DE10060948C2 - Process for producing a hot strip from a steel with a high manganese content - Google Patents
Process for producing a hot strip from a steel with a high manganese contentInfo
- Publication number
- DE10060948C2 DE10060948C2 DE10060948A DE10060948A DE10060948C2 DE 10060948 C2 DE10060948 C2 DE 10060948C2 DE 10060948 A DE10060948 A DE 10060948A DE 10060948 A DE10060948 A DE 10060948A DE 10060948 C2 DE10060948 C2 DE 10060948C2
- Authority
- DE
- Germany
- Prior art keywords
- strip
- hot strip
- hot
- steel
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 21
- 239000011572 manganese Substances 0.000 title abstract description 10
- 229910052748 manganese Inorganic materials 0.000 title abstract description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 30
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract 2
- 238000001816 cooling Methods 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 13
- 238000007711 solidification Methods 0.000 description 9
- 230000008023 solidification Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
- C21D8/0215—Rapid solidification; Thin strip casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Erzeugen eines Warmbandes aus einem einen hohen, mehr als 12 bis 30 Gew.-% betragenden Mangan-Gehalt aufweisenden Stahl. Stähle dieser Art zeichnen sich durch besonders hohe Festigkeit aus.The invention relates to a method for generating a Hot strip from a high, more than 12 to 30 wt .-% steel with a manganese content. Steels of this type are particularly high Strength.
Ein Problem bei der Herstellung und Verarbeitung von Stählen, die derart hohe Mangan-Gehalte aufweisen, besteht darin, daß sie ein Erstarrungsverhalten aufweisen, welches sich von den üblichen, für Tiefziehanwendungen bestimmten Stählen, wie IF- oder Low- Carbon-Stählen, unterscheidet. So zeigt sich, daß im konventionellen Brammenstrangguß vergossene, hoch manganhaltige Stähle der in Rede stehenden Art ein schlechtes Umformverhalten aufweisen.A problem in the manufacture and processing of Steels with such high manganese contents is that they have a freezing behavior have, which differs from the usual for Deep-drawing applications of certain steels, such as IF or low Carbon steels. This shows that in conventional slab casting cast, high manganese-containing steels of the type in question have poor forming behavior.
Gemäß einem aus der DE 199 00 199 A1 bekannten Verfahren lassen sich Stähle, die neben anderen Legierungselementen 7% bis 27% Mn enthalten, durch Dünnbandgießen als endabmessungsnahes Band erzeugen und zu Warmband verarbeiten. Das so erhaltene Material eignet sich in besonderer Weise für die Anwendung im Bereich des Automobil-Karosseriebaus.According to a method known from DE 199 00 199 A1 can be steels, alongside other alloying elements Contain 7% to 27% Mn, by thin strip casting as Produce strip close to the final dimension and hot strip to process. The material thus obtained is suitable in special way for application in the field of Automotive body shop.
Die Aufgabe der Erfindung besteht darin, ein Verfahren anzugeben, welches die Erzeugung von Stahlbändern ermöglicht, die trotz eines hohen Mangan-Gehaltes ein gutes Umformverhalten besitzen.The object of the invention is a method indicate which is the production of steel strips enables that despite a high manganese content have good forming behavior.
Diese Aufgabe wird durch ein Verfahren zum Erzeugen eines TWIN- und TRIP-Eigenschaften aufweisenden Warmbandes aus einem mehr als 12 bis 30 Gew.-% Mangan enthaltenden Stahl gelöst, bei dem eine Schmelze in einer Zwei-Rollen- Gießmaschine endabmessungsnah zu einem Vorband mit einer Dicke von bis zu 6 mm vergossen wird, welches im Anschluß an das Gießen kontinuierlich zu Warmband weiterverarbeitet wird, indem es in einem einzigen Warmwalzstich auf die Enddicke des Warmbands gewalzt wird.This task is accomplished by a method for generating a Hot strip with TWIN and TRIP properties a steel containing more than 12 to 30% by weight of manganese solved in which a melt in a two-roll Casting machine close to the final dimensions of a supporting strip with a Thickness of up to 6 mm is shed, which in the connection casting continuously to hot strip is processed by being in a single Hot roll pass rolled to the final thickness of the hot strip becomes.
