EP1440173B1 - Hot-rolled steel strip provided for producing non grain-oriented electrical sheet, and method for the production thereof - Google Patents

Hot-rolled steel strip provided for producing non grain-oriented electrical sheet, and method for the production thereof Download PDF

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Publication number
EP1440173B1
EP1440173B1 EP02779503A EP02779503A EP1440173B1 EP 1440173 B1 EP1440173 B1 EP 1440173B1 EP 02779503 A EP02779503 A EP 02779503A EP 02779503 A EP02779503 A EP 02779503A EP 1440173 B1 EP1440173 B1 EP 1440173B1
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EP
European Patent Office
Prior art keywords
hot
rolling
strip
intensity
hot strip
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EP02779503A
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German (de)
French (fr)
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EP1440173A1 (en
Inventor
Karl Ernst Friedrich
Jürgen Schneider
Rudolf Kawalla
Wolfgang A. Rasim
Carl-Dieter Wuppermann
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • 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
    • C22C38/002—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
    • C22C38/06—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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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

Definitions

  • the invention relates to a for the production of Electrical sheet metal hot-rolled steel strip and a Process for its preparation.
  • non-grain oriented electrical sheet is in this context a steel sheet or a Steel band understood, which is independent of his Texture below those mentioned in DIN 46 400 part 1 or 4 Sheet metal falls and its loss anisotropy in DIN 46 400 part 1 limits.
  • the terms “tin” and “band” are synonymous here used.
  • Hot strip thicknesses of ⁇ 1.5 mm can be achieved, see eg. B. JP 2001 123225 A2.
  • the invention was based on the object, a cost producible hot strip with partially solidified Microstructure with a thickness of at most 1.8 mm too realize which is due to these characteristics in a special way for the production of high quality Electric sheets is suitable.
  • the invention is based on the recognition that, when choosing a suitable preparation path, a hot strip can be made available, which already has a microstructure in the hot rolled state, which can be produced only by cold rolling at high degrees of deformation in conventional manufacturing.
  • assembled and procured hot strip at a strip thickness of at most 1.8 mm has a partially solidified microstructure.
  • This microstructure is characterized by high intensities of the ⁇ -fiber in the range of angles up to 60 ° for specific layers, ie in an angular range in which in conventional hot strips of comparable composition usually no appreciable intensities for these layers can be determined.
  • Characteristic are the high intensities of the specific layers (112) ⁇ 110> and (111) ⁇ 110>, wherein for the ratios of the intensities I 112 of the layer (112) ⁇ 110> to the intensity I 001 of the layer (001) ⁇ 110 > a value> 0.4 or the intensity I 111 of the layer (111) ⁇ 110> to the intensity I 001 of the layer (001) ⁇ 110> gives a value> 0.2.
  • the hot strip according to the invention can be characterized in excellent Process to cold-rolled NO electrical steel whose final thickness is typically 0.35 mm to 0.75 mm, in particular 0.2 mm, 0.35 mm, 0.50 mm or 0.65 mm.
  • Conventional hot strips differ from according to the invention characterized in that noticeable in them Intensities only in the range of up to 25 ° (-30 °) occur while for the components (112) ⁇ 110> and (111) ⁇ 110> no higher intensities detectable are.
  • the conventional hot tapes lies typically an intensity maximum of the ⁇ -fiber structure at 0 °, from which the intensity with increasing angle decreases. This intensity distribution
  • the ⁇ -fiber corresponds to a solidified structure.
  • First by the cold rolling process is in such steel strips a softening of the structure by a Recrystallization in the subsequent annealing reached. For this purpose, overall degrees of deformation of more than 65% are required, on the one hand a certain minimum thickness cold-rolled hot strip and on the other hand a considerable rolling work during the cold forming of the strip provide.
  • hot strip according to the invention is so procure that the intensities of the component (112) ⁇ 110> and the intensities of the layer (111) ⁇ 110> high are.
  • hot strip according to the invention has a special low final thickness.
  • the invention Hot strip creates so much more favorable conditions for the subsequent processing than this conventional Hot strips can afford. That's how it works Hot strip according to the invention starting from its low Thickness of at most 1.8 mm at minimized Total transformation to a non-grain oriented Cold-forming electrical sheet, its properties at least equal to the properties conventional produced NO-electric sheets is.
  • the orientation distribution function describes the relative position of the crystal coordinate system and the sample coordinate system.
  • the orientation distribution function assigns an orientation density or intensity to each point in space. Since a representation of the orientation distribution function is very complicated and not very clear, a simplified description with the aid of fibers is chosen.
  • the relevant fibers for steels are: a-fiber, ⁇ -fiber, ⁇ -fiber, ⁇ -fiber, ⁇ -fiber, ⁇ -fiber, ⁇ -fiber
  • the a fiber considered here is the ⁇ 110> direction parallel to the rolling direction; she passes between the layers (001) ⁇ 110> and (110) ⁇ 110>.
  • a particularly advantageous for further processing Entfest TrentsSullivan has inventive hot strip then, if its strip thickness is at most 1.2 mm.
  • the ratio I 112 / I 001 > 0.75 formed from the intensity I 112 of the layer (112) ⁇ 110> to the intensity I 001 of the layer (001) ⁇ 110> is regularly the intensity I 111 of the position (111) ⁇ 110> to the intensity I 001 of the position (001) ⁇ 110> of the ⁇ -fiber ratio I 111 / I 001 > 0.4.
  • Such entieries hot strip can be processed at very low degrees of deformation to NO electrical steel.
  • Hot rolled strip according to the invention with hot strip thicknesses of ⁇ 1.8 mm can be manufactured in different ways; conventional hot strip mills with possibilities of Realization of above thicknesses, Casting rolling plants (casting of Thin slabs with subsequent in-line hot rolling), Thin strip casting machines with subsequent multi-stage casting Hot rolling of the thin strip.
  • the invention at least one pass of hot rolling at temperatures, where the hot strip is an austenitic structure and several subsequent stitches of the Hot rolling performed at temperatures in which the Hot strip has a ferritic structure.
  • the hot strip is an austenitic structure and several subsequent stitches of the Hot rolling performed at temperatures in which the Hot strip has a ferritic structure.
  • the final rolling temperature is Hot rolling less than 850 ° C.
  • one of the last forming passes rolled with lubrication.
  • hot rolling with lubrication occur on the one hand lower shear deformations, so that the rolled strip as a result, a more homogeneous structure across the cross section receives.
  • the lubrication reduces so that above the respective Walzstich a higher thickness decrease is possible. Therefore It can, depending on the desired properties of the too generating electric sheet, be advantageous if all occurring in the ferrite Umformstiche with a rolling lubrication be performed.
  • Hot rolled strips according to the invention can be used in particular reliably reproducible work results first by an inventively melted composite steel and then this steel is poured into thin slabs, which then hot-rolled continuously ("in-line") to hot strip become. It is during the hot rolling achieved overall degree of deformation preferably at least 90%, the hot rolling usually in several passes will be carried out.
  • the the known casting rolls own continuous Sequence of potting steel to thin slabs and hot rolling the thin slabs to hot strip also allowed in the production of inventive hot strips the Saving of work steps, such as reheating slabs and roughing.
  • inventive hot strips themselves affects the material condition in the different Production phases. This is partly different significantly from that in the conventional generation of Hot strip reached, with a reheating the cooled slab is started.
  • the macro segregations as well as the solution and Excretion state the inventively generated Hot strips differ from conventionally produced.
  • the forming process takes place during in-line casting rolling during hot rolling at favorable thermal Conditions.
  • the rolling passes with higher Forming degrees applied and the forming conditions specifically used for the control of microstructure development become.
  • the phosphorus content less than 0.08 wt% limited to sufficient G manigenticianen to achieve.
  • the molten steel was cast into a slab which was then conventionally cooled, reheated, pre-rolled and hot-rolled to a final thickness of 2.5 mm.
  • the hot-rolled strip Wb V1 thus obtained had an orientation density of the ⁇ -fiber of at least 4 determined in the band center for an orientation angle ⁇ of 0 ° to 20 °, while the orientation density for angles ⁇ of more than 20 ° was regularly less than 3.
  • the value of the ratio I 112 / I 001 of the intensity I 112 of the layer (112) ⁇ 110> to the intensity I 110 of the layer (001) ⁇ 110> of the ⁇ -fiber was therefore just under 0.1 as the value of the ratio I. 111 / I 001 of the intensity I 111 of the component (111) ⁇ 110> to the intensity I 110 of the component (001) ⁇ 110>.
  • the high density in the range of small angles and the low density in the range of large angles prove that the hot strip Wb V1 has been in a solidified state in which it must first be subjected to a complex cold rolling and aftertreatment in order to be used as NO electric sheet to be able to.
  • the same steel was first cast into a thin-slab in a casting-rolling plant, which was then hot-rolled in-line in several passes to a hot-strip thickness of 3 mm.
  • the hot strip Wb V2 thus obtained, like the hot strip Wb V1 for an orientation angle ⁇ of 0 ° to 20 °, had an orientation density of the ⁇ -fiber of at least 4 determined in the center of the strip, while the orientation density for angles ⁇ of more than 20 ° was regular was significantly less than 3.
  • the value of the ratio I 112 / I 001 of the intensity I 112 of the layer (112) ⁇ 110> to the intensity I 110 of the layer (001) ⁇ 110> of the ⁇ -fiber was 0.2, while the value of the ratio I 111 / I 001 the intensity I 111 of the position (111) ⁇ 110> to the intensity I 110 of the position (001) ⁇ 110> reached only 0.06.
  • the hot strip Wb V2 has been in a solidified state in which it must first undergo an expensive cold rolling and aftertreatment, to use it as a NO electrical sheet.
  • the hot strip Wb E according to the invention has also been produced from the same steel as the hot strip Wb V1 produced for comparison.
  • the steel in question has also been cast in a casting-rolling plant to a thin slab, which was then also hot rolled "in-line" in several passes.
  • the final thickness of the hot-rolled strip was only 1.04 mm.
  • the hot-rolled strip Wb E thus obtained had an orientation density of the ⁇ -fiber of at least 4 determined in the center of the strip for all orientation angles ⁇ in the range from 0 ° to 60 °. Only in the angular range of more than 60 ° did the orientation density decrease below 3.
  • the value of the ratio I 112 / I 001 of the intensity I 112 of the position (112) ⁇ 110> to the intensity I 110 of the component (001) ⁇ 110> of the ⁇ - Fiber was at a high level, namely at 0.81.
  • the value of the ratio I 111 / I 001 of the intensity I 111 of the layer (111) ⁇ 110> to the intensity I 110 of the layer (001) ⁇ 110> reached a high level, namely 0.54.
  • the high orientation densities up to an angle of 60 ° and the high intensities of components (112) ⁇ 110> and (111) ⁇ 110> prove that the inventive Hot strip is located in a partially partially solidified state.

