Ferritic stainless steel and process for making same

Details Ferritic stainless steel and process for making same Ferritic stainless steel and process for making same

C - Chemistry, Metallurgy

22

C

C22C 38/20 (2006.01) C21D 7/00 (2006.01) C22C 38/22 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01)

Patent

CA 2050315

The present invention relates to a ferritic stainless steel resisting to corrosion in neutral or slightly acid chlorine-containingmedia, which is ductile and shock resistant, characterized by the following weighted chemical composition : 28.5 to 35 % of chromium; 3.5 to 5.50 % of molybdenum; 0.5 to 2 % of copper; less than 0.50 % of nickel; less than 0.40 % of manganese; less than 0.40 % of silicon; less than 0.030 % of carbon; less than 0.030 % of nitrogen; a percentage of titanium and/or niobium at least equal to 0.10 % and lower than 0.60 %; and containing up to 0.10 % of elements added for dioxydation such as aluminium, magnesium, calcium, boron, rare earth materials, the balance being iron and impurities resulting from the fusion of materials necessary for the production.

La présente invention concerne un acier inoxydable ferritique résistant à la corrosion dans des milieux chlorurés neutres ou faiblement acides, ductile et résistant au choc, caractérisé par la composition chimique pondérale suivante: 28,5 à 35 % de chrome, 3,5 à 5,50 % de molybdène, 0,5 à 2 % de cuivre, moins de 0,50 % de nickel, moins de 0,40 % de manganèse, moins de 0,40 % de silicium, moins de 0,030 % de carbone, moins de 0,030 % d'azote, un pourcentage en titane et/ou en niobium au moins égal à 0,10 % et inférieur à 0,60 %, et contenant jusqu'à 0,10 % d'éléments ajoutés pour la désoxydation tels que de l'aluminium, du magnésium du calcium, du bore, des matériaux de terres rares, le reste étant du fer et des impuretés, résultant de la fusion des matières nécessaires à l'élaboration.

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