BEAD CORD FOR A PNEUMATIC TIRE

摘要

A bead cord which is lightweight and inexpensive, high in formability, and includes an annular core that is high in corrosion resistance. The bead cord which is lightweight and inexpensive and high in formability includes an annular core 1 and a wrap wire 2 helically wrapped around the annular core 1, the annular core 1 being made of a medium carbon steel or an alloy steel having a lower C content and containing specific elements in suitable amounts, and having a diameter d c that satisfies the following relation 1.04 ‰¦ d C / d S ‰¦ 1.30 with respect to the diameter ds of the wrap wire 2, the wrap wire 2 having a coil diameter D S which is 0.5 to 1.3 times the coil diameter D C of the annular core 1. In order to improve the corrosion resistance of the annular core 1, the annular core 1 may be formed with a plating layer 4 of an Al-Zn alloy or a thick plating layer 4 of Zn, or the annular core 1 may be made of stainless steel.