Martensitic stainless steel and steelmaking process

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 6/00 (2006.01) C21C 5/00 (2006.01) C21D 8/00 (2006.01) C21D 8/02 (2006.01) C22B 9/18 (2006.01) C22C 38/00 (2006.01) C22C 38/32 (2006.01) C22C 38/40 (2006.01) C22C 38/54 (2006.01) C21D 9/18 (2006.01)

Patent

CA 2388021

A process for producing a steel includes subjecting at least a portion of a melt of the steel to electroslag remelting and, in a subsequent step, heating the steel to a temperature at least as great as the lowest temperature at which all carbides that can form in the remelted steel will dissolve and no greater than the nil ductility temperature of the remelted steel, and maintaining the temperature for a period of time sufficient to dissolve primary and clustered carbide particles in the remelted steel greater than 15 micrometers in length. A novel martensitic stainless steel also is disclosed including 0.65 to 0.70 carbon; 0 to 0.025 phosphorus; 0 to 0.020 sulfur; 0.20 to 0.50 silicon; at least one of greater than 0.0004 boron and greater than 0.03 nitrogen; 0.45 to 0.75 manganese; 12.7 to 13.7 chromium; and 0 to 0.50 nickel.

L'invention concerne un procédé d'aciérage consistant à soumettre au moins une partie d'une fonte de l'acier à un procédé de refusion sous laitier, à chauffer l'acier dans une étape consécutive à une température au moins égale à la température minimale à laquelle tous les carbures pouvant se former dans l'acier refondu se dissolvent, et inférieure à la température de ductilité nulle de l'acier refondu, et à maintenir cette température sur une période suffisant à dissoudre les particules de carbures primaires et groupées ayant une longueur supérieure à 15 micromètres dans l'acier refondu. L'invention concerne également un nouvel acier martensitique contenant 0,65 à 0,70 % en poids de carbone, 0 à 0,025 % en poids de phosphore, 0 à 0,020 % en poids de soufre, 0,20 à 0,50 % en poids de silicium, plus de 0,0004 % en poids de bore et/ou plus de 0,03 % en poids d'azote, 0,45 à 0,75 % en poids de manganèse, 12,7 à 13,7 % en poids de chrome, et 0 à 0,50 % en poids de nickel.

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