EP2334830A1 - Verfahren und vorrichtung zur herstellung von warmband-walzgut aus siliziumstahl - Google Patents
Verfahren und vorrichtung zur herstellung von warmband-walzgut aus siliziumstahlInfo
- Publication number
- EP2334830A1 EP2334830A1 EP09740663A EP09740663A EP2334830A1 EP 2334830 A1 EP2334830 A1 EP 2334830A1 EP 09740663 A EP09740663 A EP 09740663A EP 09740663 A EP09740663 A EP 09740663A EP 2334830 A1 EP2334830 A1 EP 2334830A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- strip
- plant
- temperature
- 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.)
- Granted
Links
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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
- C21D8/1222—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving particular fabrication steps or treatments of ingots or slabs
-
- 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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
Definitions
- the present invention relates to a method and an apparatus for producing hot rolled strip of silicon alloyed steels for further processing into grain oriented electrical steel strip.
- the further processing of the hot strip is not the subject of this application; it is done by heat treatments and cold rolling.
- Grain-oriented electrical steel for example, for subsequent processing into laminated electrical sheet for transformers or electrical machines, is characterized by low specific Ummagnethneshnee and high magnetic permeability. As the consumption of electrical energy increases and ever higher demands are made on the efficiencies of electrical machines, there is a high demand for high-quality and low-priced electrical sheets.
- the production of electrical steel strip can be subdivided into the following process steps: steel, hot strip and cold strip production, heat treatment and strip coating (see leaflet 401 "Electrical steel and sheet", Stahl-Informations-Zentrum, Dusseldorf, 2005 edition ⁇ .
- WO 98/46802 A1 discloses a process for the production of grain-oriented electrical steel sheets, wherein either a) a specific steel alloy is melted and a thin strand is cast in a continuous casting plant, then the strand is cut, the slabs are annealed, finish-rolled, cooled and the hot strip wound up; or b) a specific steel alloy is melted and cast from a thin strand in a continuous casting plant, then the strand is finish-rolled, cooled and wound up the hot strip. Following the operations according to a) or b), the hot strip is substantially annealed, rolled in a cold rolling mill to the final thickness, decarburized and subjected to a targeted secondary recrystallization. The molten steel alloy contains so-called.
- Growth inhibitors namely sulfides, carbides or nitrides of the elements Mn, Cu and Al, which prevent the grain growth of the present after finish rolling structure.
- these precipitates also act on the recrystallization during the deformation and immediately thereafter in such a way that a microstructure can be formed which is subsequently suitable for the production of a material having the desired grain properties.
- the prior art process for the production of hot strip rolling stock is either very energy consuming, or results in quality degradation of the further processed grain oriented electrical steel sheets.
- the compensation ovens used for the annealing of the slabs are also not very compact, which in turn increases the investment costs of the entire system.
- the object of the invention is to provide a method and a casting-rolling compound of the type mentioned, with which high-quality hot strip rolling can be produced cost-effectively for further processing into grain-oriented electrical steel with excellent magnetic, electrical and geometric properties.
- a high-quality hot strip rolling stock of this type is understood to mean a hot strip in which the growth inhibitors are finely dispersed and homogeneously distributed in the hot strip.
- This object is achieved by a method in which the following method steps are carried out in the stated sequence on a cast-rolling composite installation: a) melting a steel having a chemical composition in weight% of Si 2 to 7%, C 0.01 to 0.1%, Mn ⁇ 0.3%, Cu 0.1 to 0.7%, Sn ⁇ 0, 2%, S ⁇ 0.05%, Al ⁇ 0.09%, Cr ⁇ 0.3%, N ⁇ 0.02%, P ⁇ 0.1%, balance Fe and impurities; b) casting a strand having a thickness of 25 to 150 mm on a continuous caster; c) rolling to a strip in up to 4 rolling passes immediately after casting the strand, wherein at least one rolling pass a degree of deformation> 30% or thePolumformgrad all stitches>50%; d) heating the tape to a final temperature of 1050 to 1250 0 C, preferably 1100 to 1180 0 C; e) finish rolling the strip in a second rolling mill, then f) cooling and reeling the strip.
- step a the formation of homogeneously distributed and finely dispersed growth inhibitors, namely sulfides, nitrides and carbides of the elements Mn, Cu, Al but also Cr, by the melting of a specific steel alloy (step a) and the casting of a thin strand (step b) immediately following rollers of a belt with high degrees of deformation (step c) conveyed on a first rolling mill.
- the degree of deformation ⁇ is defined as ⁇ ⁇ - -, where ho is the thickness before forming and hi the
- Growth inhibitors is stopped and already formed precipitates are given with given kinetics again. If the temperature is lowered again during finish rolling on a second rolling line (step e) and the subsequent cooling of the strip (step f), further homogeneously distributed and finely dispersed growth inhibitors are formed.
