EP4200449A1 - Verfahren zur herstellung eines elektrobands - Google Patents

Verfahren zur herstellung eines elektrobands

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Publication number
EP4200449A1
EP4200449A1 EP21769633.5A EP21769633A EP4200449A1 EP 4200449 A1 EP4200449 A1 EP 4200449A1 EP 21769633 A EP21769633 A EP 21769633A EP 4200449 A1 EP4200449 A1 EP 4200449A1
Authority
EP
European Patent Office
Prior art keywords
steel sheet
area
heating
cooling
annealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21769633.5A
Other languages
German (de)
English (en)
French (fr)
Inventor
Christian DORFBAUER
Marius KREUZEDER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanoneal Technologies GmbH
Original Assignee
Nanoneal Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanoneal Technologies GmbH filed Critical Nanoneal Technologies GmbH
Publication of EP4200449A1 publication Critical patent/EP4200449A1/de
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0012—Rolls; Roll arrangements
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • 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
    • C21D8/1233—Cold 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
    • 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
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • 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
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • 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
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • 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
    • C21D9/005—Furnaces in which the charge is moving up or down
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • C21D9/562—Details
    • C21D9/564—Tension control
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C21D9/66—Tower-type furnaces
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B2001/221—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 plates, strips, bands or sheets of indefinite length by cold-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
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation

Definitions

  • the invention relates to a method for processing a silicon-containing, cold-rolled steel sheet with a thermal treatment for producing a non-grain-oriented electrical strip according to the preamble of claim 1.
  • Steel sheets made of iron-silicon alloys with a high silicon content, in particular with a silicon content of more than 1.5% by weight, are of great interest for a large number of electrotechnical or electromagnetic applications.
  • Such steel sheets usually referred to as electrical sheet or electrical strip, have a higher saturation magnetization in combination with higher values of the electrical resistance and therefore offer the advantage of lower magnetic losses, especially in applications at higher frequencies.
  • the melts are first cast into so-called slabs after the steel alloys have been melted.
  • So-called hot strip is first produced from this starting material in a hot-rolling process. If the primary material cools down in the meantime, it is necessary to reheat and descale the surfaces to remove any remaining oxide layers. This is usually done with a chemical surface treatment carried out as pickling.
  • the hot strips obtained are then rolled into a cold strip. Finally, the strips are heat treated in annealing furnaces, with the annealing process achieving the formation of a crystalline structure that promotes the desired properties.
  • the object of the invention is to create a method for processing a silicon-containing, cold-rolled steel sheet that enables the production of a non-grain-oriented electrical strip with improved magnetic properties and with a significantly improved surface quality.
  • This object of the invention is achieved by a method for processing a silicon-containing, cold-rolled steel sheet with a thermal treatment to produce a non-grain-oriented electrical steel strip, the steel sheet containing between 1.5% and 6% by weight of silicon, and the steel sheet in is provided in a strip-like state and is moved during the thermal treatment in a continuous process through an annealing plant having a heating area, a holding area and a cooling area, the steel sheet being moved in the annealing plant in a vertical main conveying direction.
  • the steel sheet in the annealing plant is transported from a furnace inlet area, which is arranged in a lower end area of the annealing plant, via deflection rollers, which are arranged in an upper end area of the annealing plant, to a furnace outlet area, which is located in the lower end area of the Annealing system is arranged, is moved.
  • the steel sheet in the heating area is heated to a maximum temperature in a range from 920° to 1150° C., preferably from 950° C. to 1100° C., during a heating-up phase.
  • the steel sheet is heated up in the heating phase in a first section at a heating rate of 100 °C/s to 1000 °C/s and in a second section at a heating rate of 3 °C/s to 50 °C/s s is performed.
  • the steel sheet is held at the maximum temperature in the holding area in a holding phase lasting from 5 s to 45 s, preferably lasting from 10 s to 30 s.
  • the further development of the procedure is advantageous, in which the steel sheet is cooled to a first intermediate temperature of 200 °C to 1050 °C, preferably from 400 °C to 900 °C, after the holding phase, between the holding area and the deflection rollers, wherein the cooling is carried out at a cooling rate of 3°C/s to 30°C/s, preferably at a cooling rate of 5°C/s to 15°C/s.
