EP3132062A1 - Procédé et dispositif de fabrication d'un feuillard d'acier - Google Patents

Procédé et dispositif de fabrication d'un feuillard d'acier

Info

Publication number
EP3132062A1
EP3132062A1 EP15716060.7A EP15716060A EP3132062A1 EP 3132062 A1 EP3132062 A1 EP 3132062A1 EP 15716060 A EP15716060 A EP 15716060A EP 3132062 A1 EP3132062 A1 EP 3132062A1
Authority
EP
European Patent Office
Prior art keywords
steel
strip
temperature
strip steel
nozzles
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.)
Withdrawn
Application number
EP15716060.7A
Other languages
German (de)
English (en)
Inventor
Leander Ahorner
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.)
Voestalpine Precision Strip GmbH
Original Assignee
Voestalpine Precision Strip GmbH
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 Voestalpine Precision Strip GmbH filed Critical Voestalpine Precision Strip GmbH
Publication of EP3132062A1 publication Critical patent/EP3132062A1/fr
Withdrawn legal-status Critical Current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
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous 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
    • C21D1/62—Quenching devices
    • 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • 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
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces
    • F27D2009/0005—Cooling of furnaces the cooling medium being a gas
    • F27D2009/0008—Ways to inject gases against surfaces

Definitions

  • the present invention relates to a method and an apparatus for producing a strip steel, in particular a strip steel with bainitic microstructure, such as a spring steel strip or a punching tool.
  • Such spring band or punching tools are usually prepared from a hot rolled and pickled carbonaceous steel strip, which is typically first cold rolled to the desired thickness and then subjected to various treatment steps to the
  • the original wide strip steel is longitudinally divided and finalized in the desired dimensions in individual strips.
  • a particularly preferred microstructure for carbon steels is the so-called bainite microstructure, which can be produced during the heat treatment of carbon steel by isothermal conversion as well as by continuous cooling. For as complete as possible
  • German patent application DE 10 2005 054 014 A discloses a process for producing a strip steel having a bainitic structure in a continuous process, in which the starting material is heated at a temperature above the
  • Austenitizing austenitizing temperature the starting material then in a Metal bath to a temperature lower than the Austenitmaschinestemperatur deters and keeps in a hot air oven heated to the conversion temperature for bainite. After the holding phase, the steel strip is cooled to ambient temperature.
  • a typical metal bath that can be used to quench the strip steel located above the austenitizing temperature is a lead / bismuth melt.
  • Microstructure are generated. One is the one in Brugnera
  • Chromium steels are made with a two-stage quench and one with it
  • Slit nozzles therefore creates a transverse to the strip running direction cooling front (the band edges are cooler than the band center).
  • an inhomogeneous temperature distribution in the band can negatively affect the
  • Microstructure transformation or structural constituents and their volumetric composition impact. Since the strength or material properties, e.g. Toughness of the resulting bainite microstructure depends on the transformation temperature, leading a temperature difference between mid-band and the
  • the present invention is therefore based on the technical problem of a method and an apparatus for producing a steel strip, in particular a strip steel with bainitic microstructure, such as a
  • Indicate quenching process which is absolutely free of metal bath residues, in particular free of heavy metal residues such as lead or bismuth and which a high flatness of the tape and a homogeneous as possible
  • Device according to the invention are objects of the dependent
  • the invention accordingly relates to a method for producing a strip steel, wherein the strip steel is continuously subjected to the following treatment steps: austenitizing the strip steel at a first temperature above the austenitizing temperature and quenching the strip steel by means of a gaseous quenching agent to a lower second temperature corresponding to a desired steel structure is selected.
  • the inventive method is characterized in that the gaseous quenching agent is passed over the strip steel, that over the width of the strip steel, a uniform cooling is achieved.
  • strip steel for example, a hot-rolled, optionally pickled strip steel can be used, which is cold-rolled to the desired thickness before the heat treatment, in particular the remuneration with the inventive method.
  • a typical starting material is a strip steel with a width of 250 to 1250 millimeters and a thickness of 2 to 4 millimeters, the
  • the austenitizing of the strip steel occurs at a first temperature above the austenitizing temperature, which depends on the composition of the strip steel. Typically, this first temperature is in the range of 900 ° C or above.
  • Transport speed of the steel strip are chosen so that the
  • Austenitizing furnace is located. After austenitizing, the steel strip becomes very fast, i. H. in seconds, quenched to a lower, second temperature.
  • the second temperature and cooling rate are usually related to the desired microstructure. For example, if a strip steel having a bainitic microstructure is desired, the strip steel is quenched to a lower, second temperature, which in the
  • Bainitization area, d. H. the temperature at which a bainite structure can form in the strip steel is below the austenitizing temperature and above the martensite starting temperature of the strip steel material. Typically this is
  • the strip steel is heated to a temperature of several minutes, typically 2 to 3 minutes
