Alloy steel in which carburization is prevented by processing load and method of manufacturing the same

Abstract

Provided herein is an alloy steel in which carburization is prevented by a processing load, the alloy steel including: about 0.13 to 0.25 wt % of carbon (C), about 0.6 to 1.5 wt % of silicon (Si), about 0.6 to 1.5 wt % of manganese (Mn), about 1.5 to 3.0 wt % of chromium (Cr), about 0.01 to 0.1 wt % of niobium (Nb), about 0.01 to 0.1 wt % of aluminum (Al), about 0.05 to 0.5 wt % of vanadium (V), the balance iron (F), and impurities, based on the total weight of the alloy steel.

1 . An alloy steel in which carburization is prevented by a processing load, the alloy steel comprising:
 about 0.13 to 0.25 wt % of carbon (C),   about 0.6 to 1.5 wt % of silicon (Si),   about 0.6 to 1.5 wt % of manganese (Mn),   about 1.5 to 3.0 wt % of chromium (Cr),   about 0.01 to 0.1 wt % of niobium (Nb),   about 0.01 to 0.1 wt % of aluminum (Al),   about 0.05 to 0.5 wt % of vanadium (V),   the balance iron (F), and
 impurities, 
   based on the total weight of the alloy steel.   
     
     
         2 . The alloy steel of  claim 1 , wherein X is a value calculated by the following Equation 1:
   X=wt % of Si+wt % of ½×Mn+wt % of 2×Cr  [Equation 1]
   wherein the value of X is 4.9 to 6.5 wt %.   
     
     
         3 . The alloy steel of  claim 1 , wherein a surface of the alloy steel comprises an oxide film formed by a processing load. 
     
     
         4 . The alloy steel of  claim 1 , wherein the surface structure of the alloy steel comprises a low-carbon martensite structure. 
     
     
         5 . The alloy steel of  claim 4 , wherein the surface structure comprises about 0.4 wt % or less of carbon. 
     
     
         6 - 17 . (canceled)