HIGH-DRAWABILITY STEEL WIRE WITH A PROPORTION BY MASS OF CARBON OF A VALUE WHICH IS GREATER THAN OR EQUAL TO 0.4 % AND LESS THAN OR EQUAL TO 0.5 %
The steel wire of diameter d expressed in mm, has a carbon content by weight C, expressed in %, such that 0.4%≦C≦0.5% and a maximum tensile strength R, expressed in MPa, such that R≧A.(920.C+500)/d 1/2 with A=0.87.
1 - 12 . (canceled)
13 : A steel wire, comprising:
iron; and
carbon,
wherein the carbon is present in the steel wire at a carbon content by weight C of 0.4%≦C≦0.5%, with C being expressed in %, and
wherein a maximum tensile strength R of the steel wire is given by
R≧A .(920. C+ 500)/ d 1/2 ,
with R being expressed in MPa, with A=0.87 or greater, and with d being a diameter of the steel wire expressed in mm.
14 : The steel wire according to claim 13 , wherein 0.4%≦C≦0.5%.
15 : The steel wire according to claim 14 , wherein 0.42%≦C≦0.48%.
16 : The steel wire according to claim 13 , wherein A=1 or greater.
17 : The steel wire according to claim 16 , wherein A=1.10 or greater.
18 : The steel wire according to claim 17 , wherein A=1.30.
19 : The steel wire according to claim 13 , wherein R≧2600 MPa.
20 : The steel wire according to claim 19 , wherein R≧2800 MPa.
21 : The steel wire according to claim 20 , wherein R≧3000 MPa.
22 : The steel wire according to claim 13 , wherein R≦3.7.(920.C+500).
23 : The steel wire according to claim 13 , wherein R≦3.6.(920.C+500).
24 : The steel wire according to claim 13 , wherein R≦3.5.(920.C+500).
25 : The steel wire according to claim 13 , wherein d is greater than or equal to 0.10 mm.
26 : The steel wire according to claim 25 , wherein d is greater than or equal to 0.12 mm.
27 : The steel wire according to claim 13 , wherein d is less than or equal to 0.25 mm.
28 : The steel wire according to claim 27 , wherein d is less than or equal to 0.23 mm.
29 : The steel wire according to claim 13 , wherein a microstructure of the steel wire is ferritic-pearlitic or pearlitic.
30 : The steel wire according to claim 13 , wherein the steel wire is incorporated in a tyre.
31 : The steel wire according to claim 13 , wherein the steel wire is one of a plurality of steel wires arranged together to form a cord.
32 : The steel wire according to claim 13 , wherein the steel wire is embedded in a rubber matrix and is incorporated in a semi-finished product
33 : 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 0.4%≦C≦0.5%, with C being expressed in %, and
wherein a maximum tensile strength R of the steel wire is given by
R≧A .(920. C+ 500)/ d 1/2 ,
with R being expressed in MPa, with A=0.87 or greater, and with d being a diameter of the steel wire expressed in mm.
34 : 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 0.4%≦C≦0.5%, with C being expressed in %, and
wherein a maximum tensile strength R of the steel wire is given by
R≧A .(920. C+ 500)/ d 1/2 ,
with R being expressed in MPa, with A=0.87 or greater, and with d being a diameter of the steel wire expressed in mm.
35 : The tyre according to claim 34 , 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.