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WO2025078189A1 - Production de bandes métalliques laminées à chaud en tant que produit préliminaire ou intermédiaire pour bande d'acier électrique à grains orientés - Google Patents

Production de bandes métalliques laminées à chaud en tant que produit préliminaire ou intermédiaire pour bande d'acier électrique à grains orientés Download PDF

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Publication number
WO2025078189A1
WO2025078189A1 PCT/EP2024/077420 EP2024077420W WO2025078189A1 WO 2025078189 A1 WO2025078189 A1 WO 2025078189A1 EP 2024077420 W EP2024077420 W EP 2024077420W WO 2025078189 A1 WO2025078189 A1 WO 2025078189A1
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WO
WIPO (PCT)
Prior art keywords
temperature
slabs
plant
conditioning device
temperature conditioning
Prior art date
Application number
PCT/EP2024/077420
Other languages
German (de)
English (en)
Inventor
Andreas Böttcher
Wolfgang Lenz
Daniel BRYKARCZYK
Original Assignee
Sms Group Gmbh
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Filing date
Publication date
Application filed by Sms Group Gmbh filed Critical Sms Group Gmbh
Publication of WO2025078189A1 publication Critical patent/WO2025078189A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • 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
    • C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor
    • 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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the invention relates to a plant and a method for producing hot-rolled metal strips as a precursor or intermediate product for grain-oriented electrical steel.
  • a further development of such combined casting and rolling plants comprises one or more continuous casting plants for casting slabs with die dimensions of approximately 40 to 165 mm and two (or more) spatially separated groups of rolling stands for forming the strand into an intermediate strip or hot strip.
  • the rolling stand groups include, for example, a roughing mill, a finishing mill, and possibly a middle rolling mill. Plants with separate rolling stand groups are described, for example, in DE 10 2020 214427 A1 and DE 10 2020 209 299 A1.
  • Grain-oriented electrical steel also known as grain-oriented silicon steel or grain-oriented electrical sheet, is a special material used in the electrical industry. It is characterized by a high magnetic Permeability and low magnetic hysteresis losses.
  • the manufacturing process of grain-oriented electrical steel involves rolling the steel in a specific direction to create a uniform crystal structure.
  • Known processes for producing GO starting material are currently not applicable to combined casting and rolling plants with separate rolling stands, or they do not produce the desired product quality, as the conventional processes are not designed for implementation on casting and rolling plants with separate rolling mills.
  • GO starting material typically accounts for only a small proportion of the total production of a combined casting and rolling plant. The plant design is therefore geared to the requirements of other materials. The feasibility of a previously known process for producing GO starting material is not necessarily the focus.
  • the system comprises a casting machine, which is preferably implemented as a vertical bending machine or arc caster.
  • the casting machine can also be implemented in another way, as long as it produces a strand or slabs from silicon-containing molten steel, in particular in continuous casting.
  • the slabs cast in this way have a thickness of approximately 40 to 700 mm, preferably 110 to 160 mm, and a width of approximately 900 to 3500 mm, preferably 1000 to 1650 mm, particularly preferably 1150 to 1350 mm.
  • the casting machine can be designed as a thin-slab caster, which is configured to cast slabs with a thickness of 40 to 200 mm, preferably 110 to 160 mm.
  • the casting machine may be designed as a “conventional” continuous casting device, which is equipped to cast slabs with a thickness of 100 to 700 mm, preferably 200 to 400 mm.
  • the material is cooled in the usual way, for example by primary and secondary cooling.
  • the plant further comprises a first temperature conditioning device which is connected to the casting machine in the transport line and is designed to subject the slabs cast by the casting machine to a first temperature conditioning.
  • the plant further comprises a first rolling stand group which is connected to the first temperature conditioning device in the transport line and is designed to transform the slabs conditioned by the first temperature conditioning device into corresponding metal strips by rolling.
