EP3013994B1 - 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
EP3013994B1
EP3013994B1 EP14733592.1A EP14733592A EP3013994B1 EP 3013994 B1 EP3013994 B1 EP 3013994B1 EP 14733592 A EP14733592 A EP 14733592A EP 3013994 B1 EP3013994 B1 EP 3013994B1
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Prior art keywords
furnace
sheet steel
steel web
web
steel sheet
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German (de)
English (en)
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EP3013994A1 (fr
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Rolf-Josef Schwartz
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Schwartz GmbH
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Schwartz GmbH
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    • 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
    • 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
    • C21D9/46—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 a device and a method for diffusing aluminum-silicon (Al-Si) into a surface of an Al-Si-coated steel sheet web, in which a high-melting aluminum-silicon-iron alloy is formed by the diffusion.
  • the aim is to reduce the fuel consumption of motor vehicles and to reduce CO 2 emissions, but at the same time to increase occupant safety.
  • body components with a favorable strength-to-weight ratio.
  • these components include, in particular, A and B pillars, side impact protection beams in doors, sills, frame parts, bumpers, cross beams for floor and roof, front and rear side members.
  • the body shell with a safety cage usually consists of a hardened steel sheet with a strength of approximately 1,500 MPa.
  • furnaces for heat treatment have prevailed for reasons of process reliability and economy.
  • the metal parts to be treated are continuously conveyed through the furnace.
  • chamber furnaces can also be used in which the metal parts are produced in batches placed in a chamber, warmed there and then removed again.
  • a blank is punched out of a sheet steel strip, cold formed and the component thus preformed is fed to the heat treatment. After the heat treatment, the hot component is fed to the press in an indirectly cooled tool. Then the components are trimmed again and sandblasted to remove any existing scaling.
  • a board is also punched out of a sheet steel strip, but there is no pre-deformation here, but the board is fed directly to the furnace. After the heat treatment, the hot plate is fed to the press and deformed in an indirectly water-cooled tool and at the same time press-hardened. The molded components are then trimmed again if necessary.
  • roller hearth furnaces have become established for both processes for reasons of process reliability and economy.
  • the walking beam furnace in which the metal parts are transported through the furnace by means of walking beams, can be cited as an alternative furnace design.
  • Multi-layer chamber furnaces are also becoming increasingly important.
  • continuous furnaces for this process are usually equipped with inlet and outlet locks, since uncoated components have to be heat-treated in the indirect process. To avoid scaling of the component surface, such an oven must be operated with protective gas. These inlet and outlet locks are used to prevent air from entering the furnace. Chamber furnaces for this process can also be equipped with a lock. With this type of furnace, however, it is also possible to exchange the atmosphere in the furnace chamber for each cycle. Continuous furnaces for this process must be equipped with a goods carrier return system to ensure the circulation of the goods carriers. Ceramic conveyor rollers are used in these ovens. Only the entry and exit tables and the goods carrier return conveyor are equipped with metallic conveyor rollers.
  • these ovens can be operated with a significantly lower energy input, since there are no goods carriers that can cool down on the return transport after the oven has passed through and therefore have to be heated up again in the oven when they are run again.
  • the direct method is therefore preferably used with the use of continuous furnaces.
  • the sheets used in vehicle construction should not rust if possible. Scaling should also be avoided during the processing process, since such scaling must be removed in a complex and costly manner for further processing, at the latest before the welding or painting process. Since untreated steel sheets would inevitably scale in the presence of oxygen at the high temperatures required for press hardening, it is common to use coated sheets and / or to carry out the heat treatment process in the absence of oxygen.
  • a device for heat treatment of metallic strips in a pass, in particular for operation under protective gas of low density is known.
  • the device has stabilizing nozzle systems which stabilize the course of the strip and which in the heating part and at least in the first part of the cooling effect the heat transfer predominantly with forced convection.
  • the belt is guided in the treatment part delimited by rollers without contact.
  • the band course has a concave curvature in the treatment area, at least in a partial area. The region of this concave curvature can take place in a fluid which is different from the fluid with which the band is blown in the heating part and at least in the first part of the cooling region.
  • Aluminum-silicon (Al-Si) coated sheets are usually used for press-hardened components for the automotive industry.
