WO2016095199A1 - High-strength bead wire - Google Patents

High-strength bead wire Download PDF

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Publication number
WO2016095199A1
WO2016095199A1 PCT/CN2014/094341 CN2014094341W WO2016095199A1 WO 2016095199 A1 WO2016095199 A1 WO 2016095199A1 CN 2014094341 W CN2014094341 W CN 2014094341W WO 2016095199 A1 WO2016095199 A1 WO 2016095199A1
Authority
WO
WIPO (PCT)
Prior art keywords
bead wire
wire
bead
less
resin
Prior art date
Application number
PCT/CN2014/094341
Other languages
French (fr)
Inventor
Jianhui GONG
Jinjun GU
Guy ANNE
Original Assignee
Nv Bekaert Sa
Bekaert (China) Technology Research And Development Co. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nv Bekaert Sa, Bekaert (China) Technology Research And Development Co. Ltd. filed Critical Nv Bekaert Sa
Priority to PCT/CN2014/094341 priority Critical patent/WO2016095199A1/en
Publication of WO2016095199A1 publication Critical patent/WO2016095199A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/066—Reinforcing cords for rubber or plastic articles the wires being made from special alloy or special steel composition
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B60C2015/042—Bead cores characterised by the material of the core, e.g. alloy
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D07B2201/2011—Wires or filaments characterised by a coating comprising metals
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D07B2201/2012—Wires or filaments characterised by a coating comprising polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D07B2201/2013—Wires or filaments characterised by a coating comprising multiple layers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D07B2205/3046—Steel characterised by the carbon content
    • D07B2205/3057—Steel characterised by the carbon content having a high carbon content, e.g. greater than 0,8 percent respectively SHT or UHT wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3085—Alloys, i.e. non ferrous
    • D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3085—Alloys, i.e. non ferrous
    • D07B2205/3092—Zinc (Zn) and tin (Sn) alloys
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/202—Environmental resistance
    • D07B2401/2025—Environmental resistance avoiding corrosion
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2095—Improving filler wetting respectively or filler adhesion

