Cast iron material, seal material and the production method

Abstract

A cast iron material composed of C, Si, Mn, Ni, Cr and the rest composed of Fe and inevitable impurities, wherein contents of said C, Si, Mn, Ni and Cr with respect to the entire cast iron material are C: 2.9 to 3.8 wt %, Si: 1.0 to 2.5 wt %, Mn: 0 to 0.8 wt % (note that 0 is not included), Ni: 3.5 to 5.0 wt %, and Cr: 2.6 to 5.5 wt %. According to the present invention, a cast iron material having high hardness and excellent wear resistance and a seal material for a floating seal, formed by the cast iron material can be provided.

1 . A cast iron material composed of C, Si, Mn, Ni, Cr and the rest composed of Fe and inevitable impurities, wherein 
 contents of said C, Si, Mn, Ni and Cr with respect to the entire cast iron material are    C: 2.9 to 3.8 wt %,    Si: 1.0 to 2.5 wt %,    Mn: 0 to 0.8 wt % (note that 0 is not included),    Ni: 3.5 to 5.0 wt %, and    Cr: 2.6 to 5.5 wt %.    
     
     
         2 . The cast iron material as set forth in  claim 1 , wherein contents of P and S in said inevitable impurities with respect to the entire cast iron material are 
 P: 0.5 wt % or less and    S: 0.5 wt % or less.    
     
     
         3 . The cast iron material as set forth in  claim 1 , wherein 
 a matrix structure is a structure selected from perlite, bainite and martensite, or a mixed structure of these, and has a fine structure consisting of dendritic cementite and carbides of Cr.    
     
     
         4 . The cast iron material as set forth in  claim 3 , wherein said matrix structure is a mixed structure wherein martensite is the main body.  
     
     
         5 . The cast iron material as set forth in  claim 4 , wherein said matrix structure is a mixed structure of perlite and martensite, wherein martensite is the main body.  
     
     
         6 . The cast iron material as set forth in  claim 1 , wherein hardness of said cast iron material is 62 or higher in HRC.  
     
     
         7 . A seal material formed by the cast iron material as set froth in  claim 1 .  
     
     
         8 . The seal material as set forth in  claim 7 , wherein 
 a sliding surface of said seal material is formed a structure, wherein    the matrix structure is selected from perlite, bainite and martensite or a mixed structure of these, and    a fine structure consisting of dendritic cementite and carbides of Cr is included.    
     
     
         9 . A floating sealing ring formed by the seal material as set froth in  claim 7 .  
     
     
         10 . The floating seal ring as set forth in  claim 9 , wherein 
 on a sliding surface of said floating seal ring is formed a structure, wherein    the matrix structure is selected from perlite, bainite and martensite or a mixed structure of these, and    a fine structure consisting of dendritic cementite and carbides of Cr is included.    
     
     
         11 . A production method of a seal material, including steps of casting in a mold a molten metal composed of C, Si, Mn, Ni, Cr and the rest composed of Fe and inevitable impurities, and curing by cooling, wherein 
 contents of said C, Si, Mn, Ni and Cr with respect to the entire molten metal are    C: 2.9 to 3.8 wt %,    Si: 1.0 to 2.5 wt %,    Mn: 0 to 0.8 wt % (note that 0 is not included),    Ni: 3.5 to 5.0 wt %, and    Cr: 2.6 to 5.5 wt %;    wherein a cooling rate at a position of a sliding surface of said seal material is higher than that on other parts when curing by cooling.