  • the coating prevents the sheets from rusting and prevents the hot sheets from scaling on the transfer from the furnace to the press.
  • the Al-Si of the coating diffuses into the steel surface when the board is heated to the hardening temperature and protects the base material against scaling.
  • Boron-alloyed tempering steels such as 22MnB5 (material number 1.5528) or 30MnB5 (material number 1.5531), have recently been used as the base material.
  • Al-Si diffusion coatings are in the documents WO 93/23247 and US 5,922,409
  • a major disadvantage of direct press hardening in the roller hearth furnaces described above lies in the fact that Al-Si-coated blanks are placed directly on the ceramic conveyor rollers, and this leads to strong thermo-chemical reactions between the Al-Si coating and the ceramic roll comes.
  • Another major disadvantage of the method described is the cycle time, since the majority of the furnace time is used to deposit the Al-Si melt the surface and diffuse into the substrate surface so that the desired welding, corrosion and paint adhesion properties are achieved.
  • rollers currently in use in roller hearth furnaces are hollow rollers made of sinter-mullite (3Al 2 0 3 ⁇ 2Si0 2 ) and solid rollers made of quartz.
  • the quartz material rolls consist of over 99% Si0 2 and have an application limit of approx. 1100 ° C with the disadvantage that they bend at approx. 700 ° C to 800 ° C due to their own weight.
  • Rolls made of sintered mullite can be used up to 1350 ° C without significant bending.
  • the great advantage of both materials is the high resistance to temperature changes. However, both materials have a very high affinity to react with molten aluminum to form different aluminum silicate or even silicide compounds.
  • the Al-Si coating causes the molten phase of the coating to pass through at about 670 ° C during heating to the approximately 930 ° C required for diffusion.
  • the short-term melting of the coating has proven to be very aggressive on the oven rolls and, under unfavorable circumstances, destroys them within a few days.
  • the object of the invention is to provide a method and a device in which aluminum-silicon can be diffused into a surface of a sheet steel sheet and wherein a sheet steel component which has been compression-hardened in the press hardening process can be produced from the sheet steel sheet thus treated, the disadvantages described being avoided.
  • this object is achieved by a method having the features of independent claim 1.
  • Advantageous developments of the method result from subclaims 2 to 8.
  • the object is further achieved by a device according to claim 9.
  • Advantageous embodiments of the device result from subclaims 10 to 16.
  • the method according to the invention for diffusing Al-Si into a surface of an Al-Si-coated sheet steel sheet is characterized by the following steps: First, the sheet steel sheet is fed to a furnace which can be heated to a diffusion temperature of 930 ° C to 950 ° C and then passed through the furnace which has been heated to a diffusion temperature without contact. The sheet steel sheet is heated to the diffusion temperature, with Al-Si diffusing into a surface of the sheet steel sheet. At the same time, iron also diffuses from the sheet steel substrate into the Al-Si layer on the surface of the sheet steel sheet. A high-melting aluminum-silicon-iron alloy is created on the surface of the sheet steel sheet.
  • the sheet steel sheet is then cooled at a speed of less than approximately 25K / sec, so that a ferrite / pearlite structure is created.
  • the result is a treated sheet steel sheet, from which a sheet steel component that is form-hardened by means of press hardening can be produced in a later process step.
  • a steel plate can first be cut from the treated soft steel sheet, which can then be heated to the martensite formation temperature for the press hardening process, for example in a conventional roller hearth furnace, without it becoming a liquid phase of Al-Si and thus one of the rolls of the Roller hearth stove comes damaging reaction.
  • Al-Si is diffused into both surfaces of a steel sheet web coated on both sides with Al-Si.
  • the sheet steel web is advantageously taken directly from a first sheet steel coil.
  • the coil form corresponds to the usual form of delivery of sheet steel sheeting.
  • 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 omitted.
  • the steel sheet web is heated to diffusion temperature in a first furnace part. After 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 Al-Si has diffused into a surface of the steel sheet web to a temperature at which ferrite / pearlite structure is formed.
  • the cooling rate is less than 25K / sec. This enables the individual blanks to be cut later using the punching process.
  • the steel sheet web can then be quickly cooled to a handling temperature for better handling.