  • a preferred heat treatment of the steel sheet provides that the steel sheet is then cooled to the deflection rollers in a first section from the first intermediate temperature to a second intermediate temperature in a range from 200° C. to 1050° C., preferably from 400° C. to 900° C is performed, the cooling being carried out at a cooling rate of 3°C/s to 30°C/s, preferably at a cooling rate of 5°C/s to 15°C/s.
  • the steel sheet is then further cooled from the second intermediate temperature in a second section during the movement to the furnace outlet region, the cooling being carried out at a cooling rate of 3 °C/s to 60 °C/s, preferably with a cooling rate of 15 °C/s to 35 °C/s.
  • the procedure according to which an inert gas atmosphere consisting predominantly of hydrogen with a proportion of hydrogen of more than 99% (vol%) is provided in the annealing plant, has the advantage that renewed formation of oxide layers on the surface can be avoided.
  • the protective gas atmosphere contains a very small proportion of water vapor, in particular a proportion corresponding to a dew point of -70° C. to -45° C.
  • the method is particularly suitable for sheet steel with a thickness of 0.05 mm to 0.5 mm.
  • the application of the method is particularly suitable for the treatment of electrical strips made of alloyed steels with alloying components in the proportions by weight of Si: 1.5% to 6%, preferably 2% to 4%, Al: 0.05% to 2%, C : ⁇ 0.01%, preferably ⁇ 0.005%, Mn: 0.05% to 5%, P: 0.01% to 0.2%, S: ⁇ 0.01%, preferably ⁇ 0.005%, and N: ⁇ 0.01%, preferably ⁇ 0.005%.
  • FIG. 1 shows an apparatus for processing a siliceous, cold-rolled steel sheet
  • FIG. 2 shows an annealing installation for the thermal treatment of the steel sheet according to FIG. 1;
  • Fig. 3 is a graph showing the temperature history of the steel sheet during the thermal treatment
  • FIG. 5 shows a further alternative exemplary embodiment of the glow system.
  • the steel sheet 1 shows a device 1 in the form of a production line for processing a silicon-containing, cold-rolled steel sheet 2 with a thermal treatment for producing a non-grain-oriented electrical strip.
  • the steel sheet 2, which is subjected to a thermal treatment in the device 1, is a cold-rolled steel strip with a thickness in a range from 0.05 mm to 0.5 mm.
  • the steel sheet 2 is provided in a strip-like state and, during processing, is moved in a continuous process through stations of the production line arranged one behind the other.
  • the primary processing station of the device 1 it includes an annealing system 3 for the thermal treatment of the steel sheet 2.
  • the device 1 comprises a preparation station 4 for preparing the steel sheet 2 supplied as an endless strip.
  • the preparation station 4 shown in FIG. 1 as only one component represents several individual processing stations or preparatory work such as unwinding the cold-rolled steel sheet 2 from corresponding Rolls, the welding together of the consecutive ends of several rolls to form an endless strip and a preparatory cleaning or degreasing of the surfaces.
  • a belt storage device 5 arranged downstream ensures compensation or adaptation of different movement speeds of the steel sheet 2 between the preparation station 4 and subsequent processing stations.
  • the cold-rolled sheet steel 2 is then subjected to a thermal treatment in the annealing system 3, wherein--as will be described below with reference to the illustrations in FIG.
  • the thermal treatment of the steel sheet 2 in the annealing plant 3 changes its crystalline structure in such a way that an improvement in the magnetic properties of the electrical strip that is finally obtained is achieved.
  • the vertical conveying direction of the steel sheet 2 during this thermal treatment makes it possible to avoid contact or unrolling of otherwise necessary conveying rollers on the steel sheet 2, particularly at high temperatures of the steel sheet 2, as a result of which these electrical strips have a high degree of uniformity in their surfaces.
  • In order to influence the crystalline structure of the steel sheet 2 during the thermal treatment in the annealing system 3 it passes through a heating area, a holding area and a cooling area, each with a special, adapted temperature profile over time.
  • the processing method in the device 1 includes a control device 6, by which both the temperatures in the areas of the annealing system 3 and the speed of movement of the steel sheet 2 are controlled to achieve the corresponding temperature profiles over time.
  • the control of the processing method in the device 1 is also based on information from subsequent control devices for monitoring the quality of the steel sheet 2.