  • the gaseous quenching agent is preferably carried in a temperature-controlled circuit. This ensures, on the one hand, that the least possible loss of gaseous quenching agent occurs, so that
  • the temperature control ensures that the gas can be blown onto the continuous strip steel at an adjustable, constant temperature.
  • a jet fan is preferably used with a plurality of nozzles, which preferably the strip steel both from the top and
  • the individual nozzles of the jet fan are adjustable in their orientation and / or in their flow.
  • the temperature of the steel strip after the quenching unit can be monitored with suitable sensors and the jet fan can be adjusted accordingly.
  • the flow rate of the gaseous quenching agent is varied across the width of the steel strip, i. ie transverse to the direction of tape travel.
  • the flow rate of the quenching agent is preferably varied in such a way that the cooling capacity towards the strip edges is lower than in the middle of the strip, so that ultimately a temperature profile which is constant over the strip width is achieved. This ensures that a uniform, for example bainitic, microstructure with constant hardness or strength develops throughout the entire strip.
  • the cooling is thus achieved transversely to the strip running direction by adjusting or even by controlling the flow width of the slot dies, for example by lateral closing or covering part of the openings of the nozzle. Especially in the first cooling area can thereby the temperature field over the
  • the process according to the invention can be used for a wide variety of hardenable and non-hardenable steels.
  • the method is particularly preferably used for curing hardenable carbon steels, in particular for
  • the lower, second temperature is selected such that it lies in the bainitization region of the steel strip, and after cooling, the steel strip is held at this second temperature for the quasi-isothermal formation of a bainite microstructure.
  • a hydrogen-containing gas mixture for example a mixture of hydrogen and nitrogen.
  • the hydrogen content of the gas mixture used as quenching agent is preferably between 50 vol.% And 100 vol.%. Hydrogen is particularly preferred because of its high thermal conductivity, or more precisely because of the resulting high heat transfer coefficient as a coolant.
  • flowing fluid is defined as the ratio of thermal conductivity and thickness of the thermal boundary layer of the fluid at the surface.
  • Heat transfer coefficient with a hydrogen content of about 85 vol.% Heat transfer coefficient with a hydrogen content of about 85 vol.%.
  • gases with suitably high thermal conductivity may be used in addition to or as an alternative to hydrogen. Due to the leadership of the Quenching agent in the circuit, the loss of hydrogen in the cooling circuit is low and is optionally replaced continuously.
  • the strip steel can be surface-decarburized in a moist, hydrogen-containing nitrogen atmosphere prior to austenitizing in an upstream furnace or even during austenitizing in the same furnace.
  • the surface decarburization typically takes place in a comparable temperature range as the austenitization, so that both processes can be carried out in the same furnace.
  • this is a gas mixture of hydrogen, nitrogen and
  • Water vapor used for example, an atmosphere of 15 wt.%
  • Austenitizing oven is heated to a temperature of usually more than 900 ° C, crack on the steel strip typically still existing surface contaminants, such as oil residues from the previous processing steps. So that these residues do not burn on the strip surface, the moist, hydrogen-containing nitrogen atmosphere is preferably conducted in countercurrent to the transport direction of the ribbon jet, so that the
  • the strip steel can be cooled to room temperature and further processed, for example by dividing the steel strip by slitting into individual lines of smaller width, which then form, for example, the later cutting lines.
  • the later cutting lines For this purpose, after longitudinal cutting, at least one edge of the resulting lines, which later forms the cutting edge of the cutting lines, can harden.
  • the steel strip is particularly preferred immediately after the process according to the invention, for example after formation of the bainite structure, at a higher temperature, so for example at a temperature above the bainitization range, tempered to the desired final strength. Tempering can be carried out, for example, at a temperature between 300 ° C and 600 ° C, typically at a temperature of 400 ° C in a hydrogen-containing
  • the tempering is typically done in one
  • a strip steel which consists of a steel with a carbon content of between 0.2 and 1.25% by weight.
  • steels include, for example, martensitic hardenable chromium steels or martensitic hardenable carbon steels.
  • a carbonaceous steel strip having a carbon content of between 0.3 and 0.8% by weight is preferably used.
  • the invention also relates to a device for producing a steel strip, in particular for carrying out the method according to the invention, which comprises an austenitizing unit for heating a continuous strip steel to a first temperature above the austenitizing temperature and a
  • Quenching unit for quenching the continuous strip steel to a lower, second temperature, which is selected according to a desired steel structure, wherein the quenching unit has a supply means for supplying a tempered gaseous quenching agent to the continuous strip steel.
  • the device according to the invention is characterized in that the supply device is set up so that a uniform cooling is achieved over the width of the strip steel.
  • the supply device comprises a plurality of nozzles arranged above and below the continuous strip steel with which the tempered gaseous quenching agent can be blown onto the strip steel.
  • the nozzles are designed so that a varying over the width of the ribbon jet flow of the gaseous
  • Quenching agent is generated. This allows the cooling rate to be adjusted locally so that edge effects during cooling are compensated for and a temperature that is constant over the bandwidth is reached.
