EP1420072A1 - Procédé de fabrication de bandes laminées à chaud pour la production de bandes d'acier électrique à grains non-orientés , bande laminée à chaud et tôle d'acier électrique à grains non-orientés ainsi obtenues - Google Patents

Procédé de fabrication de bandes laminées à chaud pour la production de bandes d'acier électrique à grains non-orientés , bande laminée à chaud et tôle d'acier électrique à grains non-orientés ainsi obtenues Download PDF

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Publication number
EP1420072A1
EP1420072A1 EP03024299A EP03024299A EP1420072A1 EP 1420072 A1 EP1420072 A1 EP 1420072A1 EP 03024299 A EP03024299 A EP 03024299A EP 03024299 A EP03024299 A EP 03024299A EP 1420072 A1 EP1420072 A1 EP 1420072A1
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EP
European Patent Office
Prior art keywords
hot strip
electrical steel
strip
oriented electrical
hot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03024299A
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German (de)
English (en)
Other versions
EP1420072B8 (fr
EP1420072B1 (fr
Inventor
Brigitte Dr.-Ing. Hammer
Karl Ernst Dipl.-Ing. Friedrich
Wolfgang Dr.-Ing. Rasim
Karl Dipl.-Phys. Telger
Olaf Dipl.-Ing. Dr. Fischer
Carl-Dieter Dr.-Ing. Dipl.-Wirtsch.-I Wuppermann
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
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Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Publication of EP1420072A1 publication Critical patent/EP1420072A1/fr
Application granted granted Critical
Publication of EP1420072B1 publication Critical patent/EP1420072B1/fr
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    • 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
    • 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
    • C21D8/1211—Rapid solidification; Thin strip casting
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for producing a for processing into non-grain-oriented electrical steel certain hot bands.
  • the invention also relates to a for the production of non grain oriented electrical steel certain hot strip and a hot strip not produced from it grain-oriented electrical steel.
  • non-grain oriented electrical sheet are here under DIN EN 10106 ("final annealed Electrical sheet ”) and DIN EN 10165 (“ not finally annealed Electrical sheet ”) falling products understood.
  • DIN EN 10106 final annealed Electrical sheet
  • DIN EN 10165 not finally annealed Electrical sheet
  • more anisotropic varieties are included as long as they are not considered grain-oriented electrical sheets.
  • J 2500 hereinafter denotes the magnetic polarization at a magnetic field strength of 2500 A / m and a frequency of 50 Hz.
  • P 1.5 is the magnetic loss at a polarization of 1.5 T and a frequency of 50 Hz Roger that.
  • CSP plants have been set up for this purpose Service.
  • Casting and rolling plants The steel becomes a continuous device shed stripped from the "in-line” thin slab be divided, which then also "in-line” to hot strip be hot rolled.
  • the operation of casting and rolling plants gained experience and the advantages of "in-line” Casting rolls are carried out, for example, in W. Bald et al "Innovative technology for band production", steel and Eisen 119 (1999) No. 3, pages 77-85, or C. Hendricks et al "Commissioning and first results of the Casting mill from Thyssen Krupp Stahl AG ", steel and iron 120 (2000) No. 2, pages 61-68.
  • the invention was based on the object of a hot strip create, which is in a special way for generation of high quality non grain oriented electrical steel. It should also be a non-grain oriented Electrical sheet to be developed, which compared to that from the Known prior art electrical sheets superior has magnetic properties. Finally one should Procedures are specified with which a cost-effective Intermediate product for a non-grain-oriented electrical sheet or - can produce tape that compared to the prior art has further improved magnetic properties.
  • this task is performed by a Hot strip for the production of non-grain oriented Electrical steel loosened, the hot strip being made of steel (in mass%) C: ⁇ 0.010%, Si: 1.0 - 1.5%, Al: ⁇ 0.4%, with Si + 2Al ⁇ 1.85%, Mn: ⁇ 0.5%, Cu: ⁇ 0.05%, Ti: ⁇ 0.01%, P: ⁇ 0.1%, Sn: ⁇ 0.15%, Sb: ⁇ 0.15%, optional S, O and N, the sum of the contents of these elements ⁇ Is 0.02%, and the balance iron and unavoidable Contamination, is generated and in the hot strip
  • Extensive excretion is such that the existing excretions have an average particle size of have at least 300 nm.
  • the size of the particles should should preferably be distributed so that among the existing excretions the proportion of excretions with particle sizes from 50 to 190 nm on small traces is reduced.
  • the particle size of the Most of the excretions are more than 300
  • the invention is based on the knowledge that significantly improved magnetic properties Electrical sheets with silicon and aluminum contents of the Set order of magnitude selected according to the invention let go when the formation of excretions is controlled will keep the number of fine excretions to a minimum is reduced. Surprisingly, it has been shown that one on the formation of as few and with the largest possible excretions Particle sizes of more than 300 nm directed Procedural management of the structural and excretion state of the hot strip according to the invention is designed so that this favorable excretion characteristic of the hot strip about the production of the finished electrical sheet usually further steps up to Completion of the product is inherited with the result that a End product with excellent magnetic properties is obtained.
