Patent ID: 6146760
Filing Date: 2000-11-14
Classification: B60C,C22C,D07B,Y10S,Y10T

Abstract:
A cord of the U+T type for reinforcing elastomeric structures with two groups of filaments in the cord, group T being twisted and group U untwisted with the two groups twisted about each other comprising: at least two filaments in each group, all filaments having the same pitch and twist direction, said cord made of steel having a cord breaking load (CBL) in pounds defined by the expression: CBL=N(720.4D.sup.2 -325.6D.sup.3)CE where CE is cord efficiency in a range of 0.95 to 0.99, D is the filament diameter in millimeters in a range of 0.30 to 0.39 and N is the number of filaments in the cord, said steel for the cord having a composition by weight of between 0.78% and 0.86% to carbon, 0.3% and 1.0% Si and between 0.1% and 0.5% of an alloying element selected from the group consisting of: Cr, Ni, Co, W, Mo, V, N6, and any combination thereof with, the balance of the cord position being iron and residuals.