EP3867415A1 - Procédé de traitement thermique de fil d'acier avec appareil associé - Google Patents

Procédé de traitement thermique de fil d'acier avec appareil associé

Info

Publication number
EP3867415A1
EP3867415A1 EP19783063.1A EP19783063A EP3867415A1 EP 3867415 A1 EP3867415 A1 EP 3867415A1 EP 19783063 A EP19783063 A EP 19783063A EP 3867415 A1 EP3867415 A1 EP 3867415A1
Authority
EP
European Patent Office
Prior art keywords
steel wire
velocity
wire
protective gas
heating section
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP19783063.1A
Other languages
German (de)
English (en)
Inventor
Christophe Mesplont
Dennis VANLEENE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Publication of EP3867415A1 publication Critical patent/EP3867415A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method for thermal treatment of steel wire and an associated apparatus to execute such method.
  • the thermal treatment of steel wire is used to change the properties of the steel.
  • Particular steel wires where the use of a thermal treatment is required are for example the stress relieving of bead wire (for coiling beads as used in a tire), the annealing of far drawn low carbon wire before further drawing or the tempering of martensitic wire (high carbon) e.g. for use as spring wire.
  • a steel wire that is a bronze or brass coated steel wire - must show a minimum degree of elongation-at-break (2% or more) to be safely mountable in the bead of a tire.
  • a spring wire must be thermally treated in order to control the yield point of the wire that has an impact on the spring properties.
  • tempering Another example of a thermal treatment is tempering. During tempering of martensitic quenched wire, carbon will diffuse out of heavily stressed martensite and precipitate in the form of carbides, resulting in a more ductile yet strong microstructure that can be coiled for example as a spring.
  • thermal treatment of steel wires has been done by heating the steel wire in a molten lead bath.
  • the temperature of the molten lead can be easily controlled while the heat transfer from lead to wire is optimal resulting in immediate and stable temperatures i.e. isothermal heating.
  • the molten lead also insulates the steel wire surface from oxidation. The only oxidation that can occur is at the exit of the lead bath but this is countered by covering the molten lead with anthracite releasing coal gas that is burned thereby consuming the oxygen in the vicinity of the steel wire surface.
  • a soaking zone i.e. a long, flat box wherein the wire is insulated from its environment.
  • the treatment is not as isothermal as when using a lead bath the temperature can be kept sufficiently stable.
  • a protective atmosphere which can be done by injecting a protective gas into the heating coil.
  • WO 2014/142355 describes a wire heating system and a wire heating method comprising one or more induction coils followed by a soaking zone. According the system and method the heating of the wire rod is controlled by adjusting the feed current to the induction coils based on the entry wire speed and diameter. In this way the overheating of the wire is prevented even when the speed of the line is reduced for example for a changeover.
  • CN 107227400A describes an induction heating apparatus wherein the individual steel wires pass through individual coils of which the power can be individually controlled. This allows to process different wire diameters concurrently on the same line.
  • a primary objective of the inventors was therefore to reduce the cost and the environmental impact of the thermal treatment of steel wire. More specifically the inventors succeeded in a greatly reducing the use of protective gas without increasing the need for additional pickling. The inventors have found a method to control the formation of an oxide scale.
  • the inventors have succeeded in completely eliminating the use of a protective gas at least during the period wherein the line is running at its operative speed.
  • a method for thermal treatment of a steel wire according the steps of claim 1 includes the steps of:
  • the heating section comprises one or more induction coils that are placed in series.
  • in series is meant that when following a single wire it runs through the coils one after the other. Different wires may run side by side through one or more coils in series. Alternatively, for each wire there may be a single series of one or more coils only containing one wire with the coils being arranged side by side.
  • the induction coils are powered at a constant power, making the driving electronics simple and reliable and resulting in a stable and equal heat treatment of all wires.
  • the wire is cooled to ambient temperature for example by letting it cool in ambient air, or in a coolant such as water or oil or a combination thereof.
  • a protective gas is injected in the heating section at a flow rate that depends on the wire velocity, more specifically in that the flow rate is decreased with increasing velocity of the steel wire or in that the flow rate is increased with decreasing velocity.
  • the invention is equally well useable for the tempering of martensitic high carbon steel wire.
  • Martensitic high carbon steel wire is obtained by rapidly cooling a wire after it has been brought to the austenizing temperature of 930 to 1000°C. Tempering takes place at 360 to 550°C and helps the diffusion of some carbon out of the martensitic lattice thereby forming iron carbide precipitates. By tempering some ductility is restored to the otherwise brittle martensitic steel wire.
  • the flow of protective gas is decreased with increasing velocity of the steel wire or the flow of protective gas is increased with decreasing velocity of the steel wire in a continuous or stepwise manner.
  • the decrease of flow rate can be continuous with increasing wire velocity.
  • the increase of flow rate can be continuous with decreasing wire velocity.
  • Examples of continuous dependencies are a gas flow that is inversely proportional to the wire velocity or a gas flow that linearly decreases with increasing wire velocity i.e. the relation between gas flow and wire velocity has a constant negative slope in the transition region.
  • the decrease in flow rate can be stepwise such as for
  • the gas flow is kept at a high level and when the velocity enters a higher, second range then as long as the wire has a velocity in that range the protective gas flow is reduced to a lower level compared to the high level.
  • the increase in gas flow can be stepwise when the velocity enters the lower, first range of wire velocity.
