High strength, ultra fine steel wire having excellent...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 7/06 (2006.01) B24C 1/10 (2006.01) C21D 8/06 (2006.01) C22C 38/18 (2006.01)

Patent

CA 2074068

A high-strength, ultra-fine wire having an excellent workability in stranding, comprising a steel comprised of, in terms of % by weight, 0.85 to 1.10% of C, 0.10 to 0.70% of Si, 0.20 to 0.60% of Mn, 0.10 to 0.60% of Cr, 0.005% or less of Al and optionally at least one member selected from 0.10 to 2.00% of Ni and 0.10 to 3.00% of Co with the balance Fe and unavoidable impurities and, provided thereon, a brass plating, the steel wire having a diameter of 0.1 to 0.4 mm and a tensile strength of 400 kgf/mm2 or more, the surface of the brass plating being provided with indentations having a depth of 2 µm or less at intervals of 50 µm or less in a percentage area of indentations of 10 to 80%; and a process and apparatus for producing a high strength, ultra fine steel wire, comprising subjecting a steel wire material to a patenting treatment, brass plating and wire drawing and subjecting the steel wire material to a shot peening treatment in an air blast system while applying a tension to the steel wire material.

Fil haute résistance ultra-fin possédant une excellente usinabilité pour le toronnage, comprenant un acier composé, en % de son poids, de 0,85 à 1,10 % de C, de 0,10 à 0,70 % de Si, de 0,20 à 0,60 % de Mn, de 0,10 à 0,60 % de Cr, de 0,005 % ou moins de Al, et, optionnellement, d'au moins un de ces éléments, soit de 0,10 à 2,00 % de Ni soit de 0,10 à 3,00 % de Co, le reste étant cnstitué de Fe et des impuretés inévitables et comportant, à sa surface, un laitonnage, le fil d'acier ayant un diamètre de 0,1 à 0,4 mm et une résistance à la traction de 400 kgf/mm2 ou plus, la surface du laitonnage comportant des stries d'une profondeur de 2 micromètres ou moins à des intervalles de 50 micromètres ou moins; les stries occupant de 10 à 80 % de la surface; procédé et dispositif de fabrication d'un fil d'acier haute résistance ultra-fin consistant à soumettre un matériau pour fil d'acier à un traitement de patentage, au laitonnage et au tréfilage puis au grenaillage de précontrainte dans un système à air comprimé tout en y appliquant une tension.

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