EP4417341A1 - Procédé de fabrication de produits longs métalliques ainsi qu'installation de laminage de coulée continue pour la mise en oeuvre du procédé - Google Patents

Procédé de fabrication de produits longs métalliques ainsi qu'installation de laminage de coulée continue pour la mise en oeuvre du procédé Download PDF

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Publication number
EP4417341A1
EP4417341A1 EP23156467.5A EP23156467A EP4417341A1 EP 4417341 A1 EP4417341 A1 EP 4417341A1 EP 23156467 A EP23156467 A EP 23156467A EP 4417341 A1 EP4417341 A1 EP 4417341A1
Authority
EP
European Patent Office
Prior art keywords
strand
rolling
casting
cross
section
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.)
Pending
Application number
EP23156467.5A
Other languages
German (de)
English (en)
Inventor
Stephan Feldhaus
Marco ABRAM
Gian HAUENSTEIN
Steve MÜNCH
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 Concast AG
Original Assignee
SMS Concast 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 Concast AG filed Critical SMS Concast AG
Priority to EP23156467.5A priority Critical patent/EP4417341A1/fr
Publication of EP4417341A1 publication Critical patent/EP4417341A1/fr
Pending legal-status Critical Current

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    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/142—Plants for continuous casting for curved 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell

Definitions

  • the invention relates to a method for producing long metallic products, as well as a casting and rolling plant for carrying out the method, according to the preamble of claim 1 and claim 7 respectively.
  • the invention is based on the object of creating a method for producing metallurgical long products or a casting and rolling plant, by means of which the above disadvantages are eliminated and the construction of the casting and rolling plant is associated with lower investment costs, but the performance or productivity of the plant can be maintained.
  • the cast strand is preferably reduced in cross-section after the arcuate removal and before the rolling mill in the sump area near the sump tip.
  • the method according to the invention therefore essentially consists of an overlap of the conventional casting and rolling processes, which results in a shortening of the metallurgical length of the cast strand and thus a shorter design of the plant with correspondingly lower investment costs for the buildings including cranes, crane tracks and similar equipment. Very high casting speeds can be achieved, which improves the overall productivity of the casting and rolling plant.
  • the quality of the products produced according to the invention can be improved, which offers the possibility of applying the process also to steels with higher C contents or higher quality requirements.
  • the invention also provides for the at least one device for reducing the strand cross-section to be placed in the area of the final solidification of the cast strand with a residual melt core, preferably of 5 to 0 percent of the total cross-section of the cast strand.
  • the invention further provides that the rolling mill following the continuous casting machine is placed at a short distance from the at least one device for reducing the strand cross-section.
  • This measure also contributes to shortening the metallurgical length of the cast strand and minimizing the overall length of the plant.
  • the rolling mill can be placed at a distance from the casting plant that corresponds to the original (natural) metallurgical length with sufficient space for necessary cutting and discharge systems or even at a distance that is due to the shortening of the metallurgical length as a result of the reduction of the cross-sectional area shortened compared to the natural metallurgical length.
  • a greater reduction in the strand cross-section and thus a greater shortening of the metallurgical length can be achieved if the cast strand is guided through two or a large number of, for example up to twelve, devices arranged one behind the other to reduce the strand cross-section.
  • the devices or their rollers are advantageously arranged close to one another so that they are located within the sump area.
  • these devices are designed as modular units with a housing structure and a pair of rolling rollers mounted therein, which can be driven by a gear motor mounted next to the housing structure or by a gear motor connected via a cardan shaft and can be pressed against each other by an adjusting element arranged vertically in the housing structure.
  • the devices can be used in particular when products with a round, four-round, polygonal or octagonal cross-section are cast. These formats help to reduce roller wear compared to a rectangular cross-section and also require less effort, as well as better deformation of the strand core of the cast strand.
  • the at least one device can, instead of or in addition to the rollers rotating about a horizontal axis, also have rollers with vertical Rotary axes should be in rolling contact with the cast strand in order to generate a compressive force across the strand. This can result in a higher percentage reduction in the strand cross-section.
  • the method according to the invention can also be used without any problem in continuous casting machines in which the casting takes place with the aid of a rigid cold strand which, for example, is introduced into the mold through the curved strand guide before the casting and is then removed from the mold again after the casting.
  • the invention provides that the cold strand is moved towards and away from the mold by means of a swivel device provided in a frame directly above or in front of the at least one device for reducing the strand cross-section.
