EP2818571A1 - Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier - Google Patents

Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier Download PDF

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Publication number
EP2818571A1
EP2818571A1 EP13173619.1A EP13173619A EP2818571A1 EP 2818571 A1 EP2818571 A1 EP 2818571A1 EP 13173619 A EP13173619 A EP 13173619A EP 2818571 A1 EP2818571 A1 EP 2818571A1
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EP
European Patent Office
Prior art keywords
steel sheet
furnace
web
sheet web
steel
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.)
Granted
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EP13173619.1A
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German (de)
English (en)
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EP2818571B1 (fr
Inventor
Rolf-Josef Schwartz
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Schwartz GmbH
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Individual
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Publication date
Priority to EP13173619.1A priority Critical patent/EP2818571B1/fr
Application filed by Individual filed Critical Individual
Priority to MX2015017681A priority patent/MX2015017681A/es
Priority to JP2016520523A priority patent/JP6583638B2/ja
Priority to BR112015032358-8A priority patent/BR112015032358B1/pt
Priority to CA2915440A priority patent/CA2915440A1/fr
Priority to CN201480034321.1A priority patent/CN105518177A/zh
Priority to KR1020167001874A priority patent/KR20160058746A/ko
Priority to EP14733592.1A priority patent/EP3013994B1/fr
Priority to US14/896,965 priority patent/US20160145733A1/en
Priority to PCT/EP2014/063150 priority patent/WO2014206933A1/fr
Publication of EP2818571A1 publication Critical patent/EP2818571A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • 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
    • C21D9/63—Continuous furnaces for strip or wire the strip being supported by a cushion of gas
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/02—Pretreatment of the material to be coated
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation
    • C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/60—After-treatment
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/20—Arrangements of devices for charging
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas
    • 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
    • F27B9/38—Arrangements of devices for charging
    • 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
    • F27B9/39—Arrangements of devices for discharging
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0024—Charging; Discharging; Manipulation of charge of metallic workpieces
    • 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
    • C21D1/673—Quenching devices for die 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/008—Martensite
    • 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
    • C21D2211/009—Pearlite
    • 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
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0075—Charging or discharging vertically, e.g. through a bottom opening