  • the structure of the finished non-grain-oriented electrical steel is due to the set according to the invention Elimination state of the hot strip over the entire
  • the strip thickness is particularly homogeneous as there are no smaller ones Excretions are more present, which is the emergence such a homogeneous structure in further processing of the hot strip according to the invention could interfere. Accordingly, the good values of polarization and the magnetic losses of the invention Electrical sheet is also particularly evenly distributed.
  • non-grain-oriented electrical sheet With regard to the non-grain-oriented electrical sheet, the above-mentioned object is achieved by a cold-rolled and finally annealed non-grain-oriented electrical sheet or sheet, which is produced from a hot strip obtained according to the invention and has a final thickness of up to 0.75 mm and polarization values J 2500 which are suitable for a Electrical steel 0.50 mm thick at 50 Hz and magnetic loss P 1.5 from 4.4 W / kg to 5 W / kg at least 1.65 T and at 50 Hz and magnetic loss P 1.5 of less 4.4 W / kg be at least 1.67 T.
  • Both configurations of the method according to the invention correspond to one another.
  • the treatment time is determined as a function of the oven temperature
  • the relevant calculation formula has been changed so that the required oven temperature T E can be determined based on a given treatment time.
  • the practical procedure has been taken into account, in which an oven temperature is usually known, according to which the duration of the treatment depends.
  • the second approach offers the possibility of optimizing the overall sequence of the method according to the invention by specifying a treatment duration that is suitable for the process flow and on the basis of which the furnace temperature must be based.
  • the thickness of the course of the implementation of the Thin slab produced according to the inventive method variant is typically 35 to 100 mm.
  • the hot strip produced in the working steps stands out according to the invention in that in the finished hot strip An extensive elimination has taken place in such a way that the Excretions present in the finished hot strip on average have a particle size of at least 300 nm.
  • the Particle sizes should be distributed so that under the existing excretions the proportion of Excretions with particle sizes from 50 to 190 nm minor traces is reduced. This should include the particle size the excretions mostly more than 300 nm be.
  • the invention is based on the knowledge that significantly improved magnetic properties Electrical sheets with silicon and aluminum contents of the Set order of magnitude selected according to the invention leave if these electrical sheets on a caster generated and a suitable one in the course of processing Compensatory heat treatment is carried out.
  • This Heat treatment has one within narrow limits to follow precisely specified temperature or timing. In this way, the formation of excretions in the hot strip produced according to the invention controlled so that the Number of fine excretions reduced to a minimum becomes.
  • the structure of the finished, non-grain-oriented electrical steel is due to the set according to the invention Elimination state of the hot strip over the entire
  • the strip thickness is particularly homogeneous as there are no smaller ones Excretions are more present, which is the emergence such a homogeneous structure in further processing of the hot strip according to the invention could interfere. Accordingly, the good values of polarization and the magnetic losses of the invention Electrical sheet is also particularly evenly distributed.
  • the invention takes advantage of consistent use of a casting and rolling line Possibilities one in terms of workload and the cost optimized approach by starting with the casting of the thin slab the individual steps of the Hot strip production according to the invention "in-line" immediately be carried out consecutively. Is essential the equalizing heat treatment of the thin slabs given a certain duration Temperature window and at a given temperature in one defined time window.
  • the corridor, within which the effects used according to the invention occur, is on a small temperature or time span limited by the in the invention given formulas for determining the Heat treatment temperature or duration included Express deviations ⁇ T in the furnace target temperature.
  • Hot strip excretions can be found in known Wise electron microscopic or other determine suitable detection and evaluation methods. So the excretion state can be determined with, for example a transmission electron microscope (TEM) Carbon extraction marks with a lower detection limit of 5 nm and in the case of precipitations with a diameter of 30 nm with a personal scanning electron microscope (PSEM) by image analysis using the mass contrast.
  • TEM transmission electron microscope
  • PSEM personal scanning electron microscope
