EP1088610A1 - Procédé et installation pour la production d'un produit en acier coulé en continu - Google Patents

Procédé et installation pour la production d'un produit en acier coulé en continu Download PDF

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Publication number
EP1088610A1
EP1088610A1 EP00121082A EP00121082A EP1088610A1 EP 1088610 A1 EP1088610 A1 EP 1088610A1 EP 00121082 A EP00121082 A EP 00121082A EP 00121082 A EP00121082 A EP 00121082A EP 1088610 A1 EP1088610 A1 EP 1088610A1
Authority
EP
European Patent Office
Prior art keywords
strand
deformation
profile elevation
elevation
trapezoidal
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.)
Withdrawn
Application number
EP00121082A
Other languages
German (de)
English (en)
Inventor
Hans Streubel
Jürgen Dr. Lemke
Horst Grothe
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 Demag 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 Demag AG filed Critical SMS Demag AG
Publication of EP1088610A1 publication Critical patent/EP1088610A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a method for producing continuously cast Steel products in a continuous caster, which includes a deformation step of the cast product in the area of residual solidification of the strand.
  • the invention relates to a continuous casting device for this purpose, comprising a mold as well as means arranged along the continuous casting track and movable relative to one another to deform the peeled cast product. Such - minor - deformation is also called soft reduction known.
  • the continuously cast strand solidifies over the formation a fixed strand shell in the mold to be used during the subsequent Solidify pulling process towards the middle of the strand. It comes on the solidification front to enrichment of alloying elements. Cause this in the solidified strand nuclear segregation, which in turn for inhomogeneities and uneven properties over the strand cross section and thus in End product are responsible. Leading bridging occurs Core porosities. Furthermore, the metallic shrinkage can decrease Temperature lead to internal stresses, which in turn cause cracks can.
  • the core density is known as the method of soft reduction, in which there is too a slight rolling of the not yet completely solidified strand and with it comes the still liquid core.
  • German patent application 1 602 127 a procedure for elimination described by internal defects of cast products, which in particular at Semi-finished product is used.
  • the inner parts of the semi-finished product by exerting a pressure on only a part of at least one side surface of the semi-finished product compressed, the parts not exposed to the pressure of the semi-finished product can resist a change in shape and thus prevent at least partial stretching.
  • the Block also cast with partial bulges on one or more sides can be that when pressing or rolling while compressing the inner parts be pushed in. These bulges may only be so large that the parts that are not deformed by the tool or the rollers have sufficient resistance against an extension. Certain concrete geometric shapes are not specified for the bulges.
  • the object of the present invention is a method and a Device of the type mentioned for the manufacture of continuous casting products with a reduced degree of core segregation and a high degree of core compression to accomplish.
  • the respective extruded profile elevation is - viewed in cross section - essentially trapezoidal shape with - for billet, block and slab formats mutually parallel base sides a, b, the short base side a of the trapezoid forms the contact surface between the strand and the deforming agent.
  • Deformers can be rolls or rollers. It was determined, that just the formation of the strand cross-sectional shape with trapezoidal Exaggerated profiles offer very good properties for core compaction.
  • the cross section of a according to a first embodiment of the method manufactured strand corresponds to the long base side b of the trapezoidal profile elevation roughly the basic format of the strand cross section, starting from Billet, block or slab formats.
  • the strand produced is the long base side b of the trapezoidal profile elevation smaller than the basic format of the strand cross-section for billet, block and Slab formats.
  • This is advantageous because the core compression is beneficial impacting trapezoidal cross-sectional geometry over a plurality of forming stitches in the case of soft reduction, essentially down to the last forming stitch is retained, i.e. the trapezoidal profile elevation changes its height, in but not their trapezoidal basic shape. With such a geometry of the strand takes place even at the last stitch of the deformation process still a clear core forming and thus ⁇ compression instead. Because of the change in height there is also the advantage that the strand profiling after Soft reduction is essentially eliminated, i.e. adapted to the basic strand format is. The height of the trapezoid depends on the strand dimensions and the number of forming stitches.
  • a third embodiment of the method manufactured strand are the transitions between the base side a of each trapezoidal profile elevation and the two non-parallel sides c, d curved. Large radii of curvature are preferred.
  • This embodiment serves in particular for the practical implementation of the optimized profiling form with a trapezoidal profile elevation, the long base b is smaller than the basic strand format.
  • the strand has both on its loose side as well as a trapezoidal profile elevation on its fixed side.
  • Lot and Fixed side of the strand are dependent on the arrangement of the "fixed” or “loose” Rolls to strand defined. The tested roles are about a corresponding one Scaffold anchored to the foundation, while the loose casters are dependent adjustable from fixed rollers to variation of a defined roller gap are.
  • the long base side b roughly the basic format of the Corresponds to strand cross section or that the base side b is smaller than that Basic format.
  • the deformation step be in one or in up to three Partial deformation steps takes place.
  • the first deformation step have a higher degree of deformation than in the subsequent forming passes, the beneficial effect of the optimally trapezoidal design of the profile elevation to take advantage of.
  • Another preferred sequence of steps is implementation of two relativ then relatively strong - even forming stitches. Just that second sequence of steps leads to the profiling at the end of the forming process is no longer available.
  • Figure 1 shows the cross section of a strand block 1, here from the block format of 430 (width) x 320 (thickness) mm.
  • the block has a trapezoidal shape on its loose side Profile elevation 5 on.
  • the long side b of the trapezoid corresponds to the Block width B of 430 mm.
  • the short side a corresponds to approximately 1/3 of the block width B.
  • the two non-parallel sides of the trapezoid are labeled c and d.
  • the profile elevation has the height h.
  • the opposite are for deformation Rollers 2 on the loose side and roller 3 on the fixed side are provided here exemplarily shown as a pair of rollers in cross section.
  • the core inside which during the slight influence of deformation in the molten state specifically pressed under pressure on the profile elevation of the strand is marked with 4.
  • FIG. 2 The parts of FIG. 2 which correspond to those of FIG. 1 are the same Reference numerals.
  • the trapezoidal profile elevation 6 of The strand cross section according to FIG. 2 differs in terms of that according to Figure 1 in the length of the long side b of the trapezoid, designated b ' becomes.
  • the length of the short side a of the trapezoid is unchanged.
  • Profiling shows advantages in the introduction of force into the core interior 4 as well at the higher degree of rollback at the end of the deformation range.
  • the shorter sides compared to FIG. 1 are designated c 'and d'.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP00121082A 1999-09-29 2000-09-28 Procédé et installation pour la production d'un produit en acier coulé en continu Withdrawn EP1088610A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19946549 1999-09-29
DE1999146549 DE19946549A1 (de) 1999-09-29 1999-09-29 Verfahren zum Herstellen von stranggegossenen Stahlerzeugnissen sowie Stranggießvorrichtung hierzu