  • the first rolling stand group comprises one or more rolling stands, preferably in a four-high design with two work rolls and two backup rolls each, and can be operated in reversing or tandem mode. In reversing mode, forming preferably takes place in 1 to 11 steps, while in non-reversing mode, forming preferably takes place in 1 to 4 steps.
  • the first rolling stand group preferably forms a roughing train.
  • the first temperature conditioning device is configured to heat the slabs to a first temperature Ti during the first temperature conditioning, which leads to partial austenitization of the slabs, and to subsequently keep the slabs at a second temperature T2 or above for a compensation time ti.
  • the combined casting and rolling plant can be used to produce a high-quality GO precursor material.
  • the first temperature Ti is greater than 1160 °C, preferably greater than 1220 °C, particularly preferably greater than 1240 °C.
  • the second temperature T2 is greater than 1200 °C, particularly preferably greater than 1220 °C.
  • the equilibration time ti is preferably more than 30 s, particularly preferably more than 60 s.
  • the first temperature conditioning device is configured to condition the slabs, after heating to the first temperature Ti (i.e., during or after holding), to a temperature below the first temperature Ti during the first temperature conditioning, while avoiding a drop below a third temperature T3.
  • the third temperature T3 is defined by the austenite content falling below the third temperature T3 upon hypothetical further cooling.
  • the third temperature T3 is preferably at least 1100°C, and is particularly preferably greater than 1150°C.
  • the first temperature conditioning device is configured to lower the temperature of the slabs to the third temperature T3, so that the austenite volume fraction increases from approximately 20% at the first temperature T1 to up to 40%.
  • the increase in the austenite volume fraction from 20% to 40% defines the third temperature T3.
  • the first temperature conditioning device is configured such that the temperature of the slabs drops by a maximum of 100 K while passing through the first temperature conditioning device, whereby the temperature of the slabs drops only slightly, which does not lead to the precipitation of AIN since there are no nuclei for this.
  • the plant preferably comprises a second temperature conditioning device, which is connected to the first rolling stand group in the transport line and is configured to condition the slabs formed into corresponding metal strips by the first rolling stand group to a fourth temperature T4 as part of a second temperature conditioning process and to hold them for a second equalization time t2, wherein the second equalization time t2 is preferably between 30 s and 5 min.
  • the second temperature conditioning brings the metal strips to a suitable temperature for further processing.
  • the metal strips are brought to a temperature T4 in the second temperature conditioning device, which ensures the removal of the finished-rolled product from a finishing train with a suitable finishing rolling temperature T5.
  • the plant comprises a second rolling stand group which is connected to the second temperature conditioning device in the transport line and is designed to form the metal strips conditioned by the second temperature conditioning device by rolling, preferably to a thickness of 1 mm to 5 mm, more preferably 1.5 mm to 3 mm, particularly preferably 2 mm to 2.5 mm.
  • the second rolling stand group preferably forms a finishing mill.
  • the stands in the roughing, middle, and/or finishing mills of hot rolling mills are designed as 4-high or four-high stands.
  • other stand designs such as duo-high or 6-high/six-high, etc., can also be used.
  • the forming by the first rolling stand group and the second rolling stand group can take place both decoupled and coupled or tandem operation of the roughing mill and the finishing mill.
  • the system comprises a third temperature conditioning device, which is connected to the second rolling stand group in the transport line and is configured to subject the metal strips rolled by the second rolling stand group to a third temperature conditioning.
  • the third temperature conditioning device is designed as a cooling device. This can, for example, be a laminar cooling system, an intensive cooling system, a direct compact cooling system, or a combination thereof.
  • the system comprises a winding device configured to wind the metal strips into a coil, wherein the third temperature conditioning device is preferably configured to bring the metal strips to a sixth temperature Te in the range from 500°C to 750°C, particularly preferably 580°C to 630°C, for winding by the winding device.