  • the steel sheet 2 After leaving the annealing system 3, the steel sheet 2 passes through a measuring station 7 in which the magnetic properties of the steel sheet 2 after the heat treatment be detected. It is so in the case of deviations from the desired properties of the steel sheet 2 possible, automatically by the control device 6 on the machining process - to take corrective influence - especially in the annealing system 3.
  • this can also be equipped to measure other properties, such as geometric parameters of the processed steel sheet 2.
  • the device 1 for carrying out the processing method also includes a coating station 8 for applying and then drying a protective layer on the steel sheet 2. Subsequently, a coating measuring station 9 is provided, in which the thickness and uniformity of the coating on the steel sheet 2 applied protective layer is measured and thus controlled. Finally, a further strip store 10 and a post-processing station 11 connected thereto are provided on the output side. The latter primarily serves to cut the steel sheet 2 running through the device 1 as an endless strip into sub-strips and to wind them up onto individual rolls.
  • FIG. 2 shows the glow system 3 in a simplified schematic representation of its components.
  • This plant for the thermal treatment of the steel sheet 2 comprises, in the order of the direction of movement of the steel sheet 2, a furnace entry area 12, a rapid heating area 13 and a vertical furnace 14. In the uppermost end area of the vertical furnace 14, this is followed by a holding area or a holding zone 15. Further in the ascending strand of the steel sheet 2 follows a first cooling zone 16 and in an upper end region of the annealing system 3 there is a deflection zone 17. This has deflection rollers 18 over which the steel sheet 2 is guided and thus from the ascending strand into the descending strand of the annealing system 3 is transferred. The deflection area 17 located in the upper end area of the annealing system 3 is followed by a second cooling zone 19, a third cooling zone 20 and finally a furnace exit area 21.
  • the steel sheet 2 is moved in the annealing system 3 in an inert gas atmosphere consisting predominantly of hydrogen.
  • the protective gas atmosphere has a hydrogen content of more than 99%. Since the steel sheet 2 is continuously moved through the interior of the annealing system 3 in a continuous process, it is particularly important that the transitions of the steel sheet 2 as it enters through the furnace entry area 12 and leaving the annealing system 3 through the furnace exit area 21 are designed to be as gas-tight as possible. Accordingly, the furnace entry area 12 and the furnace exit area 21 each have special gas seals. Optionally, seals can also be provided at the transition between the rapid heating area 13 and the vertical furnace 14 and between the vertical furnace 14 and the first cooling zone 16 .
  • the protective gas atmosphere in the annealing system 3 which consists of more than 99% hydrogen, it is also provided that only as little residual water vapor as possible is contained.
  • the protective gas atmosphere preferably contains water vapor with a proportion corresponding to a dew point of -70.degree. C. to -45.degree.
  • This protective gas atmosphere with more than 99% hydrogen and the particularly low water vapor content is maintained at least in the volume extending from the furnace inlet area 12 via the heating area, the holding zone 15 and the deflection area 17 .
  • a protective gas atmosphere with a less high level of purity can also be provided.
  • the rapid heating area 13 and the vertical furnace 14 together form the heating area of the annealing system 3. This is followed by the holding area in the holding zone 15 and finally the cooling area, which consists of the first cooling zone 16, the deflection area 17 and the second and third cooling zone 19. 20 in the descending leg of the annealing plant 3.
  • the thermal energy supplied by the rapid heating area 13 and the vertical furnace 14 during its upward movement into the steel sheet 2 finally heats it to a maximum temperature in a range of 920 °C to 1,150 °C.
  • the steel sheet 2 is subjected to a tensile load corresponding to the weight of the steel sheet 2 hanging further down.
  • the dimensions of the rapid heating area 13, the vertical furnace 14 and the furnace inlet area 12 are dimensioned such that a height 24 of an area of the steel sheet 2 with its maximum temperature is so great that the tensile stress prevailing in the steel sheet 2 is less than 5 MPa.
  • the height 24 is preferably selected such that the tensile stress is less than 4 MPa.
  • the height 24 of the area with the maximum temperature in the glow system 3 corresponds to about half the total height of the glow system 3.
  • This can be achieved, for example, by generating torques of different magnitudes, which act on the conveyor rollers for moving the steel sheet 2 .
