Metal wire comprising a substrate of steel of work-hardened temp

Details Metal wire comprising a substrate of steel of work-hardened temp Metal wire comprising a substrate of steel of work-hardened temp

1993-08-10

1996-04-02

Kastler, Scott

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

148595, 152451, B60C 900, C21D 109

Patent

active

055036880

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to steel wires and methods of obtaining such wires. These wires are used, for instance, to reinforce plastic or rubber articles, in particular hoses, belts, plies and tires.
The wires of this type which are currently used at the present time are formed of steel containing at least 0.6% carbon, this steel having a work-hardened pearlitic structure. The rupture strength of these wires is about 2800 MPa (megapascals); their diameter generally varies from 0.15 to 0.35 mm and their elongation upon rupture is between 0.4% and 2%. These wires are produced by drawing from an initial wire known as "machine wire" the diameter of which is about 5 to 6 mm, the structure of this machine wire being a hard structure formed of pearlite and ferrite with a high proportion of pearlite, generally above 72%. Upon the production of this wire, the drawing operation is interrupted at least once in order to carry out one or more heat treatments which make it possible to regenerate the initial structure. After the last heat treatment, a deposit of alloy, for instance brass, on the wire is necessary in order for the final drawing operation to take place correctly.
This method has the following drawbacks: high; the machine wire and the final diameter are kept within rigid limits, the method therefore lacking flexibility; structure makes the drawing difficult before the heat treatment so that the deformation rate .epsilon. of this drawing is necessarily less than 3; furthermore, the speeds of this drawing are low and there may be breaks of the wire upon this operation; necessary for the process and it is not integrated in the heat-treatment step which precedes it.
Furthermore, the wires themselves have a rupture strength and ductility upon rupture which is at times insufficient, and they exhibit extensive damage as a result of the drawing prior to the heat treatment, due to the great hardness of the machine wire.
The purpose of the present invention is to provide a work-hardened steel wire which is coated with a metal alloy, the steel of this wire having a work-hardened non-pearlitic structure and having a rupture strength and elongation upon rupture at least as great as the known work-hardened pearlitic steel wires and less damage from the drawing than the known wires.
Another object of the invention is to propose a method for the production of this wire which does not have the drawbacks indicated above.
The metal wire of the invention, which comprises a substrate and a coating, has the following characteristics: least 0.05% and at most 0.6%; tempered martensite; mm;
The method of the invention for the production of this coated steel wire is characterized by the following points: content equal to at least 0.05% and to at most 0.6%, said steel comprising 28% to 96% proeutectoid ferrite and 72% to 4% pearlite; the deformation rate .epsilon. of this work hardening being at least 3; out on the work-hardened wire, this treatment consisting of heating the wire to above the AC3 transformation point in order to impart to it a homogeneous austenite structure, whereupon it is recooled rapidly to below the martensite transformation finish point M.sub.F, the rate of this cooling being equal to at least 150.degree. C./second, so as to obtain a structure comprising more than 90% martensite; deposited on the wire, the steel thus serving as substrate; and at most 0.5 T.sub.F so as to cause the formation by diffusion of an alloy of these deposited metals, as well as the formation, for the steel, of a structure comprising more than 90% tempered martensite, T.sub.F being the melting point of the steel, expressed in Kelvin; wire upon this work hardening being less than 0.3 T.sub.F, the deformation rate .epsilon. of this work hardening being equal to at least 1.
The invention also concerns the assemblages comprising at least one wire in accordance with the invention.
The invention also concerns articles reinforced at least in part by wires or assemblages in accordance with the above definitions, such articles being, for inst

REFERENCES:
patent: 4106957 (1978-08-01), Tournoy
patent: 4265678 (1981-05-01), Hachisuka et al.
patent: 5338380 (1994-08-01), Yutori et al.

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