or less, where C/Nb is a ratio of the content of C to the content of Nb.   
     
     
         7 . The sintered metal body according to  claim 5 , further comprising:
 a dense layer having an average thickness of 150 μm or more on a surface of the sintered metal body.   
     
     
         8 . The sintered metal body according to  claim 5 , wherein
 a potential at which a current density measured according to method B among methods of pitting potential measurement for stainless steel defined in JIS G 0577:2014 is 100 μA/cm 2  is 200 mV or more.