  • the power, delivered to the one or more induction coils is kept constant with changing wire velocity.
  • step (b) the wire is immediately guided through a‘soaking zone’ referred to as step (b’).
  • a soaking zone comprises a thermally insulating enclosure wherein the wire is allowed to cool down in a controlled way, more specifically at a slow rate.
  • the diffusion phenomena in the steel continue without the need of adding additional heat.
  • the protective gas must also be injected in the soaking zone.
  • the wire is coated with a metallic coating which comprises a metal or metal alloy selected from the group comprising copper, zinc, tin, bronze, brass or any combination thereof a step that is called (c’) hereinafter.
  • the application of the metallic coating can be done in several ways such as for example:
  • a protective gas flow is injected into the heating section. This gas flow is decreased i.e. there is a reduced injection of protective gas flow when the velocity is increased to the operative velocity. As the operative period is much longer than the changeover period there is a reduced gas flow for an extended period of time. This results in a large saving of protective gas usage during a prolonged time.
  • the cross sectional area of the heating section is the volume of the heating section divided by the length of the heating section.
  • the volume of the heating section is the volume surrounding the wire in the heating section from the entry into the heating section to the exit of the heating section. For clarity: if a soaking section is present, the volume of the soaking section must be taken into account.
  • the product of the cross sectional area and the difference between the operative velocity and the reduced velocity hereinafter the‘Product’
  • the inventors were able to keep the gas flow below ten times the Product and conjecture that is possible to reduce this further to below eight times or even below five times the Product. If the cross sectional area of the heating section is further reduced by for example introducing ceramic tubing into the coils, the minimum flow amount to prevent oxidation will be further reduced.
  • An alternative method to calculate the protective gas flow when the wire is running at the reduced wire velocity is to specify the refreshment rate in the volume taken by the heating section.
  • the gas flow into the heating section is larger than 1 to 6 times the volume of the heating section per minute, there will be a complete refresh in protective gas every minute or every ten seconds in the complete volume.
  • the inventors reduced the gas flow to zero when the wire was running at the operative velocity. This presents the ultimate savings in protective gas as then there is no spillage of gas while still delivering a steel wire with the correct oxides.
  • the volume of the heating section is purged with protective gas at the commencement of a changeover period.
  • purging is meant a short blow of gas of at least one to ten times the volume of the heating section to quickly and completely remove all possible oxygen remaining in the heating section.
  • a protective gas an inert gas such as argon or nitrogen can be used.
  • protective gases are reducing gasses such as hydrogen or carbon monoxide although the latter is generally not considered due to its toxicity.
  • mixtures of gasses such as a mixture of nitrogen and hydrogen (e.g. resulting from the cracking of ammoniac) can be used.
  • the inventors have found that providing a mixture of reducing gas and inert gas as a protective gas makes it possible to tune to the desired oxide scale formation on the steel wire. Indeed for certain wire applications a controlled presence of certain oxides is desirable. In this respect even an oxidizing gas such as air or pure oxygen can be injected together with an inert gas under controlled circumstances.
  • an apparatus installation for the thermal treatment of steel wire.
  • the apparatus comprises a heating section with one or more induction coils, a take-up section with an adjustable velocity for pulling said steel wire through said heating section.
  • the apparatus is further provided with a controllable supply of gas for injecting protective gas into the heating section.
  • Special about the apparatus is that the flow rate of said supply of protective gas is dependent on said adjustable velocity in that the flow rate of the supply of the protective gas decreases when the velocity of the steel wire increases and/or wherein the supply of protective gas increases when the velocity of the steel wire decreases.
  • the heating section also
  • the wire uninterruptedly goes from the induction coils to the soaking section.
  • protective gas with the velocity of the steel wire is such that the supply of protective gas decreases stepwise when the velocity of the steel wire increases. Mutatis mutandis the flow of gas increases stepwise when the velocity of the steel wire decreases..
  • the relation between wire velocity and flow of protective gas can be continuous for example inversely proportional to the wire speed or linearly proportional with a negative slope.
  • Combinations of stepwise rise in protective gas flow when entering a lower velocity range with a continuous increase in protective gas flow when the wire velocity is reduced are of course also possible, likewise the combination of a continuous increase in flow rate when lowering the speed and a stepwise reduction of gas flow when the wire speed is increased are equally well preferred.
  • the power delivered to the induction coils can or is kept constant at a fixed level independent of the wire velocity.
  • the apparatus is free of any feedback loop between wire velocity and power delivered to the induction coils.
  • the apparatus will work at an operative
  • the operative speed is related to the diameter of the steel wire to be annealed. At the operative speed the flow rate of protective gas is low or zero. When the velocity of the wire is reduced the flow rate of the supply of protective gas is reduced by between 1 and 10 times the product of the cross sectional area of said heating section times the difference between the operative velocity and the actual wire velocity.
  • the apparatus is provided with a gas premix unit.
  • a reducing gas is mixed with an inert gas in pre-set ratios prior to being injected as a protective gas in the heating section.
  • the gas premix unit can be used to mix an oxidising gas with an inert gas.
  • An oxidising gas is for example oxygen or air. The premix unit allows to tune the composition and amount of the oxides that form on the steel wire.