Gemäß der Erfindung wird hoch-manganhaltiger Stahl zu einem Vormaterial vergossen, dessen Abmessungen den Endabmessungen des Warmbandes angenähert sind. Auf diese Weise wird schon im Gießprozeß ein derart dünnes Material erzeugt, daß eine im wesentlichen gleichmäßige Erstarrung über seinen gesamten Querschnitt sichergestellt ist. Überraschend hat sich gezeigt, daß das derart endabmessungsnah vergossene Vormaterial ein wesentlich feinkörnigeres, gleichmäßigeres Gefüge aufweist als auf konventionellem Wege erzeugtes Stahlband mit einem vergleichbar hohen Mangan-Gehalt. Das aus dem Vormaterial erzeugte Warmband besitzt TRIP ("Transformation-Induced- Plasticity")- und TWIP ("Twinning-Induced-Plasticity")- Eigenschaften und weist dementsprechend eine gute Umformbarkeit auf, welche es in Kombination mit der hohen Festigkeit in besonderer Weise für die Verwendung im Karosseriebau geeignet macht. According to the invention, high manganese steel becomes shed a material, the dimensions of which Final dimensions of the hot strip are approximated. To this Such a thin material becomes wise already in the casting process produces a substantially uniform solidification is ensured over its entire cross-section. Surprisingly, it has been shown that this is the case Poured primary material close to the final dimensions is essential has a more fine-grained, more even structure than Steel strip with a conventional way comparable high manganese content. That from the primary material generated hot strip has TRIP ("Transformation-Induced- Plasticity "- and TWIP (" Twinning-Induced-Plasticity ") - Properties and accordingly has a good Formability on which it is combined with the high Strength in a special way for use in Makes body construction suitable.
Erfindungsgemäß sollte die Dicke des erzeugten Materials möglichst gering sein. Je dünner das gegossene Vormaterial ist, desto feiner ist das Erstarrungsgefüge und desto weniger können erstarrungsbedingte Fehler die Weiterverarbeitung zu Warmband stören. Gleichzeitig läßt sich bei einem dünnen gegossenen Vorprodukt der Vorgang der Erstarrung auf einfache Weise gezielt steuern. So kann in einem kontrollierten Vorgang dem Umstand Rechnung getragen werden, daß insbesondere bei Stählen der hier in Rede stehenden Art die Erstarrungsgeschwindigkeit unmittelbaren Einfluß auf die Höhe und die Verteilung von Mikroseigerungen hat. Diese beeinflussen wiederum das Kornwachstum und den Zustand der im Zuge der Erstarrung auftretenden Ausscheidungen, wie MnS, AlN und Ti(C, N). Durch die gezielte Steuerung der Gefügeparameter des gegossenen Vormaterials können somit die Grundlagen eingestellt werden, welche die Weiterverarbeitbarkeit und die Gebrauchseigenschaften des Endprodukts entscheidend beeinflussen.According to the thickness of the material produced be as low as possible. The thinner the cast The primary material is, the finer the solidification structure and the fewer errors caused by solidification Disrupt further processing to hot strip. Leaves at the same time the process for a thin cast intermediate product Controlling solidification in a simple way. So can take the circumstance into account in a controlled process be worn that especially in steels here in Kind of the speed of solidification direct influence on the amount and distribution of Has micro segregations. These in turn influence that Grain growth and the state of solidification excretions occurring, such as MnS, AlN and Ti (C, N). Through the targeted control of the structural parameters of the cast primary material can thus the basics be set, which the further processability and the usage properties of the end product are decisive influence.
Das Vergießen des Stahles erfolgt erfindungsgemäß in einer Zwei-Rollen-Gießmaschine. Dieser an sich bekannte Gießmaschinentyp ermöglicht es, besonders dünnes, der endgültigen Abmessung des Warmbandes stark angenähertes Vormaterial zu erzeugen, dessen Erstarrungsverhalten, insbesondere seine Erstarrungsgeschwindigkeit und -gleichmäßigkeit zu einem optimalen Gußgefüge und damit einhergehend zu einer optimierten Umformbarkeit führt.The steel is cast according to the invention in a two-roll casting machine. This known per se Casting machine type allows, particularly thin, the final dimension of the hot strip is very close To produce primary material, its solidification behavior, in particular its rate of solidification and - Uniformity to an optimal casting structure and thus accompanied by an optimized formability.