  • the casting and rolling plant 1 shown is used to produce metallurgical long products 2, in particular made of steel.
  • the casting and rolling plant 1 comprises a continuous casting machine 3 and a subsequent indicated rolling plant 4 with a number of rolling stands arranged horizontally one behind the other with pairs of rollers, by means of which the cast strand 9 is rolled into a long product, such as a bar, profile, wire and/or the like.
  • the first rolling stand of the rolling plant 4 is shown.
  • the cast strand 9 is formed by the continuous casting machine 3 into a rectangular, square, polygonal, round, four-round, polygonal, octagonal or similar cross-sectional profile depending on the cross-section of its mold 13.
  • the continuous casting machine 1 is constructed in a conventional manner such that it essentially comprises a metallurgical vessel 10 with a spout and an adjoining control element 11, preferably a slide valve or a plug, as well as a Pouring jet protection 12, such as a fireproof pouring pipe.
  • a water-cooled mold 13 is arranged below the control element 11 and the pouring jet protection 12, which forms a cavity whose cross-section corresponds to that of the format to be cast.
  • This format of the strand can be square, rectangular, polygonal, round or similar.
  • a cutting device 35 for emergency cutting of the strands is arranged between the device 21 and the rolling mill 4, for example if an unforeseen process interruption should occur in the latter and the respective advancing strand 9 would have to be cut and conveyed to the side.
  • a discharge device (not shown in detail) can also be arranged downstream of the cutting device 35, e.g. by transversely dragging the cut cast strand section.
  • This cutting device 35 could also be arranged in such a way that it could be placed ready for use in place of the devices 20, 21, the devices then being displaced along the strand so that no additional space would be required between the device 21 and the rolling mill 4 and the mill could therefore be shortened even further overall.
  • a first cutting device 35 can also be arranged in front of the devices 20, 21 in the casting direction, so that no further space would be required between the device 21 and the rolling mill 4. In this case, the strand would have to be cut at a reduced casting speed.
  • two cutting devices 35 could also be provided, one before and one after the devices 20, 21.
  • the cast strand 9 emerging from the mold 13 has in its interior a progressively decreasing liquid and mixing region with a sump region 18 which ends in a sump tip 19, the residual melt core of which can generally amount to approximately 5 to 0 percent by volume of the corresponding strand section.
  • two devices 20, 21 for reducing the strand cross-section are arranged close together in the horizontal direction in this area between the continuous casting machine 1 and the rolling mill 4.
  • the devices 20, 21 are each designed as a modular construction unit, which essentially consists of a multi-part housing structure 22 and two rolling rollers 23, 24 rotatably mounted therein, at least one of which can be driven by a gear motor 25 mounted next to the housing structure 22 and can be pressed against one another by an adjusting element 26 arranged vertically in the housing structure 22 with a pressure force running perpendicular to the longitudinal extension of the strand 9. In this way, they can gradually reduce the strand cross-section of the strand 9 surrounded by them during casting.
  • both rolling rolls of a device can be driven by one motor each and more than one pair of rolls can also be arranged in a device.
  • the rolls can be driven by external motors via connections, such as cardan shafts.
  • the number of devices per strand can be increased from billet and bloom plants to the number required for metallurgical purposes in order to ensure a reduction in the cross-section of the cast strand without cracking.
  • the gear motor 25 is driven by a rotary drive 32 and is connected to the upper roller 23 for rotation, which is not shown in detail.
  • the roller 23 is rotated at a speed adapted to the casting speed.
  • the adjusting element 26 can be a piston/cylinder unit that is pneumatically, hydraulically or electromechanically adjustable in height and, for example, with its piston rod is coupled to the upper roller 23 and can exert the contact pressure on the strand 9.
  • each of these devices 20, 21 is assigned a base 33 on which they are positioned in an alignable manner.
  • the distance between the roller pairs 23, 24 is preferably selected such that the rear roller pair of the device 21 engages at the height of the determined sump tip 19 before the solidification 9' of the strand 9 and the other roller pair of the device 20 engages at the height of the sump area 18, with the devices 20, 21 advantageously being placed directly next to one another. Due to their modular design, their positions can of course be changed along the cast strand as required in order to achieve an optimal reduction of the cast strand without any cracks or other weakening changes occurring in its internal structure.
  • pairs of rollers would be in rolling contact with the cast strand at the side and generate a compressive force across the strand in a horizontal direction in order to bring about this reduction in the strand cross-section according to the invention.
  • the device can have rollers with vertical axes of rotation that are in rolling contact with the cast strand at the side and generate a compressive force across the strand.
  • the rolling rollers 23, 24 are designed in such a way that the gap 27 formed between them can have either a square, rectangular, polygonal or round or oval cross-section, depending on the format of the cast strand 9. The latter is particularly advantageous if the cast strand coming from the continuous casting machine is itself also produced with a round or polygonal cross-section.
