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EP2176010B1 - Verfahren zum herstellen eines bandes aus stahl - Google Patents

Verfahren zum herstellen eines bandes aus stahl Download PDF

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Publication number
EP2176010B1
EP2176010B1 EP08785258A EP08785258A EP2176010B1 EP 2176010 B1 EP2176010 B1 EP 2176010B1 EP 08785258 A EP08785258 A EP 08785258A EP 08785258 A EP08785258 A EP 08785258A EP 2176010 B1 EP2176010 B1 EP 2176010B1
Authority
EP
European Patent Office
Prior art keywords
strip
roll stand
roll
opened
rolling
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.)
Not-in-force
Application number
EP08785258A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2176010A1 (de
Inventor
Jürgen Seidel
Ernst Windhaus
Markus Reifferscheid
Jürgen Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Siemag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2176010A1 publication Critical patent/EP2176010A1/de
Application granted granted Critical
Publication of EP2176010B1 publication Critical patent/EP2176010B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

Definitions

  • the invention relates to a method for producing a strip of steel, in which a slab is first cast in a casting machine, which slab is subsequently rolled into the strip in at least one rolling train, and wherein the rolling mill has a number of rolling stands.
  • the continuous rolling from the casting heat is known.
  • the process is all the more interesting, the greater the casting speed.
  • the method is known for example from the EP 0 889 762 B1 , of the WO 2006/106376 A1 and from the WO2007 / 073841 A1 ,
  • a slab is first produced in a continuous casting machine, which emerges vertically from a mold downwards and is then deflected into the horizontal.
  • the still hot strip is then fed to a rolling train.
  • the slab is reduced in thickness until the strip of the desired thickness is produced.
  • This technology is also referred to as CSP technology. This is understood to mean the manufacture of a steel strip in a thin slab continuous casting line, which allows efficient production of hot strip, when the rigid connection between the continuous casting plant and the rolling train and their temperature control is governed by the overall system.
  • the rolling stands are arranged directly behind the casting machine. After some (eg two or three) roughing stands, an intermediate heating takes place to a defined intermediate temperature at a reference point or a reference position in front of an n-stand finishing road. Subsequently, a further deformation takes place on the final thickness of the strip in subsequent stands.
  • shears may be arranged to dispose of the cold strand or to chop the strip (under certain operating conditions). To ensure continuous operation, shears behind the rolling stands or in front of a reel group may be required for cutting to a desired coil weight. A pair of scissors directly in front of the reel is used for thin and another pair of scissors for cutting thicker strips. Furthermore, the belt is cooled to a desired winding temperature on a discharge roller table.
  • the present invention is therefore based on the invention, a method of the type mentioned in such a way that a continuous manufacturing process during casting-rolling can be ensured, so that the proportion of low-quality tape with high system availability remains as low as possible.
  • step a) The functional relationship according to step a) is preferably obtained by a computer model. It should be noted that changes in the number of active rolling stands the Endbanddicke.
  • the strip to be rolled is heated before a finishing train, so that it has a defined intermediate temperature. It can also be provided that the strip to be rolled is cooled at least between two rolling mills of the finishing train; In this case, it is particularly conceived that the strip is cooled between the last rolling stands of the finishing train.
  • the temperature of the belt can be measured behind the last active roll stand and the measured value fed to the machine control.
  • the effective end band temperature of the machine control system is present, so that, if necessary, this can be influenced in the closed loop.
  • the method is also suitable for counteracting special events during casting rolling. Thereafter, a rolling stand can be ascended if a predetermined maximum differential rolling force is exceeded there for a predetermined time, each raised rolling stand in the above procedure is taken into account. It is also possible to drive up a rolling stand when a predetermined integral value of a differential rolling force over time is exceeded, wherein the raised rolling stand is taken into account in the above procedure.
  • a rolling stand can also be set up if an unevenness exceeding a predetermined amount is determined on the strip on this roll stand, with each raised roll stand being taken into account in the above procedure.
  • a roll stand can be ramped up if a surface marking is determined on the strip on this roll stand, which exceeds a predetermined amount, whereby any raised roll stand is taken into account in the above procedure.
  • a variation of the proposal according to the invention provides that a roller change can be made during an ongoing production on a driven rolling stand.
  • the invention thus provides that an automatic opening of rolling mills (in particular the finishing mills, behind the point P ref ) takes place, depending on the casting speed or the mass flow to ensure a sufficiently high final rolling temperature, so that the required properties of the Materials are retained and thus the tapes have a sufficiently high quality. It is therefore not worked to a desired Endbanddicke, but given a higher alternative thickness, in which case the high quality of the tape is ensured and in particular no process interruption is to be feared.
  • the resulting strip thickness gives from the number of actively-connected (finishing) rolling mills. The higher minimum end thickness is selected depending on the law of the course of the strip thickness over the number of activated stands, or another thickness above that curve is set according to the need for strip.
  • the level of casting speed determines the temperature profile throughout the plant. If the casting speed is too low, the desired finish rolling temperatures and thus the material properties can not be maintained. Accordingly, the invention proposes a way of how the boundary conditions to the process conditions - in particular the casting speeds - can be adjusted.
  • Another application of the idea according to the invention relates to surface markings on the belt or the work rolls. If surface markings on the belt are no longer acceptable, the scaffolding whose rollers cause the fault or which are damaged can be opened. Ie. in particular, as soon as a new band begins, the corresponding scaffolding is raised, the scaffolds are adjusted in terms of their thickness and selected a corresponding other finished thickness for the band and continue to produce.
  • a roll change during production by the proposed procedure can be made. If a roll change is indispensable, it can be provided to open the roll gap widely and to carry out a roll change, the process according to the invention being carried out. After the roll change, the work rolls become more suitable Tape position and re-incorporated into the acceptance process and adapted to the final roll thickness, the final rolling speed and the temperature control accordingly.
