Alloy cast iron for producing a seal, seal, and method for producing such a seal

Abstract

Alloy cast iron for a seal, a seal, and a method of manufacturing the seal are provided. The alloy cast iron for a seal includes 3.8 wt % to 4.2 wt % of carbon, 3.3 wt % to 4.7 wt % of nickel, 2 wt % to 5 wt % of molybdenum, 1.2 wt % to 2.0 wt % of silicon, 16 wt % to 18 wt % of chrome, 0.8 wt % to 1.5 wt % of manganese, and the remaining of iron. Therefore, a seal can be produced using a centrifugal casting method and thus productivity of the seal is improved and the seal having excellent abrasion resistance is produced.

What is claimed is: 
     
         1 . A seal comprising 3.8 wt % to 4.2 wt % of carbon, 3.3 wt % to 4.7 wt % of nickel, 2 wt % to 5 wt % of molybdenum, 1.2 wt % to 2.0 wt % of silicon, 16 wt % to 18 wt % of chrome, 0.8 wt % to 1.5 wt % of manganese, and the remaining of iron. 
     
     
         2 . The seal of  claim 1 , wherein a microstructure of the seal comprises 10 to 20% of austenite, 25 to 35% of martensite, and 50 to 60% of carbide. 
     
     
         3 . A method of manufacturing a seal, the method comprising:
 melting alloy cast iron for the seal;   injecting the melted alloy cast iron into a rotation mold;   forming the seal by a rotation of the rotation mold; and   separating the seal from the rotation mold and performing heat treatment of the seal,   wherein the alloy cast iron comprises 3.8 wt % to 4.2 wt % of carbon, 3.3 wt % to 4.7 wt % of nickel, 2 wt % to 5 wt % of molybdenum, 1.2 wt % to 2.0 wt % of silicon, 16 wt % to 18 wt % of chrome, 0.8 wt % to 1.5 wt % of manganese, the remaining of iron, and impurities generated upon melting.   
     
     
         4 . The method of  claim 3 , further comprising grinding and lapping of making uniform a surface roughness of the seal in which heat treatment is performed. 
     
     
         5 . Alloy cast iron for a seal comprising 3.8 wt % to 4.2 wt % of carbon, 3.3 wt % to 4.7 wt % of nickel, 2 wt % to 5 wt % of molybdenum, 1.2 wt % to 2.0 wt % of silicon, 16 wt % to 18 wt % of chrome, 0.8 wt % to 1.5 wt % of manganese, and the remaining of iron.