EP0920938A1 - Procédé et installation de coulée continue de production de brames mincesince - Google Patents

Procédé et installation de coulée continue de production de brames mincesince Download PDF

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Publication number
EP0920938A1
EP0920938A1 EP97121430A EP97121430A EP0920938A1 EP 0920938 A1 EP0920938 A1 EP 0920938A1 EP 97121430 A EP97121430 A EP 97121430A EP 97121430 A EP97121430 A EP 97121430A EP 0920938 A1 EP0920938 A1 EP 0920938A1
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EP
European Patent Office
Prior art keywords
strand
segment
mold
casting
maximum
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
Application number
EP97121430A
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German (de)
English (en)
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EP0920938B1 (fr
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 Schloemann Siemag AG
Schloemann 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 Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Priority to AT97121430T priority Critical patent/ATE233143T1/de
Priority to ES97121430T priority patent/ES2193319T3/es
Priority to DE59709405T priority patent/DE59709405D1/de
Priority to EP97121430A priority patent/EP0920938B1/fr
Publication of EP0920938A1 publication Critical patent/EP0920938A1/fr
Application granted granted Critical
Publication of EP0920938B1 publication Critical patent/EP0920938B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a method and an apparatus for Production of slabs on a preferably vertical mold having continuous casting plant preferably for thin slab plants for casting preferably steel with a solidification thickness, for example from 60 to 120 mm e.g. 80 mm and casting speeds up to 10 m / min and a maximum casting performance of approx. 3 million / t / a.
  • the well-known thin slab plants with a strand thickness reduction realized with a casting and rolling device, reduce the strand thickness immediately below the continuous casting mold, with one or two Castor pairs is equipped, mainly in the so-called "segment 0 ".
  • the thickness of the strand is increased e.g. from 65 mm to 40 mm a metallurgical length of approx. 2 m, i.e. over the entire length of the segment (or scaffolding) 0, which is not arranged vertically, reduced at a maximum casting speed of 6 m / min.
  • This Plant data lead to a strand thickness reduction of up to 38% and a maximum deformation speed in the strand thickness 1.25 mm / s.
  • This inner deformation takes off with increasing casting speed and system height or also ferrostatic Pressure increases and increases with decreasing roll spacing from.
  • a possible mechanical engineering Solution could be a sliding plate, also known as a "grid", represent, however, for the implementation of a reduction of Strand thickness is unsuitable.
  • the deformations are to be expected due to the reduction in strand thickness or the so-called casting rolling in segment 0 be generated.
  • This specific internal deformation overlaps the Deformation already generated in segment 0, essentially caused through the strand bulge and the bending process from the Vertical in the inner arc.
  • This accumulation of the individual specific deformations can lead to an overall deformation lead, which becomes critical and to the tearing of the inner as well outer strand shell leads.
  • a 1 m long vertical mold is included one or two pairs of casters to a 2 m long segment 0, in which the strand both over several steps in the inner circular arc bent as well as reduced in thickness.
  • These two simultaneous processes or deformations lead to a overlapping cumulative total deformation consisting of the Bending deformation (D-B) and the casting roll deformation (D-Gw).
  • the Total deformation (D-Ge) that acts on the strand shell can become larger than the critical limit deformation (D-Kr) and too Cracking the inner as well as the outer strand shell.
  • D-Kr critical limit deformation
  • This Danger increases with increasing casting speed due to a roller spacing or roller diameter in segment 0, the mechanical limits can not be arbitrarily small.
  • the training and expansion of the overheated takes place Melt or the pure melting phase in the strand, displayed through the straight line (G1) depending on the casting speed, a significant influence on the inner strand quality.
  • the pure melting phase is sufficient the geometrically lowest liquidus temperature in the middle of the strand at a casting speed VG of 5 m / min to approx. 1.5 m and at VG10 m / min up to approx. 3.0 m below the pouring level.
  • the 2-phase area lies over the entire strand thickness before, consisting of melt and crystal, which with increasing distance towards the top of the sump or the final solidification Loss of melting in favor of crystal loses.
  • FIG. 3 partial image 3a (see the left half of FIG. 3) the training of the different phases is also exemplary of a 100 mm thick strand from the mold level in the mold subsequent strand thickness reduction in the 2 m long segment 0 from 100 mm to 80 mm solidification thickness up to final solidification in last segment No. 14 for the maximum casting speed of 10 m / min.
  • the drawing 3a makes it very clear that the Segment 0 both caused the highest possible deformation through the reduction in strand thickness and the bending process from the vertical in the inner arc over five bending points, in the Strand brings bad conditions for the upgrade as well of oxides in the mold level and thus in the pouring slag.
  • drawing 3a makes it clear that at a casting speed of 5 m / min the reduction speed on the shell of the strand acting from 100 mm to 80 mm thickness, i.e. by 20% is reduced, 0.833 mm / s and at a casting speed of 10 m / min is 1.66 mm / s.