  • the proposed method can also be used if there is a failure of a scaffold. If, for example, the engine of a scaffold fails, then it is possible to proceed as described above; the corresponding framework is then raised, so that the damage to the framework has no serious adverse effects; Rather, it manifests itself only in a change in the strip thickness, but the tape is still made in perfect quality.
  • the proposed method therefore provides significant advantages in casting speed changes to maintain the desired or required finish rolling temperature.
  • the proposed procedure can be used to avoid a casting break.
  • the cooling of the strip within the finishing train at open finishing stands advantageously creates an extended cooling section.
  • Fig. 1 is sketched a casting-rolling plant, with which a band 1 is produced.
  • the plant comprises a casting machine 2, with which a slab 3 is continuously cast.
  • the slab 3 emerges vertically downward from a mold 9 and is deflected in a known manner in the horizontal.
  • a first rolling mill 4 with two rolling stands 6 is arranged. It is followed by a first scissors 10, a heater 11 in the form of an inductive heating or a roller hearth furnace and a second scissors 12 at.
  • Behind the second pair of scissors 12 begins a finishing train 5, which has a number n finishing mills 7. Behind the finishing train 5 is a cooling section 13, wherein before and behind these scissors 14 and 15 are arranged. At the end of the system follow reels 16 in a known manner.
  • the decisive parameter of the process is once the casting speed v at which the cast strand leaves the continuous casting machine 2. Furthermore, the mass flow expressed as the product of the casting speed v with the slab thickness H is a relevant criterion (the width and density of the product are set to a good approximation as constant). At the end of the system, the slab 3 is rolled to the band 1 with the final thickness d E.
  • pyrometers with which the temperature T behind the individual finishing stands 7 can be measured. Between some of the rolling stands 7 separate cooling means 18 are arranged.
  • FIG. 2 shown plant differs from that according to Fig. 1 only by the number of rolling mills 6 of the roughing 4.
  • the rolling train is very compact and the heating section 11 is shorter and designed as induction heating.
  • FIG. 3 Alternatively, a conventional equalizing or heating furnace can be arranged.
  • a reference position P ref is defined, which lies directly in front of the finishing train 5. If there are more than five stands behind the reference position P ref , the same procedure applies. However, additional scaffolds require a higher mass flow.
  • a machine control 8 -as in Fig. 1 The casting speed v or the mass flow vx H and the temperatures T at the outlet of the finish rolling stands 7 of the finishing train 5 are recorded or are provided.
  • the machine controller 8 can influence the setting of the individual rolling stands 6, 7 and, in particular, open the rear rolling stands 7 of the finishing train 5, provided that this is technologically meaningful.
  • the rules to be applied ie the functional characteristics, are stored in the machine control 8 in a mathematical model which is used for the control or regulation of the process.
  • the applicable laws in particular for the relationship between casting speed v or mass flow vx H (as a product of casting speed v with the slab thickness H) and the finishing line outlet temperature T arise as in Fig. 4 to see for different numbers of scaffolds.
  • the representation in Fig. 4 thus, the dependence between the casting speed and the mass flow and the achievable temperature behind the last active scaffolding again, where this is shown for different numbers of active rolling stands.
  • Fig. 4 it is a soft carbon steel with a mean temperature in front of the finishing stands (at the reference position P ref ) of 1200 ° C and an intermediate thickness of 8 to 18 mm at a casting thickness behind the continuous casting plant of 70 mm. The maximum bandwidth of this system is around 1600 mm. From the point of view of optimal processing technology will be for this steel z.
  • a target finish rolling temperature of 850 ° C, which is indicated by the horizontal dashed line.
  • the number of scaffolds used can be read off at the level of the target temperature (horizontal line T target ). Depending on the material, the target finish rolling temperature varies.
  • the finished scaffolds can be subjected to a greater load, so that with a given number n of active rolling stands, a smaller strip thickness d E can be achieved.
  • an intermediate thickness is produced, which before the finishing mill, depending on the number of Vorgerüstaniere used and selected thickness distribution about 8 to 18 mm is.
  • the remainder is taken in the finishing train to the finished strip thickness d E , which is dependent on the number of scaffolds behind the reference position P ref .
  • the producible minimum final thickness varies depending on the dimensioning of the stands and drives or on the process and plant limits.
  • the stored mathematical model is capable of learning; the parameters can be adapted depending on the measured finish rolling temperature and other process parameters. Furthermore, it follows that the course of the curves varies depending on, for example, the amount of cooling water used, amount of descaling water, the distance between the stands, the diameter of the work rolls and the rolling temperatures, or also the material skill.
  • the casting plant 2 supplies the behind arranged rolling train 4, 5 continuously with material.
  • the determination of the process parameters takes place for the casting process as well as for the normal production operation.
  • intermediate scaffold cooling systems 18 are provided between the last scaffolds. These are used to improve the product properties.
  • the desired respective final rolling temperature of the finished strip is monitored behind the last active rolling stand with pyrometers.
  • the optimum or maximum casting speed for various materials is known through tests, so that the correct specification can be selected from the outset. For example, with an achievable casting speed of about 6.5 m / min and a casting thickness of 70 mm, the last jam of the finished road is approached to come close to the Ziei-Ferttg Avenuentemperatur. Ie. it is pre-rolled with the roughing stands to an intermediate thickness of 8 to 18 mm, and then as a rule a finish rolling with only 4 finishing stands.
  • This procedure can be planned in advance. However, with problems in the continuous casting plant and associated casting speed reduction, a change in thickness occurs within a belt. If the casting process has stabilized again and the casting speed exceeds the predetermined minimum value, the setting is made again accordingly Fig. 4 as soon as the rolling of a new volume is started. The tape area with the "wrong" thickness is saved in order to be able to cut out this part of the tape later.
  • Driving on a roll stand is understood here to mean that the work rolls of the stand are removed from one another in such a way that no rolling of the slab or of the strip takes place in this rolling stand.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
EP08785258A 2007-08-04 2008-07-31 Verfahren zum herstellen eines bandes aus stahl Not-in-force EP2176010B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007036967 2007-08-04
DE102007058709A DE102007058709A1 (de) 2007-08-04 2007-12-06 Verfahren zum Herstellen eines Bandes aus Stahl
PCT/EP2008/006316 WO2009018957A1 (de) 2007-08-04 2008-07-31 Verfahren zum herstellen eines bandes aus stahl

