EP1420072B1 - 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 ainsi obtenue - Google Patents

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 ainsi obtenue Download PDF

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EP1420072B1
EP1420072B1 EP20030024299 EP03024299A EP1420072B1 EP 1420072 B1 EP1420072 B1 EP 1420072B1 EP 20030024299 EP20030024299 EP 20030024299 EP 03024299 A EP03024299 A EP 03024299A EP 1420072 B1 EP1420072 B1 EP 1420072B1
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Prior art keywords
strip
electrical steel
oriented electrical
hot
heat treatment
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German (de)
English (en)
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EP1420072A1 (fr
EP1420072B8 (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
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel AG
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1205—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving particular fabrication steps or treatments of ingots or slabs
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
    • C21D8/1272—Final recrystallisation annealing

Definitions

  • the invention relates to a method for producing a hot strip intended for processing into non-grain oriented electrical steel. Moreover, the invention relates to a non-grain oriented electrical steel.
  • non-grain oriented electrical steel sheet is understood here to mean products falling under DIN EN 10106 ("final annealed electrical steel sheet”) and DIN EN 10165 (“non-final annealed electrical steel sheet”).
  • DIN EN 10106 final annealed electrical steel sheet
  • DIN EN 10165 non-final annealed electrical steel sheet
  • more anisotropic varieties are included, as long as they are not considered grain-oriented electrical sheets.
  • the terms "steel strip for electromagnetic purposes” and “steel sheet for electromagnetic purposes” and “electrical steel” and “electrical steel” are used interchangeably below.
  • J 2500 denotes the magnetic polarization at a magnetic field strength of 2500 A / m and a frequency of 50 Hz.
  • P 1.5 the core loss is at a polarization of 1.5 T and a frequency of 50 Hz Understood.
  • CSP plants have been set up.
  • cast-rolling plants the steel is poured into a continuously drawn strand from which "in-line” thin slabs are separated, which are then hot-rolled in-line into hot-rolled strip.
  • the experiences gained in the operation of cast-rolling plants and the advantages of "in-line” casting rolling are described, for example, in W. Bald et al., "Innovative Technology for ribbon production ", Stahl and Eisen 119 (1999) No. 3, pages 77-85, or C. Hendricks et al.” Commissioning and initial results of the casting rolling mill of Thyssen Krupp Stahl AG ", Stahl and Eisen 120 (2000) No. 2, Pages 61-68, has been documented.
  • EP 0 367 831 A1 In contrast, in the conventional production of electrical steel by slab casting, as described in EP 0 367 831 A1, a suitably composite steel is cast into slabs, then pre-rolled and then finish hot rolled. In the case of the process described in EP 0 367 831 A1, a minimum deformation of 10%, in particular 20%, and between the rough rolling and the finish rolling, a break of at least 30 seconds at a surface temperature of more than 950 ° C is observed during the rough rolling to finished hot-rolled hot strip to form AlN precipitates whose size is above 500 nm. In compliance with these conditions, according to EP 0 367 831 A1, hot-rolled hot strips can be produced which are suitable for producing cold-rolled electrical steel sheets having particularly good electromagnetic properties. However, the procedure known from EP 0 367 831 A1 is not suitable for being implemented on modern cast rolling mills.
  • the invention had the object of specifying a method by means of which it is possible to inexpensively produce a precursor for a non-grain-oriented electrical sheet or strip which, compared to the prior art, has further improved magnetic properties.
  • a non-grain-oriented electrical sheet was to be developed, which compared to that from the State of the art known electrical sheets regularly has superior magnetic properties.
  • Both embodiments of the method according to the invention correspond to each other. While in the first case the Treatment duration is determined in dependence on the oven temperature, in the second case, the relevant calculation formula has been changed so that the required oven temperature T E can be determined based on a predetermined treatment period. In this way, on the one hand, the practical procedure has been taken into account, in which usually a furnace temperature is known, after which the duration of treatment depends. On the other hand, the second approach makes it possible to optimize the overall sequence of the method according to the invention in terms of time by specifying a treatment duration suitable for the process flow, according to which the oven temperature has to be determined.