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Abstract

The present invention relates to a hot-rolled steel strip for further processing to form non-grain oriented electrical sheet with the following composition (in % by weight) C: <0.02%, Mn: <=1.2%, Si: 0.1-4.4%, Al 0.1-4.4%, wherein the sum formed from the Si content and twice the Al content is <5%, P: <0.15%, Sn: <=0.20%, Sb: <=0.20%, the remainder iron and unavoidable impurities, with a strip thickness which is at most 1.8 mm, and with a partially softened structure which is characterised by a high intensity for the alpha fibre (fibre representation of orientation distribution functions) in the region of 0° to 60°, wherein the ratio I112/I001 formed from the intensity I112 of the position (112) <110> to the intensity I001 of the position (001) <110> is >0.4 and the ratio I111/I001 formed from the intensity I111 of the position (111) <110> to the intensity I001 of the position (001) <110> is >0.2.

Description

Die Erfindung betrifft ein für die Herstellung von Elektroblech bestimmten warmgewalztes Stahlband und ein Verfahren zu dessen Herstellung.The invention relates to a for the production of Electrical sheet metal hot-rolled steel strip and a Process for its preparation.

Unter dem Begriff "nichtkornorientiertes Elektroblech" wird in diesem Zusammenhang ein Stahlblech oder ein Stahlband verstanden, welches unabhängig von seiner Textur unter die in DIN 46 400 Teil 1 oder 4 genannten Bleche fällt und dessen Verlustanisotropie die in DIN 46 400 Teil 1 festgelegten Höchstwerte nicht überschreitet. Die Begriffe "Blech" und "Band" werden hier synonym verwendet.Under the term "non-grain oriented electrical sheet" is in this context a steel sheet or a Steel band understood, which is independent of his Texture below those mentioned in DIN 46 400 part 1 or 4 Sheet metal falls and its loss anisotropy in DIN 46 400 part 1 limits. The terms "tin" and "band" are synonymous here used.

Konventionell umfaßt die Herstellung von nichtkornorientiertem Elektroblech (NO-Elektroblech) die Schritte:

  • Erschmelzen des Stahls,
  • Vergießen des Stahls zu Brammen,
  • soweit erforderlich, Wiedererwärmen der Brammen,
  • Einsetzen der Brammen in einer Warmwalzstraße,
  • Vorwalzen der Brammen,
  • Fertigwarmwalzen der Brammen zu einem Warmband, dessen Enddicke zwischen 1,8 mm und 5 mm, typischerweise zwischen 2 mm und 3 mm, liegt,
  • Glühen und Beizen des Warmbands, wobei diese Warmbandbehandlungen als kombiniertes Glühbeizen ausgeführt werden können,
  • Kaltwalzen auf Enddicke im Bereich von 0,75 mm bis 0,35 mm oder kleiner oder soweit erforderlich mehrstufig mit zwischengeschalteter Glühung erfolgendes Kaltwalzen des Warmbands auf Enddicke, und
  • Schlußglühen solcher Kaltbänder in Enddicke, die mit einem mindestens 65 % betragenden Gesamtumformgrad kaltgewalzt worden sind, oder
  • Glühen und anschließendes Nachwalzen, mit einem höchstens 20 % betragenden Gesamtumformgrad.
Conventionally, the production of non-oriented electric sheet (NO electric sheet) includes the steps of
  • Melting the steel,
  • Casting the steel into slabs,
  • if necessary, reheating the slabs,
  • Inserting the slabs in a hot rolling mill,
  • Roughing of slabs,
  • Finish hot rolling the slabs into a hot strip whose final thickness is between 1.8 mm and 5 mm, typically between 2 mm and 3 mm,
  • Annealing and pickling of the hot strip, whereby these hot strip treatments can be carried out as combined annealing pickling,
  • Cold rolling to final thickness in the range of 0.75 mm to 0.35 mm or smaller or, if necessary, multi-stage with intermittent annealing cold rolling of the hot strip to final thickness, and
  • Final annealing of such cold-rolled strips in final thickness cold-rolled with a total degree of deformation of at least 65%, or
  • Annealing and subsequent temper rolling, with a maximum degree of deformation of not more than 20%.

