WO2021037780A1 - Method for producing a cold-rolled si-alloyed electric strip having a cold strip thickness dkb < 1 mm from a steel precursor - Google Patents
Method for producing a cold-rolled si-alloyed electric strip having a cold strip thickness dkb < 1 mm from a steel precursor Download PDFInfo
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- WO2021037780A1 WO2021037780A1 PCT/EP2020/073595 EP2020073595W WO2021037780A1 WO 2021037780 A1 WO2021037780 A1 WO 2021037780A1 EP 2020073595 W EP2020073595 W EP 2020073595W WO 2021037780 A1 WO2021037780 A1 WO 2021037780A1
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Classifications
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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
- 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
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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
- 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
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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
- 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
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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
- 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
- C21D8/1261—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 following hot rolling
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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%
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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
- C22C38/02—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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Definitions
- the invention relates to a method for producing a cold-rolled electrical steel strip with a cold-rolled strip thickness d kb ⁇ 1 mm from a steel precursor.
- the cold formability of this group of materials is limited by their brittle behavior.
- the finished electrical steel strip must have a particularly small strip thickness, which is typically ⁇ 0.30 mm. Therefore, the task for the production of particularly thin cold strips (d kb ⁇ 0.25 mm) is to provide thin hot strips (d Wb ⁇ 1.80 mm) as the starting material.
- the inhomogeneity of the hot strip is also passed on to the final structure in the fully annealed cold strip and limits the attainability of optimal magnetic parameters.
- the thin hot strips with TEW ⁇ 900 ° C have to be annealed with an inhomogeneous microstructure. This hot strip annealing is independent of the final rolling temperature selected for hot rolling.
- the object to be achieved by the invention is to provide a method for producing a cold-rolled electrical steel strip with a cold-rolled strip thickness d kb ⁇ 1 mm from a steel pre-product via an optimized combination of final rolling temperature in the hot rolling mill and hot-strip annealing.
- the object is achieved by the method according to the invention with the features of main claim 1.
- the hot strip thickness dw b of a hot strip before cold rolling is dw b ⁇ 1.80 mm and the final rolling temperature TEW during hot rolling of the hot strip is set to TEW ⁇ 900 ° C.
- a continuous hot strip annealing takes place in a furnace with a rapid heating device.
- the hot strip in the furnace is brought to a strip temperature of at least 700 ° C within a maximum of 5 seconds and then held at a temperature of 900 ° C - 950 ° C for at least 30 s.
- a hot strip with dw b ⁇ 1.80 mm and slight differences in the structure can be rolled at rolling speeds in the stable production range of a rolling train.
- the subsequent continuous hot strip annealing and the rapid heating device installed in the furnace allow the properties of the thin hot strip necessary for the production of the cold strip to be optimally adjusted.
- the final rolling temperature of the hot rolling is set to TEW ⁇ 750 ° C. This allows the
- the preheating temperature of an inserted slab can be further reduced and, in addition to further optimization of the microstructure, the hot strip surface can also be improved.
- the annealed hot strip is pickled. This improves the quality of the hot strip surface and the resulting cold strip surface.
- a slab with a thickness of 60 mm is rolled into a thin hot strip with the following parameters: 1. A slab temperature before piercing in the first hot rolling stand of
- the electrical strips produced in this way have the necessary properties in accordance with the corresponding international standards
Abstract
The invention relates to a method for producing a cold-rolled electric strip having cold strip thickness dkb < 1 mm from a steel precursor.
Description
Verfahren zur Herstellung eines kaltgewalzten Si-Iegierten Elektrobandes mit einer Kaltbanddicke dkb < 1 mm aus einem Stahlvorprodukt Gebiet: Process for the production of a cold-rolled Si-alloyed electrical steel strip with a cold-rolled strip thickness d kb <1 mm from a steel pre-product area:
Die Erfindung betrifft ein Verfahren zur Herstellung eines kaltgewalzten Elektrobandes mit einer Kaltbanddicke dkb < 1 mm aus einem Stahlvorprodukt. The invention relates to a method for producing a cold-rolled electrical steel strip with a cold-rolled strip thickness d kb <1 mm from a steel precursor.
