Super high tensile steel wire for rubber product reinforcement,

Details Super high tensile steel wire for rubber product reinforcement, Super high tensile steel wire for rubber product reinforcement,

1996-05-15

1999-03-30

Nguyen, Nam

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

428607, 428625, 428677, 152565, 57902, B60C 900

Patent

active

058883215

ABSTRACT:
The steel wire for making steel cord used in rubber product reinforcement has a tensile strength, Y in N/mm.sup.2, such that Y.gtoreq.-1960d+3920, wherein d is the wire diameter in mm, and also a flat Vickers hardness distribution in a cross-section perpendicular to a length direction thereof from the surface to the interior, but excluding a central portion having a central portion diameter corresponding to 1/4 of the wire diameter. The steel wire is made by a method including wet drawing a carbon steel wire rod material containing 0.80 to 0.89% by weight carbon to a predetermined intermediate diameter and subsequently heat-treating and plating to form a final raw material and then wet drawing the final raw material to form the steel wire. The wet drawing steps are performed with drawing dies, each of which is provided with a drawing hole having a drawing hole diameter d.sub.1 and the drawing die has an approach angle 2.alpha. equal to from 8.degree. to 10.degree. and a bearing length of 0.3 d.sub.1. The wet drawing of the final raw material includes a final drawing step performed with a double die and the steel wire immediately after passing through the final drawing die has its temperature controlled so as to be less than 150.degree. C.

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