  • FIGURE 1 shows a schematic representation of a wire processing line comprising the thermal treatment apparatus according the invention
  • FIGURE 2 shows different operating schemes for the method for thermal treatment of steel wires.
  • FIGURE 3 shows a block diagram illustrating the method and some alternatives comprised in the method.
  • FIGURE 1 shows a schematic representation of a bead wire line wherein the apparatus according the invention is included and operated. Note that some steps and baths such as drying steps and water rinsing are omitted from the drawing as these are known to the skilled person and would only complicate the schematic.
  • Pay-off spool 102 delivers steel wire 140 for example a cold drawn, high carbon steel wire with a diameter between 0.70 and 3.00 mm e.g. 0.89 mm, 0.96 mm, 1.30 mm, 1.60 mm, or 1.83 mm.
  • the terms ‘after’ and‘before’ are relative to the pay-off direction of the wire. Due to the cold drawing the tensile strength of the wire is about 1700 to 2700 N/mm 2 depending on diameter and required tensile strength level.
  • NT 0.89 Normal Tensile
  • FIT 0.89 High Tensile
  • the wire 140 is first cleaned in cleaning section 106 to remove any surface residuals.
  • the wire is guided through a heating section 111 where the temperature is raised to 480°C.
  • the heating section 111 consists of two induction coils 108, 108’, sequentially organised.
  • the induction coils are fed with mid-frequent power source 112.
  • a soaking zone 110 is provided that keeps the wire hot until it leaves the heating section 111.
  • the soaking section is a thermally insulated chamber.
  • the exit temperature is about 400°C.
  • the volume of the heating section is the free space inside the heating section wherein the wire travels. It is equal to the average cross section times the length of the heating section.
  • the volume of the heating section is filled with a protective gas - in this case nitrogen - from a central tank 114 through a manifold of feed lines 130 in order to prevent oxidation of the wire surface.
  • the Fe(lll) oxides are difficult to remove by an acid bath 116.
  • a protective gas When using a protective gas, the formation of oxides and in particular Fe(lll) oxides is prevented. When no protective gas is used oxides will grow making the removal of the oxides much more difficult.
  • the protective gas is a mixture of a reducing gas (e.g. hydrogen) with an inert gas (e.g. nitrogen)
  • a reducing gas e.g. hydrogen
  • an inert gas e.g. nitrogen
  • the wire After removal of the oxides the wire is lead through a plating section 118, comprising e.g. copper sulphate with tin dissolved. By chemical exchange a bronze coating is deposited on the steel wire 140’ resulting in bead wire 140”. After drying in a dry oven an optional green adhesion enhancer may be applied on the steel wire in applicator 120 prior to take up on the take- up spool 104.
  • a plating section 118 comprising e.g. copper sulphate with tin dissolved.
  • a bronze coating is deposited on the steel wire 140’ resulting in bead wire 140”.
  • an optional green adhesion enhancer may be applied on the steel wire in applicator 120 prior to take up on the take- up spool 104.
  • the exchange reaction in the plating bath 118 is inhibited resulting in not properly coated bead wire with concomitant lack of adhesion or leading to differences in appearance.
  • a protective gas prevents the formation of hard to remove oxides on the wire. It was therefore a surprise to the inventors that the use of a protective gas can be reduced or even stopped when the line is running at its operative speed.
  • the operative speed is that speed at which the wire upon exiting of the heating section has the desired mechanical properties. It varies with the diameter of the wire and is between 100 and 600 meter per minute. Only when the speed of the line is reduced below the operative speed, an increased use of a protective gas becomes necessary.
  • a reduction in wire speed is needed for example at the run-out of a pay-off spool or at the changeover of a take up spool.
  • the reduced wire speed is one tenth of the operative speed in order to allow operators to exchange spools in a safe way while guaranteeing the product quality throughout the complete spool.
  • a control system is added to the installation with a velocity sensor 126 that controls a throttle valve 124 through controller 128.
  • the wire velocity is reduced e.g. in case of spool runout or change in take-up spool the gas flow is increased.
  • the wire velocity nears the operative velocity the gas flow supply is decreased or even set to nil.
  • FIGURE 2 - Different strategies - as illustrated in FIGURE 2 - may exist for coupling the gas flow of the protective gas to the wire velocity (also called‘line speed).
  • the gas flow‘F’ (expressed in normal litres of gas per minute) is inversely proportional to the wire velocity‘V’ (in meter per minute): wherein ⁇ P red is the gas flow at the reduced wire velocity V red .
  • the gas flow at reduced wire velocity is set to:
  • V op is the operational velocity and‘F or ’ is a small‘maintenance’ flow of protective gas maintained during the operative period.
  • C is again a value of between 0.1 and 0.5 when the velocity is expressed in meter per minute, the cross sectional area in centimetre square and the gas flow in litres per minute.
  • the protective gas flow is maintained at a high level‘O red ’ in a speed range from‘V red ’ to some higher speed e.g. 10% above V red or‘V red + D’. Once the wire velocity is higher than the latter speed the gas flow is completely switched off.
  • FIGURE 3 illustrates the different alternative paths in the method that can be followed to anneal a steel wire.
  • V 300 After unwinding of the steel wire at a wire velocity‘V 300, the wire is heated 305 by guided through a heating section.
  • the heating section either consists out of one or more induction coils 302 (path A) or consists out of one or more induction coils 302 followed by a soaking zone 304 (path B).
  • path A consists out of one or more induction coils 302
  • path B consists out of one or more induction coils 302 followed by a soaking zone 304
  • the annealed wire can be directly spooled on a carrier (path D) in a winding step 314 or can be coated with bronze coating consisting of copper and tin (path C) in an electrolytic bath 308 or can be hot dip galvanised (path E) by immersion in a molten zinc bath 310 prior to be being wound on a carrier 314.
  • path D a carrier
  • path C copper and tin
  • path E hot dip galvanised