Stand der Technik: Für die Herstellung von Bändern aus Si-Iegiertem Stahl mit einer Dicke dkb < 1 mm sind unterschiedlichen Verfahrensrouten bekannt. Typischerweise wird eine Bramme oder Dünnbramme in einem mehrstufigen Warmwalzprozess zu einem Warmband gewalzt. Anschließend wird das Warmband kontinuierlich oder diskontinuierlich vor einem ersten Anstich in einem Kaltwalzwerk geglüht. Im Kaltwalzwerk wird das Warmband ebenfalls in einem mehrstufigen Walzprozess zu einem Kaltband gewalzt und anschließend erneut einer Glühung unterzogen. Prozessparameter für derartige Verfahren sind beispielsweise in der DE 199 18 484 A1 oder WO 2016/063 118 A1 offenbart. Elektrobänder erreichen optimale magnetische Eigenschaften, wenn der Umformgrad im Kaltwalzwerk 85 % nicht übersteigt. Weiterhin wird die Kaltumformbarkeit dieser Werkstoffgruppe durch ihr sprödes Verhalten begrenzt. Aus physikalischen Gründen muss das fertige Elektroband eine besonders geringe Banddicke aufweisen, welche typischerweise < 0,30 mm beträgt. Daher besteht die Aufgabe für die Herstellung besonders dünner Kaltbänder (dkb < 0,25 mm) dünne Warmbänder (dWb < 1 ,80 mm) als Ausgangsmaterial bereitzustellen. State of the art: Different process routes are known for the production of strips made of Si-alloyed steel with a thickness d kb <1 mm. Typically, a slab or thin slab is rolled into a hot strip in a multi-stage hot rolling process. The hot strip is then annealed continuously or discontinuously in a cold rolling mill before the first pass. In the cold rolling mill, the hot strip is also rolled into a cold strip in a multi-stage rolling process and then subjected to another annealing process. Process parameters for such methods are disclosed, for example, in DE 199 18 484 A1 or WO 2016/063 118 A1. Electrical strips achieve optimal magnetic properties if the degree of deformation in the cold rolling mill does not exceed 85%. Furthermore, the cold formability of this group of materials is limited by their brittle behavior. For physical reasons, the finished electrical steel strip must have a particularly small strip thickness, which is typically <0.30 mm. Therefore, the task for the production of particularly thin cold strips (d kb <0.25 mm) is to provide thin hot strips (d Wb <1.80 mm) as the starting material.
Beim Warmwalzen dieser dünnen Warmbänder aus einer Bramme oder Dünnbramme in einem Warmwalzwerk fällt die Endwalztemperatur TEW üblicherweise unter TEW = 900°C, was in der Folge zu einer inhomogenen Gefügestruktur über den Querschnitt des Warmbandes führt. Die Bandoberfläche
weist nach dem Erkalten starke Anteile nicht feinkörniger, rekristallisierter Gefügestrukturen auf und der Kern dagegen ist von einer stark grobkörnigen und zeiligen Gefügestruktur gekennzeichnet. Solche inhomogenen Gefüge lassen sich nur schwer kaltwalzen. Die Inhomogenität des Warmbandes vererbt sich ebenso auf das Endgefüge im fertig geglühten Kaltband und schränkt die Erreichbarkeit optimaler magnetischer Kennwerte ein. When hot rolling these thin hot strips from a slab or thin slab in a hot rolling mill, the final rolling temperature TEW usually falls below TEW = 900 ° C, which consequently leads to an inhomogeneous microstructure over the cross section of the hot strip. The belt surface After cooling, it shows strong proportions of non-fine-grained, recrystallized microstructures and the core, on the other hand, is characterized by a very coarse-grained and linear microstructure. Such inhomogeneous structures are difficult to cold-roll. The inhomogeneity of the hot strip is also passed on to the final structure in the fully annealed cold strip and limits the attainability of optimal magnetic parameters.