  • a hot strip produced according to the invention is made of a steel with (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%, optionally S, O and N, wherein the sum of the contents of these elements is ⁇ 0.02%, and the remainder being iron and unavoidable impurities.
  • the hot strip a substantial elimination is carried out such that the existing precipitates have an average particle size of at least 300 nm.
  • the size of the particles should preferably be distributed in such a way that, among the excretions present, the proportion of precipitates having particle sizes of 50 to 190 nm is reduced to small traces.
  • the particle size of the precipitates should be for the most part more than 300 nm.
  • the invention is based on the recognition that significantly improved magnetic properties can be set in electrical sheets with silicon and aluminum contents of the order of magnitude selected according to the invention, if the formation of precipitates is controlled so that the number of fine precipitates is reduced to a minimum .
  • the microstructure and precipitation state of the hot strip according to the invention is such that this favorable precipitation characteristic of the hot strip exceeds that for Production of the finished electric sheet usually further steps taken until the completion of the product inherited with the result that an end product with excellent magnetic properties is obtained.
  • the microstructure of the finished non-grain-oriented electrical tape is particularly homogeneous due to the invention set precipitation state of the hot strip over the entire strip thickness, since no smaller precipitates are more, which could disturb the formation of such a homogeneous structure in the further processing of the hot strip according to the invention. Accordingly, the good values of the polarization and of the magnetic losses of inventive electric sheet are also particularly evenly distributed.
  • non-grain oriented electrical steel sheet With regard to the non-grain oriented electrical steel sheet, the above-mentioned object is accordingly achieved by cold rolled and finally annealed non-grain oriented electrical steel strip or sheet dissolved, which - of a steel containing (in% by 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%, optionally S, O and N, the sum of the contents of these elements being ⁇ 0.02%, the remainder being iron and unavoidable impurities, - with a final thickness ⁇ 0.75 mm, and with polarization values J 2500 , for a 0.50 mm thick electrical steel strip at 50 Hz and magnetic reversal losses P 1.5 from 4.4 W / kg to 5 W
  • Inventive electrical sheet having these structural properties has significantly improved electromagnetic properties over conventionally produced non-grain oriented electrical sheet of the same composition.
  • the thickness of the thin slab produced in the course of carrying out the method variant according to the invention is typically 35 to 100 mm.
  • a hot strip produced by following the working steps prescribed by the invention is characterized according to the invention in that a high degree of precipitation has taken place in the finished hot strip such that the precipitates present in the finished hot strip have on average a particle size of at least 300 nm.
  • the particle sizes should be distributed so that among the existing precipitates, the proportion of precipitates with particle sizes of 50 to 190 nm is reduced to small traces.
  • the particle size of the precipitates should be for the most part more than 300 nm.
  • the invention is based on the finding that significantly improved magnetic properties can be set in the case of electrical steel sheets with silicon and aluminum contents of the order of magnitude selected according to the invention, if these electrical steel sheets are used on a cast roll mill produced and in the course of processing a suitable compensation heat treatment is performed.
  • This heat treatment has to follow within narrow limits of a precisely predetermined temperature or time management. In this way, the formation of precipitates in the hot strip produced according to the invention is controlled so that the number of fine precipitates is reduced to a minimum.
  • the microstructure of the finished non-oriented grain electrical tape is particularly homogeneous due to the inventively adjusted precipitation state of the hot strip over the entire strip thickness, since no smaller precipitates are more, which could interfere with the formation of such a homogeneous structure in the further processing of the hot strip according to the invention. Accordingly, the good values of the polarization and of the magnetic losses of inventive electric sheet are also particularly evenly distributed.