  • This rate of reduction of Strand thickness is a direct measure of the deformation of the strand shell represents that at the entry into segment 0 at a casting speed of 5 m / min approx. 10.3 mm and at a casting speed of 10 m / min is about 7.3 mm thick.
  • This strand deformation caused by the casting rolling is high and is also by the Speed increase from 5 to 10 m / min not only from 0.83 to 1.66 mm / s doubled, as is the simplified calculation size 1.66 mm / s expresses, but the increase in speed goes with a quadratic function in the deformation.
  • the invention is based, for high-speed slab plants the task on the basis of devices for strand thickness reduction a process and a immediately below the mold
  • FIGS. 2 and 3b (see the right half of Figure 3) is the invention with regard to the method and the Characterized device.
  • FIG. 2 shows the distribution of the inner strand deformation according to the invention over the strand guide length with the identification of the System configuration for the casting speeds 5 and 10 m / min as well as the expansion of the pure melting phase, the final solidification in Dependence on the casting speed and the limit deformation represents.
  • the continuous casting process is constructed according to the invention so that the Strand deformation density via the strand guide is minimized and each type of deformation independently of the other one after the other arranged takes place.
  • the deformation curves (D-5) and (D-10) run below the critical and thus limit deformation (D-Kr). Furthermore, the deformation curves make it clear that a Cumulation of deformations caused by casting rolling and the bend is avoided in that in the embodiment the strand thickness reduction (D-Gw) in a 3 m long, vertical Segment 0 and the bend (D-B) of the strand in the subsequent Segment 1 over e.g. five bending points is made.
  • the lowest liquidus point (1.1) or the overheating zone or the penetration zone in the Inside the strand which is about 10% of the solidification time at one Overheating of 25 ° C of the steel in the manifold maximum casting speed of 10 m / min to 3 m below the Casting level extends or extends up to 2 m deep into segment 0.
  • the 2-phase area is from the straight line (G1), which is the lowest position of the liquidus point and the straight line (G2) which determine the position of the Represents sump tip as a function of the casting speed, spanned.
  • the 2-phase area crystal / melt begins in the case from VG 5 m / min at approx. 1.5 m (liquidus point 1.2) below the pouring level or 0.5 m after the strand enters segment 0 and ends at about 15.1 m (point 2.2 (in Fig. 2)) with the swamp tip; in the case of a casting speed of 10 m / min, the 2-phase area begins at about 3 m (1.1) and ends with the swamp tip at approx. 30.2 m (2.1) (see Fig. 2).
  • the bending back of the strand from the inner radius - e.g. 4 m above several bending points, for example five reference points - into the 3 is exemplarily in the 2 m long segment 4 to ensure a gentle re-deformation (D-R) and at the same time the final solidification and thus the strand quality not negatively influenced by strand deformation.
  • D-R gentle re-deformation
  • the strand guide can also be concave with a deviation from the Linearity of maximum 2 x 12 mm to be formed around the strand straight and safe even at high casting speeds To lead strand.
  • This can e.g. with a concave design Profile of the strand guide rollers can be realized.
  • the segment 0 should be arranged vertically and exclusively be used for the strand thickness reduction. It should be one Have a minimum length of one at maximum casting speed Speed in the reduction of the casting thickness of less than 1.25 mm / s generated in the strand and at the same time at the maximum possible Pouring speed has a minimum length that the complete Reduction of overheating and, if possible, a smashing the crystal phase in the 2-phase area crystal / melt and suppression which ensures macro and mid-increase. In this Example described segment 0 has a length of 3 m.
  • segment 1 i.e. immediately after the casting process in Segment 0, according to the invention, the bending of the strand with a 2-phase mixture between the strand shells over, for example, five Bending points in the inner arcs of e.g. 4 m in segment 1 made to keep the strand shell deformation density low and do not cumulate with the previous roll forming deformation allow.
  • the entire continuous caster has a metallurgical length of approx. 30 m, of which approx. 4 m are arranged vertically (K and 0), approx. 8 m in a circular arc (segment 1,2,3,4) and approx. 18 m horizontally (Segments 5 to 13).
  • the lowest liquidus point ((1.1)) protrudes about 2 m into the 3 m long segment 0 into it, with an optimal ascent of oxides into the pouring slag and at the same time a symmetrical distribution of the oxides remaining in the steel but also a smashing of the Crystals in the 2-phase region and suppression of nuclear segregation is guaranteed in the strand.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
  • Forging (AREA)
EP97121430A 1997-12-05 1997-12-05 Procédé et installation de coulée continue de production de brames mincesince Expired - Lifetime EP0920938B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT97121430T ATE233143T1 (de) 1997-12-05 1997-12-05 Verfahren und vorrichtung zur erzeugung von dünnen brammen auf einer stranggiessanlage
ES97121430T ES2193319T3 (es) 1997-12-05 1997-12-05 Procedimiento y dispositivo para la generacion de desbastes finos en una instalacion de fundicion de colada continua.
DE59709405T DE59709405D1 (de) 1997-12-05 1997-12-05 Verfahren und Vorrichtung zur Erzeugung von dünnen Brammen auf einer Stranggiessanlage
EP97121430A EP0920938B1 (fr) 1997-12-05 1997-12-05 Procédé et installation de coulée continue de production de brames mincesince