Überraschend hat sich gezeigt, daß sich dadurch, daß aus dem Vorband in nur einem einzigen Stich ein Warmband auf Enddicke gewalzt wird, besonders gute Arbeitsergebnisse erzielen lassen. Die unmittelbare, kontinuierliche Aufeinanderfolge von Gießprozeß und des in einem Stich erfolgenden Warmwalzens ermöglicht es, die Hitze des Gießprozesses in den Walzprozeß mitzunehmen, so daß der bei konventionellem Brammenguß stets erforderliche Schritt der Wiedererwärmung vor dem Warmwalzen vermieden werden kann. Die "Mitnahme" der Gießhitze vermeidet zudem ein übermäßiges Kristallwachstum und unterstützt so zusätzlich die Ausbildung eines feinen Gefüges im Vormaterial.Surprisingly, it has been shown that the fact that hot strip in just one pass Final thickness is rolled, particularly good work results let achieve. The immediate, continuous Sequence of casting process and that in one stitch hot rolling allows the heat of the Casting process in the rolling process, so that the always required with conventional slab casting Preheating step before hot rolling avoided can be. The "taking" of the pouring heat also avoids excessive crystal growth and thus supports in addition, the formation of a fine structure in the Starting material.
Wegen des besonderen Einflusses des Erstarrungsvorgangs auf die Eigenschaften des Endprodukts ist es vorteilhaft, wenn die Weiterverarbeitung des Vormaterials zu Warmband eine im unmittelbaren Anschluß an das Gießen erfolgende kontrollierte Abkühlung umfaßt. Dies ermöglicht es, das aus der Gießkokille austretende Vormaterial gezielt so abzukühlen, daß ein für die Weiterverarbeitung optimiertes Gefüge erhalten wird. Dabei wird die Abkühlung in der Regel mit einer gegenüber der Abkühlung an Luft höheren Abkühlgeschwindigkeit erfolgen.Because of the special influence of the solidification process on the properties of the final product it is advantageous if the processing of the primary material into hot strip one that follows immediately after the casting controlled cooling. This enables the Pre-material emerging from the casting mold specifically in this way cool that one for further processing optimized structure is obtained. The Cooling down usually with a cooling down take place in air at a higher cooling rate.
Versuche haben gezeigt, daß, in Abhängigkeit von der Zusammensetzung und den gewünschten Eigenschaften des Endproduktes, die mittlere Walzanfangstemperatur, mit der das Vormaterial in das Walzgerüst einläuft, zwischen 1100°C und 750°C liegen kann.Experiments have shown that, depending on the Composition and the desired properties of the End product, the mean rolling starting temperature with which the raw material runs into the roll stand, between 1100 ° C and 750 ° C can be.
Sofern das Vormaterial warmgewalzt wird, können die Eigenschaften des warmgewalzten Bandes darüber hinaus dadurch gezielt beeinflußt werden, daß das gewalzte Warmband im Anschluß an das Warmwalzen kontrolliert abgekühlt wird. If the primary material is hot rolled, the Properties of the hot rolled strip beyond are specifically influenced by the fact that the rolled Hot strip checked after hot rolling is cooled.
Grundsätzlich ist es denkbar, das erfindungsgemäß erhaltene Warmband "inline" beispielsweise zu einem Kaltband weiterzuverarbeiten. In vielen Fällen wird es im Hinblick auf möglicherweise folgende Verarbeitungsschritte oder einzustellende Eigenschaften des Warmbandes jedoch zweckmäßig sein, wenn das Band im Zuge der Weiterverarbeitung zu einem Coil gehaspelt wird.Basically, it is conceivable that the invention hot strip obtained "inline" for example to a Cold strip to process further. In many cases With regard to possibly following Processing steps or properties to be set the hot strip, however, be useful if the strip in Is reeled into a coil during further processing.
Indem die Weiterverarbeitung des Vormaterials zu Warmband mindestens abschnittsweise unter einer Schutzgasatmosphäre erfolgt, kann eine Oxidation der Bandoberfläche und damit einhergehend eine übermäßige Zunderbildung vermieden werden. In diesem Zusammenhang ist es besonders günstig, wenn das Vormaterial mindestens bis zu seinem Eintritt in das Walzgerüst unter der Schutzgasatmosphäre gehalten wird.By processing the raw material into hot strip at least in sections under one Protective gas atmosphere takes place, oxidation of the Band surface and associated with it an excessive Scale formation can be avoided. In this context it is particularly favorable if the primary material at least until it entered the rolling stand under the Protective gas atmosphere is kept.