Definitions

  • the invention relates to a bead wire adapted for the reinforcement of the bead area of rubber tires, more particularly, a high-strength bead wire with high elongation and dedicatedsteel composition.
  • a pneumatic tire generally comprises a crown that comes into contact withthe ground and, on either side of the crown, a sidewall the inner edge of which, intended to be supported by the rim of a wheel, is formed by the bead.
  • the bead has among its components at least one bead core. The latter fulfils various functions. It serves in particular as anchorage for the ply or plies forming the carcass of the tire and withstands the forces exerted on it by the carcass under the effect of the inflation pressure and the deformations resulting from the travel of the tire.
  • the bead core also serves to ensure the transmission of longitudinal forces and, in the case of tubeless tire, to ensure a seal between the tire and the wheel rim.
  • Rubberized bead is made by winding rubberized wires according to US1914040A or US2149079A.
  • Cable bead is made by winding wires spirally around an annular welded core according to US1565616A or GB1100686A.
  • Hexagonal or shaped bead core is made by winding wires with circular cross-section into multiply turns and forming a hexagonal or shaped cross-section of the bead core.
  • bead core is made of bead wire with circular cross-section.
  • High-strength bead wire is used to reinforce the bead of rubber tyres to reduce the weight of the bead structure while maintaining the same breaking load. But the high deformation and intensive work-hardening for high-strength bead wire may result in bad torsional behaviour and low elongation.
  • Prior art EP0611669A1 discloses a solution to improve the torsional behaviour with a supplementary treatment of applying residual macro compressive stresses.
  • Prior art US2010/126643A1 discloses a high strength steel wire with superior ductility and twistability wherein the steel composition comprises chemical ingredients of Mo, W, N, O, B, and may further comprise Cr,Ni, Co, V, Cu, and Nb.But above prior arts also have drawbacks.
  • Prior art EP0611669A1 requests a supplementary treatment to apply residual macro compressive stresses on the steel wire, while the consecutive bends on the steel wire may finally reduce the tensile strength of the steel wire.
  • Prior art US2010/126643A1 requests special steel composition and expensive chemical ingredients, for example, Mo, W, Co, V, and Nb. Therefore, there is a need to provide a high-strength bead wire with superior ductility and inexpensive steel composition.
  • the object of the invention is to provide a high-strength bead wire with high elongation and dedicated steel composition.
  • a bead wire is adapted for the reinforcement of the bead area of rubber tires.
  • the bead wire hasa diameter d ranging from 0.75mm to 2.50mm.
  • the bead wire hasa tensile strength ranging from 2950-440d to 3300-560d MPa, while d is expressed in mm.
  • the bead wire comprisesfollowing chemical components by mass %, C:0.80 to 0.85%, Si:0.15 to 0.35%, Mn: 0.60 to 0.90%, P:0.025% or less, S:0.025% or less, Cr:0.25% or less, Ni:0.20% or less, Cu: 0.20% or less, and a balance of Fe and unavoidable impurities.
  • the tensile strength of the bead wire may range from 3040-457d to 3054-436d MPa, while d is expressed in mm.
  • the diameter of the bead wire may range from 1.30mm to 2.20mm.
  • the ratio of Rp0.2/Rm of the bead wire may range from 90% to 96%.
  • the elongation at break of the bead wire may range from 5.9% to 7.7%, and the average elongation at break of the bead wire may be more than 6.5%.
  • the number of torsions before fracture of the bead wire may range from 34 to 41, and the average number of torsions before fracture of the bead wire may be more than 36.
  • the bead wire may have a copper alloy coating to promote the adhesion between bead wire and rubber, and the copper alloy coating may be bronze or brass.
  • the bead wire may be coated with a resin coating comprising a corrosion inhibiting reagent on the copper alloy coating.
  • the corrosion inhibiting reagent means a substance which reacts with the copper alloy coating or exposed steel surface of the bead wire so as to promote and/or retain adhesion between bead wire and rubber, and/or to improve the resistance of bead wire to corrosion.
  • the corrosion inhibiting reagent in the resin coating may amounts between 10% and 90% in weight, and preferably between 20% and 40% in weight.
  • the resin coating comprising corrosion inhibiting reagent may be coated on the copper alloy coating in an amount corresponding to between 50 and 300 mg/m 2 , and preferably between 150 and 200 mg/m 2 .
  • the corrosion inhibiting reagent can be Benzotriazole.
  • the resin can be hydrocarbon resin or phenolic resin, and the hydrocarbon resin can be cumar resin.
  • a bead wire adapted for the reinforcement of the bead area of a tire can be manufactured as follows.
  • a wire rod having followingchemical components by mass % is chosen as a start material, C:0.80 to 0.85%, Si:0.15 to 0.35%, Mn:0.60 to 0.90%, P:0.025% or less, S:0.025% or less, Cr:0.25% or less,Ni:0.20% or less, Cu:0.20% or less, and a balance of Fe and unavoidable impurities.
  • the wire rod with a diameter of about 5.5mm or 6.5mm is cold drawn in a conventional way to an intermediate diameter and subjected to a well-known patenting treatment.After patenting, the steel wire is further drawn to its final diameter. This deformation determines, together with the steel composition, to a large extent the final tensile strength.
  • the steel wire is subsequently subjected to a stress-relieving treatment, e.g. by annealing the steel wire.
  • the annealing treatment may lower the tensile strength but improves the torsion behaviour.
  • a plating is further applied to the steel wire in order to provide the steel wire with a bronze or brass coating. This plating can done in a chemical and/or an electro-chemical way.
  • Cis limited between 0.80% and 0.85% and Si between 0.15% and 0.35%.
  • C and Si are elements effective in increasing strength. If the content of C is less than 0.80%, it becomes difficult to stably give a high tensile strength above 2950-440d to the bead wire.
  • Si is an element useful as a deoxidizing agent and an element necessary when dealing with steel not containing Al. If the content of Si is less than 0.15%, the deoxidizing effect is too small. On the other hand, C content more than 0.85% and Si content more than 0.35% may deteriorate the drawability and ductility of the bead wire. Therefore, C between 0.80% and 0.85% and Si between 0.15% and 0.35% make a balance between the high tensile strength and the drawability and ductility of the bead wire.
  • Mn is also an element useful as a deoxidizing agent. Further, Mn is effective in improving hardenability and increasing the strength of steel rod. Further, Mn fixes S in the steel as MnS and prevents hot embrittlement. Last but not least, Mn can replace the other expensive elements, for example, Mo, W, Co, V, and Nb. To achieve above effects, Mn content is no less than 0.60%. If Mn is more than 0.90%, martensite and bainite may form in the wire rod during or after patenting, whereby deteriorate the drawability of the wire rod. Therefore, Mn content between 0.60% and 0.90% provides a high-tensile strength bead wire with good ductility and cheap ingredients.
  • P and S are impurities, and it is preferred to limit the content to be no more than 0.025% each to secure the ductility of the bead wire.
  • ingredients may be added to further improve the property of the bead wire.
  • Cr is an element effective in improving the strength of the steel rod and the drawability of the steel rod.
  • the content of Cr can be less than 0.25%, or less than 0.10%, or even without Cr.
  • Ni is an element that does not contribute much to increase the strength of the bead wire, but increases the toughness.
  • the content of Ni can be less than 0.25%, or less than 0.10%, or even without Ni.
  • the content of Cu can be less than 0.20%, or less than 0.10%, or even without Cu.
  • the present invention chooses a steel composition with specific scopes to provide a high-strength bead wire with high elongation and simple steel composition.
  • the bead wire can be further coated with a resin coating comprising a corrosion inhibiting reagent on the copper alloy coating according to prior art CN103991340A to further improve the adhesion between bead wire and rubber and the corrosion-resistance of the bead wire.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Ropes Or Cables (AREA)
  • Tires In General (AREA)