Erst durch den Kaltwalzvorgang wird eine Entfestigung des Gefüges durch eine Rekristallisation erreicht, wobei für das Erreichen der üblichen Enddicken des Endproduktes "Kaltgewalztes NO-Elektroband" (Ausgangspunkt Warmband > 1,8 mm, Enddicke 0,35 bis 0,75 mm) Gesamtumformgrade von > 65 % erforderlich sind. Kennzeichnend für ein entfestigtes Gefüge ist eine Intensitätsverteilung der α-Fasertextur derart, daß eine erhöhte Intensität der Komponente {112}<110> auftritt und die Kaltwalzkomponente (001) <110> weitgehend abgebaut wird.Only by the cold rolling process is a softening of the Microstructure achieved by a recrystallization, where for the achievement of the usual final thickness of the final product "Cold-rolled NO electrical steel" (starting point hot strip> 1.8 mm, final thickness 0.35 to 0.75 mm) > 65% are required. Characteristic of a Deformed structure is an intensity distribution of the α-fiber texture such that an increased intensity of Component {112} <110> occurs and the cold rolling component (001) <110> is largely degraded.

Damit schafft erst das Kaltwalzen mit diesen hohen Gesamtumformgraden die Voraussetzung für die Möglichkeit der Nutzung einer heute üblichen Schlussglühung in Form einer "Kurzzeitglühung" (Durchlaufofen - geringe Zeiten hoher Temperaturen für das Band) mit dem Ziel des Erreichens eines entfestigten Gefüges und einer optimalen Korngröße im Fertigprodukt "Kaltgewalztes NO-Elektroband".This is what creates cold rolling with these high ones Total reshaping requirements for the possibility the use of a customary final annealing in form a "Kurzzeitglühung" (continuous furnace - low times high temperatures for the band) with the aim of Achieve a softened structure and optimal Grain size in the finished product "Cold-rolled NO electrical steel".

Die Vielzahl der bei solch konventioneller Vorgehensweise durchzuführenden Arbeitsschritte führt zu hohem apparativem und kostenmäßigem Aufwand. Daher wird seit jüngerer Zeit verstärkt daran gearbeitet, das Vergießen des Stahls und die anschließenden Walzprozesse bei der Warmbandherstellung so zu gestalten, daß ein Warmband in der Dicke zu ≤ 1,8 mm entsteht. Ein Weg für das Erreichen dieses Zieles ist eine kontinuierliche Abfolge des Gieß- und des Walzvorgangs unter Einsparung des Wiedererwärmens und des Vorwalzens.The variety of such conventional approach To be performed steps leads to high apparativem and kostenmäßig effort. Therefore, since More recently, work has been done to increase the shedding of the steel and the subsequent rolling processes at the To make hot strip production so that a hot strip in the thickness is ≤ 1.8 mm. A way to reach This objective is a continuous succession of casting and the rolling process to save reheating and pre-rolling.

Zu diesem Zweck sind sogenannte "Gieß-Walz-Anlagen" entwickelt und errichtet worden. In diesen auch "CSP-Anlagen" genannten Vorrichtungen wird der Stahl zu einem kontinuierlich abgezogenen Strang (Dünnbramme) vergossen, die dann "in-line" zu Warmband warmgewalzt werden. Die beim Betrieb von Gieß-Walz-Anlagen gewonnenen Erfahrungen und die Vorteile des "in-line" erfolgenden Gieß-Walzens sind beispielsweise in W. Bald u.a. "Innovative Technologie zur Banderzeugung", Stahl und Eisen 119 (1999) Nr. 3, Seiten 77 - 85, oder C. Hendricks u.a. "Inbetriebnahme und erste Ergebnisse der Gießwalzanlage der Thyssen Krupp Stahl AG", Stahl und Eisen 120 (2000) Nr. 2, Seiten 61 - 68, dokumentiert worden.For this purpose, so-called "casting-rolling plants" developed and built. In these also "CSP plants" mentioned devices, the steel becomes a cast continuously withdrawn strand (thin slab), which are then hot rolled in-line to hot strip. The Experience gained in the operation of cast-rolling plants and the benefits of "in-line" casting rolling are, for example, in W. Bald et al. "Innovative Banding Technology ", Steel and Iron 119 (1999) No. 3, pages 77-85, or C. Hendricks et al. "Commissioning and initial results of the casting rolling mill Thyssen Krupp Stahl AG ", Steel and Iron 120 (2000) No. 2, pages 61-68.

Aber auch im Rahmen der klassischen Anlagentechnik zum Warmwalzen, eingeschlossen das Vor- und Zwischenwalzen, wird versucht bei Einsatz von konventionellen Brammen Warmbanddicken von ≤ 1,5 mm zu erzielen, siehe z. B. JP 2001 123225 A2.But also in the context of classical plant technology for Hot rolling, including pre and intermediate rolling, is tried when using conventional slabs Hot strip thicknesses of ≤ 1.5 mm can be achieved, see eg. B. JP 2001 123225 A2.

Neben dem zuletzt genannten Verfahren ist aus der DE 100 15 691 C1 ein Verfahren zur Erzeugung eines NO-Elektroblechs bekannt, bei dem mindestens der letzte Stich des Warmwalzens im Mischgebiet Austenit-Ferrit durchgeführt werden soll. Bei einem derart gewalzten Warmband wird eine teilentfestigte Struktur des erhaltenen Blechs erst dadurch erreicht, daß eine besonders hohe Haspeltemperatur eingestellt wird. Ist dies der Fall, so hat die im Coil wirkende Eigenhitze dieselbe Wirkung wie eine separate Glühbehandlung des Warmbands. Auf diese Weise kann auf eine solche separate Warmbandglühung ganz oder teilweise verzichtet werden. Demnach wird der teilentfestigte Zustand bei diesem Stand der Technik erst erreicht, nachdem eine Glühung des Warmbandes oder eine einer solchen Glühung gleichkommende Wärmebeeinflussung des Warmbandes im Coil durchgeführt worden ist. Wie stark diese Entfestigung ist, bleibt dabei offen.In addition to the last mentioned method is from the DE 100 15 691 C1 discloses a method for producing a NO electric sheet known in which at least the last stitch of the Hot rolling in the mixed area austenite ferrite performed shall be. In such a rolled hot strip is a teilentfestigte structure of the obtained sheet only achieved in that a particularly high Reel temperature is set. If this is the case, then the self-heating effect in the coil has the same effect as a separate annealing treatment of the hot strip. To this Way can be quite to such a separate hot strip annealing or partially waived. Accordingly, the teilentfestigte state in this prior art only achieved after an annealing of the hot strip or a heat influence equivalent to such annealing of the hot strip has been carried out in the coil. How strong this softening is, remains open.

Der Erfindung lag die Aufgabe zugrunde, ein kostengünstig herstellbares Warmband mit teilentfestigter Gefügestruktur bei einer Dicke von höchstens 1,8 mm zu realisieren, welches sich aufgrund dieser Eigenschaften in besonderer Weise zur Herstellung von hochwertigen Elektroblechen eignet.The invention was based on the object, a cost producible hot strip with partially solidified Microstructure with a thickness of at most 1.8 mm too realize which is due to these characteristics in a special way for the production of high quality Electric sheets is suitable.