Erfindungsgemäß zum Einsatz kommende Stähle können neben weiteren Legierungselementen bis zu 3,5 Gew.-%, insbesondere bis zu 3 Gew.-%, Silizium enthalten. Darüber hinaus können sie bis zu 3,5 Gew.-%, insbesondere bis zu 3 Gew.-%, Aluminium aufweisen. Eisen und Aluminium bzw. Eisen und Silizium bilden in Stählen der erfindungsgemäß verarbeiteten Art intermetallische Phasen, die unterhalb der Warmformungstemperatur auftreten und bis zur Raumtemperatur stabil sind.Steels used according to the invention can be used in addition to further alloying elements up to 3.5% by weight, in particular up to 3% by weight, contain silicon. About that in addition, they can contain up to 3.5% by weight, in particular up to 3% by weight, have aluminum. Iron and aluminum or Iron and silicon form the steels according to the invention processed type intermetallic phases below the hot forming temperature occur and up to Room temperature are stable.
Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. Es zeigen:The invention is based on a Embodiment explained in more detail. Show it:
Figur den Aufbau einer Vorrichtung zum Erzeugen eines
Warmbandes in einer schematischen seitlichen
Ansicht,
Diagramm den Temperaturverlauf über die Verarbeitungszeit
des Vor- und Warmbandes in einer Vorrichtung
gemäß Fig. 1,FIG. 1 shows the structure of a device for producing a hot strip in a schematic side view,
Diagram the temperature curve over the processing time of the pre-strip and hot strip in a device according to FIG. 1,
Bild 1 einen vergrößerten Schnitt durch den Kantenbereich des in der Vorrichtung gemäß Fig. 1 erzeugten Warmbandes, Figure 1 is an enlarged section through the edge region of the hot strip produced in the device according to Fig. 1,
Bild 2 einen vergrößerten Schnitt durch den Mittenbereich des in der Vorrichtung gemäß Fig. 1 erzeugten Warmbandes. Figure 2 shows an enlarged section through the central region of the hot strip produced in the device according to FIG. 1.
Die Figur zeigt schematisch den Aufbau einer Vorrichtung 1 zum Erzeugen eines Warmbandes W, die eine Gießvorrichtung 2, eine erste Kühlstrecke 3, ein Walzgerüst 4, eine zweite Kühlstrecke 5 und eine Haspeleinrichtung 6 umfaßt.The figure shows schematically the structure of a device 1 for producing a hot strip W, which comprises a casting device 2 , a first cooling section 3 , a roll stand 4 , a second cooling section 5 and a reel device 6 .
In der nach dem bekannten Prinzip einer Zwei-Rollen- Gießmaschine ("Double Roller") aufgebauten Gießvorrichtung 2 wird eine in einem Tundish 7 enthaltene Schmelze S einer nachfolgend im einzelnen erläuterten Zusammensetzung in den zwischen zwei Gießrollen 8, 9 gebildeten Gießspalt 10 zu Vorband V gegossen. Das gegossene Vorband V verläßt den Gießspalt 10 in einem kontinuierlichen Fördervorgang mit einer Dicke, die zwischen weniger als 1 mm und 6 mm variierbar ist.In the casting apparatus 2 constructed according to the known principle of a two-roller casting machine (“double roller”), a melt S contained in a tundish 7 of a composition explained below in detail is converted into a preliminary strip V in the casting gap 10 formed between two casting rollers 8 , 9 cast. The cast pre-strip V leaves the casting gap 10 in a continuous conveying process with a thickness that can be varied between less than 1 mm and 6 mm.
Das Vorband V wird auf seinem Weg zu dem Walzgerüst 4 in der unterhalb des Austritts des Gießspalts 10 und eng benachbart zu diesem angeordneten ersten Kühlstrecke 3 mit einem auf seine Oberflächen aufgebrachten Kühlmedium kontrolliert abgekühlt. On its way to the rolling stand 4, the sliver V is cooled in a controlled manner in the first cooling section 3 arranged below the outlet of the casting gap 10 and closely adjacent to it, using a cooling medium applied to its surfaces.