Definitions

  • the invention relates to an apparatus and a method for diffusing aluminum-silicon (Al-Si) into a surface of an Al-Si-coated steel sheet, in which a high-melting aluminum-silicon-iron alloy is formed by the indiffusion.
  • furnaces for heat treatment have prevailed.
  • the metal parts to be treated are continuously conveyed through the oven.
  • chamber furnaces can also be used in which the metal parts are batchwise placed in a chamber, heated there and then removed again.
  • a board is punched out of a steel strip, cold formed and fed the preformed component of the heat treatment. After the heat treatment, the hot component is press fed into the press in an indirectly cooled tool. Subsequently, the components are trimmed again and sandblasted to remove any existing scaling.
  • a board is also punched out of a steel strip, however, there is no pre-deformation, but the board is fed directly to the furnace. After the heat treatment, the hot board is fed to the press and deformed in an indirectly water-cooled tool and simultaneously press-hardened. Subsequently, the molded components are trimmed again if necessary.
  • roller hearth furnaces have prevailed for reasons of process reliability and economy.
  • the Hubbalkenofen be called, in which the metal parts are transported by lifting bars through the oven.
  • Multi-layer chamber furnaces are also becoming increasingly important.
  • continuous furnaces for this process are usually equipped with inlet and outlet locks, since in the indirect process uncoated components must be heat-treated. In order to avoid scaling of the component surface, such a furnace must be operated with inert gas. These inlet and outlet locks serve to prevent the air from entering the oven. Chamber furnaces for this procedure can also be equipped with a lock. However, it is also possible with this type of furnace to exchange the atmosphere in the furnace chamber for each cycle. Continuous furnaces for this process must be equipped with a product carrier return conveyor system to ensure the circulation of product carriers. Ceramic ovens are used in these ovens. Only the entry and exit tables and the goods carrier return conveyor are equipped with metal conveyor rollers.
  • Another advantage of this type is the positive effect of the conveyor roller on the uniform heating of the metal parts to be treated to see: heated by the furnace heating with stationary rollers heated by radiation and heat conduction transported on them and therefore in contact with them in contact metal part in addition ,
  • these ovens are operated with a significantly lower energy consumption, since there are no goods carriers that can cool down on the return transport after the oven flow and must therefore be reheated in the oven in a new run again.
  • the direct method is therefore preferably used with the use of continuous furnaces.
  • Al-silicon coated sheets are used for press-hardened components for the automotive industry.
  • the coating prevents the rusting of the sheets, as well as a scaling of the hot sheets on the transfer from the oven to the press.
  • the Al-Si of the coating diffuses when heating the board to hardening temperature in the steel surface and protects the base material against scaling.
  • boron-alloyed tempering steels such as 22MnB5 (material number 1.5528) or 30MnB5 (material number 1.5531) are being used as the base material.
  • a major disadvantage of direct press-hardening in the above-described roller hearth furnaces is that Al-Si-coated sinkers are placed directly on the ceramic conveyor rollers, thereby causing strong thermochemical reactions between the Al-Si coating and the ceramic rollers.
  • Another major disadvantage of the described process is the cycle time, as the predominant furnace time is used to melt the Al-Si on the surface and to diffuse into the substrate surface in order to achieve the desired welding, corrosion and paint adhesion properties.
  • rollers currently in use in roller hearth furnaces are hollow rollers made of the material sintered mullite (3Al 2 O 3 • 2SiO 2 ) and solid rollers made of fused silica.
  • the fused quartz rolls consist of more than 99% SiO 2 and have an application limit of about 1100 ° C with the disadvantage that they bend at about 700 ° C to 800 ° C by its own weight.
  • Rollers made of sintered mullite can be loaded up to 1350 ° C without causing significant bending.
  • the big advantage of both materials is the high thermal shock resistance. However, both materials have a very high affinity to react with molten aluminum to different aluminum silicate or even silicide compounds.
  • As a result of the Al-Si coating during the heating to the approximately 930 ° C. required for the diffusion, a molten phase of the coating passes through at approximately 670 ° C.
  • the short-term melt of the coating has proven to be very aggressive on the furnace rollers and destroys them under unfavorable circumstances within
  • the object of the invention is to specify a method and a device in which aluminum-silicon can be diffused into a surface of a sheet-steel web and wherein from the thus-treated sheet-steel web a form hardened in the press hardening steel sheet component can be produced, wherein the disadvantages described are avoided.
  • this object is achieved by a method having the features of independent claim 1.
  • Advantageous developments of the method will become apparent from the dependent claims 2 to 8.
  • the object is further achieved by a device according to claim 9.
  • Advantageous embodiments of the device will become apparent from the dependent claims 10 to 16.
  • Al-Si is diffused into both surfaces of a sheet-steel web coated on both sides with Al-Si.