Diese Aufgabe wird ausgehend von dem voranstehend erläuterten Stand der Technik durch ein warmgewalztes Stahlband gelöst,

  • welches folgende Zusammensetzung (in Gew.-%) aufweist:
  • C: < 0,02 %,
  • Mn: ≤ 1, 2 %,
  • Si:0,1 - 4,4 %,
  • Al:0,1 - 4,4 %,
    • wobei die aus dem Si-Gehalt und dem Doppelten des Al-Gehaltes gebildete Summe ([%Si] + 2x[%Al]) < 5 % ist,
  • P: < 0,15 %
  • Sn: ≤ 0,20 %,
  • Sb: ≤ 0,20 %,
    •  Rest Eisen und unvermeidbare Verunreinigungen,
  • dessen Banddicke höchstens 1,8 mm beträgt, und
  • das eine teilentfestigte Gefügestruktur besitzt, die durch eine hohe Intensität der α-Faser (Faserdarstellung von Orientierungsverteilungsfunktionen) im Bereich bis 60° gekennzeichnet ist, wobei das aus der Intensität I112 der Lage (112)<110> zur Intensität I001 der Lage (001)<110> gebildete Verhältnis I112/I001 >0,4 und das aus der Intensität I111 der Lage (111)<110> zur Intensität I001 der Lage (001)<110> gebildete Verhältnis I112/I001 >0,2 ist.
This object is achieved on the basis of the above-described prior art by a hot-rolled steel strip,
  • which has the following composition (in% by weight):
  • C: <0.02%,
  • Mn: ≤ 1, 2%,
  • Si: 0.1-4.4%,
  • Al: 0.1-4.4%,
    • wherein the sum formed from the Si content and the double of the Al content ([% Si] + 2x [% Al]) is <5%,
  • P: <0.15%
  • Sn: ≤ 0.20%,
  • Sb: ≦ 0.20%,
    • Residual iron and unavoidable impurities,
  • whose strip thickness is at most 1.8 mm, and
  • which has a partially solidified microstructure, characterized by a high intensity of the α-fiber (fiber representation of orientation distribution functions) in the range up to 60 °, which from the intensity I 112 of the layer (112) <110> to the intensity I 001 of the position ( 001) <110> formed ratio I 112 / I 001> 0.4 and selected from the intensity I 111 of the position (111) <110> to the intensity I 001 formed of the layer (001) <110> ratio I 112 / I 001 > 0.2.

Die Erfindung geht von der Erkenntnis aus, daß sich bei Wahl eines geeigneten Herstellweges ein Warmband zur Verfügung stellen läßt, das schon im warmgewalzten Zustand ein Gefüge aufweist, welches sich bei konventioneller Fertigungsweise nur durch Kaltwalzen bei hohen Umformgraden erzeugen läßt. So besitzt erfindungsgemäß zusammengesetztes und beschaffenes Warmband bei einer Banddicke von höchstens 1,8 mm eine teilentfestigte Gefügestruktur. Diese Gefügestruktur zeichnet sich durch hohe Intensitäten der α-Faser im Bereich von Winkeln bis 60° für spezifische Lagen aus, also in einem Winkelbereich, in dem bei konventionellen Warmbändern vergleichbarer Zusammensetzung üblicherweise keine merklichen Intensitäten für diese Lagen festgestellt werden können. Kennzeichnend sind die hohen Intensitäten der spezifischen Lagen (112)<110> sowie (111)<110>, wobei sich für die Verhältnisse der Intensitäten I112 der Lage (112)<110> zur Intensität I001 der Lage (001)<110> ein Wert > 0,4 bzw. der Intensität I111 der Lage (111)<110> zur Intensität I001 der Lage (001)<110> ein Wert > 0,2 ergibt.Aufgrund dieser Beschaffenheit läßt sich erfindungsgemäßes Warmband in hervorragender Weise zu kaltgewalztem NO-Elektroblech verarbeiten, dessen Enddicke typischerweise 0,35 mm bis 0,75 mm, insbesondere 0,2 mm, 0,35 mm, 0,50 mm oder 0,65 mm, beträgt.The invention is based on the recognition that, when choosing a suitable preparation path, a hot strip can be made available, which already has a microstructure in the hot rolled state, which can be produced only by cold rolling at high degrees of deformation in conventional manufacturing. Thus, according to the invention assembled and procured hot strip at a strip thickness of at most 1.8 mm has a partially solidified microstructure. This microstructure is characterized by high intensities of the α-fiber in the range of angles up to 60 ° for specific layers, ie in an angular range in which in conventional hot strips of comparable composition usually no appreciable intensities for these layers can be determined. Characteristic are the high intensities of the specific layers (112) <110> and (111) <110>, wherein for the ratios of the intensities I 112 of the layer (112) <110> to the intensity I 001 of the layer (001) <110 > a value> 0.4 or the intensity I 111 of the layer (111) <110> to the intensity I 001 of the layer (001) <110> gives a value> 0.2. Owing to this nature, the hot strip according to the invention can be characterized in excellent Process to cold-rolled NO electrical steel whose final thickness is typically 0.35 mm to 0.75 mm, in particular 0.2 mm, 0.35 mm, 0.50 mm or 0.65 mm.

Konventionelle Warmbänder unterscheiden sich von erfindungsgemäßen dadurch, daß bei ihnen merkbare Intensitäten nur im Bereich von bis zu 25°(-30°) auftreten, während für die Komponenten (112)<110> und (111)<110> keine höheren Intensitäten mehr feststellbar sind. Bei den konventionellen Warmbändern liegt typischerweise ein Intensitätsmaximum der α-Faserstruktur bei 0° vor, von dem ausgehend die Intensität mit zunehmendem Winkel abnimmt. Diese Intensitätsverteilung der α-Faser entspricht einem verfestigten Gefüge. Erst durch den Kaltwalzvorgang wird bei solchen Stahlbändern eine Entfestigung des Gefüges durch eine Rekristallisation bei der anschließenden Glühung erreicht. Dazu sind Gesamtumformgrade von mehr als 65 % erforderlich, die einerseits eine bestimmte Mindestdicke des kaltzuwalzenden Warmbands und andererseits eine erhebliche Walzarbeit bei der Kaltumformung des Bandes voraussetzen.Conventional hot strips differ from according to the invention characterized in that noticeable in them Intensities only in the range of up to 25 ° (-30 °) occur while for the components (112) <110> and (111) <110> no higher intensities detectable are. With the conventional hot tapes lies typically an intensity maximum of the α-fiber structure at 0 °, from which the intensity with increasing angle decreases. This intensity distribution The α-fiber corresponds to a solidified structure. First by the cold rolling process is in such steel strips a softening of the structure by a Recrystallization in the subsequent annealing reached. For this purpose, overall degrees of deformation of more than 65% are required, on the one hand a certain minimum thickness cold-rolled hot strip and on the other hand a considerable rolling work during the cold forming of the strip provide.

Erfindungsgemäßes Warmband ist demgegenüber so beschaffen, daß die Intensitäten der Komponente (112)<110> und die Intensitäten der Lage (111)<110> hoch sind. Gleichzeitig weist erfindungsgemäßes Warmband eine besonderes geringe Enddicke auf. Das erfindungsgemäße Warmband schafft so weitaus günstigere Verhältnisse für die nachfolgende Verarbeitung als dies konventionelle Warmbänder sich leisten können. So läßt sich erfindungsgemäßes Warmband ausgehend von seiner geringen Dicke von höchstens 1,8 mm bei minimierter Gesamtumformung zu einem nichtkornorientierten Elektroblech kaltverformen, dessen Eigenschaften mindestens gleich den Eigenschaften konventionell erzeugter NO-Elektrobleche ist.In contrast, hot strip according to the invention is so procure that the intensities of the component (112) <110> and the intensities of the layer (111) <110> high are. At the same time, hot strip according to the invention has a special low final thickness. The invention Hot strip creates so much more favorable conditions for the subsequent processing than this conventional Hot strips can afford. That's how it works Hot strip according to the invention starting from its low Thickness of at most 1.8 mm at minimized Total transformation to a non-grain oriented Cold-forming electrical sheet, its properties at least equal to the properties conventional produced NO-electric sheets is.

