| 摘要 |
<p>A steel wire (10) adapted for the reinforcement of the bead area of rubber tyres has a diameter d ranging from 0.75 mm to 2.50 mm, a tensile strength lying above 3100 - 600xd MPa, d being expressed in mm, a rubber adherable coating in the form of a copper alloy with a weight ranging from 0.10 to 1.40 grams per kilogram steel wire, and has a surface which is substantially free of residual macro tensile stresses in order to improve the torsional behaviour. The residual macro tensile stresses may be removed by subjecting the steel wire (10) to a series of subsequent bendings over rollers (12). <IMAGE></p> |
