C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 1/74 (2006.01) C21D 1/34 (2006.01) C21D 1/72 (2006.01) C22C 38/18 (2006.01) C22C 38/38 (2006.01) C22C 38/58 (2006.01) C23C 8/02 (2006.01) C23C 8/18 (2006.01)
Patent
CA 2355797
Heat resistant stainless steel may be treated in a low oxidizing atmosphere in a heat/soak-heat/soak sequence to deplete its surface of Ni and Cr which tend to catalyze coking of hydrocarbons in contact with the surface of the stainless steel, and enrich it with elements which are inert to coke formation. Parts made of stainless steel, such as furnace tubes or coils, treated in accordance with the present invention when used have a significantly reduced rate of catalytic coking.
Un acier inoxydable thermorésistant peut être traité sous atmosphère faiblement oxydante selon une séquence chauffage/trempage-chauffage/trempage afin de débarrasser sa surface du Ni et du Cr qui tendent à catalyser la cokéfaction des hydrocarbures en contact avec la surface de l'acier inoxydable, et à l'enrichir en éléments qui ne participent pas à la formation de coke. Les pièces fabriquées avec cet acier inoxydable, par exemple les tubes et les serpentins d'appareils de chauffage, si elles sont traitées conformément à la présente invention, donnent lieu à un taux considérablement réduit de cokéfaction catalytique lorsqu'elles sont utilisées.
Benum Leslie Wilfred
Oballa Michael C.
Nova Chemicals Corporation
Trott Trevor
LandOfFree
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