C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 1/74 (2006.01) C21D 3/02 (2006.01) C21D 6/00 (2006.01) C23C 8/14 (2006.01) H01M 8/02 (2006.01)
Patent
CA 2677807
A method of reducing the formation of electrically resistive scale on a an article comprising a silicon-containing ferritic stainless subjected to oxidizing conditions in service includes, prior to placing the article in service, subjecting the article to conditions under which silica, which includes silicon derived from the steel, forms on a surface of the steel. Optionally, at least a portion of the silica is removed from the surface to placing the article in service. A ferritic stainless steel alloy having a reduced tendency to form silica on at least a surface thereof also is provided. The steel includes a near-surface region that has been depleted of silicon relative to a remainder of the steel.
L'invention concerne un procédé pour réduire la formation de calamine électriquement résistive sur un article comprenant un acier inoxydable ferritique contenant du silicium soumis à des conditions d'oxydation en service comprend, prélablement au mise en service de l'article, à soumettre l'article à des conditions dans laquelle de la silice, qui comprend du silicium dérivé de l'acier, se forme sur une surface de l'acier. Eventuellement, au moins une partie de la silice est éliminée de la surface prélablement à la mise en service de l'article. L'invention concerne également un alliage d'acier inoxydable ferritique présentant une tendance réduite à former de la silice sur au moins une surface. L'acier comprend une zone proche de la surface qui a été épuisée en silicium relativement au reste de l'acier.
Ati Properties Inc.
Riches Mckenzie & Herbert Llp
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