  • the steel sheet web is taken directly from a first Stahlblechcoil.
  • the coil form corresponds to the usual delivery form of sheet steel tracks.
  • the steel sheet web after being passed through the furnace and slowly cooling to a temperature at which soft ferrite / pearlite microstructure is formed is wound up into a second Stahlblechcoil. Due to the winding, the diffusion of the Al-Si from the next process step, for example the punching of boards, can be decoupled so that cycle times do not have to be coordinated.
  • the steel sheet web pretreated in the inventive method can also be further processed immediately, whereby the winding up to a second steel sheet coil can be dispensed with.
  • the steel sheet web is heated in a first furnace part to diffusion temperature. After reaching the required diffusion time and a possible final annealing to achieve certain desired physical parameters, the steel sheet web is cooled in a second furnace part of the same furnace after the diffusion of Al-Si into a surface of the steel sheet to a temperature at which ferrite / pearlite microstructure forms.
  • the cooling rate is less than 25K / sec.
  • the steel sheet web is guided on a hot air pad without contact through the oven.
  • the hot air can also have diffusion temperature, so that Al-Si is diffused into both surfaces of the sheet steel web.
  • the sheet steel web floats without contact through the oven, so that no harmful Reaction of the molten Al-Si with support means, such as rollers or walking beams take place.
  • the steel sheet web is passed through the furnace by applying a tensile force.
  • the pulling force can be unwound via the take-off means, for example a driven second reel on which the treated sheet steel web can be wound into a coil in connection with a braked first reel, from which the untreated Al-Si-coated steel sheet web is unwound from a coil. be applied.
  • the steel sheet trajectory follows a rope line through the furnace, for example, between the unwinding from the first reel and the winding point on the second reel depending on the applied tensile force and the distance of the unwinding from the winding point.
  • the device for producing a hot air cushion can be dispensed with.
  • this cable pull method can also be combined with the hot air cushion. This is particularly advantageous if, for example, for reasons of faster passage through the furnace while maintaining constant the diffusion time and a possible final annealing and the slow cooling with a cooling rate of less than 25K / sec to a temperature at which forms ferrite / pearlite, the oven length is longer. With a larger furnace length, the tensile force applied to the sheet steel web must be increased. When combined with the hot air cushion, however, the tensile force can be reduced.
  • the furnace is arranged substantially vertically.
  • the sheet steel web is advantageously guided from top to bottom through the oven.
  • This feed-through direction has advantages in terms of temperature control, since the first furnace region with the higher diffusion temperature in this way is arranged above the second furnace region with the lower temperature at which a ferritic / pearlitic microstructure forms. But it is also possible to choose the direction of implementation of the steel sheet web from bottom to top.
  • the furnace has a heatable to diffusion temperature first region, wherein the Al-Si-coated steel sheet web is guided through the furnace without contact. From the thus treated sheet steel web a form hardened in the press hardening steel sheet component can be produced.
  • the furnace has a device for producing a hot air cushion, on which the sheet-steel web can be guided without contact through the furnace.
  • the hot air can also have diffusion temperature, so that Al-Si can be diffused into both surfaces of the sheet steel web.
  • the steel sheet web floats without contact through the furnace, so that no damaging reaction of molten Al-Si to support devices, such as rollers or walking beams, can take place.
  • the furnace as a device for producing a hot air cushion on a hot air nozzle.
  • the furnace comprises means for applying a tensile force to the steel sheet web for non-contact passage of the steel sheet web through the furnace.
  • the steel sheet is held under tension so that it does not sag at least so far that it touches the oven.
  • the cable can also be combined with the hot air cushion. This is particularly advantageous if the oven is too long, so that the sheet steel web would sag too much despite the applied tensile force.
  • the tensile force can also be reduced in the combination of hot air cushion and cable, so that no or only low voltages are introduced into the sheet steel web.
  • the furnace is arranged substantially vertically.
  • the Al-Si-coated sheet steel web can be guided without contact from top to bottom through the oven, without the need for a hot air cushion or a cable.
  • this embodiment can both with the application of a tensile force and / or a Hot air cushion can be combined, wherein the hot air cushion can also be present on both sides of the sheet steel web.
  • the furnace further has a second furnace region arranged in the feedthrough direction of the steel sheet web behind the first furnace region, wherein the steel sheet web can be cooled to a temperature during passage through the second furnace region at a rate of less than 25 K / sec , in which forms soft ferrite / pearlitic structure.
  • the steel sheet web can be cooled to such a temperature, wherein the cooling rate of less than 25 K / sec can be reliably maintained.
  • Soft ferrite / pearlite microstructure forms, which makes it possible to cut the individual blanks later in the stamping process.