  • these rolling rollers 23, 24 are shaped in such a way that they rest flat on the outer surface of the strand 9 due to the pressing force and thus at least partially cause a uniform deformation across the width of the strand.
  • a so-called upright format of the strand cross-section could be reduced by the devices to a square or a polygenic or elliptical format of the strand cross-section could be reduced to an approximately circular format.
  • the plant 1 is equipped with two such devices 20, 21. However, it can also work with just one or more than two such devices as required. They cause a significant reduction in the metallurgical length of the cast strand from the meniscus in the mold 13 to the sump tip 19, which in turn results in significant savings in construction and equipment costs.
  • the rolling mill 4 is placed as close as possible behind the devices 20, 21 located before the solidification 9' of the cast strand. A space is provided between the rear side 21' of the second device 21 and the Rolling mill 4, at its entrance side 4', a distance L preferably of 1 to 25 meters is provided.
  • simulations of the solidification behavior of the strands can also be used, by means of which the sump sections or sump tips and solidifications 9' and thus the determination of the positions of the devices 20, 21 can be determined.
  • These computer-aided Simulation programs can be used to precisely specify or calculate the roller positions of the devices 20, 21 online or offline using a control loop or corresponding controls.
  • the setting of the rollers 23, 24 of the at least one device 20, 21 and the cross-sectional reduction by the at least one device 20, 21 are controlled dynamically depending on the process parameters, or dynamically depending on the process parameters and based on a numerical solidification simulation and depending on the rolling parameters.
  • the number of rolling stands required depends on the product to be produced and the reduced strand cross-section in front of the inlet side 4' of the rolling mill 4, which is therefore sometimes dependent on this reduction by the at least one device 20.
  • a reduction in the metallurgical length from 52 m to 37 m was achieved for a strand product with a cross-sectional format of 165x165 mm 2 by reducing the strand cross-section at 2% of the still liquid, partially liquid and/or pasty cross-sectional area.
  • the overall reduction in the length of the casting and rolling plant 1 depends greatly on the casting speed and the cross-sectional size of the format to be produced.
  • the method according to the invention is therefore particularly advantageous in the production of smaller, but also larger formats and in particular at higher casting speeds.
  • a rigid cold strand 28 is arranged on a frame 30 by a pivoting device 29 with a holder 31.
  • the frame 30 is placed behind the curved guide of the strand above the devices 20, 21.
  • the cold strand 28 can be operated with this pivoting device 29, which is held on the frame 30 directly above the devices 20, 21.
  • the holder 31 of the cold strand is shown in the standby position retracted to the rear and pivoted upwards. By folding down this holder 31 at the front, the cold strand 28 can be brought into the operating position at the front by the pivoting device 29 before casting and pushed up through the curved strand guide and introduced into the mold 13.
  • this cold strand 28 is pulled out of the mold and the curved guide at the initial casting speed and, after being separated from the strand, is reinserted into the Fig.1 shown standby position. With this placement of the stand 30 and the cold strand 28 above the devices 20, 21, there is no need to increase the length of the casting strand 9 up to the inlet side 4' of the rolling mill.
  • cold strands can also be used, such as chain cold strands, which are inserted into the mold from above before pouring. Instead of The cold strand is then also conveyed downwards during casting by the pivoting device 29 and removed by a pickup similar to this device 29.
  • the rolling rollers of the rolling mill are advantageously designed in such a way that they can cause either a rectangular or a round or oval deformation of the cast strand cross-section.
  • the invention is sufficiently illustrated by the above embodiment. However, it could also be illustrated by other variants. These devices could also be constructed differently than with geared motors and with a different adjusting device.
  • the equipment in order to standardize the system, can also be designed as roll stands or rolling mills with pairs of rolls as in the rolling mill.
  • the rolling stands arranged one behind the other with the respective pairs of rollers could be arranged directly behind this at least one device 20. There would then be no cutting device, discharge device or the like arranged between this device and the first rolling stand. This would allow a further reduction in the length of the entire system and thus in the investment costs thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP23156467.5A 2023-02-14 2023-02-14 Procédé de fabrication de produits longs métalliques ainsi qu'installation de laminage de coulée continue pour la mise en oeuvre du procédé Pending EP4417341A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23156467.5A EP4417341A1 (fr) 2023-02-14 2023-02-14 Procédé de fabrication de produits longs métalliques ainsi qu'installation de laminage de coulée continue pour la mise en oeuvre du procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23156467.5A EP4417341A1 (fr) 2023-02-14 2023-02-14 Procédé de fabrication de produits longs métalliques ainsi qu'installation de laminage de coulée continue pour la mise en oeuvre du procédé