  • the first temperature conditioning device and/or the second temperature conditioning device comprises an electrically heated and/or gas-heated tunnel furnace and/or roller conveyor and/or a walking beam furnace and/or a walking hearth furnace and/or a rotary hearth furnace and/or a pusher furnace and/or an induction heater or a combination of two or more of said heating devices.
  • a particularly suitable combination for the first temperature conditioning device comprises an inductor and a tunnel furnace 22, preferably in this order. This variant is well suited for setting the desired temperature curve.
  • the material is heated to Ti in the inductor (for example, 1160 °C, 1220 °C, 1240 °C) and transferred to the tunnel furnace, whose furnace chamber temperature is below Ti.
  • the strand temperature slowly drops towards or to T3.
  • the austenite volume fraction increases. Because AlN can only be dissolved in the austenite and reprecipitated at these temperatures, this increase in the austenite fraction promotes precipitation.
  • a control device is preferably provided that communicates with the various assemblies, actuators, sensors, and the like.
  • the control device is signal-connected to the components of the system to be controlled or regulated and/or read, thus in particular to the casting machine, the first temperature conditioning device, the first rolling stand group, the second temperature conditioning device, the second rolling stand group, the third temperature conditioning device, and the winding device.
  • the control device can receive and/or transmit signals (control signals, data, etc.), whereby both one-way and two-way signal transmission fall under the term "communication" in this context.
  • the control device does not necessarily have to be implemented by a central computing device or electronic control system; decentralized and/or multi-level systems, control networks, and cloud systems are also possible. and the like.
  • the controller can also be an integral component of a higher-level system controller or communicate with such a controller.
  • the control device can also communicate with lower-level system controllers, i.e., controllers assigned to the corresponding devices.
  • the above-mentioned object is further achieved by a method for producing hot-rolled metal strips as a precursor or intermediate product for grain-oriented electrical steel strip, the method comprising: producing slabs from a silicon-containing steel melt by means of a casting machine; subsequently subjecting the slabs cast by the casting machine to a first temperature conditioning in a first temperature conditioning device; subsequently forming the slabs conditioned by the first temperature conditioning device into corresponding metal strips by rolling in a first rolling stand group; wherein, within the scope of the first temperature conditioning, the slabs are heated to a first temperature Ti, which leads to partial austenitization of the slabs, and subsequently the slabs are held at a second temperature T2 or above for a compensation time ti.
  • the silicon-containing steel melt used to produce the GO precursor material preferably has the following composition in terms of mass fractions (mass%):
  • Si 2.50 to 4.00%, preferably 2.90 to 3.50%, particularly preferably 3.10 to 3.35%;
  • Mn 0.16 to 0.35%, preferably 0.20 to 0.30%, particularly preferably 0.22 to 0.26%;
  • Cu 0.10 to 0.30%, preferably 0.15 to 0.25%, particularly preferably 0.20 to 0.22%;
  • AI 0.02 to 0.04%, preferably 0.022 to 0.035%, particularly preferably 0.026 to 0.031%;
  • Sn 0.05 to 0.15%, preferably 0.055 to 0.100%, particularly preferably 0.060 to 0.065%;
  • Al/N > 4, preferably > 3, particularly preferably > 2;
  • Figure 1 schematically shows a plant for producing hot-rolled metal strips as a precursor or intermediate product for grain-oriented electrical steel according to an embodiment, comprising a casting machine, several temperature conditioning devices and several rolling stand groups;
  • Figure 2 shows a possible temperature profile of the cast strand in the plant of Figure 1;
  • the liquid, silicon-containing steel melt to be cast is fed into a mold of the casting machine 10, for example, from a pouring ladle.
  • the mold molds the molten metal into the desired slab shape, while the slab gradually solidifies from the outside inward due to the cooled mold walls.
  • the mold is preferably a mold made of copper plates or plates of a copper alloy, which may be coated. If the casting thickness or the casting radius so require, the copper plates may have a funnel-shaped contour and/or be curved in a transport direction corresponding to the casting radius of a strand guide.
