Patent ID: 9611525
Date: 2017-04-04
CPC Classifications: C21D,C22C,F02M,F28D,F28F

Claim:
1. A ferritic stainless steel for a biofuel supply system part comprising, by mass %: C: 0.03% or less; N: 0.03% or less; Si: more than 0.1% to 1% or less; Mn: 0.02% to 1.2%; Cr: 15% to 23%; Al: 0.002% to 0.5%; and either one or both of Nb and Ti, with the remainder being Fe and unavoidable impurities, wherein Expression (1) and Expression (2) illustrated below are satisfied, and wherein an oxide film is formed on a surface thereof and carbonitrides containing either one or both Nb and Ti are produced on the surface by heat treatment in a vacuum atmosphere containing N each element symbol represents the content (mass %) of the element in Expression (1) and Expression (2).