Die zwischen dem Austritt des Gießspalts 10 und dem Walzgerüst 4 von dem Dünnband V zurückgelegte Förderstrecke ist von einer Einhausung 11 umgeben, in der eine Schutzgas-Atmosphäre aufrechterhalten wird. Auf diese Weise wird ein Kontakt der Bandoberfläche mit dem Sauerstoff der Umgebungsluft vermieden.The conveyor section covered by the thin strip V between the exit of the casting gap 10 and the roll stand 4 is surrounded by a housing 11 in which a protective gas atmosphere is maintained. In this way, contact of the strip surface with the oxygen in the ambient air is avoided.
Das Dünnband V läuft in das Walzgerüst 4 mit einer Walzanfangstemperatur AT ein und wird darin in einem Stich auf seine Enddicke gewalzt.The thin strip V runs into the roll stand 4 with a rolling start temperature AT and is rolled in one pass to its final thickness.
Das das Walzgerüst 4 mit einer Walzendtemperatur ET verlassende Warmband W durchläuft unmittelbar anschließend die zweite Kühlstrecke 5. In der Kühlstrecke 5 wird das Warmband W wiederum mit einem geeigneten Kühlmedium kontrolliert auf die Haspeltemperatur HT gebracht, mit der es schließlich in der Haspeleinrichtung 6 zu einem Coil C aufgewickelt wird.The hot strip W leaving the roll stand 4 with a final roll temperature ET immediately passes through the second cooling section 5 . In the cooling section 5 , the hot strip W is in turn brought to the reel temperature HT in a controlled manner with a suitable cooling medium, with which it is finally wound up into a coil C in the reel device 6 .
Im beigefügten Diagramm sind die Walzanfangstemperatur AT, die Walzendtemperatur ET und die Haspeltemperatur HT über die Verarbeitungszeit nach dem Gießen in der Bandbreite dargestellt, die sich in Abhängigkeit von der Zusammensetzung und den gewünschten Eigenschaften des zu erzeugenden Warmbandes auf einer gemäß der Figur aufgebauten Vorrichtung einstellen lassen. Durch eine geeignete Temperaturführung entlang einer vorgegebenen Grenzkurve mit anschließendem isothermen Halten, Walzen und Abschrecken läßt sich das feinkörnige Gefüge des Warmbandes nach dem Austritt aus dem Walzgerüst einfrieren, so daß die guten Gebrauchseigenschaften des Warmbandes nach dem Warmwalzen erhalten bleiben. Insbesondere dann, wenn der Temperaturverlauf des Vor- und Warmbandes der unteren im Diagramm dargestellten Grenzkurve angenähert ist, läßt sich dieser Effekt erreichen.In the attached diagram are the initial roll temperature AT, the end roll temperature ET and the reel temperature HT about the processing time after casting in the Bandwidth shown, which varies depending on the Composition and the desired properties of the generating hot strip on a according to the figure Have the assembled device adjusted. By a suitable temperature control along a given Limit curve with subsequent isothermal hold, rolling and the fine-grained structure of the Hot strip after leaving the rolling stand freeze so that the good performance of the Hot strip is retained after hot rolling. Especially when the temperature profile of the pre and hot strip of the bottom shown in the diagram Limit curve is approximated, this effect can be to reach.
Die im Ausführungsbeispiel vergossene Schmelze S wies neben den üblichen unvermeidbaren Verunreinigungen einen Mn-Gehalt von 20 Gew.-%, einen C-Gehalt von 0,003 Gew.-%, einen Schwefelgehalt von 0,007 Gew.-%, einen Si-Gehalt von 3,0 Gew.-%, einen Al-Gehalt von 3,0 Gew.-% und als Rest Eisen auf.The melt S cast in the exemplary embodiment pointed in addition to the usual unavoidable impurities Mn content of 20% by weight, a C content of 0.003% by weight, a sulfur content of 0.007% by weight, a Si content of 3.0% by weight, an Al content of 3.0% by weight and as Rest of iron on.
Bild 1 zeigt einen vergrößerten Schnitt durch den Kantenbereich und Bild 2 einen in gleicher Weise vergrößerten Schnitt durch den Mittenbereich eines aus diesem Stahl in der in der Figur dargestellten Vorrichtung erzeugten Warmbands. Es zeigt sich, daß das Band ein dendritisch ausgebildetes Gefüge aufweist, welches aus Austenit und einer vermutlich kohlenstoffhaltigen zweiten Phase besteht. Zum Kern des Bandes hin zeigt sich eine deutliche Feinung des Gefüges. Figure 1 shows an enlarged section through the edge area and Figure 2 shows an enlarged section in the same way through the central area of a hot strip produced from this steel in the device shown in the figure. It can be seen that the strip has a dendritic structure which consists of austenite and a presumably carbon-containing second phase. Towards the core of the tape, there is a clear fine-tuning of the structure.
