Ferritic stainless steel having reduced carbon sludge adsorption for exhaust system heat exchanger and method of manufacturing same

Abstract

Disclosed are a ferritic stainless steel having reduced carbon sludge adsorption for an exhaust system heat exchanger, and a method of manufacturing same. The ferritic stainless steel having reduced carbon sludge adsorption for an exhaust system heat exchanger, according to one embodiment of the present invention, comprises: 0.003-0.1 wt % of C; 0.01-2.0 wt % of Si; 0.01-1.5 wt % of Mn; 0.05 wt %or less of P; 0.005 wt % of less of S; 10-30 wt % of Cr; 0.001-0.10 wt % of Ti; 0.001-0.15 wt % of Al; 0.003-0.03 wt % of N; 0.3-0.6 wt % of Nb; 0.01-2.5 wt % of Mo; and the remainder being Fe and unavoidable impurities, wherein a TiN precipitate having a size of 0.1 [mu]m or greater is dispersed in an amount of 2.5*104ea / mm<2> or less in a ferrite base of a surface part.

Description

technical field [0001] The present disclosure relates to ferritic stainless steels for exhaust system heat exchangers and methods of making the same, and more particularly, to ferritic stainless steels for exhaust system heat exchangers with reduced carbon sludge adsorption Stainless steel and method of manufacturing said ferritic stainless steel. Background technique [0002] In recent years, as awareness of environmental issues has increased, exhaust gas regulations have become stricter and stricter limits have been set on carbon dioxide emissions in the automotive field. In addition to developing alternative fuels such as bioethanol and biodiesel, attempts have been made to reduce vehicle weight or install heat exchangers to recover waste heat or install exhaust gas treatment systems such as exhaust gas recirculation (EGR) systems, diesel particulate filtration (DPF) and Selective Catalytic Reduction (SCR) systems) to improve fuel efficiency. [0003] Here, the EGR syst...

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