  • the nozzles may be formed as slit nozzles, wherein at least some of the nozzles are arranged obliquely to the continuous strip steel.
  • the slot nozzles may be formed as slit nozzles, wherein at least some of the nozzles are arranged obliquely to the continuous strip steel.
  • formed nozzles have openings with adjustable apertures, so that the width of the nozzles, from which the gaseous quenching agent on the
  • the apertures are adjusted so that initially only the central region of the incoming strip is cooled, while in the following slot nozzles increasingly the edges are also cooled.
  • Perlite excretion is achieved, on the other hand, the martensite start temperature is not exceeded. If the final temperature of the strip is used as the controlled variable there is a risk that the cooling rate will be changed at the same time and a critical value for a non-judicial quenching will be undercut.
  • the cooling rate can be maintained at a high level, with the final temperature in this stage being well above the level
  • Martensite start temperature is.
  • the target temperature for the isothermal can be achieved by a milder or tempered gas stream
  • the quenching unit preferably further comprises a cycle for the gaseous quenching agent and, optionally, a supply line via which a loss of gaseous quenching agent in the circulation from a storage container
  • the quenching unit also comprises suitable means, for example heat exchangers, for the temperature of the gaseous
  • Fig. 1 is a schematic representation of a device according to the invention for
  • FIG. 2 shows a slot nozzle arrangement according to the prior art in which a noticeable edge effect occurs
  • FIG. 3 shows a variant of the slot nozzle arrangement according to the invention with partially slanted slot nozzles
  • Fig. 4 shows a further arrangement of the slot nozzles according to the invention, in which the
  • a strip steel 10 is shown, which is guided over a gap 1 1 in a furnace 12 for austenitizing and optionally also for surface decarburization of the strip steel.
  • the transport direction of the steel strip is indicated by the arrows 13 and 14.
  • the strip steel 10 is heated to a temperature of approx.
  • the austenitizing / surface decarburization furnace has a dry or humid atmosphere besides nitrogen
  • the atmosphere is over in In the vicinity of the lock 15 located inlet port 16 is blown into the furnace and the furnace 12 via an outlet opening 17, which is located in the vicinity of
  • Entrance slit 1 1 is, leave again. Thereby, as indicated by the arrows 18, the atmosphere is conducted in countercurrent to the continuous belt 10, so that cracked contaminants can be discharged with the gas stream.
  • the austenitizing furnace 12 is adjoined by a quenching unit 19, which is separated from the austenitizing furnace by the lock 15.
  • Quenching unit 19 a gaseous quenching agent (for example, a hydrogen / nitrogen gas mixture) in a tempered circuit 20 is performed.
  • the circuit 20 comprises for this purpose a cooling device 21, in order to keep the circulating gas at a constant temperature, which ensures that in the
  • the quenching unit 19 a plurality of nozzles 22, 23, which are arranged above or below the strip steel and blow the gaseous quenching agent on the surface of the continuous strip steel. Via a feed 24, fresh gas can be supplied to the circuit 20 in order to compensate losses in the circuit, in particular losses via the lock 15 and further via the outlet opening 17.
  • the quenching unit 19 is followed by a holding unit 25, in which the
  • continuous strip steel is kept at a temperature in the bainitization region, for example at a temperature of 400 ° C., so that a bainite structure can be formed in the strip steel.
  • the atmosphere in the holding furnace 25 is made
  • the holding furnace 25 also has suitable tempering means (not shown in FIG. 1) which, because of the convection prevailing in the furnace (shown schematically by the arrows 26), ensure that the formation of the bainite structure can be quasi-isothermal.
  • the steel strip leaves the bainite structure according to the invention
  • FIG. 2 shows a strip steel 10 in the region of a quenching unit 19 according to the prior art in plan view.
  • the transport direction of the strip steel 10 (strip running direction) is again symbolized by an arrow 13.
  • a plurality of slot nozzles 22 are arranged transversely to the strip running direction for cooling the strip steel 10. From these slit nozzles 22, the cooling gas flows on the strip steel 10.
  • the dashed lines 30a-30g symbolize the
  • Temperature curve of the strip steel 10 based on isotherms with 30a-30g decreasing temperature.
  • the course of the isotherms shows the edge effect associated with the prior art, whereby lower temperatures at the edge are achieved much earlier at the edge than at the center of the steel strip due to the greater cooling of the edges of the steel strip.
  • the invention proposes to vary the flow of the gaseous quenching agent across the width of the strip steel.
  • slot nozzles 22a, 22b, 22c, 22d are used with increasing width in the strip running direction 13, so that initially only the central area of the strip steel 10 is cooled and only at the end of the strip
  • Quenching unit 19 also the edge areas. In order to further homogenize the temperature distribution, can be arranged obliquely to the strip running direction 13
  • Quenching are arranged as in the prior art arranged transversely to the strip running direction 13 slot nozzles 22, but according to the invention with
  • Apertures 31 are provided, which can be adjusted so that in turn only the central portion of the strip steel 10 is cooled again, while the edge regions are cooled only at the end of the quenching unit 19.
  • the panels as symbolized by the arrows 32, are designed to be movable, so that the respective opening can be adapted to different steel types, strip dimensions or cooling profiles.
  • reference numerals 30a-30g again show isotherms of decreasing temperature. Due to the special arrangement or

