Steel compositions for special uses

Details Steel compositions for special uses Steel compositions for special uses

C - Chemistry, Metallurgy

22

C

C22C 38/22 (2006.01)

Patent

CA 2654521

The invention concerns steels having excellent resistance over time, in a corrosive atmosphere due to oxidizing environments such as, for example, fumes or water vapour, under high pressure and/or temperature. The invention concerns a steel composition for special applications, said composition containing, by weight, about 1.8 to 11% of chromium (and preferably between about 2.3 and 10% of chromium), less than 1% of silicon, and between 0.20 and 0.45% of manganese. It has been found that it is possible to adjust the contents of the composition based on a predetermined model, selected to obtain substantially optimal properties with respect to corrosion in specific conditions of high temperature performances. Said model can involve as additive of as residue at least one element selected among molybdenum, tungsten, cobalt, and nickel.

On recherche des aciers présentant une excellente tenue dans le temps, sous ambiance de corrosion par des milieux oxydants tels que, par exemple, des fumées ou la vapeur d'eau, sous pression et/ou température élevées. Il est proposé une composition d'acier pour applications spéciales, qui se situe dans la zone comprenant, en teneur en poids, environ 1,8 à 11 % de Chrome (et préférentiellement entre environ 2,3 et 10 % de Chrome), moins de 1 % de Silicium, et entre 0,20 et 0,45 % de Manganèse. Il s'est avéré possible d'ajuster les teneurs de la composition selon un modèle prédéterminé, choisi pour obtenir des caractéristiques de corrosion sensiblement optimales dans des conditions données de performances à haute température. Ce modèle peut faire intervenir comme addition ou comme résiduel au moins un élément choisi parmi le molybdène, le tungstène, le cobalt, et le nickel.

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