Betreffs der verwendeten Begriffe α-Faser, Intensität und Lage ist festzuhalten, daß mittels der Orientierungsverteilungsfunktion die Textur einer kristallinen Phase quantitativ beschrieben wird.Regarding the terms used α-fiber, intensity and Location is to be noted that by means of Orientation distribution function the texture of a crystalline phase is described quantitatively.

Die Orientierungsverteilungsfunktion beschreibt die relative Lage von Kristallkoordinatensystem und Probenkoordinatensystem. Die Orientierungsverteilungsfunktion weist jedem Punkt im Raum eine Orientierungsdichte oder Intensität zu. Da eine Darstellung der Orientierungverteilungsfunktion sehr kompliziert und nicht sehr anschaulich ist, wird eine vereinfachte Beschreibung mit Hilfe von Fasern gewählt. Die für Stähle relevanten Fasern sind:
a-Faser, γ-Faser, η-Faser, ζ-Faser, δ-FaserThe orientation distribution function describes the relative position of the crystal coordinate system and the sample coordinate system. The orientation distribution function assigns an orientation density or intensity to each point in space. Since a representation of the orientation distribution function is very complicated and not very clear, a simplified description with the aid of fibers is chosen. The relevant fibers for steels are:
a-fiber, γ-fiber, η-fiber, ζ-fiber, δ-fiber

Bei der hier betrachteten a- Faser liegt die <110>-Richtung parallel zur Walzrichtung; sie verläuft zwischen den Lagen (001)<110> und (110)<110>. The a fiber considered here is the <110> direction parallel to the rolling direction; she passes between the layers (001) <110> and (110) <110>.

Einen für die Weiterverarbeitung besonders günstigen Entfestigungszustand weist erfindungsgemäßes Warmband dann auf, wenn seine Banddicke höchstens 1,2 mm beträgt. Bei derart dünnem erfindungsgemäßen Warmband ist regelmäßig das aus der Intensität I112 der Lage(112)<110> zur Intensität I001 der Lage (001)<110> der α-fasergebildete Verhältnis I112/I001 > 0,75 und das aus der Intensität I111 der Lage (111)<110> zur Intensität I001 der Lage (001)<110> der α-Faser gebildete Verhältnis I111/I001 > 0,4. Derart entfestigtes Warmband läßt sich bei besonders geringen Umformgraden zu NO-Elektroblech verarbeiten.A particularly advantageous for further processing Entfestigungszustand has inventive hot strip then, if its strip thickness is at most 1.2 mm. In the case of such a thin hot strip according to the invention, the ratio I 112 / I 001 > 0.75 formed from the intensity I 112 of the layer (112) <110> to the intensity I 001 of the layer (001) <110> is regularly the intensity I 111 of the position (111) <110> to the intensity I 001 of the position (001) <110> of the α-fiber ratio I 111 / I 001 > 0.4. Such entfestigtes hot strip can be processed at very low degrees of deformation to NO electrical steel.

Erfindungsgemäße Warmbänder mit Warmbanddicken von ≤ 1,8 mm können auf verschiedenen Wegen gefertigt werden; konventionelle Warmbandstraßen mit Möglichkeiten der Realisierung obigen Dicken, Gießwalzanlagen (Gießen von Dünnbrammen mit anschließendem In-line Warmwalzen), Dünnbandgießanlagen mit anschließendem mehrstufigem Warmwalzen des Dünnbandes. Dabei werden erfindungsgemäß mindestens ein Stich des Warmwalzens bei Temperaturen, bei denen das Warmband eine austenitische Struktur aufweist, und mehrere darauffolgende Stiche des Warmwalzens bei Temperaturen durchgeführt, in denen das Warmband eine ferritische Struktur besitzt. Durch ein derart gezielt in den einzelnen Phasenzustandsbereichen vorgenommenes Walzen lassen sich insbesondere bei umwandelnden Legierungen Warmbänder erzeugen, die in Bezug auf die an NO-Elektrobleche gestellten Anforderungen optimierte Eigenschaften besitzen. Es hat sich beispielsweise gezeigt, daß sich durch eine geeignete Kombination der Phasenabfolge beim Warmwalzen in Verbindung mit bestimmten Endwalz- und Haspeltemperaturen eine entscheidende Anhebung der magnetischen Polarisation erreichen läßt. Um sicherzustellen, daß mindestens der letzte Stich des Warmwalzens bei ferritischem Gefüge im Warmband durchgeführt wird, beträgt die Endwalztemperatur beim Warmwalzen weniger als 850 °C.Hot rolled strip according to the invention with hot strip thicknesses of ≤ 1.8 mm can be manufactured in different ways; conventional hot strip mills with possibilities of Realization of above thicknesses, Casting rolling plants (casting of Thin slabs with subsequent in-line hot rolling), Thin strip casting machines with subsequent multi-stage casting Hot rolling of the thin strip. In this case, the invention at least one pass of hot rolling at temperatures, where the hot strip is an austenitic structure and several subsequent stitches of the Hot rolling performed at temperatures in which the Hot strip has a ferritic structure. Through a so targeted in the individual phase state areas made rolling can be especially at convertible alloys produce hot strips, which in Referring to the NO-electric sheets put Have requirements optimized properties. It has For example, it is shown that by a suitable combination of the phase sequence during hot rolling in connection with certain final rolling and Reel temperatures are a crucial boost to the can achieve magnetic polarization. Around make sure that at least the last stitch of the Hot rolling in ferritic microstructure in hot strip is performed, the final rolling temperature is Hot rolling less than 850 ° C.

Vorzugsweise wird während des Warmwalzens mindestens bei einem der letzten Umformstiche mit Schmierung gewalzt. Durch das Warmwalzen mit Schmierung treten einerseits geringere Scherverformungen auf, so daß das gewalzte Band im Ergebnis eine homogenere Struktur über den Querschnitt erhält. Andererseits werden durch die Schmierung die Walzkräfte vermindert, so daß über dem jeweiligen Walzstich eine höhere Dickenabnahme möglich ist. Daher kann es, je nach den gewünschten Eigenschaften des zu erzeugenden Elektroblechs, vorteilhaft sein, wenn sämtliche im Ferritgebiet erfolgenden Umformstiche mit einer Walzschmierung durchgeführt werden.Preferably, at least during hot rolling one of the last forming passes rolled with lubrication. By hot rolling with lubrication occur on the one hand lower shear deformations, so that the rolled strip as a result, a more homogeneous structure across the cross section receives. On the other hand, by the lubrication the Walzkräfte reduced so that above the respective Walzstich a higher thickness decrease is possible. Therefore It can, depending on the desired properties of the too generating electric sheet, be advantageous if all occurring in the ferrite Umformstiche with a rolling lubrication be performed.