  • the hot strip produced according to the invention is not too grain-oriented electrical sheet finished, so can the hot strip is first subjected to hot strip cooling become. This additional annealing of the hot strip causes an improvement in texture. However, it should always be carried out so that there is none with regard to the desired improvement of the magnetic properties undesirable change in excretions comes.
  • the hot strip after rolling in the Finished relay at a reel temperature of less than 600 ° C, ideally in particular less than 530 ° C, coiled.
  • the reeling at these temperatures leads to the alloys concerned to a solidified Hot strip condition, so that the result improved magnetic properties can be achieved.
  • the reel temperature at least 720 ° C, ideally at least 750 ° C. If such a high reel temperature is maintained, a Hot strip annealing entirely or at least in part be saved.
  • the hot strip is already in the coil softened, which determine its properties Characteristics such as grain size, texture and excretions, positive to be influenced. This is how annealed hot strips can be used particularly good magnetic and technological Create properties.
  • Hot strip annealing Before or after, if applicable Hot strip annealing is usually pickled. Subsequent to pickling or hot strip annealing the hot strip is then cold rolled, this cold rolling in known way with two or more stages intermediate annealing can be performed. On cold rolling usually includes one Final heat treatment, which is carried out so that there is no austenite formation.
  • the thin slab samples I-P1, I-P2, I-P3, II-P1 and II-P2 in turn immediately afterwards entered a hot rolling mill, in which they started from a hot rolling start temperature W AT and at a hot rolling temperature W ET have been hot rolled to the final hot strip thickness.
  • the hot-rolled strips which were hot-rolled from the thin slab samples I-P1, I-P2, I-P3, II-P1 and II-P2, were then split in the hot-rolled state.
  • the first half of the hot strips obtained in this way has been aged at a temperature T H in order to simulate reeling at higher temperatures T H.
  • the second half of the hot strips was directly on Air cooled to room temperature at RT To simulate the reel variant with the temperature is coiled below 500 ° C. After the outsourcing they are the hot strip halves that have been removed from the pickling and in conventional way to an electrical steel EI-1, EI-2 and EI-3 and EII-1 and EII-2 with a thickness of 0.50 mm been cold rolled.
  • the cold rolled electrical strips EI-1, EI-2 and EI-3 and EII-1 and EII-2 are all in one Continuous furnace in an equally well-known way of shot annealing been subjected.
  • Table II shows the processing of thin slab samples I-P1, I-P2, I-P3, II-P1 and II-P2 into electrical strips EI-1, EI-2 and EI-3 as well as EII-1 and EII- 2 operating parameters set.
  • T VO temperature before the equalization furnace
  • W AT hot rolling start temperature
  • W ET hot rolling end temperature
  • T H aging temperature
  • P 1.0 is the loss of magnetization with a polarization of 1.0 T
  • P 1.5 the loss of magnetization with a polarization of 1.5 T
  • P 1.7 the loss of magnetization with a polarization of 1.7 T. referred to a frequency of 50 Hz.
  • the magnetic reversal loss P 1.5 shows the magnetic polarization values J 2500, the mixed value A M and, determined in the longitudinal direction for the electrical strips EI-1, EI-2 and EI-3 as well as EII-1 and EII-2 compared to the longitudinal value A L of the magnetic polarization J 2500 , which could be determined for non-grain-oriented sheets of comparable composition produced conventionally without hot strip annealing.
  • Diagram 3 shows that for electrical strips EI-1 and EI-3 resulting cumulative frequency distribution SHV shown.
  • the optimal range is Sum frequency distribution also by line G circumscribed.
  • Diagram 4 shows the area within which the compensating heat treatment according to the invention is carried out.
  • the upper horizontal line G o defines the maximum permissible temperature of 1160 ° C and the lower horizontal line G u the minimum required temperature of 1040 ° C.
  • the two lines L shown in dashed lines and running from the top left to the bottom right, limit the period of time within which the heat treatment according to the invention can be carried out at a given temperature.
  • the optimal duration of treatment is illustrated by the solid line L opt running in the middle between the lines L.
  • the temperature of the oven is generally predetermined and a certain interval of the required Duration of the heat treatment taking into account the respective cycle time of the casting and rolling system used be determined.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Soft Magnetic Materials (AREA)
EP20030024299 2002-11-14 2003-10-24 Procédé de fabrication de bandes laminées à chaud pour la production de bandes d'acier électrique à grains non-orientés et tôle d'acier électrique à grains non-orientés Expired - Fee Related EP1420072B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002153339 DE10253339B3 (de) 2002-11-14 2002-11-14 Verfahren zum Herstellen eines für die Verarbeitung zu nicht kornorientiertem Elektroband bestimmten Warmbands, Warmband und daraus hergestelltes nicht kornorientiertes Elektroblech
DE10253339 2002-11-14

