Metal treatment – Stock – Ferrous
Patent
1997-04-11
1998-11-10
Yee, Deborah
Metal treatment
Stock
Ferrous
148327, 148597, 152451, 152527, 72700, C21D 806, C22C 3844
Patent
active
058337717
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to tires reinforced with metal wires. The invention relates in particular to tires reinforced with stainless steel wires.
Patent application FR-A-2 096 405 describes very broadly a tire which comprises a reinforcement layer arranged between the layers of the carcass and the rubber tread, the radially outer surface of this layer being reinforced by stainless steel cables. The wires described for producing these cables have inadequate mechanical properties.
SUMMARY OF THE INVENTION
The object of the present invention is a stainless steel wire for reinforcing the crown of tires, this wire being characterised by the following features: at least 6% and at most 10% nickel, at least 16% and at most 20% chromium, the content of molybdenum of the steel being zero or at most equal to 5%, the total of the nickel, chromium and molybdenum being at least 23% and at most 28.5%, all these percentages being % by weight; and it is without austenite or comprises less than 50% by volume thereof.
The invention also relates to the assemblies intended to be used in the crowns of the tires, these assemblies comprising at least one wire according to the invention.
The invention also relates to the reinforcement plies for tire crowns, these plies comprising at least one wire and/or one assembly according to the invention.
The invention also relates to the tires having crowns which comprise at least one wire and/or one assembly and/or one reinforcement ply according to the invention.
The invention also relates to a process for preparing the wire according to the invention, this process being characterised by the following features: least 0.3 mm and at most 3 mm; the steel of the wire comprises at least 0.02% and at most 0.2% carbon, at least 6% and at most 10% nickel, at least 16% and at most 20% chromium, the content of molybdenum of the steel being zero or at most 5%, the total of the nickel, chromium and molybdenum being at least 23% and at most 28.5%, all these percentages being % by weight; the structure of this steel is completely austenitic or practically austenitic; the total deformation .epsilon. being at least 1.5.
DESCRIPTION OF THE DRAWING
The single FIGURE of the drawing shows a schematic of a tire in radial section, that is to say, in section along a plane passing through the axis of rotation of the tire, to help in the explanation of the present invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
The expression "reinforcement" is to be taken in a very broad sense, the reinforcement plies, for example, possibly being either plies which participate essentially mechanically in the reinforcement of the crown of the tires, in particular in the form of triangulation plies, or in the form of protective plies arranged between the triangulation plies and the tread.
I. Definitions and Tests
1. Dynamometric measurements
The measurements of breaking load, tensile strength, modulus and plastic elongation are carried out under traction in accordance with AFNOR method NF A 03-151 of June 1978.
2. Deformation
By definition, the deformation .epsilon. is given by the formula: the wire before this deformation, and S.sub.f being the cross-section of the wire after this deformation.
3. Ductility in torsion
By definition, the ductility in torsion of a wire is the number of twist turns on itself that the wire can withstand. This measurement is effected on a length of wire equal to 500 times its diameter. One end of this wire is held in a fixed jaw, and the other end is held in a rotary jaw, which is turned such that the axis of rotation is the same as the axis of the wire, the tension upon this torsion being equal to 5% of the breaking load of the wire measured before torsion, and the number of twist turns necessary to cause breaking of the wire is counted.
4. Structure of the steels
The identification and the quantification of the structure of the steels are effected in the following manner.
An X-ray diffraction method is used. The method used consists of determining the to
REFERENCES:
patent: 4042423 (1977-08-01), Van de Sype et al.
patent: 5229215 (1993-07-01), Starinshak
patent: 5248353 (1993-09-01), Nishida et al.
patent: 5338620 (1994-08-01), Van Ooij et al.
patent: 5503688 (1996-04-01), Arnaud et al.
Arnaud Jean-Claude
Corsi Patrick
Depraetere Eric
Lamoureux Christian
Compagnie Generale des Etablissements Michelin--Michelin & Cie
Yee Deborah
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