Erfindungsgemäße Warmbänder lassen sich insbesondere mit zuverlässig reproduzierbaren Arbeitsergebnissen herstellen, indem zunächst ein erfindungsgemäß zusammengesetzter Stahl erschmolzen und anschließend dieser Stahl zu Dünnbrammen vergossen wird, die dann kontinuierlich ("in-line") zu Warmband warmgewalzt werden. Dabei beträgt der während des Warmwalzens erzielte Gesamtumformgrad vorzugweise mindestens 90 %, wobei das Warmwalzen üblicherweise in mehreren Stichen durchgeführt werden wird.Hot rolled strips according to the invention can be used in particular reliably reproducible work results first by an inventively melted composite steel and then this steel is poured into thin slabs, which then hot-rolled continuously ("in-line") to hot strip become. It is during the hot rolling achieved overall degree of deformation preferably at least 90%, the hot rolling usually in several passes will be carried out.

Die dem bekannten Gieß-Walzen eigene kontinuierliche Aufeinanderfolge von Vergießen des Stahls zu Dünnbrammen und Warmwalzen der Dünnbrammen zu Warmband gestattet auch bei der Herstellung erfindungsgemäßer Warmbänder die Einsparung von Arbeitsschritten, wie die Wiedererwärmung der Brammen und das Vorwalzen. Darüber hinaus zeigt sich, daß die Einsparung der betreffenden Arbeitsschritte sich auswirkt auf den Werkstoffzustand in den verschiedenen Herstellungsphasen. Dieser unterscheidet sich zum Teil erheblich von dem bei der konventionellen Erzeugung von Warmband erreichten, bei der mit einer Wiedererwärmung der abgekühlten Bramme begonnen wird. Insbesondere sind es die Makro-Seigerungen sowie der Lösungs- und Ausscheidungszustand, die erfindungsgemäß erzeugte Warmbänder von konventionell erzeugten unterscheidet. Zudem erfolgt beim In-Line-Gieß-Walzen der Umformvorgang während des Warmwalzens bei günstigen thermischen Bedingungen. So können die Walzstiche mit höheren Umformgraden aufgebracht und die Umformbedingungen gezielt für die Steuerung der Gefügeentwicklung genutzt werden.The the known casting rolls own continuous Sequence of potting steel to thin slabs and hot rolling the thin slabs to hot strip also allowed in the production of inventive hot strips the Saving of work steps, such as reheating slabs and roughing. In addition, it turns out that the saving of the relevant work steps themselves affects the material condition in the different Production phases. This is partly different significantly from that in the conventional generation of Hot strip reached, with a reheating the cooled slab is started. In particular are it the macro segregations as well as the solution and Excretion state, the inventively generated Hot strips differ from conventionally produced. In addition, the forming process takes place during in-line casting rolling during hot rolling at favorable thermal Conditions. Thus, the rolling passes with higher Forming degrees applied and the forming conditions specifically used for the control of microstructure development become.

Bevorzugt ist bei Einsatz des Gießwalzens bei dem erfindungsgemäßen Warmband der Phosphor-Gehalt auf weniger als 0,08 Gew.-% beschränkt, um ausreichende Gießeigenschaften zu erzielen.When using the casting rolling in the Hot strip according to the invention the phosphorus content less than 0.08 wt% limited to sufficient Gießigenschaften to achieve.

Nachfolgend wird die Erfindung anhand von Ausführungsbeispielen erläutert. In dem Diagramm ist für drei Beispiele der Verlauf der Orientierungsverteilungsfunktion (Orientierungsdichte) über den Winkel Φ aufgetragen. "Φ" ist einer der Euler-Winkel, die die relative Lage von Kristallkoordinationen und Probekoordinationensystem beschreiben. Gleichzeitig sind spezielle Lagen eingetragen: (001)<110>, (112)<110>, (111)<110> und andere.Zur Ermittlung der Eigenschaften eines Beispiels für ein erfindungsgemäßes Warmband WbE sowie zweier Vergleichsbeispiele für nicht erfindungsgemäße Warmbänder WbV1 und WbV2 ist ein Stahl mit (in Gew.-% bzw. Gew.-ppm) < 30 ppm C, 0,2 % Mn, 0,050 % P, 1,3 % Si, 0,12 % Al, 0,01 % Si und als Rest Fe sowie Verunreinigungen erschmolzen worden.The invention will be explained below with reference to exemplary embodiments. In the diagram, the course of the orientation distribution function (orientation density) over the angle Φ is plotted for three examples. "Φ" is one of the Euler angles describing the relative location of crystal coordination and the sample coordination system. At the same time, special layers are entered: (001) <110>, (112) <110>, (111) <110> and others. To determine the properties of an example of a hot strip Wb E according to the invention and two comparative examples for hot strips Wb V1 not according to the invention and Wb V2 is a steel having (in wt.% and wt. ppm, respectively) <30 ppm C, 0.2% Mn, 0.050% P, 1.3% Si, 0.12% Al, 0.01 % Si and remainder Fe and impurities have been melted.

Im Fall des zum Vergleich angefertigten Warmbands WbV1 ist der erschmolzene Stahl zu einer Bramme vergossen worden, die anschließend in konventioneller Weise abgekühlt, wiedererwärmt, vorgewalzt und auf eine Enddicke von 2,5 mm warmgewalzt worden ist. Das so erhaltene Warmband WbV1 wies für einen Orientierungswinkel Φ von 0° bis 20° eine in der Bandmitte ermittelte Orientierungsdichte der α-Faser von mindestens 4 auf, während die Orientierungsdichte für Winkel Φ von mehr als 20° regelmäßig weniger als 3 betrug. Der Wert des Verhältnisses I112/I001 der Intensität I112 der Lage (112)<110> zur Intensität I110 der Lage (001)<110> der α-Faser lag dementsprechend genauso unter 0,1 wie der Wert des Verhältnisses I111/I001 der Intensität I111 der Komponente (111)<110> zur Intensität I110 der Komponente (001)<110>.In the case of the hot-rolled Wb V1 made for comparison, the molten steel was cast into a slab which was then conventionally cooled, reheated, pre-rolled and hot-rolled to a final thickness of 2.5 mm. The hot-rolled strip Wb V1 thus obtained had an orientation density of the α-fiber of at least 4 determined in the band center for an orientation angle Φ of 0 ° to 20 °, while the orientation density for angles Φ of more than 20 ° was regularly less than 3. The value of the ratio I 112 / I 001 of the intensity I 112 of the layer (112) <110> to the intensity I 110 of the layer (001) <110> of the α-fiber was therefore just under 0.1 as the value of the ratio I. 111 / I 001 of the intensity I 111 of the component (111) <110> to the intensity I 110 of the component (001) <110>.

Der Verlauf der Orientierungsdichte über den Winkel Φ ist im Diagramm für das zum Vergleich dienende Warmband WbV1 als gepunktete Linie dargestellt.The course of the orientation density over the angle Φ is shown as a dotted line in the diagram for the hot-rolled strip Wb V1 used for comparison.

Die hohe Dichte im Bereich kleiner Winkel und die niedrige Dichte im Bereich großer Winkel belegt, daß sich das Warmband WbV1 in einem verfestigten Zustand befunden hat, in der es erst einer aufwendigen Kaltwalzung und Nachbehandlung unterzogen werden muß, um als NO-Elektroblech eingesetzt werden zu können.The high density in the range of small angles and the low density in the range of large angles prove that the hot strip Wb V1 has been in a solidified state in which it must first be subjected to a complex cold rolling and aftertreatment in order to be used as NO electric sheet to be able to.

Zur Herstellung des ebenfalls zum Vergleich angefertigten Warmbands WbV2 ist derselbe Stahl in einer Gieß-Walz-Anlage zunächst zu einer Dünnbramme vergossen worden, welche anschließend ebenso "in-line" in mehreren Stichen auf eine Warmbandenddicke von 3 mm warmgewalzt wurde.To produce the hot strip Wb V2 , also made for comparison, the same steel was first cast into a thin-slab in a casting-rolling plant, which was then hot-rolled in-line in several passes to a hot-strip thickness of 3 mm.