  • the sheet steel sheet is guided through the furnace without contact on a hot air cushion.
  • the hot air can also have a diffusion temperature so that Al-Si is diffused into both surfaces of the steel sheet web.
  • the sheet steel sheet floats on the hot air cushion contactlessly through the oven, so that no damaging Reaction of the melted Al-Si with support devices such as rollers or walking beams can take place.
  • the sheet steel sheet is guided through the furnace by applying a tensile force.
  • the pulling force can be via the pull-off means, for example a driven second reel on which the treated steel sheet 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 sheet steel sheet follows a rope line through the furnace, for example, it sags between the unwinding point 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 process can also be combined with the hot air cushion.
  • the furnace length is chosen longer. If the furnace length is longer, the tensile force applied to the sheet steel sheet must be increased. When combined with the hot air cushion, however, the pulling force can be reduced.
  • the furnace is arranged essentially vertically.
  • the sheet steel sheet is advantageously guided through the furnace from top to bottom.
  • This direction of implementation has advantages with regard to temperature control, since the first furnace region with the higher diffusion temperature is thus arranged above the second furnace region with the lower temperature, at which a ferritic / pearlitic structure is formed.
  • the inventive device for diffusing Al-Si into a surface of an Al-Si-coated sheet steel sheet is defined in the claims and characterized in that the Device has a furnace, the furnace having a first region that can be heated to the diffusion temperature, wherein the Al-Si-coated sheet steel sheet can be passed through the furnace without contact.
  • a sheet steel component that is form-hardened in the press hardening process can be produced from the sheet steel web treated in this way.
  • the furnace has a device for producing a hot air cushion, on which the sheet steel sheet can be passed through the furnace without contact.
  • the hot air can also have a diffusion temperature, so that Al-Si can be diffused into both surfaces of the steel sheet web.
  • the steel sheet web floats on the hot air cushion contactlessly through the furnace, so that no damaging reaction of melted Al-Si on supporting devices, such as rollers or walking beams, can take place.
  • the furnace has a hot air nozzle as a device for producing a hot air cushion.
  • the furnace has a device for applying a tensile force to the steel sheet web for the contactless passage of the steel sheet web through the furnace.
  • the sheet steel sheet is kept under tension so that it at least does not sag so far that it touches the furnace.
  • the cable can also be combined with the hot air cushion. This is particularly advantageous if the furnace is too long, so that the sheet steel sheet would sag too much despite the tensile force applied.
  • the combination of hot air cushion and cable pull can also reduce the tensile force so that no or only low stresses are introduced into the sheet steel sheet.
  • the furnace is arranged essentially vertically.
  • the Al-Si-coated sheet steel sheet can be passed through the furnace from top to bottom without contact, without the need for a hot air cushion or a cable.
  • this embodiment can also be applied with a tensile force and / or Hot air cushion can be combined, 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 behind the first furnace region in the direction of passage of the steel sheet web, the steel sheet web being able to be cooled to a temperature at a rate of less than 25 K / sec during the passage through the second furnace region, at which soft ferritic / pearlitic structure.
  • the steel sheet web can be cooled to such a temperature by the provision of the second furnace area, the cooling rate of less than 25 K / sec being reliably maintained. This creates a soft ferrite / pearlite structure, which enables the individual blanks to be cut to size later using the stamping process.
  • the device also has a feed device for feeding the sheet steel sheet to the furnace and a removal device for pulling the sheet steel sheet out of the furnace.
  • a tension can be applied to the steel sheet web by the feed and withdrawal devices, so that it does not sag too much when the furnace is essentially horizontal and the tensile force does not exceed the tensile strength following a rope line.
  • the feed device has a first reel and the take-off device has a second reel.
  • a coil can be clamped onto the first reel as a standard form of delivery of sheet steel strips.
  • the second reel can rewind the pre-treated steel strip as a coil.
  • the second reel can also be omitted if the pretreated sheet steel strip is to be further processed immediately, for example fed to a punching device.
  • the furnace can be operated with a low dew point from -70 ° C to + 10 ° C, in particular from approx. + 5 ° C to + 10 ° C.
  • Fig. 1 shows a device according to the invention in a horizontal design.
  • the device has a first reel 210 with a first steel sheet coil 310 located thereon.