- the manufacturing process can either fully continuous, ie. based on a strand or an undivided band, or in non-continuous batch mode, ie. based on slabs.
- the final temperature is maintained after the heating of the tape for a duration t, for which applies t> 15 s, preferably t> 60 s.
- the final temperature of the strip is advantageously maintained in a continuous furnace, which is designed, for example, as a gas-fired furnace or as an induction furnace.
- a continuous furnace which is designed, for example, as a gas-fired furnace or as an induction furnace.
- the temperature of the belt in fully continuous operation can be maintained in a particularly compact manner.
- the end temperature of the strip is advantageously maintained by winding and unwinding in a coiler oven.
- the temperature of the belt in non-continuous operation can be maintained in a particularly compact manner.
- the strip is finish-rolled in a second rolling train in 2 to 6, preferably in 3 to 5, rolling passes.
- the strip after finish rolling has a final rolling temperature of 900 to 1050 0 C. This will ensure that the strip is finish rolled in a favorable temperature range.
- a further advantageous embodiment is that the band within max. 10 s, preferably within raax. ⁇ s, after the finish rolling to a reel temperature of 300 to 600 0 C by means of an intensive cooling step is cooled.
- a further advantageous embodiment of the method according to the invention consists in that the strip is cooled at the beginning of the intensive cooling step with a doubling, preferably three times, as high a cooling rate as at the end of the cooling step.
- the sum of the alloying elements is Cu + Mn> 0.35% by weight, preferably> 0.55% by weight.
- the sum of the alloying elements S + N is> 100 ppm, preferably> 200 ppm.
- a sufficient amount of Cu, Mn, S and N in the molten steel is advantageous in order to be able to excrete sufficient amount of growth inhibitors into the hot strip.
- the quotient of the alloying elements is Cu / Mn> 2.5, preferably> 3.5. Since Cu sulfides have a smaller size and precipitation temperature than Mn sulfides and are therefore to be preferred, it is advantageous if the molten steel contains more Cu than Mn. However, since Mn is more affine to S than Cu, there must be an oversupply of Cu in order to quantitatively produce more Cu sulfides than Mn sulfides.
- An advantageous implementation of the method according to the invention, which solves the problem underlying the invention, for continuous operation is that the first Rolling of the continuous casting plant is located immediately downstream and between the heating device and the second rolling mill is a continuous furnace for heat input and / or maintenance of the temperature of the hot strip.
- An advantageous embodiment of the cast-rolled composite plant is to carry out the continuous casting plant as a Dunnbrammen- angtranggussstrom. Another embodiment is that the first rolling mill up to four
- a further embodiment consists in that the second rolling train comprises 2 to 6, preferably 3 to 5, rolling stands.
- Fig. 1 is a schematic representation of a casting-rolling composite plant for non-continuous production of hot strip rolling stock for further processing into grain-oriented sheets
- Fig. 2 is a schematic representation of a casting-rolling composite plant for fully continuous production of hot strip rolling stock for further processing into grain-oriented sheets Embodiment 1
- FIG. 1 shows a cast-rolling composite installation 1 for producing hot-rolled strip of silicon-alloyed steels; the system parts for further processing of the hot strip to a grain-oriented electrical steel are not shown.
- the states ie. the temperatures and thicknesses of the strand or strip in the individual process steps are given in Tab. I; the states are referred to as P1 to P15.
- a continuous casting plant 2 for the production of thin slabs is made of a specific steel alloy, in weight% consisting of Si 3.2%, C 0.08%, Mn 0.1%, Cu 0.3%, Sn 0.08%, S 0.01%, Al 0.03%, Cr 0.1%, N 0.012%, P 0.05%, balance Fe and impurities, cast a strand 3 with a thickness of 90 mm.
- the strand 3 is subjected to a first rolling step consisting of 2 rolling passes on a first rolling mill 5.
- the individual degrees of deformation are respectively 53% and 52%, ie. a strip 42 mm thick (state P2) and then a 20 mm thick strip (state P3) are rolled first.
- the temperature of the strip after the first pass is 1171 0 C, after the second stitch 1086 0 C.
- This first rolling step favors the formation of finely dispersed and homogeneously distributed present clusters of growth inhibitors, namely
- the belt 4 is transported by means of a roller conveyor to a heating device 6, designed as an induction furnace, in which the incoming, cooled to 944 0 C (state P4), strip to a final temperature of 1150 0 C (state P5 ) is heated.
- a heating device 6 designed as an induction furnace, in which the incoming, cooled to 944 0 C (state P4), strip to a final temperature of 1150 0 C (state P5 ) is heated.
- the temperature of the belt in a coiler oven 7 (temperature at the entrance of the coiler furnace 1134 0 C, state P6) is maintained for at least 30 s.
