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AssigneeHongduk Industrial Co., Ltd.
InventorsSeong Hun Song, Jae Duk Im, Sung Young Lim
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The present invention relates to a steel cord for rubber reinforcement. In the steel cord of the present invention, cobalt is contained by 0.001 ppm to 0.1 ppm within a 4 nm top-surface of the brass-plated steel wire. A method of manufacturing the steel cord includes: providing a brass-plated steel wire; mixing a cobalt compound in a wet lubricant filled in a wet drawing bath provided with a plurality of drawing dies between one pair of multi-stage drawing cones such that the concentration of the cobalt compound becomes 0.1 ppm to 100 ppm; and causing the cobalt to be contained by 0.001 ppm to 0.1 ppm within a 4 nm top-surface of the brass-plated steel wire after the brass-plated steel wire passes through a final die by causing the cobalt to be attached to a surface of the brass-plated steel wire and alloyed with a brass layer while the brass-plated steel wire is passing through the drawing cones and the drawing dies to be subjected to multi-stage drawing.
A steel cord for rubber reinforcement comprising one or more brass-plated steel wires, wherein cobalt is alloyed with the brass plating layer by a process of wet drawing of the brass-plated steel wire and is present in an amount of about 0.001 ppm to 0.1 ppm within a 4 nm top-surface depth from the surface of the plating layer of the brass-plated steel wire.
A method of manufacturing a steel cord for rubber reinforcement, the method comprising:
Dependencies are inferred from the claim text.