  • the first sheet steel coil 310 consists of a wound Al-Si-coated sheet steel sheet 300 in strip form.
  • a feed device can furthermore have 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 steel sheet web 300. At the same time, iron diffuses from the steel sheet substrate into the Al-Si.
  • a high-melting aluminum-silicon-iron alloy is created on the surface of the sheet steel sheet.
  • the furnace is heated via the heaters 150 and a hot air cushion 165, which is generated via hot air nozzles 160 under the sheet steel sheet.
  • the sheet steel sheet 300 floats on the hot air cushion 165 through the furnace 100 without touching it. Additional supporting or guiding elements, such as rollers or the like, are not required. As a result, no damaging reaction of melted Al-Si with these support and / or guide elements can take place.
  • the heaters 160 are gas burners. However, electric infrared heaters or hot air heaters are also conceivable, for example.
  • the length of the first furnace region is dimensioned as a function of the throughput speed of the steel sheet web 300 such that the steel sheet web is heated to the diffusion temperature of, for example, 930 ° C. to 950 ° C. and the required diffusion time remains at this temperature. Is also one Possible final glow time is taken into account when dimensioning the length of the first furnace area 110.
  • a second furnace region 120 follows the first furnace region 110 in the direction of passage of the steel sheet web.
  • the temperature control in the second furnace region 120 and the length of the second furnace region 120 are dimensioned such that the steel sheet web reaches the temperature range of ferrite with a cooling rate of less than 25 K / sec. / Perlite structure is cooled so that a board can then be punched out of the sheet steel sheet.
  • An extraction device with a second reel 220 is connected to the second furnace region 120.
  • the second reel 220 also rotates clockwise, as a result of which the pretreated sheet steel web is rewound into a second coil 320.
  • a pull-off device can also have guide rollers (not shown).
  • Fig. 2 shows a device according to the invention in a vertical design.
  • the furnace 100 is designed as a tower in a substantially vertical direction.
  • the sheet steel sheet 300 is passed through the furnace 100 from top to bottom. Due to the vertical construction, no measures such as the provision of hot air cushions or cable pulling devices are necessary in order to guide the steel sheet web through the furnace 100 without contact.
  • the direction of passage from top to bottom facilitates temperature control in the furnace, since the cooler second furnace region 120 is located below the first furnace region 110 heated to the diffusion temperature.
  • 100 heaters 150 are provided on both sides of the furnace for homogeneous heating of both surfaces of the steel sheet strip 300. As in the case of the horizontal arrangement, these can be designed, for example, as gas burners or as hot air heaters or, for example, electric radiant heaters.
  • Feeding and withdrawing device for the 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)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (15)

  1. Procédé de diffusion d'Al-Si dans une surface d'une tôle d'acier (300) revêtue d'Al-Si, dans lequel un composant de tôle d'acier durci à la presse peut être fabriqué à partir de la tôle d'acier (300) traitée,
    caractérisé par les étapes consistant à
    a. amener la tôle d'acier (300) à un four (100) chauffable à une température de diffusion allant de 930 °C à 950 °C ;
    b. passer sans contact la tôle d'acier (300) revêtue d'Al-Si à travers le four (100) chauffé à la température de diffusion, chauffer la tôle d'acier (300) à la température de diffusion et diffuser l'Al-Si dans une surface de la tôle (300) ;
    c. refroidir la tôle d'acier (300) avec de l'Al-Si diffusé dans une surface à une vitesse inférieure à environ 25 K/s à une température inférieure à celle de la formation de martensite.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la tôle d'acier (300) est revêtue sur les deux faces d'Al-Si et diffuse de l'Al-Si dans les deux surfaces.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    la tôle d'acier (300) est enlevée d'une première bobine de tôle d'acier (310).
  4. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la tôle d'acier (300) est enroulée dans une seconde bobine de tôle d'acier (320) après passage dans le four (100) et refroidie dans la plage de température de la structure ferrite/perlite.
  5. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la tôle d'acier (300) est chauffée à la température de diffusion dans une première région de four (110) et refroidie à la plage de température de la structure ferrite/perlite dans une seconde région de four (120) du même four après diffusion de l'Al-Si dans une surface de la bande de tôle (300) à une vitesse inférieure à 25 K/s.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la tôle d'acier (300) est guidée sans contact à travers le four (100) sur un coussin à air chaud (165).