Publications (1)

Publication Number Publication Date
EP1088610A1 true EP1088610A1 (fr) 2001-04-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00121082A Withdrawn EP1088610A1 (fr) 1999-09-29 2000-09-28 Procédé et installation pour la production d'un produit en acier coulé en continu

Country Status (2)

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EP (1) EP1088610A1 (fr)
DE (1) DE19946549A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1466682A1 (fr) * 2003-03-28 2004-10-13 SMS Demag Aktiengesellschaft Dispositif de coulee continue de metaux fluides comportant une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide
CN110252981A (zh) * 2019-06-10 2019-09-20 邢台钢铁有限责任公司 减轻轴承钢大方坯内部质量缺陷的连铸工艺
CN110523942A (zh) * 2019-08-29 2019-12-03 邢台钢铁有限责任公司 一种改善高碳铬轴承钢大方坯内部缺陷的控制方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02121760A (ja) * 1988-10-28 1990-05-09 Kawasaki Steel Corp 連続鋳造における鋳片ストランドの連続鍛圧方法
US5348075A (en) * 1988-06-16 1994-09-20 Davy (Distington) Limited The manufacture of thin metal slab
JPH1052743A (ja) * 1996-08-08 1998-02-24 Sumitomo Metal Ind Ltd 連続鋳造鋳片のコーナー部表面割れ防止方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5348075A (en) * 1988-06-16 1994-09-20 Davy (Distington) Limited The manufacture of thin metal slab
JPH02121760A (ja) * 1988-10-28 1990-05-09 Kawasaki Steel Corp 連続鋳造における鋳片ストランドの連続鍛圧方法
JPH1052743A (ja) * 1996-08-08 1998-02-24 Sumitomo Metal Ind Ltd 連続鋳造鋳片のコーナー部表面割れ防止方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 351 (M - 1003) 30 July 1990 (1990-07-30) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 06 30 April 1998 (1998-04-30) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1466682A1 (fr) * 2003-03-28 2004-10-13 SMS Demag Aktiengesellschaft Dispositif de coulee continue de metaux fluides comportant une coquille pour la coulee continue de metaux liquides, en particulier d'acier liquide
EP1839776A2 (fr) * 2003-03-28 2007-10-03 SMS Demag AG Installation de coulée continue dotée d'une coquille de coulée continue destinée à couler des métaux liquides, en particulier, l'acier
EP1839776A3 (fr) * 2003-03-28 2008-12-10 SMS Demag AG Installation de coulée continue dotée d'une coquille de coulée continue destinée à couler des métaux liquides, en particulier, l'acier
CN110252981A (zh) * 2019-06-10 2019-09-20 邢台钢铁有限责任公司 减轻轴承钢大方坯内部质量缺陷的连铸工艺
CN110523942A (zh) * 2019-08-29 2019-12-03 邢台钢铁有限责任公司 一种改善高碳铬轴承钢大方坯内部缺陷的控制方法
CN110523942B (zh) * 2019-08-29 2021-11-23 邢台钢铁有限责任公司 一种改善高碳铬轴承钢大方坯内部缺陷的控制方法

Also Published As

Publication number Publication date
DE19946549A1 (de) 2001-04-05

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