  • the strand guide can be segmented, for example, with two or more similar curved segments that form a bending area of the strand guide.
  • the cast strand is actively or passively cooled as part of a secondary cooling process, for example by spraying water, whereby it gradually solidifies from the outside in.
  • rollers Adjacent to the bending area of the casting machine 10 is a straightening area, where the cast strand is brought into horizontal alignment.
  • rollers are provided for guiding and transporting the cast strand.
  • One or more of the rollers are drive rollers and drive the cast strand in the transport direction; other rollers serve to guide and align the cast strand.
  • the rollers form a means for driving and bending the cast strand.
  • the system 1 preferably further comprises a separating device arranged in the transport line behind the straightening area of the casting machine 10.
  • the separating device serves to cut or divide the cast strand into slabs. The cut is made along the slab thickness.
  • the "slab thickness" refers to the dimension of the slab that is perpendicular to the longitudinal extent and perpendicular to the width of the slab.
  • the separating device configured to cut the cast strand during conveyance, i.e., during the movement of the cast strand along the transport line.
  • the cutting device is a shear, in particular a pendulum shear.
  • the shear is configured such that the transport movement of the cast strand is tracked during the cutting process, and one or more cutting blades cut the strand in a single movement perpendicular to the cast strand.
  • the first temperature conditioning device 20 is configured to carry out a temperature control of the cast strand in several phases:
  • a second phase the temperature of the cast strand is kept above a temperature T2 which is characterized in that it favors the dissolution of AlN into Al and N, with T2 preferably > 1200 °C, particularly preferably T2 > 1220 °C, for a compensation time of ti > 30 seconds, preferably ti > 60 seconds. T2 does not have to be constant over the compensation time ti, but should always fulfill the above-mentioned condition.
  • the cast strand is temperature-conditioned in the first temperature conditioning device 20 to a temperature possibly below Ti, while avoiding a temperature below T3, which is characterized by the fact that the austenite content would drop below T3 upon further cooling.
  • T3 is preferably at least 1100 °C, particularly preferably T3 > 1150 °C.
  • the first temperature conditioning device 20 is followed by a roughing mill RM in the form of a first rolling stand group 30 for hot forming the cast strand (step 5), comprising one or more, for example, four, rolling stands 31.
  • the first rolling stand group 30 can be designed as reversing or non-reversing. In the reversing case, forming preferably takes place in 1 to 11 steps, while in the non-reversing case, forming preferably takes place in 1 to 4 steps.
  • the temperature T4 is also maintained for a second time t2 (step 9), preferably git: t2 > 30 s and t2 ⁇ 5 min.
  • the first and/or second temperature conditioning devices 20, 40 can be implemented as electrically heated tunnel kilns or roller conveyors; gas-heated tunnel kilns or roller conveyors; walking beam, walking hearth, rotary hearth, or pusher furnaces; induction heating or a combination of two or more of these devices, for example, an (electrically) heated tunnel kiln/roller conveyor before the inductor or an inductor before and after the (electrically) heated tunnel kiln/roller conveyor.
  • the second temperature conditioning device 40 is followed by a finishing mill FM in the form of a second rolling stand group 50 for forming the cast strand (step 8).
  • the second rolling stand group 50 preferably comprises 3 to 7 rolling stands 51, which form the rolled stock in non- reversibly carried out forming steps to a thickness of, for example, 1 mm to 5 mm, preferably 1.5 mm to 3 mm, particularly preferably 2 mm to 2.5 mm.
  • the rolling stands 51 of the second rolling stand group 50 are preferably each designed as a four-high version, each with two work rolls forming the roll gap and two backup rolls.
  • the hot strip is removed from the finishing train FM (step 9) at the above-mentioned finishing rolling temperature Ts of approximately Ts > 900 °C, preferably Ts > 920 °C, particularly preferably Ts > 940 °C.