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

L'invention concerne un procédé et un dispositif de fabrication d'un feuillard d'acier, en particulier d'un feuillard d'acier à structure baïnitique, par exemple un feuillard d'acier destiné à fabriquer des ressorts ou un outil de poinçonnage. Le feuillard d'acier est soumis en continu aux étapes de traitement suivantes : austénitisation du feuillard d'acier à une première température supérieure à la température d'austénitisation ; trempe du feuillard d'acier au moyen d'un milieu de trempe gazeux à une seconde température plus basse qui est choisie en fonction d'une structure souhaitée de l'acier. Selon l'invention, le milieu de trempe gazeux est amené sur le feuillard d'acier de manière à obtenir un refroidissement uniforme sur la largeur du feuillard d'acier.
EP15716060.7A 2014-04-15 2015-04-15 Procédé et dispositif de fabrication d'un feuillard d'acier Withdrawn EP3132062A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14164750.3A EP2933342A1 (fr) 2014-04-15 2014-04-15 Procédé et dispositif de fabrication d'une feuille d'acier avec une structure bainitique
PCT/EP2015/058213 WO2015158795A1 (fr) 2014-04-15 2015-04-15 Procédé et dispositif de fabrication d'un feuillard d'acier

Publications (1)

Publication Number Publication Date
EP3132062A1 true EP3132062A1 (fr) 2017-02-22

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP14164750.3A Withdrawn EP2933342A1 (fr) 2014-04-15 2014-04-15 Procédé et dispositif de fabrication d'une feuille d'acier avec une structure bainitique
EP15716060.7A Withdrawn EP3132062A1 (fr) 2014-04-15 2015-04-15 Procédé et dispositif de fabrication d'un feuillard d'acier

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14164750.3A Withdrawn EP2933342A1 (fr) 2014-04-15 2014-04-15 Procédé et dispositif de fabrication d'une feuille d'acier avec une structure bainitique

Country Status (7)

Country Link
US (1) US20170044643A1 (fr)
EP (2) EP2933342A1 (fr)
JP (1) JP2017514996A (fr)
KR (1) KR20170012224A (fr)
CN (1) CN106460081A (fr)
BR (1) BR112016023820A2 (fr)
WO (1) WO2015158795A1 (fr)

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CN110172555B (zh) * 2019-06-27 2020-12-25 上海交通大学 一种改善钢的表层抗氢脆性能的脱碳工艺
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CN113046545B (zh) * 2021-03-11 2024-01-30 新余钢铁股份有限公司 窄钢带热处理工艺
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BR112016023820A2 (pt) 2017-08-15
WO2015158795A1 (fr) 2015-10-22
CN106460081A (zh) 2017-02-22
JP2017514996A (ja) 2017-06-08
KR20170012224A (ko) 2017-02-02
EP2933342A1 (fr) 2015-10-21
US20170044643A1 (en) 2017-02-16

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