Abstract

A bead wire adapted for the reinforcement of the bead area of rubber tires, wherein the bead wire has a diameter d ranging from 0.75mm to 2.50mm, and has a tensile strength ranging from 2950-440d to 3300-560d MPa, d being expressed in mm. The bead wire comprises following chemical components by mass％, C: 0.80 to 0.85％, Si: 0.15 to 0.35％, Mn: 0.60 to 0.90％, P: 0.025％or less, S: 0.025％or less, Cr: 0.25％or less, Ni: 0.20％or less, Cu: 0.20％or less, and a balance of Fe and unavoidable impurities. This high-strength bead wire has high elongation with simple steel composition.

Description

Title:HIGH-STRENGTH BEAD WIRE Description Technical Field
The invention relates to a bead wire adapted for the reinforcement of the bead area of rubber tires, more particularly, a high-strength bead wire with high elongation and dedicatedsteel composition.
Background Art
A pneumatic tire generally comprises a crown that comes into contact withthe ground and, on either side of the crown, a sidewall the inner edge of which, intended to be supported by the rim of a wheel, is formed by the bead. The bead has among its components at least one bead core. The latter fulfils various functions. It serves in particular as anchorage for the ply or plies forming the carcass of the tire and withstands the forces exerted on it by the carcass under the effect of the inflation pressure and the deformations resulting from the travel of the tire. The bead core also serves to ensure the transmission of longitudinal forces and, in the case of tubeless tire, to ensure a seal between the tire and the wheel rim.
There exist several types of bead cores.
Rubberized bead is made by winding rubberized wires according to US1914040A or US2149079A.
Cable bead is made by winding wires spirally around an annular welded core according to US1565616A or GB1100686A.
Hexagonal or shaped bead core is made by winding wires with circular cross-section into multiply turns and forming a hexagonal or shaped cross-section of the bead core. In all, bead core is made of bead wire with circular cross-section.
High-strength bead wire is used to reinforce the bead of rubber tyres to reduce the weight of the bead structure while maintaining the same breaking load. But the high deformation and intensive work-hardening for high-strength bead wire may result in bad torsional behaviour and low  elongation.
Prior art EP0611669A1 discloses a solution to improve the torsional behaviour with a supplementary treatment of applying residual macro compressive stresses.
Prior art US2010/126643A1 discloses a high strength steel wire with superior ductility and twistability wherein the steel composition comprises chemical ingredients of Mo, W, N, O, B, and may further comprise Cr,Ni, Co, V, Cu, and Nb.But above prior arts also have drawbacks.
Prior art EP0611669A1 requests a supplementary treatment to apply residual macro compressive stresses on the steel wire, while the consecutive bends on the steel wire may finally reduce the tensile strength of the steel wire.
Prior art US2010/126643A1 requests special steel composition and expensive chemical ingredients, for example, Mo, W, Co, V, and Nb. Therefore, there is a need to provide a high-strength bead wire with superior ductility and inexpensive steel composition.
Disclosure of Invention
The object of the invention is to provide a high-strength bead wire with high elongation and dedicated steel composition.
According to the present invention, a bead wire is adapted for the reinforcement of the bead area of rubber tires. The bead wire hasa diameter d ranging from 0.75mm to 2.50mm. The bead wire hasa tensile strength ranging from 2950-440d to 3300-560d MPa, while d is expressed in mm. The bead wire comprisesfollowing chemical components by mass ％, C:0.80 to 0.85％, Si:0.15 to 0.35％, Mn: 0.60 to 0.90％, P:0.025％ or less, S:0.025％ or less, Cr:0.25％ or less, Ni:0.20％ or less, Cu: 0.20％ or less, and a balance of Fe and unavoidable impurities.
Preferably, the tensile strength of the bead wire may range from 3040-457d to 3054-436d MPa, while d is expressed in mm.
The diameter of the bead wire may range from 1.30mm to 2.20mm.
The ratio of Rp0.2/Rm of the bead wire may range from 90％ to 96％.
The elongation at break of the bead wire may range from 5.9％ to 7.7％, and the average elongation at break of the bead wire may be more than 6.5％.
The number of torsions before fracture of the bead wire may range from 34 to 41, and the average number of torsions before fracture of the bead wire may be more than 36.
The bead wire may have a copper alloy coating to promote the adhesion between bead wire and rubber, and the copper alloy coating may be bronze or brass.