- the residence time of a band area the so-called local residence time, varies depending on the band position.
- the belt After a winding and unwinding of the Vorbands in the coiler 7, the belt is freed by a Entzu matterssstrom 12 of scale, causing the temperature of the belt from 1101 0 C to 1070 0 C drops (temperatures before and after descaling, states P7 and P8).
- the strip is then subjected to four rolling passes on a second rolling line 8 (individual degrees of deformation 55, 53, 28 and 16%, ie strip thicknesses of 9.1, 4.3, 3.1 and 2.6 mm, states P9 to P12 ) to a final hot-rolled strip thickness of 2.6 mm.
- the strip of 1043, 1012 and 984 cools to a final rolling temperature of 955 0 C after the last one
- the strip After finish rolling, the strip is cooled on a cooling line 9 within 3 s after the last pass in the second rolling mill 8 from 932 0 C (input cooling path, state P13) to a temperature of 560 0 C at the exit of the cooling section (state P14 ⁇
- the cluster of growth inhibitors present in the strand are finely dispersed, ie with a typical cluster size ⁇ 60 nm
- the strip After cutting off the hot strip by means of a pair of scissors 10, the strip is wound up in a winding device 11 and the coiling temperature is Registered 540 0 C (state PLS). in far taking place, not shown, manufacturing steps, the present hot-rolled strip is annealed, rolled in a cold rolling mill to the final thickness, decarburized, and subjected to selective secondary recrystallisation.
- Embodiment 2 Embodiment 2
- FIG. 2 another casting-rolling compound plant 1 for fully continuous production of hot strip rolling stock of silicon-alloyed steels is shown / the equipment parts for further processing of the hot strip to a grain-oriented electrical steel are again not shown.
- the states P1 to P5 and P7 to P15 of the strand or strip in the individual process steps are shown in Tab.
- a specific steel alloy chemical
- composition see Embodiment 1) melted and cast in a continuous casting 2 a strand 3 (state Pl). Immediately after the solidification, the strand is subjected to a first rolling step consisting of 2 rolling passes on a first rolling line 5 (states P2 and
- the belt 4 is heated in a heating device 6, which is designed as an induction furnace (states P4 and P5).
- a heating device 6 which is designed as an induction furnace (states P4 and P5).
- the essential difference from the embodiment 1 consists in the fact that the temperature of the belt 4 is maintained after heating in a continuous furnace 13, designed as a gas-fired furnace, for at least 15 s; the local residence time in the continuous furnace is constant for all belt areas (tape head, belt foot).
- the further process steps (descaling P7 to P8, finish rolling P9 to P12, cooling P13 to P14 and coiling P15) are shown in the embodiment 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0163408A AT507475B1 (de) | 2008-10-17 | 2008-10-17 | Verfahren und vorrichtung zur herstellung von warmband-walzgut aus siliziumstahl |
| PCT/EP2009/063245 WO2010043578A1 (de) | 2008-10-17 | 2009-10-12 | Verfahren und vorrichtung zur herstellung von warmband-walzgut aus siliziumstahl |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2334830A1 true EP2334830A1 (de) | 2011-06-22 |
| EP2334830B1 EP2334830B1 (de) | 2017-04-19 |
Family
ID=41558192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09740663.1A Active EP2334830B1 (de) | 2008-10-17 | 2009-10-12 | Verfahren zur herstellung von warmband-walzgut aus siliziumstahl |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20120305212A1 (de) |
| EP (1) | EP2334830B1 (de) |
| CN (1) | CN102186999B (de) |
| AT (1) | AT507475B1 (de) |
| RU (1) | RU2509812C2 (de) |
| UA (1) | UA103055C2 (de) |
| WO (1) | WO2010043578A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012206538A1 (de) | 2012-04-20 | 2013-10-24 | Siemens Aktiengesellschaft | Lokalisierung eines Bauteils in einer Industrieanlage mittels eines mobilen Bediengeräts |
| DE102013221710A1 (de) * | 2013-10-25 | 2015-04-30 | Sms Siemag Aktiengesellschaft | Aluminium-Warmbandwalzstraße und Verfahren zum Warmwalzen eines Aluminium-Warmbandes |
