Cast austenitic stainless steel

Abstract

An austenitic stainless cast steel having a volume fraction of a ferrite phase of 0.1-5.0%.

1 . An austenitic stainless cast steel having a volume fraction of a ferrite phase of 0.1-5.0%. 
     
     
         2 . The austenitic stainless cast steel according to  claim 1 , comprising: 0.01-0.10 percent by mass of C; 0.6-1.0 percent by mass of Si; 2.0-2.8 percent by mass of Mn; and 0.1-0.4 percent by mass of N. 
     
     
         3 . The austenitic stainless cast steel according to  claim 1  or  2 , comprising: 18.0-24.0 percent by mass of Cr; 8.0-15.0 percent by mass of Ni; and 0.2-0.7 percent by mass of Nb. 
     
     
         4 . An austenitic stainless cast steel, comprising:
 a volume fraction of a ferrite phase is 0.1-5.0%, and 0.1-0.10 percent by mass of C; 0.6-1.0 percent by mass of Si; 2.0-2.8 percent by mass of Mn; 0.1-0.4 percent by mass of N; 18.0-24.0 percent by mass of Cr; 8.0-15.0 percent by mass of Ni; 0.2-0.7 percent by mass of Nb; and the balance is Fe and inevitable impurities.   
     
     
         5 . The austenitic stainless cast steel according to  claim 1 , obtained by cooling a melted metal component from a temperature range of 1,150-1,350° C. to a temperature range of 600-800° C. at a cooling rate of 30° C./min or more. 
     
     
         6 . A valve formed of comprising the austenitic stainless cast steel of  claim 1 .