Alternatively the bead wire may be coated with a resin coating comprising a corrosion inhibiting reagent on the copper alloy coating. The corrosion inhibiting reagent means a substance which reacts with the copper alloy coating or exposed steel surface of the bead wire so as to promote and/or retain adhesion between bead wire and rubber, and/or to improve the resistance of bead wire to corrosion. The corrosion inhibiting reagent in the resin coating may amounts between 10％ and 90％ in weight, and preferably between 20％ and 40％ in weight. The resin coating comprising corrosion inhibiting reagent may be coated on the copper alloy coating in an amount corresponding to between 50 and 300 mg/m2, and preferably between 150 and 200 mg/m2. The corrosion inhibiting reagent can be Benzotriazole. The resin can be hydrocarbon resin or phenolic resin, and the hydrocarbon resin can be cumar resin.
Mode(s) for Carrying Out the Invention
A bead wire adapted for the reinforcement of the bead area of a tire can be manufactured as follows.
A wire rod having followingchemical components by mass ％ is chosen as a start material, C:0.80 to 0.85％, Si:0.15 to 0.35％, Mn:0.60 to 0.90％, P:0.025％ or less, S:0.025％ or less, Cr:0.25％ or less,Ni:0.20％ or less, Cu:0.20％ or less, and a balance of Fe and unavoidable impurities. The  wire rod with a diameter of about 5.5mm or 6.5mm is cold drawn in a conventional way to an intermediate diameter and subjected to a well-known patenting treatment.After patenting, the steel wire is further drawn to its final diameter. This deformation determines, together with the steel composition, to a large extent the final tensile strength. The steel wire is subsequently subjected to a stress-relieving treatment, e.g. by annealing the steel wire. The annealing treatment may lower the tensile strength but improves the torsion behaviour. A plating is further applied to the steel wire in order to provide the steel wire with a bronze or brass coating. This plating can done in a chemical and/or an electro-chemical way.
Compared with prior arts, present invention chooses a steel composition with specific scopes. Cis limited between 0.80％ and 0.85％ and Si between 0.15％ and 0.35％. On one hand, both C and Si are elements effective in increasing strength. If the content of C is less than 0.80％, it becomes difficult to stably give a high tensile strength above 2950-440d to the bead wire. Further Si is an element useful as a deoxidizing agent and an element necessary when dealing with steel not containing Al. If the content of Si is less than 0.15％, the deoxidizing effect is too small. On the other hand, C content more than 0.85％ and Si content more than 0.35％ may deteriorate the drawability and ductility of the bead wire. Therefore, C between 0.80％ and 0.85％ and Si between 0.15％ and 0.35％ make a balance between the high tensile strength and the drawability and ductility of the bead wire.
Mn is also an element useful as a deoxidizing agent. Further, Mn is effective in improving hardenability and increasing the strength of steel rod. Further, Mn fixes S in the steel as MnS and prevents hot embrittlement. Last but not least, Mn can replace the other expensive elements, for example, Mo, W, Co, V, and Nb. To achieve above effects, Mn content is no less than 0.60％. If Mn is more than 0.90％, martensite and bainite may form in the wire rod during or after patenting, whereby deteriorate the drawability of the wire rod. Therefore, Mn content between 0.60％ and  0.90％ provides a high-tensile strength bead wire with good ductility and cheap ingredients.
P and S are impurities, and it is preferred to limit the content to be no more than 0.025％ each to secure the ductility of the bead wire.
Besides, other ingredients may be added to further improve the property of the bead wire.
Cr is an element effective in improving the strength of the steel rod and the drawability of the steel rod. The content of Cr can be less than 0.25％, or less than 0.10％, or even without Cr.
Ni is an element that does not contribute much to increase the strength of the bead wire, but increases the toughness. The content of Ni can be less than 0.25％, or less than 0.10％, or even without Ni.
Cu as an effect of increasing the corrosion resistance of the bead wire. The content of Cu can be less than 0.20％, or less than 0.10％, or even without Cu.
In all, the present invention chooses a steel composition with specific scopes to provide a high-strength bead wire with high elongation and simple steel composition.
Below table shows the mechanical features of the bead wires incorporating present invention according to China national standard GBT14450-2008.
Figure PCTCN2014094341-appb-000001
Figure PCTCN2014094341-appb-000002
The bead wire can be further coated with a resin coating comprising a corrosion inhibiting reagent on the copper alloy coating according to prior art CN103991340A to further improve the adhesion between bead wire and rubber and the corrosion-resistance of the bead wire.