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EP4417341A1 true EP4417341A1 (fr) 2024-08-21

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EP23156467.5A Pending EP4417341A1 (fr) 2023-02-14 2023-02-14 Procédé de fabrication de produits longs métalliques ainsi qu'installation de laminage de coulée continue pour la mise en oeuvre du procédé

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625388A1 (fr) * 1993-05-17 1994-11-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et dispositif pour le prélaminage de brames minces sortant d'une installation de coulée continue
WO2000037200A1 (fr) * 1998-12-22 2000-06-29 Sms Demag Ag Procede de production de billettes rondes
JP3289132B2 (ja) * 1996-12-25 2002-06-04 新日本製鐵株式会社 条鋼用鋼片の製造方法
US20090056906A1 (en) * 2005-07-19 2009-03-05 Giovanni Arvedi Process and Related Plant for Manufacturing Steel Long Products Without Interruption
CN109500371A (zh) * 2018-12-20 2019-03-22 南京钢铁股份有限公司 一种板坯动态二冷和轻压下控制系统
EP3623074A1 (fr) 2018-09-13 2020-03-18 SMS Concast AG Procédé de fabrication au voisinage des dimensions définitives de produits oblongs ainsi qu'installation de laminage de coulée continue destinée à la mise en uvre dudit procédé

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625388A1 (fr) * 1993-05-17 1994-11-23 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé et dispositif pour le prélaminage de brames minces sortant d'une installation de coulée continue
JP3289132B2 (ja) * 1996-12-25 2002-06-04 新日本製鐵株式会社 条鋼用鋼片の製造方法
WO2000037200A1 (fr) * 1998-12-22 2000-06-29 Sms Demag Ag Procede de production de billettes rondes
US20090056906A1 (en) * 2005-07-19 2009-03-05 Giovanni Arvedi Process and Related Plant for Manufacturing Steel Long Products Without Interruption
EP3623074A1 (fr) 2018-09-13 2020-03-18 SMS Concast AG Procédé de fabrication au voisinage des dimensions définitives de produits oblongs ainsi qu'installation de laminage de coulée continue destinée à la mise en uvre dudit procédé
CN109500371A (zh) * 2018-12-20 2019-03-22 南京钢铁股份有限公司 一种板坯动态二冷和轻压下控制系统

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