Publications (3)

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EP1420072A1 true EP1420072A1 (fr) 2004-05-19
EP1420072B1 EP1420072B1 (fr) 2007-01-03
EP1420072B8 EP1420072B8 (fr) 2007-02-28

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EP20030024299 Expired - Fee Related EP1420072B8 (fr) 2002-11-14 2003-10-24 Procédé de fabrication de bandes laminées à chaud pour la production de bandes d'acier électrique à grains non-orientés et tôle d'acier électrique à grains non-orientés

Country Status (3)

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EP (1) EP1420072B8 (fr)
DE (2) DE10253339B3 (fr)
ES (1) ES2280667T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106435358A (zh) * 2016-10-11 2017-02-22 东北大学 一种新能源汽车驱动电机用高强度无取向硅钢的制造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357800A1 (fr) * 1988-03-04 1990-03-14 Nkk Corporation Procede de production de feuilles d'acier au silicium non oriente presentant d'excellentes proprietes magnetiques
EP0367831A1 (fr) * 1988-03-07 1990-05-16 Nkk Corporation Procede de production de feuilles d'acier electrique non oriente
EP0655509A1 (fr) * 1993-09-29 1995-05-31 Kawasaki Steel Corporation Tôle en acier au silicium à grain non-orienté et procédé de fabrication
JPH0967656A (ja) * 1995-08-29 1997-03-11 Nkk Corp 低磁場特性に優れた無方向性電磁鋼板
DE19807122A1 (de) * 1998-02-20 1999-09-09 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
JP2002220643A (ja) * 2001-01-29 2002-08-09 Nippon Steel Corp 加工性の良好な低鉄損無方向性電磁鋼板及びその製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10015691C1 (de) * 2000-03-16 2001-07-26 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von nichtkornorientiertem Elektroblech

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0357800A1 (fr) * 1988-03-04 1990-03-14 Nkk Corporation Procede de production de feuilles d'acier au silicium non oriente presentant d'excellentes proprietes magnetiques
EP0367831A1 (fr) * 1988-03-07 1990-05-16 Nkk Corporation Procede de production de feuilles d'acier electrique non oriente
EP0655509A1 (fr) * 1993-09-29 1995-05-31 Kawasaki Steel Corporation Tôle en acier au silicium à grain non-orienté et procédé de fabrication
JPH0967656A (ja) * 1995-08-29 1997-03-11 Nkk Corp 低磁場特性に優れた無方向性電磁鋼板
DE19807122A1 (de) * 1998-02-20 1999-09-09 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
JP2002220643A (ja) * 2001-01-29 2002-08-09 Nippon Steel Corp 加工性の良好な低鉄損無方向性電磁鋼板及びその製造方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
HENDRICKS C ET AL: "INBETRIEBNAHME UND ERSTE ERGEBNISSE DER GIESSWALZANLAGE DER THYSSEN KRUPP STAHL AG COMMISSIONING AND FIRST RESULTS OF THE CASTING ROLLING PLANT OF THYSSEN KRUPP STAHL AG", STAHL UND EISEN, VERLAG STAHLEISEN GMBH. DUSSELDORF, DE, vol. 120, no. 2, 15 February 2000 (2000-02-15), pages 61 - 68, XP000933035, ISSN: 0340-4803 *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07 31 July 1997 (1997-07-31) *
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 12 12 December 2002 (2002-12-12) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106435358A (zh) * 2016-10-11 2017-02-22 东北大学 一种新能源汽车驱动电机用高强度无取向硅钢的制造方法
CN106435358B (zh) * 2016-10-11 2018-05-04 东北大学 一种新能源汽车驱动电机用高强度无取向硅钢的制造方法

Also Published As

Publication number Publication date
ES2280667T3 (es) 2007-09-16
EP1420072B8 (fr) 2007-02-28
DE50306174D1 (de) 2007-02-15
DE10253339B3 (de) 2004-07-01
EP1420072B1 (fr) 2007-01-03

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