Cold work steel

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 33/02 (2006.01) C22C 38/00 (2006.01) C22C 38/12 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01)

Patent

CA 2448799

A cold work steel has the following chemical composition in weight-%: 1.25 - 1.75 % (C+N), however at least 0.5 % C 0.1 - 1.5 % Si 0.1 - 1.5 % Mn 4.0 - 5.5 % Cr 2.5 - 4.5 % (Mo+W/2), however max. 0.5 % W 3.0 - 4.5 % (V+Nb/2), however max. 0.5 % Nb max 0.3 % S balance iron and unavoidable impurities, and a microstructure which in the hardened and tempered condition of the steel contains 6-13 vol-% of vanadium-rich MX-carbides, -nitrides and/or carbonitrides which are evenly distributed in the matrix of the steel, where X is carbon and/or nitrogen, at least 90 vol-% of said carbides, nitrides and/or carbonitrides having an equivalent diameter, Deq, which is smaller than 3.0 ~m; and totally max. 1 vol-% of other, possibly existing carbides, nitrides or carbonitrides.

L'invention concerne un acier d'écrouissage possédant la composition chimique suivante en pourcentages en poids: 1,25 à 1,75 % (C+N), mais au moins 0,5 % C ; 0,1 à 1,5 % Si ; 0,1 à 1,5 % Mn ; 4,0 à 5,5% Cr ; 2,5 à 4,5 % (Mo+W/2), mais 0,5 % W max ; 3,0 à 4,5 % (V+Nb/2), mais 0,5 % Nb max ; 0,3 % S max, le reste étant du fer et des impuretés inévitables, et une microstructure qui, à l'état durci et revenu de l'acier, contient 6 à 13 volumes % de carbures, de nitrures, et ou de carbonitrures MX riches en vanadium, distribués de manière bien répartie dans la matrice d'acier, X étant carbone et/ou azote, au moins 90 volumes % desdits carbures, nitrures et/ou carbonitrures, présentant un diamètre équivalent, D¿eq?, inférieur à 3,0 micromètres; et 1 volume % maximal sur le total d'un autre élément, potentiellement des carbures, nitrures ou carbonitrures existants.

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