| CZ2014325A3 (cs) * | 2014-05-12 | 2015-11-11 | Arcelormittal Ostrava A.S. | Pás z orientované transformátorové oceli a způsob jeho výroby |
| JP6572864B2 (ja) * | 2016-10-18 | 2019-09-11 | Jfeスチール株式会社 | 電磁鋼板製造用の熱延鋼板およびその製造方法 |
| DE102020209299A1 (de) * | 2020-07-23 | 2022-01-27 | Sms Group Gmbh | Verfahren zum Herstellen von Stahlband |
| CN114918250A (zh) * | 2022-05-21 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | 一种减少高碳盘条时效时间的生产方法 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5948935B2 (ja) * | 1981-08-05 | 1984-11-29 | 新日本製鐵株式会社 | 低鉄損一方向性電磁鋼板の製造方法 |
| CA1270728A (en) * | 1985-02-25 | 1990-06-26 | Armco Advanced Materials Corporation | Method of producing cube-on-edge oriented silicon steel from strand cast slabs |
| JPH07115041B2 (ja) * | 1987-03-11 | 1995-12-13 | 日本鋼管株式会社 | 無方向性高Si鋼板の製造方法 |
| US5307864A (en) * | 1988-05-26 | 1994-05-03 | Mannesmann Aktiengesellschaft | Method and system for continuously producing flat steel product by the continuous casting method |
| US5049204A (en) * | 1989-03-30 | 1991-09-17 | Nippon Steel Corporation | Process for producing a grain-oriented electrical steel sheet by means of rapid quench-solidification process |
| DE69023291T2 (de) * | 1989-07-12 | 1996-04-04 | Nippon Steel Corp | Verfahren zum Herstellen kornorientierter Elektrobleche aus Stangguss durch Warmwalzen. |
| JPH03229822A (ja) * | 1990-02-06 | 1991-10-11 | Kawasaki Steel Corp | 一方向性けい素鋼板の製造方法 |
| EP0567612A4 (de) * | 1991-10-22 | 1994-04-05 | Po Hang Iron & Steel | Elektrisch nichtorientierte stahlplatten mit hohen magnetischen eigenschaften und deren herstellung. |
| DE4311151C1 (de) * | 1993-04-05 | 1994-07-28 | Thyssen Stahl Ag | Verfahren zur Herstellung von kornorientierten Elektroblechen mit verbesserten Ummagnetisierungsverlusten |
| DE19524082B4 (de) * | 1995-07-01 | 2004-02-26 | Sms Demag Ag | Anlage zur Herstellung von warmgewalztem Stahlband |
| DE19712212A1 (de) * | 1997-03-24 | 1998-10-01 | Schloemann Siemag Ag | Verfahren und Anlage zum Auswalzen von Warmbreitband aus stranggegossenen Brammen |
| AU2698897A (en) * | 1997-04-16 | 1998-11-11 | Acciai Speciali Terni S.P.A. | New process for the production of grain oriented electrical steel from thin slabs |
| TWI288676B (en) * | 2002-07-06 | 2007-10-21 | Sms Demag Ag | Method and casting roller plant for the semi-endless or endless rolling by casting of a metal in particular a steel strip which may be transversely cut as required after solidification |
| ITMI20021996A1 (it) * | 2002-09-19 | 2004-03-20 | Giovanni Arvedi | Procedimento e linea di produzione per la fabbricazione di nastro a caldo ultrasottile sulla base della tecnologia della bramma sottile |
| EP1752549B1 (de) * | 2005-08-03 | 2016-01-20 | ThyssenKrupp Steel Europe AG | Verfahren zur Herstellung von kornorientiertem Elektroband |
| CN1743128A (zh) * | 2005-09-29 | 2006-03-08 | 东北大学 | 连铸板坯直接轧制生产取向硅钢带的方法 |
| DE102008029581A1 (de) * | 2007-07-21 | 2009-01-22 | Sms Demag Ag | Verfahren und Vorrichtung zum Herstellen von Bändern aus Silizum-Stahl oder Mehrphasenstahl |
-
2008
- 2008-10-17 AT AT0163408A patent/AT507475B1/de not_active IP Right Cessation
-
2009
- 2009-10-12 EP EP09740663.1A patent/EP2334830B1/de active Active
- 2009-10-12 WO PCT/EP2009/063245 patent/WO2010043578A1/de not_active Ceased
- 2009-10-12 CN CN200980141033.5A patent/CN102186999B/zh active Active
- 2009-10-12 US US13/124,713 patent/US20120305212A1/en not_active Abandoned
- 2009-10-12 UA UAA201104684A patent/UA103055C2/ru unknown
- 2009-10-12 RU RU2011119637/02A patent/RU2509812C2/ru active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010043578A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102186999A (zh) | 2011-09-14 |
| EP2334830B1 (de) | 2017-04-19 |
| AT507475A1 (de) | 2010-05-15 |
| CN102186999B (zh) | 2015-08-12 |
| US20120305212A1 (en) | 2012-12-06 |
| UA103055C2 (ru) | 2013-09-10 |
| RU2011119637A (ru) | 2012-11-27 |
| RU2509812C2 (ru) | 2014-03-20 |
| WO2010043578A1 (de) | 2010-04-22 |
| AT507475B1 (de) | 2010-08-15 |
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