  • the apparatus further comprises a feeding device for feeding the steel sheet web to the furnace and a take-off device for removing the steel sheet web from the furnace.
  • a voltage can be applied to the sheet steel web of the feed and the exhaust device, so that it does not sag too much in a substantially horizontal furnace arrangement and the tensile force does not exceed the tensile strength of a rope line.
  • the feed device has a first reel and the take-off device has a second reel.
  • a coil can be clamped as a standard delivery form of steel strip on the first reel.
  • the second reel can rewind the pre-treated sheet steel strip as a coil.
  • the second reel can also be omitted if the pretreated steel strip immediately further processed, for example, fed to a punching device to be.
  • the low dew point furnace can be operated from -70 ° C to + 10 ° C, especially from about + 5 ° C to + 10 ° C.
  • Fig. 1 shows a device according to the invention in horizontal design.
  • the device has a first reel 210 with a first Stahlblechcoil 310 located thereon.
  • the first steel sheet coil 310 consists of a wound Al-Si coated steel sheet 300 in belt form.
  • a feed device in addition to the first reel 210 continue to guide rollers (not shown).
  • the furnace 100 has a first furnace region 110 which is heated to a temperature at which the Al-Si of the coating diffuses into the surface of the sheet-steel sheet 300. At the same time, iron diffuses from the steel sheet substrate into the Al-Si.
  • the result is a refractory aluminum-silicon-iron alloy on the surface of the sheet steel web.
  • the heating of the furnace via the heaters 150 and a hot air cushion 165 which is generated via hot air nozzles 160 under the sheet-steel web.
  • the steel sheet 300 floats on the hot air cushion 165 through the oven 100 without touching it.
  • Other support or guide elements such as rollers or the like, are not required.
  • the heaters 160 are gas burners. But there are also conceivable, for example, electric infrared heaters or hot air heaters.
  • the length of the first furnace area is 300 depending on the speed of the steel sheet 300 so that the steel sheet is heated to the diffusion temperature, for example, 930 ° C to 950 ° C and the required diffusion time remains at this temperature. Also is one possible final glow time in the length measurement of the first furnace area 110 taken into account.
  • a second furnace region 120 follows the first furnace region 110 in the feedthrough direction of the steel sheet web. The temperature guide in the second furnace region 120 and the length of the second furnace region 120 are dimensioned so that the steel sheet web can be moved into the temperature range of ferrite melt at a cooling rate of less than 25 K / sec. / Perlite microstructure is cooled so that subsequently a board can be punched out of the sheet steel web.
  • the second furnace area 120 is followed by a take-off device with a second reel 220.
  • the second reel 220 also rotates in a clockwise direction, whereby the pretreated sheet steel web is rewound to a second coil 320.
  • a take-off device may further include guide rollers (not shown) adjacent to the second reel 220.
  • Fig. 2 shows a device according to the invention in vertical design.
  • the furnace 100 is designed as a tower in a substantially vertical direction.
  • the steel sheet 300 is passed from top to bottom through the furnace 100. Due to the vertical construction, no measures such as the provision of hot air cushions or cable pull devices are required in order to guide the sheet steel web without contact through the furnace 100.
  • the implementation direction from top to bottom facilitates the temperature control in the furnace, since the cooler second furnace region 120 is below the heated to diffusion temperature first furnace region 110. Since a hot air cushion 165 is not needed, heaters 150 are provided for homogeneously heating both surfaces of the steel strip 300 on both sides of the furnace. These can be carried out as in the case of the horizontal arrangement, for example as a gas burner or as hot air heaters or, for example, electric radiant heaters.
  • Feed and discharge device for the sheet steel strip 300 are constructed analogously to the horizontal embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Coating With Molten Metal (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP13173619.1A 2013-06-25 2013-06-25 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier Active EP2818571B1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP13173619.1A EP2818571B1 (fr) 2013-06-25 2013-06-25 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier
US14/896,965 US20160145733A1 (en) 2013-06-25 2014-06-23 Inward diffusion of aluminum-silicon into a steel sheet
BR112015032358-8A BR112015032358B1 (pt) 2013-06-25 2014-06-23 Difusão de alumínio-silício em uma chapa de aço
CA2915440A CA2915440A1 (fr) 2013-06-25 2014-06-23 Diffusion d'alumino-silicium dans une bande continue de tole d'acier
CN201480034321.1A CN105518177A (zh) 2013-06-25 2014-06-23 从铝-硅到钢板的向内扩散
KR1020167001874A KR20160058746A (ko) 2013-06-25 2014-06-23 강판의 알루미늄-실리콘 확산코팅
MX2015017681A MX2015017681A (es) 2013-06-25 2014-06-23 Difusion de aluminio - silcio en una lamina de chapa de acero.
JP2016520523A JP6583638B2 (ja) 2013-06-25 2014-06-23 アルミニウムシリコンを鋼板表面内に拡散する技術
PCT/EP2014/063150 WO2014206933A1 (fr) 2013-06-25 2014-06-23 Diffusion d'alumino-silicium dans une bande continue de tôle d'acier
EP14733592.1A EP3013994B1 (fr) 2013-06-25 2014-06-23 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13173619.1A EP2818571B1 (fr) 2013-06-25 2013-06-25 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier

