US2014186206A1PendingUtilityA1

Ferritic stainless steel for egr system

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Assignee: KIA MOTORS CORPPriority: Dec 31, 2012Filed: Jul 24, 2013Published: Jul 3, 2014
Est. expiryDec 31, 2032(~6.4 yrs left)· nominal 20-yr term from priority
Inventors:Joo-Sung ParkSeung Hyun LeeHo Chul Shin
C22C 38/001C22C 38/22C22C 38/26C22C 38/38C22C 38/06C22C 38/18
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Claims

Abstract

Disclosed is a ferritic stainless steel for an EGR system, more particularly, a ferritic stainless steel for an EGR system which may suppress the ferritic stainless steel from being discolored and which improves the moldability, oxidation resistance, and corrosion resistance by including iron (Fe) as a base material, about 18 to 20% by weight of chromium (Cr) based on a total weight of an alloy, molybdenum (Mo), carbon (C) and niobium (Nb).

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A ferritic stainless steel for an EGR system, comprising: iron (Fe) as a base material, 18 to 20% by weight of chromium (Cr) based on a total weight of an alloy forming the ferritic stainless steel, molybdenum (Mo), carbon (C) and niobium (Nb). 
     
     
         2 . The ferritic stainless steel for an EGR system of  claim 1 , wherein a % by weight of the niobium (Nb) is about 5 times the % by weight of carbon (C) based on the total weight of the alloy. 
     
     
         3 . The ferritic stainless steel for an EGR system of  claim 1 , comprising about 0.2 to 0.7% by weight niobium (Nb) based on the total weight of the alloy. 
     
     
         4 . The ferritic stainless steel for an EGR system of  claim 1 , further comprising:
 nitrogen (N),
 wherein the carbon (C) is present in an amount of more than 0 and up to about 0.02% by weight, and the nitrogen (N) is present in an amount of more than 0 and up to about 0.01% by weight based on the total weight of the alloy. 
   
     
     
         5 . The ferritic stainless steel for an EGR system of  claim 1 , further comprising:
 aluminum (Al),
 wherein the molybdenum (Mo) is present in an amount of about 0.75 to 1.5% by weight, and aluminum (Al) is present in an amount of about 0.3 to 0.8% by weight. 
   
     
     
         6 . The ferritic stainless steel for an EGR system of  claim 1 , which does not include titanium (Ti). 
     
     
         7 . The ferritic stainless steel for an EGR system of  claim 1 , wherein the ferritic stainless steel is applied to an EGR cooler, an EGR pipe, an EGR valve or an EGR bracket.

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