| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ferritic stainless steel sheet excellent in oxidation resistance and desirable for a urea SCR (selective catalytic reduction) system. <P>SOLUTION: The ferritic stainless steel sheet for parts of the urea SCR system comprises, by mass%, 0.010% or less C, 0.020% or less N, 0.5% or less Si, 0.5% or less Mn, 10.0-20.0% Cr, 0.05-0.30% Ti, 1.5% or less Mo, and 0.03-0.5% Al, with the balance comprising Fe and unavoidable impurities and is characterized in that the maximum value of the concentration ratio calculated from the concentrations of Cr, Si, Al, Ti, Mn, and Fe at the portion in the depth of 20 nm or less from the surface has the relationship shown in the following formula: (Cr+Ti+Al)/(Fe+Si+Mn)>0.35, wherein Cr, Ti, Al, Fe, Si, and Mn are the contents [mass%] of Cr, Ti, Al, Fe, Si, and Mn, respectively. <P>COPYRIGHT: (C)2012,JPO&INPIT |