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Un procédé de traitement thermique d'un fil d'acier comprend les étapes connues consistant à dérouler un fil d'acier à une vitesse de fil, guider le fil d'acier dans une section de chauffage comprenant une ou plusieurs bobines d'induction, refroidir et enrouler le fil d'acier sur un support. Ce procédé est spécifique par le fait qu'un gaz protecteur est injecté dans la section de chauffage à un débit qui dépend de la vitesse du fil. Les inventeurs ont découvert que le débit du gaz protecteur diminuerait avec l'augmentation de la vitesse. Dans la limite, aucun gaz protecteur n'est injecté dans la section de chauffage lorsque la ligne est en marche à la vitesse de fonctionnement. Il en résulte une utilisation réduite de gaz protecteur. Lorsque des bobines d'enroulement ou de déroulement doivent être échangées et que la ligne doit fonctionner à une vitesse inférieure, le débit du gaz protecteur est augmenté. L'invention permet de contrôler le type et le taux d'oxydes formés sur le fil. L'invention concerne également un appareil mettant en oeuvre le procédé, le flux du gaz protecteur étant rendu dépendant de la vitesse du fil par l'intermédiaire d'un système de commande.
EP19783063.1A 2018-10-16 2019-10-10 Procédé de traitement thermique de fil d'acier avec appareil associé Pending EP3867415A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18200696 2018-10-16
PCT/EP2019/077505 WO2020078829A1 (fr) 2018-10-16 2019-10-10 Procédé de traitement thermique de fil d'acier avec appareil associé

Publications (1)

Publication Number Publication Date
EP3867415A1 true EP3867415A1 (fr) 2021-08-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19783063.1A Pending EP3867415A1 (fr) 2018-10-16 2019-10-10 Procédé de traitement thermique de fil d'acier avec appareil associé

Country Status (6)

Country Link
EP (1) EP3867415A1 (fr)
KR (1) KR20210076909A (fr)
CN (1) CN112840043B (fr)
BR (1) BR112021005116A2 (fr)
EA (1) EA202191049A1 (fr)
WO (1) WO2020078829A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021201104A1 (de) * 2021-02-05 2022-08-11 Maschinenfabrik Niehoff Gmbh & Co Kg Drahtdurchlaufglühe

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EA202191049A1 (ru) 2021-07-09
CN112840043A (zh) 2021-05-25
CN112840043B (zh) 2023-05-16
KR20210076909A (ko) 2021-06-24
BR112021005116A2 (pt) 2021-06-15

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