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Stainless steels that contain a large amount of Cr exhibit a superior corrosion resistance at high temperatures as well as at room temperature. This is due to the formation of the protective oxide layer containing Cr. Moreover, they have superior mechanical properties at high temperatures. Therefore, ferritic stainless steels are used as the heat-resistant materials as well as the corrosion-resistant materials.1) In particular, Nb containing ferritic stainless steels show the superior heat resistance due to the effect of the Nb addition on increasing the high temperature strength. Moreover, ferritic stainless steels are relatively low cost, because they do not contain an expensive Ni. Therefore, ferritic stainless steels are used as materials for combustion components.2) Recently, they are extensively used as materials for automotive exhaust systems including exhaust manifolds because of their excellent cost performance.3,4) In this application, superior oxidation resistance is simultaneously required together with the excellent high temperature strength and thermal fatigue resistance. Thus, they usually contain Si and Mn as elements that improve oxidation resistance. The effect of Si on oxidation resistance was studied by many previous researchers.5–11) Si has been recognized as the element improving oxidation resistance. The two kinds Effect of Si Addition on Oxidation Behavior of Nb Containing Ferritic Stainless Steel

Effect of Si Addition on Oxidation Behavior of Nb containing Ferritic Stainless Steel