Publications (2)

Publication Number Publication Date
EP2176010A1 EP2176010A1 (de) 2010-04-21
EP2176010B1 true EP2176010B1 (de) 2012-09-12

Family

ID=40176025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08785258A Not-in-force EP2176010B1 (de) 2007-08-04 2008-07-31 Verfahren zum herstellen eines bandes aus stahl

Country Status (16)

Country Link
US (1) US8327918B2 (ru)
EP (1) EP2176010B1 (ru)
JP (1) JP2010529907A (ru)
KR (1) KR101152166B1 (ru)
CN (1) CN102083558A (ru)
AR (1) AR067806A1 (ru)
AU (1) AU2008285980B2 (ru)
CA (1) CA2689457C (ru)
DE (1) DE102007058709A1 (ru)
EG (1) EG25305A (ru)
MX (1) MX2009012903A (ru)
RU (1) RU2434696C1 (ru)
TW (1) TWI371319B (ru)
UA (1) UA97167C2 (ru)
WO (1) WO2009018957A1 (ru)
ZA (1) ZA200908074B (ru)

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DE102006054932A1 (de) 2005-12-16 2007-09-13 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Gießwalzen
WO2007072515A1 (en) * 2005-12-22 2007-06-28 Giovanni Arvedi Process and related plant for producing steel strips with solution of continuity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013107010A1 (de) * 2013-07-03 2015-01-22 Thyssenkrupp Steel Europe Ag Anlage und Verfahren zum Warmwalzen von Stahlband

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AU2008285980A1 (en) 2009-02-12
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KR20100009649A (ko) 2010-01-28
UA97167C2 (ru) 2012-01-10
CN102083558A (zh) 2011-06-01
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TW200927316A (en) 2009-07-01
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US8327918B2 (en) 2012-12-11
AR067806A1 (es) 2009-10-21
AU2008285980B2 (en) 2011-03-10
MX2009012903A (es) 2010-01-14
EP2176010A1 (de) 2010-04-21
RU2010107862A (ru) 2011-09-10
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