  • the invention utilizes the possibilities offered by the consistent use of a casting and rolling mill of a procedure optimized with regard to the workload and cost, by carrying out the individual steps of the hot-rolled strip production according to the invention "in-line" immediately after the casting of the thin slab. It is essential here the compensation heat treatment of the thin slabs, which is to be carried out for a given duration in a specific temperature window and at a predetermined temperature in a defined time window.
  • the corridor within which the effects used according to the invention occur is limited to a small temperature or time span, which is expressed by the deviations .DELTA.T of the furnace temperature contained in the formulas according to the invention for determining the heat treatment temperature or duration.
  • the present invention aimed at as less as possible and, if present coarse precipitates at the same time largely suppression of because of their negative influence on the magnetic properties particularly undesirable precipitates with particle sizes in the range of 50 nm safely reached to 190 nm.
  • the number, size and distribution of the precipitates present in the hot strip according to the invention can be determined in a known manner by electron microscopy or by means of other suitable detection and evaluation methods. So lets the excretion state For example, with a transmission electron microscope (TEM) on carbon pull-offs at a lower detection limit of 5 nm as well as for precipitations from a diameter of 30 nm with a Personal Scanning Electron Microscope (PSEM) by image analysis on the mass contrast determine. For the determination of the chemical composition of the precipitates, for example, the EDX analysis is available.
  • TEM transmission electron microscope
  • PSEM Personal Scanning Electron Microscope
  • the hot strip produced according to the invention is finished to a non-grain oriented electrical steel sheet, the hot strip can be first subjected to a hot strip annealing. This additional annealing of the hot strip results in an improvement of the texture. However, it should always be carried out so that there is no undesirable change in the precipitates in view of the desired improvement in the magnetic properties.
  • the coiler temperature is at least 720 ° C, ideally at least 750 ° C.
  • a hot strip annealing can be completely or at least substantially saved.
  • the Hot strip is already softened in the coil, whereby the properties determining its properties, such as grain size, texture and precipitations, are positively influenced. This makes it possible to produce annealed hot strips with particularly good magnetic and technological properties.
  • the hot strip Before or after the optional hot strip annealing, the hot strip is usually pickled. Subsequent to the pickling or hot strip annealing, the hot strip is then cold rolled, this cold rolling can be carried out in a known manner two or more stages with intermediate annealing. The cold rolling is usually followed by a final heat treatment, which is carried out so that there is no Austenit Struktur.
  • the thin slab samples I-P1, I-P2, I-P3, II-P1 and II-P2 have in turn immediately after run into a hot rolling mill, in the they have been finish hot rolled starting from a hot rolling start temperature W AT and at a hot rolling end temperature W ET to hot strip thickness.
  • the first half of the hot-rolled strip thus obtained has been aged at a temperature T H in order to simulate a coiling at higher temperatures T H.
  • the second half of the hot-rolled strips were cooled directly in air to room temperature RT in order to simulate a reel variant in which the reeling is carried out at temperatures below 500 ° C.
  • the hot strip halves subjected to aging were pickled and cold rolled in a conventional manner into an electrical steel EI-1, EI-2 and EI-3 and EII-1 and EII-2 having a thickness of 0.50 mm.
  • Table II shows the results of the processing of thin slab samples I-P1, I-P2, I-P3, II-P1 and II-P2 into the EI-1, EI-2 and EI-3 and EII-1 and EII 2 each set operating parameters specified.
  • T VO temperature before the equalization furnace
  • W AT hot rolling start temperature
  • W ET hot rolling end temperature
  • T H aging temperature
  • Diagram 4 shows the range within which the compensation heat treatment according to the invention is carried out.
  • the upper horizontal straight line G o the maximum allowable temperature of 1160 ° C and by the lower horizontally extending straight line G u the minimum required temperature of 1040 ° C set.
  • the two dashed lines, from top left to bottom right lines L limit the period of time within which the heat treatment according to the invention can be carried out at a given temperature.
  • the optimum duration of treatment is illustrated by the solid line L opt running centrally between the lines L.
  • the temperature of the furnace is specified and a certain interval of the required duration of the compensation heat treatment, taking into account the respective cycle time of the casting rolling mill used.