Das so erhaltene Warmband WbV2 wies genauso wie das Warmband WbV1 für einen Orientierungswinkel Φ von 0° bis 20° eine in der Bandmitte ermittelte Orientierungsdichte der α-Faser von mindestens 4 auf, während die Orientierungsdichte für Winkel Φ von mehr als 20° regelmäßig deutlich weniger als 3 betrug. Der Wert des Verhältnisses I112/I001 der Intensität I112 der Lage (112)<110> zur Intensität I110 der Lage (001)<110> der α-Faser lag bei 0,2, während der Wert des Verhältnisses I111/I001 der Intensität I111 der Lage (111)<110> zur Intensität I110 der Lage (001)<110> lediglich 0,06 erreichte.The hot strip Wb V2 thus obtained, like the hot strip Wb V1 for an orientation angle Φ of 0 ° to 20 °, had an orientation density of the α-fiber of at least 4 determined in the center of the strip, while the orientation density for angles Φ of more than 20 ° was regular was significantly less than 3. The value of the ratio I 112 / I 001 of the intensity I 112 of the layer (112) <110> to the intensity I 110 of the layer (001) <110> of the α-fiber was 0.2, while the value of the ratio I 111 / I 001 the intensity I 111 of the position (111) <110> to the intensity I 110 of the position (001) <110> reached only 0.06.

Der Verlauf der Orientierungsdichte über den Winkel Φ ist für das zum Vergleich dienende Warmband WbV2 im Diagramm als strichpunktierte Linie dargestellt.The course of the orientation density over the angle Φ is shown in dash-dotted lines in the diagram for the hot-rolled strip Wb V2 used for comparison.

Auch im Fall des Warmbands WbV2 belegt die hohe Dichte im Bereich kleiner Winkel und die niedrige Dichte im Bereich großer Winkel, daß sich das Warmband WbV2 in einem verfestigten Zustand befunden hat, in der es erst einer aufwendigen Kaltwalzung und Nachbehandlung unterzogen werden muß, um es als NO-Elektroblech einsetzen zu können. Also in the case of the hot strip Wb V2, the high density in the range of small angles and the low density in the range of large angles prove that the hot strip Wb V2 has been in a solidified state in which it must first undergo an expensive cold rolling and aftertreatment, to use it as a NO electrical sheet.

Auch das erfindungsgemäße Warmband WbE ist aus demselben Stahl wie das zum Vergleich gefertigte Warmband WbV1 hergestellt worden. Dazu ist der betreffende Stahl ebenfalls in einer Gieß-Walz-Anlage zu einer Dünnbramme vergossen worden, welche anschließend ebenso "in-line" in mehreren Stichen warmgewalzt wurde. Im Unterschied zum Warmband WbV2 betrug die Enddicke des Warmbands jedoch lediglich 1,04 mm.The hot strip Wb E according to the invention has also been produced from the same steel as the hot strip Wb V1 produced for comparison. For this purpose, the steel in question has also been cast in a casting-rolling plant to a thin slab, which was then also hot rolled "in-line" in several passes. In contrast to the hot-rolled Wb V2, however , the final thickness of the hot-rolled strip was only 1.04 mm.

Das so erhaltene Warmband WbE wies für alle Orientierungswinkel Φ im Bereich von 0° bis 60° eine in der Bandmitte ermittelte Orientierungsdichte der α-Faser von mindestens 4 auf. Erst im Winkelbereich von mehr als 60° sank die Orientierungsdichte unter 3. Der Wert des Verhältnisses I112/I001 der Intensität I112 der Lage (112)<110> zur Intensität I110 der Komponente (001)<110> der α-Faser lag auf hohem Niveau, nämlich bei 0,81. Genauso erreichte der Wert des Verhältnisses I111/I001 der Intensität I111 der Lage (111)<110> zur Intensität I110 der Lage (001)<110> ein hohes Niveau, nämlich 0,54.The hot-rolled strip Wb E thus obtained had an orientation density of the α-fiber of at least 4 determined in the center of the strip for all orientation angles Φ in the range from 0 ° to 60 °. Only in the angular range of more than 60 ° did the orientation density decrease below 3. The value of the ratio I 112 / I 001 of the intensity I 112 of the position (112) <110> to the intensity I 110 of the component (001) <110> of the α- Fiber was at a high level, namely at 0.81. Likewise, the value of the ratio I 111 / I 001 of the intensity I 111 of the layer (111) <110> to the intensity I 110 of the layer (001) <110> reached a high level, namely 0.54.

Der Verlauf der Orientierungsdichte über den Winkel Φ ist für das erfindungsgemäße Warmband WbE im Diagramm als durchgezogene Linie dargestellt.The course of the orientation density over the angle Φ is shown for the hot strip Wb E according to the invention in the diagram as a solid line.

Die hohen Orientierungsdichten bis zu einem Winkel von 60° und die hohen Intensitäten der Komponenten (112)<110> sowie (111)<110> belegen, daß sich das erfindungsgemäße Warmband in einem weit teilentfestigten Zustand befindet.The high orientation densities up to an angle of 60 ° and the high intensities of components (112) <110> and (111) <110> prove that the inventive Hot strip is located in a partially partially solidified state.

Claims (10)

  1. Hot-rolled steel strip for further processing to form non-grain oriented electrical sheet
    with the following composition (in % by weight)
    C: < 0.02%
    Mn: ≤ 1.2%
    Si: 0.1 - 4.4%
    Al 0.1 - 4.4%,
    wherein the sum formed from the Si content and twice the Al content is < 5%,
    P: < 0.15%
    Sn: ≤ 0.20%
    Sb: ≤ 0.20%,
    the remainder iron and unavoidable impurities,
    with a strip thickness which is at most 1.8 mm, and
    with a partially softened structure which is
       characterised by a high intensity of the α fibre in the region of 0° to 60°, wherein the ratio I112/I001 formed from the intensity I112 of the position (112) <110> to the intensity I001 of the position (001) <110> is > 0.4 and the ratio I111/I001 formed from the intensity I111 of the position (111) <110> to the intensity I001 of the position (001) <110> is > 0.2.
  2. Hot strip according to claim 1, characterised in that the strip thickness is at most 1.2 mm and the ratio I112/I001 formed from the intensity I112 of the position (112) <110> to the intensity I110 of the position (001) <110> of the α fibre is > 0.75 and the ratio I111/I001 formed from the intensity I111 of the position (111) <110> to the intensity I001 of the position (001) <110> of the α fibre is > 0.4.
  3. Hot strip according to any one of the preceding claims, characterised in that at a first high temperature, it has a ferritic structure, at a second temperature lying below the first temperature, it has a ferritic/austenitic structure, at a third temperature lying below the second temperature, it has an austenitic structure, at a fourth temperature lying below the third temperature it has an austenitic/ferritic structure and at a fifth temperature lying below the fourth temperature it again has a ferritic structure.
  4. Method for producing hot strip composed according to any one of claims 1 to 3, comprising the following working steps:
    melting the steel,
    casting the steel to form thin slabs,
    hot-rolling of the thin slabs following the casting of the steel continuously in-line and being carried out in one or more passes, wherein at least one pass of the hot-rolling is carried out at temperatures at which the hot strip has an austenitic structure, and a plurality of subsequent passes of the hot-rolling are carried out at temperatures in which the hot strip has a ferritic structure and the end rolling temperature during hot-rolling is less than 850°C.
  5. Method according to claim 4, characterised in that the degree of total deformation achieved during the hot-rolling is at least 90%.
  6. Method for producing hot strip composed according to any one of claims 1 to 3, comprising the following working steps:
    melting the steel,
    casting the steel to form a thin strip,
    hot-rolling in one or more passes following the casting of the steel continuously in-line, wherein at least one pass of the hot-rolling is carried out at temperatures at which the hot strip has an austenitic structure, and a plurality of subsequent passes of the hot-rolling are carried out at temperatures in which the hot strip has a ferritic structure and the end rolling temperature during hot-rolling is less than 850°C..
  7. Method according to any one of claims 4-6, characterised in that the phosphorus content in the hot strip is < 0.08 % by weight.
  8. Method according to any one of claims 4-7, characterised in that during the rolling in the ferrite area at least the last rolling pass is carried out with lubrication.
  9. Method for producing non-grain oriented electrical sheet from a hot strip composed according to any one of claims 1 to 3 and produced according to any one of claims 4 to 12, comprising the following working steps:
    pickling or annealing and pickling of the hot strip,
    cold-rolling of the hot strip,
    intermediate annealing of the cold strip,
    final annealing or
    annealing with subsequent deformation with a total degree of deformation of less than 20%.
  10. Method according to claim 9, characterised in that the cold-rolling is carried out in at least two stages with an intermediate annealing.
EP02779503A 2001-10-31 2002-10-23 Hot-rolled steel strip provided for producing non grain-oriented electrical sheet, and method for the production thereof Expired - Lifetime EP1440173B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10153234 2001-10-31
DE10153234A DE10153234A1 (en) 2001-10-31 2001-10-31 Hot-rolled steel strip intended for the production of non-grain-oriented electrical sheet and method for its production
PCT/EP2002/011822 WO2003038135A1 (en) 2001-10-31 2002-10-23 Hot-rolled steel strip provided for producing non grain-oriented electrical sheet, and method for the production thereof