  • a third temperature conditioning of the hot strip takes place in a third temperature conditioning device 60 (step 10), which is designed in particular as a cooling device, particularly preferably as a laminar cooling section.
  • the hot strip is wound into a coil by a winding device 70, approximately at a temperature Ts in the range of 500 °C to 750 °C, preferably 580 °C to 630 °C.
  • the temperature profile to be set in the first temperature conditioning device 20 has an effect that can be described as “inherent partial inhibition.” This achieves a partial dissolution of the AIN particles in the strand that were formed during solidification, within which Austenite regions at temperatures Ti > 1200 °C. During subsequent hot forming during throughput in the first rolling stand group 30, particularly during the first hot forming step, these AlN particles are precipitated again, but this time in a particularly finely dispersed form, i.e., in a very small size and in particularly large numbers.
  • the temperature of the strand, slab, or thin slab drops by a maximum of 100 K, but this does not lead to the precipitation of AlN, as there are no nuclei for it.
  • “Parasitic grain growth” refers to the undesirable coarsening of individual grains (especially in the middle layers), which would be detrimental to the final magnetic properties.
  • APL annealing and pickling line
  • RCM reversing cold mill
  • DCL decarburization and coating line
  • BAF batch annealing furnace
  • FCL flattening and coating line
  • a control device 100 For controlling and/or regulating the casting/rolling process described above, a control device 100 is provided, which communicates with the various assemblies 10 to 70, actuators, sensors, and the like.
  • the control device 100 is signal-connected to the components of the system 1 to be controlled or regulated and/or read out, thus in particular to the casting machine 10, the first temperature conditioning device 20, the first roll stand group 30, the second temperature conditioning device 40, the second roll stand group 50, the third temperature conditioning device 60, and the winding device 70.
  • Communication between the control device 100 and the system components to be controlled or regulated and/or read can be wired or wireless, digital or analog.
  • the control device 100 can receive and/or transmit signals (control signals, data, etc.) accordingly, whereby both signal transport in one direction and in both directions falls under the term "communication" in this context.
  • the control device 100 does not necessarily have to be implemented by a central computing device or electronic control system; rather, decentralized and/or multi-level systems, control networks, cloud systems, and the like are included.
  • the controller can also be an integral part of a higher-level system control system or communicate with such a system.
  • the control device 100 can also communicate with lower-level system controls, i.e. communicate with the controls assigned to the corresponding devices.
  • the silicon-containing steel melt used to produce the GO precursor material preferably has the following composition in terms of mass fractions (mass%):
  • Si 2.50 to 4.00%, preferably 2.90 to 3.50%, particularly preferably 3.10 to 3.35%;
  • Mn 0.16 to 0.35%, preferably 0.20 to 0.30%, particularly preferably 0.22 to 0.26%;
  • Cu 0.10 to 0.30%, preferably 0.15 to 0.25%, particularly preferably 0.20 to 0.22%;
  • Sn 0.05 to 0.15%, preferably 0.055 to 0.100%, particularly preferably 0.060 to 0.065%;
  • N ⁇ 100 ppm, preferably 50 to 90 ppm, particularly preferably 70 to 80 ppm;
  • Al/N > 4, preferably > 3, particularly preferably > 2;

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention concerne une installation (1) et un procédé de production de bandes métalliques laminées à chaud en tant que produit préliminaire ou intermédiaire pour bande d'acier électrique à grains orientés, l'installation (1) comprenant : une machine de coulée (10), qui est conçue pour produire des brames à partir d'une masse fondue d'acier contenant du silicium et les transporter dans une ligne de transport; un premier dispositif de conditionnement thermique (20), qui est adjacent à la machine de coulée (10) dans la ligne de transport et est conçu pour soumettre les brames coulées par la machine de coulée (10) à un premier conditionnement thermique; un premier groupe de cages de laminage (30), qui est adjacent au premier dispositif de conditionnement thermique (20) et est conçu pour utiliser un laminage pour former les brames conditionnées par le premier dispositif de conditionnement thermique (20) en bandes métalliques correspondantes; le premier dispositif de conditionnement thermique (20) étant conçu pour chauffer les brames, au cours du premier conditionnement thermique, à une première température (T1) qui conduit à une austénitisation partielle des brames, et pour maintenir ensuite les brames à ou au-dessus d'une deuxième température (T2) pendant un temps d'égalisation (t1).
