HIGH-DRAWABILITY STEEL WIRE WITH A PROPORTION BY MASS OF CARBON OF A VALUE WHICH IS GREATER THAN OR EQUAL TO 0.6 % AND LESS THAN OR EQUAL TO 0.74 %
The steel wire of diameter d expressed in mm, has a carbon content by weight C, expressed in %, such that 0.6%≦C≦0.74% and a maximum tensile strength R, expressed in MPa, such that: for d<0.17, R≧A.(920.C+500)/d 1/2 with A=0.96, for 0.17≦d≦0.23, R≧A.(920.C+500)/d 1/2 with A=1.24.
1 - 13 . (canceled)
14 . A steel wire, comprising:
iron; and
carbon,
wherein the carbon is present in the steel wire at a carbon content by weight C of 0.6%≦C≦0.74%, with C being expressed in %, and
wherein a maximum tensile strength R of the steel wire is given by:
for d<0.17, R≧A.(920.C+500)/d 1/2 , with A=0.96 or greater,
for 0.17≦d≦0.23, R≧A.(920.C+500)/d 1/2 , with A=1.24 or greater,
with R being expressed in MPa, and with d being a diameter of the steel wire expressed in mm.
15 . The steel wire according to claim 14 , wherein 0.65%≦C≦0.74%.
16 . The steel wire according to claim 14 , wherein A=1.10 or greater for d<0.17.
17 . The steel wire according to claim 16 , wherein A=1.14 or greater.
18 . The steel wire according to claim 17 , wherein A=1.18 or greater.
19 . The steel wire according to claim 14 , wherein, for 0.17≦d≦0.23, A=1.26 or greater.
20 . The steel wire according to claim 19 , wherein A=1.28 or greater.
21 . The steel wire according to claim 20 , wherein A=1.30 or greater.
22 . The steel wire according to claim 14 , wherein, for d<0.17, R≧2900 MPa.
23 . The steel wire according to claim 22 , wherein R≧3300 MPa.
24 . The steel wire according to claim 23 , wherein R≧3400 MPa.
25 . The steel wire according to claim 14 , wherein, for 0.17≦d≦0.23, R≧3000 MPa.
26 . The steel wire according to claim 25 , wherein R≧3250 MPa.
27 . The steel wire according to claim 26 , wherein R≧3500 MPa.
28 . The steel wire according to claim 14 , wherein R≦3.7.(920.C+500).
29 . The steel wire according to claim 28 , wherein R≦3.6.(920.C+500).
30 . The steel wire according to claim 29 , wherein R≦3.5.(920.C+500).
31 . The steel wire according to claim 14 , wherein d is greater than or equal to 0.10 mm.
32 . The steel wire according to claim 31 , wherein d is greater than or equal to 0.12 mm.
33 . The steel wire according to claim 14 , wherein a microstructure of the steel wire is ferritic-pearlitic or pearlitic.
34 . The steel wire according to claim 14 , wherein the steel wire is incorporated in a tyre.
35 . The steel wire according to claim 14 , wherein the steel wire is one of a plurality of steel wires arranged together to form a cord.
36 . The steel wire according to claim 14 , wherein the steel wire is embedded in a rubber matrix and is incorporated in a semi-finished product.
37 . A cord, comprising:
a plurality of steel wires, each steel wire including:
iron, and
carbon,
wherein the carbon is present in the steel wire at a carbon content by weight C of 0.6%≦C≦0.74%, with C being expressed in %, and
wherein a maximum tensile strength R of the steel wire is given by:
for d<0.17, R≦A.(920.C+500)/d 1/2 , with A=0.96 or greater,
for 0.17≦d≦0.23, R≧A.(920.C+500)/d 1/2 , with A=1.24 or greater, with R being expressed in MPa, and with d being a diameter of the steel wire expressed in mm.
38 . A tyre, comprising:
at least one steel wire, each steel wire including:
iron, and
carbon,
wherein the carbon is present in the steel wire at a carbon content by weight C of 0.6%≦C≦0.74%, with C being expressed in %, and
wherein a maximum tensile strength R of the steel wire is given by:
for d<0.17, R≧A.(920.C+500)/d 1/2 , with A=0.96 or greater,
for 0.17≦d≦0.23, R≧A.(920.C+500)/d 1/2 , with A=1.24 or greater,
with R being expressed in MPa, and with d being a diameter of the steel wire expressed in mm.
39 . The tyre according to claim 38 , further comprising:
a carcass reinforcement,
wherein the tyre is for a heavy-duty type of vehicle, and
wherein the at least one steel wire is incorporated in the carcass reinforcement.