Bei einer herkömmlichen Warmwalzweise wird versucht, durch Anhebung der Endwalztemperatur, Walzbedingungen einzustellen, bei denen diese inhomogen Gefügestruktur weniger ausgeprägt ist. Dies wird üblicherweise dadurch erreicht, dass die Walzgeschwindigkeiten im Warmwalzprozess erhöht oder die Brammentemperatur vor dem ersten Anstich im Warmwalzgerüst erhöht werden. In a conventional hot rolling process, an attempt is made, by increasing the final rolling temperature, to set rolling conditions in which this inhomogeneous microstructure is less pronounced. This is usually achieved by increasing the rolling speed in the hot rolling process or by increasing the slab temperature before the first piercing in the hot rolling stand.
Bei zu hohen Endwalzgeschwindigkeiten können aber instabile Verhältnisse in der Warmwalzstraße entstehen, die negative Auswirkungen auf die Bandqualität haben können. Hohe Anstichtemperaturen benötigen entsprechend mehr Energie im Vorwärmofen und / oder können durch vermehrte Zunderbildung die Oberfläche der Bramme schädigen bzw. das mengenmäßige Ausbringen verschlechtern. If the final rolling speed is too high, however, unstable conditions can arise in the hot rolling mill, which can have negative effects on the strip quality. High piercing temperatures require correspondingly more energy in the preheating furnace and / or can damage the surface of the slab or worsen the quantitative output due to increased scale formation.
Um die Nachteile in den bekannten Produktionsprozessen zu vermeiden, müssen die dünnen Warmbänder mit TEW < 900°C mit einer inhomogenen Gefügestruktur geglüht werden. Diese Warmbandglühung ist unabhängig von der beim Warmwalzen gewählten Endwalztemperatur. In order to avoid the disadvantages in the known production processes, the thin hot strips with TEW <900 ° C have to be annealed with an inhomogeneous microstructure. This hot strip annealing is independent of the final rolling temperature selected for hot rolling.
Aufgabe der Erfindung: Object of the invention:
Die durch die Erfindung zu lösende Aufgabe besteht darin, ein Verfahren zur Herstellung eines kaltgewalzten Elektrobandes mit einer Kaltbanddicke dkb < 1 mm aus einem Stahlvorprodukt über eine optimierte Kombination aus Endwalztemperatur im Warmwalzwerk und Warmbandglühung bereitzustellen.
Erfindung: The object to be achieved by the invention is to provide a method for producing a cold-rolled electrical steel strip with a cold-rolled strip thickness d kb <1 mm from a steel pre-product via an optimized combination of final rolling temperature in the hot rolling mill and hot-strip annealing. Invention:
Die Aufgabe wird durch das erfindungsgemäße Verfahren mit den Merkmalen des Hauptanspruchs 1 gelöst. Die Warmbanddicke dwb eines Warmbandes vor dem Kaltwalzen beträgt dwb < 1,80 mm und die Endwalztemperatur TEW bei dem Warmwalzen des Warmbandes wird auf TEW ^ 900°C eingestellt. Vor dem Kaltwalzen erfolgt eine kontinuierliche Warmbandglühung in einem Ofen, aufweisend eine Schneilaufheizvorrichtung. Dabei wird das Warmband in dem Ofen mit der Schneilaufheizvorrichtung innerhalb von maximal 5 Sekunden auf eine Bandtemperatur von mindestens 700°C gebracht und anschließend mindestens 30 s bei einer Temperatur von 900°C - 950°C gehalten. The object is achieved by the method according to the invention with the features of main claim 1. The hot strip thickness dw b of a hot strip before cold rolling is dw b <1.80 mm and the final rolling temperature TEW during hot rolling of the hot strip is set to TEW ^ 900 ° C. Before the cold rolling, a continuous hot strip annealing takes place in a furnace with a rapid heating device. The hot strip in the furnace is brought to a strip temperature of at least 700 ° C within a maximum of 5 seconds and then held at a temperature of 900 ° C - 950 ° C for at least 30 s.