11
Vorrichtung
contraption
22
Zwei-Rollen-Gießmaschine
Two-roll casting machine
33
erste Kühlstrecke
first cooling section
44
Walzgerüst
rolling mill
55
zweite Kühlstrecke
second cooling section
66
Haspeleinrichtung
coiler
77
Tundish
tundish
88th
, .
99
Gießrollen
casting rolls
1010
Gießspalt
casting gap
1111
Einhausung
AT Walzanfangstemperatur
C Coil
ET Walzendtemperatur
S Schmelze
V Dünnband
W Warmband
housing
AT initial roll temperature
C coil
ET final roll temperature
S melt
V thin band
W hot strip
Claims (11)
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10060948A DE10060948C2 (en) | 2000-12-06 | 2000-12-06 | Process for producing a hot strip from a steel with a high manganese content |
| ES01991793T ES2221659T3 (en) | 2000-12-06 | 2001-12-06 | PROCEDURE FOR THE GENERATION OF A HOT LAMINATED BAND OF A STEEL THAT PRESENTS A LIFTED CONTENT OF MANGANESE. |
| CN01816434.XA CN1236076C (en) | 2000-12-06 | 2001-12-06 | Method for producing a hot rolled strip made of a steel comprising a high content of manganese |
| PL362508A PL196538B1 (en) | 2000-12-06 | 2001-12-06 | Method for producing a hot rolled strip made of a steel comprising a high content of manganese |
| EP01991793A EP1341937B1 (en) | 2000-12-06 | 2001-12-06 | Method for producing a hot rolled strip made of a steel comprising a high content of manganese |
| JP2002548196A JP3836793B2 (en) | 2000-12-06 | 2001-12-06 | Process for the production of hot strips from steel with a high manganese content |
| DE50102363T DE50102363D1 (en) | 2000-12-06 | 2001-12-06 | METHOD FOR PRODUCING A WARM STRIP FROM A STEEL HAVING A HIGH MANGANE CONTENT |
| CZ2003-1558A CZ304928B6 (en) | 2000-12-06 | 2001-12-06 | Process for producing steel strips by hot rolling |
| US10/433,729 US20040074628A1 (en) | 2000-12-06 | 2001-12-06 | Method for producing a hot rolled strip made of a steel comprising a high content of manganese |
| PCT/EP2001/014306 WO2002046480A1 (en) | 2000-12-06 | 2001-12-06 | Method for producing a hot rolled strip made of a steel comprising a high content of manganese |
| AU2002231664A AU2002231664A1 (en) | 2000-12-06 | 2001-12-06 | Method for producing a hot rolled strip made of a steel comprising a high content of manganese |
| AT01991793T ATE267269T1 (en) | 2000-12-06 | 2001-12-06 | METHOD FOR PRODUCING A HOT STRIP FROM A HIGH MANGANEOUS STEEL |
| US11/796,245 US20070199631A1 (en) | 2000-12-06 | 2007-04-27 | Method for producing a hot strip from a steel which has a high manganese content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10060948A DE10060948C2 (en) | 2000-12-06 | 2000-12-06 | Process for producing a hot strip from a steel with a high manganese content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE10060948A1 DE10060948A1 (en) | 2002-06-27 |
| DE10060948C2 true DE10060948C2 (en) | 2003-07-31 |
Family
ID=7666209
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE10060948A Expired - Fee Related DE10060948C2 (en) | 2000-12-06 | 2000-12-06 | Process for producing a hot strip from a steel with a high manganese content |
| DE50102363T Expired - Lifetime DE50102363D1 (en) | 2000-12-06 | 2001-12-06 | METHOD FOR PRODUCING A WARM STRIP FROM A STEEL HAVING A HIGH MANGANE CONTENT |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE50102363T Expired - Lifetime DE50102363D1 (en) | 2000-12-06 | 2001-12-06 | METHOD FOR PRODUCING A WARM STRIP FROM A STEEL HAVING A HIGH MANGANE CONTENT |
Country Status (11)
| Country | Link |
|---|---|
| US (2) | US20040074628A1 (en) |
| EP (1) | EP1341937B1 (en) |
| JP (1) | JP3836793B2 (en) |
| CN (1) | CN1236076C (en) |
| AT (1) | ATE267269T1 (en) |
| AU (1) | AU2002231664A1 (en) |
| CZ (1) | CZ304928B6 (en) |
| DE (2) | DE10060948C2 (en) |
| ES (1) | ES2221659T3 (en) |
| PL (1) | PL196538B1 (en) |