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97121430A EP0920938B1 (fr) 1997-12-05 1997-12-05 Procédé et installation de coulée continue de production de brames mincesince

Publications (2)

Publication Number Publication Date
EP0920938A1 true EP0920938A1 (fr) 1999-06-09
EP0920938B1 EP0920938B1 (fr) 2003-02-26

Family

ID=8227754

Family Applications (1)

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EP97121430A Expired - Lifetime EP0920938B1 (fr) 1997-12-05 1997-12-05 Procédé et installation de coulée continue de production de brames mincesince

Country Status (4)

Country Link
EP (1) EP0920938B1 (fr)
AT (1) ATE233143T1 (fr)
DE (1) DE59709405D1 (fr)
ES (1) ES2193319T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105945248A (zh) * 2016-06-21 2016-09-21 燕山大学 一种直弧型连铸机的蠕变弯曲蠕变矫直方法
CN109093084A (zh) * 2018-09-29 2018-12-28 东北大学 一种连铸薄板坯的生产方法
CN116020987A (zh) * 2023-01-30 2023-04-28 东北特殊钢集团股份有限公司 高合工钢Cr12MoV系列的连铸方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0611610A1 (fr) * 1993-02-16 1994-08-24 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la production d'un feuillard, d'un feuillard ébauché ou d'une brame
EP0611619A2 (fr) * 1993-02-16 1994-08-24 DANIELI & C. OFFICINE MECCANICHE S.p.A. Moule pour la coulée continue de brames minces
EP0614714A1 (fr) * 1993-03-10 1994-09-14 Sms Schloemann-Siemag Aktiengesellschaft Machine pour la coulée continue de brames minces en acier
DE4403050C1 (de) * 1994-01-28 1995-09-28 Mannesmann Ag Stranggießkokille zum Führen von Strängen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0611610A1 (fr) * 1993-02-16 1994-08-24 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la production d'un feuillard, d'un feuillard ébauché ou d'une brame
EP0611619A2 (fr) * 1993-02-16 1994-08-24 DANIELI & C. OFFICINE MECCANICHE S.p.A. Moule pour la coulée continue de brames minces
EP0614714A1 (fr) * 1993-03-10 1994-09-14 Sms Schloemann-Siemag Aktiengesellschaft Machine pour la coulée continue de brames minces en acier
DE4403050C1 (de) * 1994-01-28 1995-09-28 Mannesmann Ag Stranggießkokille zum Führen von Strängen

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"CSP - DAS NEUE GIESS- UND WALZVERFAHREN", MAN FORSCHEN PLANEN BAUEN, no. 19, 1988, pages 36 - 41, XP000051380 *
EHRENBERG H -J ET AL: "GIESSEN UND GIESSWALZEN DUNNER BRAMMEN BEI DER MANNESMANNROHREN-WERKE AG", STAHL UND EISEN, no. 9/10, 16 May 1989 (1989-05-16), pages 453(87) - 462(96), XP000068364 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105945248A (zh) * 2016-06-21 2016-09-21 燕山大学 一种直弧型连铸机的蠕变弯曲蠕变矫直方法
CN105945248B (zh) * 2016-06-21 2018-01-23 燕山大学 一种直弧型连铸机的蠕变弯曲蠕变矫直方法
CN109093084A (zh) * 2018-09-29 2018-12-28 东北大学 一种连铸薄板坯的生产方法
CN116020987A (zh) * 2023-01-30 2023-04-28 东北特殊钢集团股份有限公司 高合工钢Cr12MoV系列的连铸方法
CN116020987B (zh) * 2023-01-30 2024-05-10 东北特殊钢集团股份有限公司 高合工钢Cr12MoV系列的连铸方法

Also Published As

Publication number Publication date
DE59709405D1 (de) 2003-04-03
ES2193319T3 (es) 2003-11-01
ATE233143T1 (de) 2003-03-15
EP0920938B1 (fr) 2003-02-26

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