Durch die deutlich geringere Endwalztemperatur im Warmwalzprozess gegenüber dem Stand der Technik kann mit Walzgeschwindigkeiten im stabilen Produktionsbereich einer Walzstraße ein Warmband mit dwb < 1 ,80 mm und geringen Unterschieden in der Gefügestruktur gewalzt werden. Durch die anschließende kontinuierliche Warmbandglühung und die in dem Ofen angebrachte Schneilaufheizeinrichtung können die für die Produktion des Kaltbandes notwendigen Eigenschaften des dünnen Warmbandes optimal eingestellt werden. Due to the significantly lower final rolling temperature in the hot rolling process compared to the prior art, a hot strip with dw b <1.80 mm and slight differences in the structure can be rolled at rolling speeds in the stable production range of a rolling train. The subsequent continuous hot strip annealing and the rapid heating device installed in the furnace allow the properties of the thin hot strip necessary for the production of the cold strip to be optimally adjusted.
Gemäß dem Unteranspruch 2 ist es bevorzugt, wenn die Endwalztemperatur des Warmwalzens auf TEW ^ 750°C eingestellt wird. Dadurch kann dieAccording to dependent claim 2, it is preferred if the final rolling temperature of the hot rolling is set to TEW ^ 750 ° C. This allows the
Vorwärmtemperatur einer eingesetzten Bramme weiter abgesenkt werden und neben einer weiteren Optimierung der Gefügestruktur auch die Warmbandoberfläche verbessert werden. The preheating temperature of an inserted slab can be further reduced and, in addition to further optimization of the microstructure, the hot strip surface can also be improved.
Weiterhin ist es gemäß dem Unteranspruch 3 vorteilhaft, wenn das geglühte Warmband gebeizt wird. Dadurch wird die Qualität der Warmbandoberfläche und der daraus entstehenden Kaltbandoberfläche verbessert.
Beispielsweise wird in einer mehrgerüstigen Warmwalzstraße mit einer erlaubten Walzgeschwindigkeit von maximal 11 m/s eine Bramme mit einer Dicke von 60 mm mit den folgenden Parametern zu einem dünnen Warmband gewalzt: 1. Eine Brammentemperatur vor Anstich im ersten Warmwalzgerüst vonFurthermore, according to dependent claim 3, it is advantageous if the annealed hot strip is pickled. This improves the quality of the hot strip surface and the resulting cold strip surface. For example, in a multi-stand hot rolling mill with a permitted rolling speed of a maximum of 11 m / s, a slab with a thickness of 60 mm is rolled into a thin hot strip with the following parameters: 1. A slab temperature before piercing in the first hot rolling stand of
TBG = 1 150°0 ergibt eine Endwalztemperatur TEW = 750°C bei einer Warmbanddicke dWb = 1 ,2 mm und einer Endwalzgeschwindigkeit Vew = 5,8 m/s bis vew = 8,8 m/s. 2. Eine Brammentemperatur vor Anstich im ersten Warmwalzgerüst vonTB G = 1150 ° 0 results in a final rolling temperature TEW = 750 ° C with a hot strip thickness d Wb = 1.2 mm and a final rolling speed Vew = 5.8 m / s to v ew = 8.8 m / s. 2. A slab temperature before the first hot rolling stand of
TBG = 1050°0 ergibt eine Endwalztemperatur TEW = 750°C bei einer Warmbanddicke dWb = 1 ,2 mm und einer Endwalzgeschwindigkeit Vew = 6,0 m/s bis vew = 9,0 m/s. 3. Eine Brammentemperatur vor Anstich im ersten Warmwalzgerüst vonTB G = 1050 ° 0 results in a final rolling temperature TEW = 750 ° C with a hot strip thickness d Wb = 1.2 mm and a final rolling speed Vew = 6.0 m / s to v ew = 9.0 m / s. 3. A slab temperature before the first hot rolling stand of
TBG = 1050°0 ergibt eine Endwalztemperatur TEW = 790°C bei einer Warmbanddicke dWb = 1,2 mm Endwalzgeschwindigkeitsunabhängig. TB G = 1050 ° 0 results in a final rolling temperature TEW = 790 ° C with a hot strip thickness d Wb = 1.2 mm, regardless of the final rolling speed.