| WO (1) | WO2002046480A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059006A1 (en) | 2007-12-06 | 2009-06-10 | Salzgitter Flachstahl Gmbh | Production of hot strip from transition-free ferritic steel comprises casting melt in horizontal strip casting unit to produce semi-finished strip of specified thickness which is then rolled with specified degree of deformation |
| DE102007059007A1 (en) | 2007-12-06 | 2009-06-18 | Salzgitter Flachstahl Gmbh | Producing hot-rolled strip from triplex structural steel for automobile industry, by casting melt in horizontal strip casting plant, free of bends and with killed-flow to form pre-strip and then rolling with deformation grade to give strip |
| US8852356B2 (en) | 2009-03-11 | 2014-10-07 | Salzgitter Glachstahl GmbH | Method for producing a hot rolled strip and hot rolled strip produced from ferritic steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004050220A (en) | 2002-07-18 | 2004-02-19 | Ishikawajima Harima Heavy Ind Co Ltd | Facility for producing strip |
| DE10259230B4 (en) * | 2002-12-17 | 2005-04-14 | Thyssenkrupp Stahl Ag | Method for producing a steel product |
| DE102004054444B3 (en) * | 2004-08-10 | 2006-01-19 | Daimlerchrysler Ag | Method for making steel articles with high rigidity and plasticity comprises mechanical shaping of steel in which twinning induce plasticity or shearband induced plasticity is produced, to give increase in rigidity of at least 30 percent |
| WO2006048034A1 (en) * | 2004-11-03 | 2006-05-11 | Thyssenkrupp Steel Ag | High-strength steel strip or sheet exhibiting twip properties and method for producing said strip by direct strip casting ' |
| FR2878257B1 (en) * | 2004-11-24 | 2007-01-12 | Usinor Sa | PROCESS FOR MANUFACTURING AUSTENITIC STEEL SHEET, FER-CARBON-MANGANIZED WITH VERY HIGH RESISTANCE AND ELONGATION CHARACTERISTICS, AND EXCELLENT HOMOGENEITY |
| DE102005052774A1 (en) * | 2004-12-21 | 2006-06-29 | Salzgitter Flachstahl Gmbh | Method of producing hot strips of lightweight steel |
| DE102005010243A1 (en) * | 2005-03-05 | 2006-09-07 | Sms Demag Ag | Method and plant for producing a lightweight steel with a high manganese content |
| JP4555183B2 (en) * | 2005-07-15 | 2010-09-29 | 株式会社神戸製鋼所 | Manufacturing method of forming aluminum alloy sheet and continuous casting apparatus for forming aluminum alloy |
| DE102008005158A1 (en) | 2008-01-18 | 2009-07-23 | Robert Bosch Gmbh | Automotive fuel injection component for diesel or petrol engine is machined from austenitic steel having transformation induced plasticity |
| DE102009030324A1 (en) * | 2009-06-24 | 2011-01-05 | Voestalpine Stahl Gmbh | Manganese steel and process for producing the same |
| US10001228B2 (en) * | 2011-06-17 | 2018-06-19 | National Oilwell Varco Denmark I/S | Unbonded flexible pipe |
| KR102079847B1 (en) * | 2013-07-10 | 2020-02-20 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | Method for producing a flat product from an iron-based shape memory alloy |
| CN106583454A (en) * | 2016-12-30 | 2017-04-26 | 宁波大学 | Continuous casting-cross wedge rolling moulding method for stud bar-free double-metal layer composite solid shafts |
| CN106734203A (en) * | 2016-12-30 | 2017-05-31 | 宁波大学 | A kind of continuous casting-cross wedge rolling forming method without material head double-metal layer composite hollow axle |
| CN108655354B (en) * | 2018-06-07 | 2019-12-27 | 东北大学 | Short-process preparation method of high-strength-ductility medium manganese steel thin strip |
| CN110899644A (en) * | 2018-09-14 | 2020-03-24 | 宝山钢铁股份有限公司 | Production method of ultrathin hot rolled strip steel |
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| DE19900199A1 (en) * | 1999-01-06 | 2000-07-13 | Ralf Uebachs | High strength light constructional steel for pre-stressed concrete reinforcements or automobile body components has high manganese and aluminum contents |
