Ferrite-based spheroidal graphite cast iron and exhaust system component using the same

Abstract

The present invention provides a ferrite-based spheroidal graphite cast iron containing the following elements in the following contents in % by weight: C: 3.1 to 4.0%; Si: 3.6 to 4.6%; Mo: 0.3 to 1.0%; V: 0.1 to 1.0%; Mn: 0.15 to 1.6%; and Mg: 0.02 to 0.10%, and the total content of V and Mn is 0.3 to 2.0 wt %, and an exhaust system component using the spheroidal graphite cast iron. Thus, the ferrite-based spheroidal graphite cast iron having higher heat resistance than that of a conventional high Si spheroidal graphite cast iron that can be produced inexpensively by a simple method.

What is claimed is:  
     
         1 . A ferrite-based spheroidal graphite cast iron comprising C, Si, Mo, V, Mn, and Mg, wherein a remaining portion is composed of Fe and inevitable impurities.  
     
     
         2 . The ferrite-based spheroidal graphite cast iron according to  claim 1 , wherein 
 contents of the elements in % by weight are as follows: 
 C: 3.1 to 4.0%;  
 Si: 3.6 to 4.6%;  
 Mo: 0.3 to 1.0%;  
 V: 0.1 to 1.0%;  
 Mn: 0.15 to 1.6%; and  
 Mg: 0.02 to 0.10%.  
   
     
     
         3 . The ferrite-based spheroidal graphite cast iron according to  claim 1  or  2 , wherein a total content of V and Mn is 0.3 to 2.0 wt %.  
     
     
         4 . The ferrite-based spheroidal graphite cast iron according to any one of  claims 1  to  3 , wherein a Si/CE value is 0.97 or less.  
     
     
         5 . An exhaust system component produced using the ferrite-based spheroidal graphite cast iron according to any one of  claims 1  to  4 .  
     
     
         6 . The exhaust system component according to  claim 5 , wherein the exhaust system component is an exhaust manifold, a turbo housing, a turbo housing-integrated exhaust manifold, or a turbo outlet pipe.