Publications (2)

Publication Number Publication Date
EP2818571A1 true EP2818571A1 (fr) 2014-12-31
EP2818571B1 EP2818571B1 (fr) 2017-02-08

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EP13173619.1A Active EP2818571B1 (fr) 2013-06-25 2013-06-25 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier
EP14733592.1A Active EP3013994B1 (fr) 2013-06-25 2014-06-23 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier

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EP14733592.1A Active EP3013994B1 (fr) 2013-06-25 2014-06-23 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier

Country Status (9)

Country Link
US (1) US20160145733A1 (fr)
EP (2) EP2818571B1 (fr)
JP (1) JP6583638B2 (fr)
KR (1) KR20160058746A (fr)
CN (1) CN105518177A (fr)
BR (1) BR112015032358B1 (fr)
CA (1) CA2915440A1 (fr)
MX (1) MX2015017681A (fr)
WO (1) WO2014206933A1 (fr)

Cited By (2)

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CN104878188A (zh) * 2015-05-20 2015-09-02 东北大学 一种可实现铝带气垫式热处理的实验装置及实验方法
WO2018158165A1 (fr) 2017-02-28 2018-09-07 Tata Steel Ijmuiden B.V. Procédé de fabrication d'une bande d'acier comprenant une couche de revêtement en alliage d'aluminium

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
KR101858863B1 (ko) 2016-12-23 2018-05-17 주식회사 포스코 내식성 및 가공성이 우수한 용융 알루미늄계 도금강재
CN109764674B (zh) * 2019-01-27 2021-01-05 安徽华淮澄膜科技有限公司 用于粉体材料烧结成型的高温隧道炉

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US5922409A (en) * 1994-02-28 1999-07-13 Sermatech International, Inc. Method for forming a coating substantially free of deleterious refractory elements on a nickel- and chromium-based superalloy
DE10303228B3 (de) * 2003-01-28 2004-04-15 Kramer, Carl, Prof. Dr.-Ing. Vorrichtung zur Wärmebehandlung metallischer Bänder im Durchlauf

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Publication number Priority date Publication date Assignee Title
CN104878188A (zh) * 2015-05-20 2015-09-02 东北大学 一种可实现铝带气垫式热处理的实验装置及实验方法
WO2018158165A1 (fr) 2017-02-28 2018-09-07 Tata Steel Ijmuiden B.V. Procédé de fabrication d'une bande d'acier comprenant une couche de revêtement en alliage d'aluminium
US11319623B2 (en) 2017-02-28 2022-05-03 Tata Steel Ijmuiden B.V. Method for producing a steel strip with an aluminium alloy coating layer

Also Published As

Publication number Publication date
BR112015032358A2 (pt) 2017-07-25
JP6583638B2 (ja) 2019-10-02
EP2818571B1 (fr) 2017-02-08
US20160145733A1 (en) 2016-05-26
JP2016529386A (ja) 2016-09-23
KR20160058746A (ko) 2016-05-25
BR112015032358B1 (pt) 2020-09-24
EP3013994A1 (fr) 2016-05-04
WO2014206933A1 (fr) 2014-12-31
CN105518177A (zh) 2016-04-20
EP3013994B1 (fr) 2020-03-04
MX2015017681A (es) 2016-06-14
CA2915440A1 (fr) 2014-12-31

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