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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)

Claims (8)

  1. Procédé de préparation d'un feuillard à chaud destiné à la production de bandes d'acier électrique à grains non orientés, dans lequel on réalise les étapes suivantes :
    - fusion d'une masse d'acier, qui contient (en % en masse) C : ≤ 0,010% Si : 1,0-1,5% Al : < 0,4%, avec Si+2Al ≤ 1,85%, Mn : ≤ 0,5% Cu : < 0,05% Ti : < 0,01% P : < 0,1% Sn : < 0,15% Sb : < 0,15%
    S, O et N au choix, où la somme des teneurs en ces éléments est ≤ 0,02%, et le reste est du fer et les impuretés inévitables,
    - coulée de la masse fondue en un brame fin,
    - directement après, traitement d'équilibration thermique du brame fin à une température de four TE se situant dans l'intervalle allant de 1040°C à 1160°C, où la durée de traitement tH chaque fois maintenue est calculée de la manière suivante, en minutes : t H min = - 1 / 0 , 01873 * ln ⁢ T E - 870 , 934 ⁢ °C + ΔT / 528 , 83 ⁢ °C ,
    Figure imgb0010
     avec -40°C ≤ ΔT ≤ 40°C,
    - laminage thermique suivant directement le traitement d'équilibration thermique, et
    - bobinage du feuillard à chaud.
  2. Procédé de préparation d'un feuillard à chaud destiné au traitement en bande d'acier électrique à grains non orientés, dans lequel on réalise les étapes suivantes :
    - fusion d'une masse d'acier, qui contient (en % en masse) C : ≤ 0,010% Si : 1,0-1,5% Al : < 0,4%, avec Si+2Al ≤ 1,85%, Mn : ≤ 0,5% Cu : < 0,05% Ti : < 0,01% P : < 0,1% Sn : < 0,15% Sb : < 0,15%
    S, O et N au choix, où la somme des teneurs en ces éléments est ≤ 0,02%, et le reste est du fer et les impuretés inévitables,
    - coulée de la masse fondue en un brame fin,
    - directement après, traitement d'équilibration thermique du brame fin pendant une durée de traitement tH se situant dans l'intervalle allant de 25 à 70 minutes, où la température de four TE chaque fois maintenue du traitement d'équilibration thermique est calculée de la manière suivante, en °C : T E °C = 528 , 83 * exp - 0 , 01873 * t H + 870 , 934 - ΔT ,
    Figure imgb0011
     avec -40°C ≤ ΔT ≤ 40°C,
    - laminage thermique suivant directement le traitement d'équilibration thermique, et
    - bobinage du feuillard à chaud.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'épaisseur des brames fins se situe dans l'intervalle allant de 35 à 100 mm.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température de bobinage est inférieure à 600°C.
  5. Procédé la revendication 4, caractérisé en ce que la température de bobinage est inférieure à 530°C.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la température de bobinage est supérieure à 720°C.
  7. Procédé la revendication 6, caractérisé en ce que la température de bobinage est supérieure à 750°C.
  8. Bande ou tôle d'acier électrique, à grains non orientés, laminé à froid et avec recuit final,
    - avec un acier qui contient (en % en masse) C : ≤ 0,010% Si : 1,0-1,5% Al : < 0,4%, avec Si+2Al ≤ 1,85%, Mn : ≤ 0,5% Cu : < 0,05% Ti : < 0,01% P : < 0,1% Sn : < 0,15% Sb : < 0,15%
    S, O et N au choix, où la somme des teneurs en ces éléments est ≤ 0,02%, et le reste est du fer et les impuretés inévitables,
    - avec une épaisseur finale ≤ 0,75 mm,
    - et avec des valeurs de polarisation J2500, qui s'élèvent pour un bande d'acier électrique de 0,50 mm d'épaisseur, à 50 Hz et des pertes par inversion magnétique P1,5 de 4,4 W/kg à 5 W/kg, à au moins 1,65 T et à 50 Hz et des pertes par inversion magnétique P1,5 d'au moins 4,4 W/kg, à au moins 1,67 T,
    - en ce que le diamètre moyen des grains DK de la bande d'acier électrique finie se situe dans l'intervalle allant de 50 µm à 80 µm avec une valeur médiane de 35 à 65 µm, et
    - les conditions suivantes sont remplies pour 90% des grains dans la distribution de la fréquence cumulée en pour-cent : 1 , 3 * D K - 0   30 ⁢ μm < SHV < 1 , 3 * D K + 15 ⁢ μm .
    Figure imgb0012
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 - Lifetime EP1420072B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10253339 2002-11-14
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

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

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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

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JPH01225723A (ja) * 1988-03-04 1989-09-08 Nkk Corp 磁気特性の優れた無方向性珪素鋼板の製造方法
JPH01225726A (ja) * 1988-03-07 1989-09-08 Nkk Corp 無方向性電磁鋼板の製造方法
KR100316896B1 (ko) * 1993-09-29 2002-02-19 에모또 간지 철손이낮은무방향성규소강판및그제조방법
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
DE19807122C2 (de) * 1998-02-20 2000-03-23 Thyssenkrupp Stahl Ag Verfahren zur Herstellung von nichtkornorientiertem Elektroblech
DE10015691C1 (de) * 2000-03-16 2001-07-26 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von nichtkornorientiertem Elektroblech
JP4987190B2 (ja) * 2001-01-29 2012-07-25 新日本製鐵株式会社 加工性が良好で、加工して歪取焼鈍した後の鉄損が低い無方向性電磁鋼板の製造方法

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ES2280667T3 (es) 2007-09-16
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DE10253339B3 (de) 2004-07-01
EP1420072B8 (fr) 2007-02-28

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