Claims (19)

  1. A bead wire adapted for the reinforcement of the bead area of rubber tires, the bead wire having a diameter d ranging from 0.75mm to 2.50mm, having a tensile strength ranging from 2950-440d to 3300-560d MPa, d being expressed in mm, said bead wire comprising following chemical components by mass ％, C:0.80 to 0.85％, Si: 0.15 to 0.35％, Mn: 0.60 to 0.90％, P: 0.025％ or less, S: 0.025％ or less, Cr: 0.25％ or less, Ni: 0.20％ or less, Cu: 0.20％ or less, and a balance of Fe and unavoidable impurities.
  2. A bead wire as claimed in claim 1, wherein the tensile strength of the bead wire ranges from 3040-457d to 3054-436d MPa, d being expressed in mm.
  3. A bead wire as claimed in claim 1, wherein the bead wire having a diameter d ranges from 1.30mm to 2.20mm.
  4. Abead wire as claimed in claim 1, wherein the ratio of Rp0.2/Rm of said bead wire ranges from 90％ to 96％.
  5. A bead wire as claimed in claim 1, wherein the elongation at break of said bead wire ranges from 5.9％ to 7.7％.
  6. A bead wire as claimed in claim 5, wherein the average elongation at break of said bead wire is more than 6.5％.
  7. A bead wire as claimed in claim 1, wherein the number of torsions before fracture of the bead wire ranges from 34 to 41.
  8. A bead wire as claimed in claim 7, wherein the average number of torsions before fracture of the bead wire is more than 36.
  9. A bead wire as claimed in claim 1, wherein said bead wire having a copper alloy coating to promote the adhesion between said bead wire and rubber.
  10. Abead wire as claimed in claim 9, said copper alloy coating is bronze.
  11. A bead wire as claimed in claim 9, said copper alloy coating is brass.
  12. Abead wire as claimed in claim 9, wherein said bead wire is coated with a resin coating comprising a corrosion inhibiting reagent, on the copper alloy coating.
  13. A bead wire as claimed in claim 12, wherein said corrosion inhibiting reagent in said resin coating amounts between 10％ and 90％ in weight.
  14. Abead wire as claimed in claim 13, wherein said corrosion inhibiting reagent in said resin coating amounts between 20％ and 40％ in weight.
  15. A bead wire as claimed in claim 12, wherein said resin coating comprising corrosion inhibiting reagent is coated on the copper alloy coating in an amount corresponding to between 50 and 300 mg/m2.
  16. A bead wire as claimed in claim 15, wherein said resin coating comprising corrosion inhibiting reagent is coated on the copper alloy coating in an amount corresponding to between 150 and 200 mg/m2.
  17. A bead wire as claimed in claim 12, wherein said corrosion inhibiting reagent is Benzotriazole.
  18. A bead wire as claimed in claim 12, wherein said resin is hydrocarbon resin or phenolic resin.
  19. A bead wire as claimed in claim 18, wherein said hydrocarbon resin is cumar resin.
PCT/CN2014/094341 2014-12-19 2014-12-19 High-strength bead wire WO2016095199A1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180319222A1 (en) * 2015-10-28 2018-11-08 Compagnie Generale Des Etablissements Michelin Hybrid bead cores for tires
CN109181456A (en) * 2018-08-13 2019-01-11 山东大业股份有限公司 A kind of new style beads steel wire coating and its coating method
WO2019048091A1 (en) 2017-09-11 2019-03-14 Continental Reifen Deutschland Gmbh Bead core for reinforcing the bead regions of pneumatic vehicle tires
US20210380371A1 (en) * 2018-10-23 2021-12-09 Bekaert Advanced Cords Aalter Nv Steel wire rope, coated steel wire rope and belt comprising steel wire rope
CN116923001A (en) * 2023-07-21 2023-10-24 山东华盛橡胶有限公司 Tire with low rolling resistance and manufacturing method thereof

