Steels for high-strength springs excellent in cold...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/42 (2006.01)

Patent

CA 2535303

A steel for high-strength springs contains, on the mass basis, 0.35% to 0.65% of C, 1.4% to 2.5% of Si, 0.1% to 1.0% of Mn, 2.0% or less (exclusive of 0%) of Cr, 1.0% or less (exclusive of 0%) of Ni, 1.0% or less (exclusive of 0%) of Cu, 0.020% or less (exclusive of 0%)of P, 0.020% or less (exclusive of 0%) of S, 0.006% or less (exclusive of 0%) of N:, and 0,1% or less (exclusive of 0%) of Al, with the remainder being iron and inevitable impurities, in which Wp(Fe)and W(C) satisfy the following condition: Wp (Fe) > 5 × W (C), wherein Wp (Fe) is the content of Fe (percent by mass) constituting Fe-containing precipitates in the steel; and W (C) is the carbon content (percent by mass) of the steel. The steel is excellent in cold workability and quality stability.

Un acier destiné aux ressorts à haute résistance contient, sur une base de masse, les proportions des éléments qui suivent. 0,35 % à 0,65 % de C, 1,4 % à 2,5 % de Si, 0,1 % à 1 % de Mn, 2,0 % ou moins (à l'exception de 0 %) de Cr, 1,0 % ou moins ( à l'exception de 0 %) de Ni, 1,0 % ou moins ( à l'exception de 0 %) de Cu, 0,020 % ou moins ( à l'exception de 0 %) de P, 0,020 % ou moins ( à l'exception de 0 %) de S, 0, 006 % ou moins ( à l'exception de 0 %) de N, et 0,1 % ou moins ( à l'exception de 0 %) d'Al, le reste étant constitué de fer et des impuretés inévitables, dans lequel le Wp (Fe) et le W (C) satisfont à la condition suivante : Wp (Fe) >5 fois W (C), où Wp (Fe) est le contenu de Fe (pourcentage par masse) constituant en des précipités contenant du Fe dans l'acier; et W (C) est le contenu de carbone (pourcentage par masse) de l'acier. L'acier est excellent en façonnage à froid et en stabilité qualitative.

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