  • the respectively prevailing tensile stress in cross sections of the region of the steel sheet 2 with the maximum temperature does not exceed a value of 5 MPa.
  • the prevailing tensile stress is maintained at a value less than 4 MPa.
  • the development of good magnetic properties can be additionally promoted by the treatment with such an alternating load during the thermal treatment. In particular, non-uniformities in the magnetic properties (magnetic anisotropy) during the annealing process in the longitudinal and transverse direction of the steel strip 2 can be avoided.
  • FIG. 3 shows a diagram of the time course of the temperature of the steel sheet 2 during its thermal treatment.
  • a heating-up phase 25, a holding phase 26 and a cooling-down phase 27 can be distinguished.
  • Heating takes place with a very steeply rising temperature curve in the first section at a heating rate of 100° C./s to 600° C./s.
  • This rapid heating of the steel sheet 2 is achieved by the rapid heating area 13 (Fig. 2).
  • the steel sheet is further heated up to a maximum temperature at a heating rate of 10 °C/s to 50 °C/s.
  • This second part of the heating phase is effected in the vertical oven 14 .
  • the steel sheet 2 is preferably heated up to a maximum temperature in a range from 950.degree. C. to 1,100.degree.
  • the temperature in the holding area or holding zone 15 is then kept at the maximum temperature for the duration of the holding phase 26 .
  • the length or duration of the holding phase 26 is in a range from 5 seconds to 45 seconds, preferably in a range from 10 seconds to 30 seconds.
  • the temperature of the steel sheet 2 then goes into the cooling phase 27.
  • the steel sheet 2 is initially cooled from the maximum temperature to a first intermediate temperature with a value in a range from 200 °C to 1100 °C, preferably 400 °C to 900 °C, corresponding to the movement of the steel sheet 2 in the first cooling zone 16 between the holding zone 15 and the deflection area 17.
  • Cooling to the first intermediate temperature takes place comparatively slowly at a cooling rate of 3° C./s to 20° C./s, preferably at a cooling rate of 5° C./s to 15° C./s.
  • the temperature in the deflection area 17 is kept approximately constant at the first intermediate temperature.
  • the cooling in the second cooling zone 19 is continued until a second intermediate temperature in a range of 600° C. to 700° C. is reached.
  • the speed of the cooling takes place at a cooling rate of 3° C./s to 20° C./s, preferably at a cooling rate of 5° C./s to 15° C./s.
  • the steel sheet 2 is cooled from the second intermediate temperature to about room temperature, the cooling taking place at a cooling rate of 10 °C/s to 50 °C/s is carried out.
  • the temperature profile during cooling i.e. at the transition from the maximum temperature via the first intermediate temperature in the deflection area 17 to the second intermediate temperature and finally to the final cooling to room temperature, at least two different variants can be distinguished.
  • Example 1 After the holding area in the holding zone 15, the temperature of the steel sheet 2 is lowered in the first cooling zone 16 to a value of the first intermediate temperature of approximately 800°C. With this value of the first intermediate temperature, the steel sheet 2 is guided over the deflection rollers 18 in the deflection area 17 and the cooling is then continued in the second cooling zone 19 with an initially lower cooling rate. In the second cooling zone 19, the temperature is reduced at a cooling rate of approximately 10° C./s. Only when the steel sheet 2 has reached a value of the second intermediate temperature in a range from 600° C. to 700° C. does cooling continue in the third cooling zone 20 at a cooling rate of typically 35° C./s.
  • Example 2 In this variant, a value of the first intermediate temperature of the steel sheet 2 of approximately 600° C. is already reached in the first cooling zone 16 . After the steel sheet 2 has been deflected in the deflection area 17 on the deflection rollers 18, further cooling can then be continued at the high cooling rate of typically 35° C./s—in the course of the second cooling zone 19 as the third cooling zone 20.
  • FIG. 4 shows an alternative exemplary embodiment of the annealing system 3 for the thermal treatment of the steel sheet 2 according to FIG. That is, in comparison to the embodiment according to the representation in FIG. 2, no rapid heating area 13 is included and the heating of the steel sheet 2 to the maximum temperature takes place solely with the aid of the vertical furnace 14.
  • the vertical furnace 14 can be a gas-powered or—preferably—an electric heating system . In this annealing system 3, the steel sheet 2 is heated at a heating rate of between 5° C./s and 100° C./s.