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JPH10219395A (en) * 1997-01-31 1998-08-18 Sumitomo Electric Ind Ltd High strength bead wire, wire rod for bead wire and their production
CN1989017A (en) * 2005-06-01 2007-06-27 住友电工钢铁电缆株式会社 Annular concentric stranded bead cord and method for producing the same
CN101341036A (en) * 2006-04-05 2009-01-07 住友电工钢铁电线株式会社 Bead cord and vehicle tire
CN101443470A (en) * 2006-04-11 2009-05-27 株式会社普利司通 Bead wire having light weight and excellent drawability, method for production of the bead wire, and lightweight tire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10219395A (en) * 1997-01-31 1998-08-18 Sumitomo Electric Ind Ltd High strength bead wire, wire rod for bead wire and their production
CN1989017A (en) * 2005-06-01 2007-06-27 住友电工钢铁电缆株式会社 Annular concentric stranded bead cord and method for producing the same
CN101341036A (en) * 2006-04-05 2009-01-07 住友电工钢铁电线株式会社 Bead cord and vehicle tire
CN101443470A (en) * 2006-04-11 2009-05-27 株式会社普利司通 Bead wire having light weight and excellent drawability, method for production of the bead wire, and lightweight tire

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180319222A1 (en) * 2015-10-28 2018-11-08 Compagnie Generale Des Etablissements Michelin Hybrid bead cores for tires
WO2019048091A1 (en) 2017-09-11 2019-03-14 Continental Reifen Deutschland Gmbh Bead core for reinforcing the bead regions of pneumatic vehicle tires
DE102017215934A1 (en) 2017-09-11 2019-03-14 Continental Reifen Deutschland Gmbh Bead core for reinforcing the bead areas of vehicle air grips
CN109181456A (en) * 2018-08-13 2019-01-11 山东大业股份有限公司 A kind of new style beads steel wire coating and its coating method
US20210380371A1 (en) * 2018-10-23 2021-12-09 Bekaert Advanced Cords Aalter Nv Steel wire rope, coated steel wire rope and belt comprising steel wire rope
US11993894B2 (en) * 2018-10-23 2024-05-28 Bekaert Advanced Cords Aalter Nv Steel wire rope, coated steel wire rope and belt comprising steel wire rope
CN116923001A (en) * 2023-07-21 2023-10-24 山东华盛橡胶有限公司 Tire with low rolling resistance and manufacturing method thereof
CN116923001B (en) * 2023-07-21 2024-02-06 山东华盛橡胶有限公司 Tire with low rolling resistance and manufacturing method thereof

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