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| US4331474A (en) * | 1980-09-24 | 1982-05-25 | Armco Inc. | Ferritic stainless steel having toughness and weldability |
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| DE3440752A1 (en) * | 1984-11-08 | 1986-05-22 | Thyssen Stahl AG, 4100 Duisburg | METHOD FOR PRODUCING HOT TAPE WITH A TWO-PHASE TEXTURE |
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| JPH06322440A (en) * | 1993-05-12 | 1994-11-22 | Nippon Steel Corp | Method for rolling high manganese nonmagnetic steel slab |
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-
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- 2000-12-06 DE DE10060948A patent/DE10060948C2/en not_active Expired - Fee Related
-
2001
- 2001-12-06 JP JP2002548196A patent/JP3836793B2/en not_active Expired - Fee Related
- 2001-12-06 AT AT01991793T patent/ATE267269T1/en active
- 2001-12-06 AU AU2002231664A patent/AU2002231664A1/en not_active Abandoned
- 2001-12-06 US US10/433,729 patent/US20040074628A1/en not_active Abandoned
- 2001-12-06 WO PCT/EP2001/014306 patent/WO2002046480A1/en active IP Right Grant
- 2001-12-06 CZ CZ2003-1558A patent/CZ304928B6/en not_active IP Right Cessation
- 2001-12-06 DE DE50102363T patent/DE50102363D1/en not_active Expired - Lifetime
- 2001-12-06 ES ES01991793T patent/ES2221659T3/en not_active Expired - Lifetime
- 2001-12-06 PL PL362508A patent/PL196538B1/en unknown
- 2001-12-06 EP EP01991793A patent/EP1341937B1/en not_active Expired - Lifetime
- 2001-12-06 CN CN01816434.XA patent/CN1236076C/en not_active Expired - Fee Related
-
2007
- 2007-04-27 US US11/796,245 patent/US20070199631A1/en not_active Abandoned
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19900199A1 (en) * | 1999-01-06 | 2000-07-13 | Ralf Uebachs | High strength light constructional steel for pre-stressed concrete reinforcements or automobile body components has high manganese and aluminum contents |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007059006A1 (en) | 2007-12-06 | 2009-06-10 | Salzgitter Flachstahl Gmbh | Production of hot strip from transition-free ferritic steel comprises casting melt in horizontal strip casting unit to produce semi-finished strip of specified thickness which is then rolled with specified degree of deformation |
| DE102007059007A1 (en) | 2007-12-06 | 2009-06-18 | Salzgitter Flachstahl Gmbh | Producing hot-rolled strip from triplex structural steel for automobile industry, by casting melt in horizontal strip casting plant, free of bends and with killed-flow to form pre-strip and then rolling with deformation grade to give strip |
| US8852356B2 (en) | 2009-03-11 | 2014-10-07 | Salzgitter Glachstahl GmbH | Method for producing a hot rolled strip and hot rolled strip produced from ferritic steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3836793B2 (en) | 2006-10-25 |
| CN1466633A (en) | 2004-01-07 |
| JP2004515362A (en) | 2004-05-27 |
| CN1236076C (en) | 2006-01-11 |
| WO2002046480A1 (en) | 2002-06-13 |
| US20040074628A1 (en) | 2004-04-22 |
| EP1341937B1 (en) | 2004-05-19 |
| ES2221659T3 (en) | 2005-01-01 |
| EP1341937A1 (en) | 2003-09-10 |
| DE10060948A1 (en) | 2002-06-27 |
| DE50102363D1 (en) | 2004-06-24 |
| US20070199631A1 (en) | 2007-08-30 |
| CZ20031558A3 (en) | 2004-02-18 |
| ATE267269T1 (en) | 2004-06-15 |
| PL196538B1 (en) | 2008-01-31 |
| CZ304928B6 (en) | 2015-01-28 |
| PL362508A1 (en) | 2004-11-02 |
| AU2002231664A1 (en) | 2002-06-18 |
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Owner name: THYSSENKRUPP STEEL AG, 47166 DUISBURG, DE |
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| 8327 | Change in the person/name/address of the patent owner |
Owner name: THYSSENKRUPP STEEL EUROPE AG, 47166 DUISBURG, DE |
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Effective date: 20130702 |