  • FIG. 5 A further embodiment variant of an alternative glow system 3 is shown in FIG. 5 in a schematically simplified manner.
  • this annealing system 3 corresponds to the example according to FIG. 4, in that only the vertical furnace 14 is also provided for this purpose.
  • a coating station 8 follows the third cooling zone 20 in the descending line (FIG. 1). This is designed for a vertical conveying direction of the steel sheet 2 and includes a coating zone 22 and a drying zone 23.
  • the integration of the coating station 8 in the descending line of the annealing system 3 achieves the overall advantage of a reduced space requirement for the entire system.
  • the described method of processing the silicon-containing, cold-rolled steel sheet 2 with the thermal treatment in the device 1 advantageously enables the production of a non-grain-oriented electrical strip with a high degree of homogeneity in its crystalline structure, improved magnetic properties and a significantly improved surface quality.
  • the application of the method is particularly suitable for the treatment of electrical strips made of alloyed steels with alloy components in the proportions by weight of Si: 1.5% to 6%, preferably 2% to 4%, Al: 0.05% to 2%, C: ⁇ 0.01%, preferably ⁇ 0.005%, Mn: 0.05% to 5%, P: 0.01% to 0.2%, S: ⁇ 0.01%, preferably ⁇ 0.005%, and N: ⁇ 0.01%, preferably ⁇ 0.005%.
  • the risk of oxide growth can occur during the processing of the steel sheet 2.
  • solution on the deflection roller even with the high proportions of Si, Al and Mn in the strip with high deflection temperatures can be avoided.
  • periodic belt indentations and thus system downtimes can be avoided.
  • the throughput of the device 1 can be increased by higher deflection temperatures of the strip.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP21769633.5A 2020-08-20 2021-08-18 Verfahren zur herstellung eines elektrobands Pending EP4200449A1 (de)

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ATA50703/2020A AT524148B1 (de) 2020-08-20 2020-08-20 Verfahren zur Herstellung eines Elektrobands
PCT/AT2021/060288 WO2022036382A1 (de) 2020-08-20 2021-08-18 Verfahren zur herstellung eines elektrobands

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EP (1) EP4200449A1 (zh)
KR (1) KR20230052277A (zh)
CN (1) CN115943221A (zh)
AT (1) AT524148B1 (zh)
BR (1) BR112023002354A2 (zh)
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JPS61119620A (ja) * 1984-11-14 1986-06-06 Kawasaki Steel Corp たて型連続焼鈍炉によるけい素鋼帯の焼鈍方法
JPH075986B2 (ja) * 1988-03-11 1995-01-25 日本鋼管株式会社 低磁場での磁束密度の優れた無方向性電磁鋼板の製造方法
JPH075987B2 (ja) * 1988-03-11 1995-01-25 日本鋼管株式会社 低磁場での磁束密度の優れた無方向性電磁鋼板の製造方法
JP3575167B2 (ja) * 1996-05-15 2004-10-13 Ｊｆｅスチール株式会社 低磁場特性に優れた無方向性電磁鋼板の製造方法
JP5655955B2 (ja) * 2012-06-13 2015-01-21 Ｊｆｅスチール株式会社 鋼帯の連続焼鈍方法、鋼帯の連続焼鈍装置、溶融亜鉛めっき鋼帯の製造方法及び溶融亜鉛めっき鋼帯の製造装置
JP5884748B2 (ja) * 2013-02-25 2016-03-15 Ｊｆｅスチール株式会社 鋼帯の連続焼鈍装置および連続溶融亜鉛めっき装置
CN107245647B (zh) * 2017-06-01 2018-10-16 东北大学 一种基于薄带连铸制备发达{100}面织构无取向硅钢薄带的方法
CN111471941B (zh) * 2020-04-27 2022-02-01 马鞍山钢铁股份有限公司 一种屈服强度600MPa级新能源汽车驱动电机转子用高强无取向硅钢及其制造方法

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CN115943221A (zh) 2023-04-07
TW202223107A (zh) 2022-06-16
KR20230052277A (ko) 2023-04-19
WO2022036382A1 (de) 2022-02-24
US20230304115A1 (en) 2023-09-28
AT524148A1 (de) 2022-03-15
BR112023002354A2 (pt) 2023-03-21

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