PCT/EP2024/077420 2023-10-13 2024-09-30 Production de bandes métalliques laminées à chaud en tant que produit préliminaire ou intermédiaire pour bande d'acier électrique à grains orientés WO2025078189A1 (fr)

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DE102023210083.5 2023-10-13
DE102023210083.5A DE102023210083A1 (de) 2023-10-13 2023-10-13 Herstellung von warmgewalzten Metallbändern als Vor- oder Zwischenprodukt für kornorientiertes Elektroband

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003064069A1 (fr) 2002-01-31 2003-08-07 Sms Demag Akgtiengesellschaft Procede et dispositif de production de feuillard lamine a chaud a partir d'aciers austenitiques inoxydables
WO2008000396A1 (fr) 2006-06-26 2008-01-03 Sms Demag Ag Procédé et dispositif de production de matériau de laminage de feuillards à chaud en acier au silicium à base de brames fines
US20080216985A1 (en) * 2005-08-03 2008-09-11 Klaus Gunther Method for Producing Grain Oriented Magnetic Steel Strip
US20100275667A1 (en) * 2007-09-13 2010-11-04 Seidel Juergen Compact, flexible csp installation for continuous, semi-continuous and batch operation
US20160111190A1 (en) * 2014-10-15 2016-04-21 Sms Siemag Ag Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process
US20160108488A1 (en) * 2014-10-15 2016-04-21 Sms Siemag Ag Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process
DE102020214427A1 (de) 2020-04-01 2021-10-07 Sms Group Gmbh Verfahren zum Herstellen eines Warmbandes mittels einer Gießwalzanlage
DE102020209299A1 (de) 2020-07-23 2022-01-27 Sms Group Gmbh Verfahren zum Herstellen von Stahlband

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* Cited by examiner, † Cited by third party
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WO2003064069A1 (fr) 2002-01-31 2003-08-07 Sms Demag Akgtiengesellschaft Procede et dispositif de production de feuillard lamine a chaud a partir d'aciers austenitiques inoxydables
US20050072499A1 (en) * 2002-01-31 2005-04-07 Ingo Schuster Method and installation for producing a hot rolled strip from austenitic rust-resistant steels
US20080216985A1 (en) * 2005-08-03 2008-09-11 Klaus Gunther Method for Producing Grain Oriented Magnetic Steel Strip
WO2008000396A1 (fr) 2006-06-26 2008-01-03 Sms Demag Ag Procédé et dispositif de production de matériau de laminage de feuillards à chaud en acier au silicium à base de brames fines
US20090301157A1 (en) * 2006-06-26 2009-12-10 Ingo Schuster Method of and apparatus for hot rolling a thin silicon-steel workpiece into sheet steel
US20100275667A1 (en) * 2007-09-13 2010-11-04 Seidel Juergen Compact, flexible csp installation for continuous, semi-continuous and batch operation
US20160111190A1 (en) * 2014-10-15 2016-04-21 Sms Siemag Ag Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process
US20160108488A1 (en) * 2014-10-15 2016-04-21 Sms Siemag Ag Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process
DE102020214427A1 (de) 2020-04-01 2021-10-07 Sms Group Gmbh Verfahren zum Herstellen eines Warmbandes mittels einer Gießwalzanlage
DE102020209299A1 (de) 2020-07-23 2022-01-27 Sms Group Gmbh Verfahren zum Herstellen von Stahlband
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