Die beispielhaften Warmbänder 1. bis 3. werden in einem darauffolgenden Herstellungsprozess gemäß dem Stand der Technik zu Elektrobändern mit einer Dicke von dkb = 0,20 mm verarbeitet. Die derart hergestellten Elektrobänder weisen die notwendigen Eigenschaften gemäß entsprechender internationaler Standards
The exemplary hot strips 1 to 3 are processed into electrical strips with a thickness of d kb = 0.20 mm in a subsequent production process in accordance with the prior art. The electrical strips produced in this way have the necessary properties in accordance with the corresponding international standards
Claims
1. Verfahren zur Herstellung eines kaltgewalzten Elektrobandes mit einer Kaltbanddicke dkb < 1 mm aus einem Stahlvorprodukt aufweisend die Legierungsbestandteile (in Gew.-%): 1. Process for the production of a cold-rolled electrical steel strip with a cold-rolled strip thickness d kb <1 mm from a steel precursor having the alloy components (in% by weight):
- Si > 1 ,8 % - Si> 1.8%
- AI > 0,5 % - AI> 0.5%
- C < 50 ppm - C <50 ppm
- N < 40 ppm - N <40 ppm
- S < 30 ppm - S <30 ppm
- Mn 0,060 % bis 0,500 % - Mn 0.060% to 0.500%
- Summe aus den Legierungsbestandteilen Si und AI < 4,6 %- Sum of the alloy components Si and AI <4.6%
- eines oder mehrere der Elemente Cu, Ni, Mo, Cr, Sn, Sb mit jeweils < 0,100 %, - one or more of the elements Cu, Ni, Mo, Cr, Sn, Sb with <0.100% each,
- sowie Rest Eisen (Fe) und unvermeidbare Verunreinigungen, gekennzeichnet durch mindestens einen Warmwalzschritt und mindestens einen Kaltwalzschritt wobei - as well as the remainder iron (Fe) and unavoidable impurities, characterized by at least one hot rolling step and at least one cold rolling step where
- ein Warmwalzen des Stahlvorproduktes zu einem Warmband erfolgt, und die Warmbanddicke das 8-fache der gewünschten Kaltbanddicke nicht übersteigt; - The steel pre-product is hot-rolled to form a hot strip, and the hot strip thickness does not exceed 8 times the desired cold strip thickness;
- ein Erwärmen des Stahlvorproduktes auf maximal TBg = 1200°C vor einem Anstich im Walzgerüst während des Warmwalzens begrenzt wird; das Warmband vor dem Kaltwalzen einer kontinuierlichen Warmbandglühung unterzogen wird;
- das Warmband bei der kontinuierlichen Warmbandglühung bis auf eine Zieltemperatur von 900°C - 1 000°C erwärmt wird; dadurch gekennzeichnet, dass - A heating of the steel precursor is limited to a maximum of TB g = 1200 ° C before a piercing in the roll stand during hot rolling; the hot strip is subjected to continuous hot strip annealing before cold rolling; - The hot strip is heated up to a target temperature of 900 ° C - 1,000 ° C during continuous hot strip annealing; characterized in that
- die Warmbanddicke vor dem Kaltwalzen dwb < 1 ,80 mm ist; - die Endwalztemperatur des Warmwalzens auf TEW ^ 800°C eingestellt wird; - The hot strip thickness before cold rolling is dw b <1.80 mm; - the final rolling temperature of hot rolling is set to TEW ^ 800 ° C;
- die kontinuierliche Warmbandglühung in einem Ofen, aufweisend eine Schneilaufheizvorrichtung, erfolgt; - The continuous hot strip annealing takes place in a furnace, having a Schneilaufheizvorrichtung;
- das Warmband in dem Ofen mit Schneilaufheizvorrichtung innerhalb von maximal 5 Sekunden auf eine Bandtemperatur von mindestens- the hot strip in the furnace with a rapid heating device to a strip temperature of at least 5 seconds
700°C gebracht wird; 700 ° C is brought;
- das Warmband bei der kontinuierlichen Warmbandglühung mindestens 30 s bei einer Temperatur von 900°C - 1.000°C gehalten wird. - the hot strip is held at a temperature of 900 ° C - 1,000 ° C for at least 30 s during continuous hot strip annealing.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Endwalztemperatur des Warmwalzens auf TEW ^ 750°C eingestellt wird. 2. The method according to claim 1, characterized in that the final rolling temperature of the hot rolling is set to TEW ^ 750 ° C.
3. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, das das geglühte Warmband gebeizt wird.
3. The method according to any one of the preceding claims, characterized in that the annealed hot strip is pickled.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019213135 | 2019-08-30 | ||
| DE102019213135.2 | 2019-08-30 | ||
| DE102019217491.4 | 2019-11-13 | ||
| DE102019217491.4A DE102019217491A1 (en) | 2019-08-30 | 2019-11-13 | Process for the production of a cold-rolled Si-alloyed electrical steel strip with a cold-rolled strip thickness dkb <1 mm from a steel precursor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021037780A1 true WO2021037780A1 (en) | 2021-03-04 |
Family
ID=74565607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2020/073595 WO2021037780A1 (en) | 2019-08-30 | 2020-08-24 | Method for producing a cold-rolled si-alloyed electric strip having a cold strip thickness dkb < 1 mm from a steel precursor |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102019217491A1 (en) |
| WO (1) | WO2021037780A1 (en) |
Citations (7)
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|---|---|---|---|---|
| DE19918484A1 (en) | 1999-04-23 | 2000-10-26 | Ebg Elektromagnet Werkstoffe | Non-grain-oriented electrical steel sheets are produced using a wide range of steel starting materials and a wide range of hot rolling, coiling, pickling, cold rolling and final treatment parameters |
| CN101684514A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | Method for manufacturing a highly effective cold rolling electrical steel product |
| WO2016063118A1 (en) | 2014-10-20 | 2016-04-28 | Arcelormittal | Method of production of tin containing non grain-oriented silicon steel sheet, steel sheet obtained and use thereof |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
| EP3428293A1 (en) * | 2016-03-09 | 2019-01-16 | JFE Steel Corporation | Method for manufacturing grain-oriented electrical steel sheet |
| US20190228891A1 (en) * | 2016-08-05 | 2019-07-25 | Nippon Steel & Sumitomo Metal Corporation | Non-oriented electrical steel sheet, manufacturing method of non-oriented electrical steel sheet, and manufacturing method of motor core |
| EP3530762A1 (en) * | 2016-10-19 | 2019-08-28 | JFE Steel Corporation | HOT-ROLLED-SHEET ANNEALING EQUIPMENT FOR Si-CONTAINING HOT-ROLLED STEEL SHEET, METHOD FOR HOT-ROLLED-SHEET ANNEALING, AND DESCALING METHOD |
-
2019
- 2019-11-13 DE DE102019217491.4A patent/DE102019217491A1/en not_active Withdrawn
-
2020
- 2020-08-24 WO PCT/EP2020/073595 patent/WO2021037780A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19918484A1 (en) | 1999-04-23 | 2000-10-26 | Ebg Elektromagnet Werkstoffe | Non-grain-oriented electrical steel sheets are produced using a wide range of steel starting materials and a wide range of hot rolling, coiling, pickling, cold rolling and final treatment parameters |
| CN101684514A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | Method for manufacturing a highly effective cold rolling electrical steel product |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
| WO2016063118A1 (en) | 2014-10-20 | 2016-04-28 | Arcelormittal | Method of production of tin containing non grain-oriented silicon steel sheet, steel sheet obtained and use thereof |
| US20170314087A1 (en) * | 2014-10-20 | 2017-11-02 | Arcelormittal | Method of production of tin containing non grain-oriented silicon steel sheet , steel sheet obtained and use thereof |
| EP3428293A1 (en) * | 2016-03-09 | 2019-01-16 | JFE Steel Corporation | Method for manufacturing grain-oriented electrical steel sheet |
| US20190228891A1 (en) * | 2016-08-05 | 2019-07-25 | Nippon Steel & Sumitomo Metal Corporation | Non-oriented electrical steel sheet, manufacturing method of non-oriented electrical steel sheet, and manufacturing method of motor core |
| EP3530762A1 (en) * | 2016-10-19 | 2019-08-28 | JFE Steel Corporation | HOT-ROLLED-SHEET ANNEALING EQUIPMENT FOR Si-CONTAINING HOT-ROLLED STEEL SHEET, METHOD FOR HOT-ROLLED-SHEET ANNEALING, AND DESCALING METHOD |
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