  7. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la bande de tôle d'acier (300) est guidée au moyen de l'application d'une force de traction à travers le four (100).
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le four (100) est disposé de manière sensiblement verticale et la tôle d'acier (300) est guidée de haut en bas dans le four (100).
  9. Dispositif pour la diffusion d'Al-Si dans une surface d'une tôle d'acier (300) revêtue d'Al-Si, dans lequel un flan de tôle d'acier durcissable à la presse et durcissable peut être produit à partir de la tôle d'acier (300) traitée, le dispositif ayant un four (100), le four (100) ayant une première région (110) qui peut être chauffée à une température de diffusion, la tôle d'acier (300) revêtue d'Al-Si pouvant traverser le four (100) sans contact, le four (100) ayant en outre une seconde région de four (120) disposée derrière la première région de four (110) dans la direction de passage de la tôle d'acier (300),
    caractérisé en ce que
    la longueur de la seconde région de four (120) en liaison avec la régulation de température dans cette région est dimensionnée de sorte que la tôle d'acier (100) peut être refroidie à une vitesse inférieure à 25 K/s dans la plage de température de la structure ferrite/perlite en traversant la seconde région de four (120).
  10. Dispositif selon la revendication 9,
    caractérisé en ce que
    le four (100) comprend un dispositif pour générer un coussin d'air chaud (165) sur lequel la bande de tôle d'acier (300) peut traverser le four (100) sans contact.
  11. Dispositif selon la revendication 10,
    caractérisé en ce que
    le four (100) comprend une buse à air chaud 160 pour générer un coussin d'air chaud (165).
  12. Dispositif selon l'une quelconque des revendications 9 à 11,
    caractérisé en ce que
    le four (100) comprend un dispositif pour appliquer une force de traction sur la bande de tôle d'acier (300) pour faire passer la tôle d'acier (300) dans le four (100) sans contact.
  13. Dispositif selon l'une quelconque des revendications 9 à 12,
    caractérisé en ce que
    le four (100) est disposé de manière sensiblement verticale, la bande de tôle d'acier (300) revêtue d'Al-Si pouvant être traversée sans contact de haut en bas.
  14. Dispositif selon l'une quelconque des revendications 9 à 13,
    caractérisé en ce que
    l'appareil comprend en outre un dispositif d'alimentation pour amener la tôle d'acier (300) au four (100) et un moyen d'extraction (220) pour tirer la tôle d'acier (300) du four (100).
  15. Dispositif selon la revendication 14,
    caractérisé en ce que
    le moyen d'alimentation comprend une première bobine (210) et le moyen d'extraction (220) comprend une seconde bobine (220).
EP14733592.1A 2013-06-25 2014-06-23 Incorporation par diffusion de silicium-aluminium dans une bande de tôle d'acier Active EP3013994B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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 (3)

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
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

Publications (2)

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EP3013994A1 EP3013994A1 (fr) 2016-05-04
EP3013994B1 true EP3013994B1 (fr) 2020-03-04

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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
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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)

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CN104878188B (zh) * 2015-05-20 2017-02-22 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
KR101858863B1 (ko) 2016-12-23 2018-05-17 주식회사 포스코 내식성 및 가공성이 우수한 용융 알루미늄계 도금강재
MX2019010192A (es) 2017-02-28 2019-10-02 Tata Steel Ijmuiden Bv Metodo para producir un producto de acero recubierto formado en caliente.
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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Also Published As

Publication number Publication date
WO2014206933A1 (fr) 2014-12-31
MX2015017681A (es) 2016-06-14
US20160145733A1 (en) 2016-05-26
EP2818571B1 (fr) 2017-02-08
CA2915440A1 (fr) 2014-12-31
KR20160058746A (ko) 2016-05-25
BR112015032358B1 (pt) 2020-09-24
JP6583638B2 (ja) 2019-10-02
JP2016529386A (ja) 2016-09-23
BR112015032358A2 (pt) 2017-07-25
CN105518177A (zh) 2016-04-20
EP3013994A1 (fr) 2016-05-04
EP2818571A1 (fr) 2014-12-31

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