Publications (2)

Publication Number Publication Date
EP1440173A1 EP1440173A1 (en) 2004-07-28
EP1440173B1 true EP1440173B1 (en) 2005-10-05

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EP02779503A Expired - Lifetime EP1440173B1 (en) 2001-10-31 2002-10-23 Hot-rolled steel strip provided for producing non grain-oriented electrical sheet, and method for the production thereof

Country Status (10)

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US (1) US7658807B2 (en)
EP (1) EP1440173B1 (en)
JP (1) JP2005507458A (en)
KR (1) KR100951462B1 (en)
CN (1) CN1302131C (en)
AT (1) ATE305983T1 (en)
DE (2) DE10153234A1 (en)
ES (1) ES2249622T3 (en)
PL (1) PL205577B1 (en)
WO (1) WO2003038135A1 (en)

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Publication number Priority date Publication date Assignee Title
US20100215981A1 (en) * 2009-02-20 2010-08-26 Nucor Corporation Hot rolled thin cast strip product and method for making the same
DE102012002642B4 (en) 2012-02-08 2013-08-14 Salzgitter Flachstahl Gmbh Hot strip for producing an electric sheet and method for this
TWI504760B (en) * 2012-11-07 2015-10-21 Jfe Steel Corp Steel sheet for 3-piece can and manufacturing method thereof
WO2015170271A1 (en) 2014-05-08 2015-11-12 Centro Sviluppo Materiali S.P.A. Process for the production of grain non- oriented electric steel strip, with an high degree of cold reduction
KR102364477B1 (en) 2016-07-29 2022-02-16 잘쯔기터 플래시슈탈 게엠베하 Steel strip for producing non-oriented electrical steel and method for producing such steel strip
KR101917468B1 (en) * 2016-12-23 2018-11-09 주식회사 포스코 Thin hot-rolled electrical steel sheets and method for manufacturing the same
KR102109240B1 (en) * 2017-12-24 2020-05-11 주식회사 포스코 Hot-rolled steel sheet for non-oriented electrical steel sheet, non-oriented electrical steel sheet and method for manufacturing the same
KR102045653B1 (en) * 2017-12-26 2019-11-15 주식회사 포스코 Non-oriented electrical steel sheet having low deviation of mechanical property and thickness and method of manufacturing the same
KR102109241B1 (en) * 2017-12-26 2020-05-11 주식회사 포스코 Non-oriented electrical steel sheet having excellent shape property and method of manufacturing the same
CN112840041B (en) * 2018-10-15 2023-01-06 蒂森克虏伯钢铁欧洲股份公司 Method for producing an electrical NO tape with intermediate thickness
WO2020094230A1 (en) 2018-11-08 2020-05-14 Thyssenkrupp Steel Europe Ag Electric steel strip or sheet for higher frequency electric motor applications, with improved polarisation and low magnetic losses

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DE19930519C1 (en) * 1999-07-05 2000-09-14 Thyssenkrupp Stahl Ag Non-textured electrical steel sheet, useful for cores in rotary electrical machines such as motors and generators, is produced by multi-pass hot rolling mainly in the two-phase austenite-ferrite region
JPH07115041B2 (en) * 1987-03-11 1995-12-13 日本鋼管株式会社 Method for manufacturing non-oriented high Si steel sheet
CN1047207C (en) * 1994-06-24 1999-12-08 新日本制铁株式会社 Method of manufacturing non-oriented electromagnetic steel plate having high magnetic flux density and low iron loss
DE19710125A1 (en) * 1997-03-13 1998-09-17 Krupp Ag Hoesch Krupp Process for the production of a steel strip with high strength and good formability
DE19807122C2 (en) 1998-02-20 2000-03-23 Thyssenkrupp Stahl Ag Process for the production of non-grain oriented electrical sheet
DE19840788C2 (en) * 1998-09-08 2000-10-05 Thyssenkrupp Stahl Ag Process for producing cold-rolled strips or sheets
DE19918484C2 (en) * 1999-04-23 2002-04-04 Ebg Elektromagnet Werkstoffe Process for the production of non-grain oriented electrical sheet
JP2001123225A (en) * 1999-10-27 2001-05-08 Nippon Steel Corp Method for producing hot rolled silicon steel sheet high in magnetic flux density and low in core loss
DE10015691C1 (en) 2000-03-16 2001-07-26 Thyssenkrupp Stahl Ag Production of a non-grain oriented hot-rolled magnetic steel sheet used in the production of engines comprises rolling a pre-material made of an iron alloy and deforming in the mixed austenite/ferrite region
WO2003002777A1 (en) * 2001-06-28 2003-01-09 Jfe Steel Corporation Nonoriented electromagnetic steel sheet
RU2318883C2 (en) * 2002-05-08 2008-03-10 Эй-Кей СТИЛ ПРОПЕРТИЗ ИНК Non-oriented electrical steel strip continuous casting method

Also Published As

Publication number Publication date
WO2003038135A1 (en) 2003-05-08
EP1440173A1 (en) 2004-07-28
US20050067053A1 (en) 2005-03-31
KR100951462B1 (en) 2010-04-07
ES2249622T3 (en) 2006-04-01
US7658807B2 (en) 2010-02-09
PL205577B1 (en) 2010-05-31
CN1578842A (en) 2005-02-09
KR20050039725A (en) 2005-04-29
ATE305983T1 (en) 2005-10-15
JP2005507458A (en) 2005-03-17
DE50204488D1 (en) 2006-02-16
CN1302131C (en) 2007-02-28
DE10153234A1 (en) 2003-05-22
PL369257A1 (en) 2005-04-18

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