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EP2066466A1 - Procédé de fabrication d'un feuillard d'acier - Google Patents

Procédé de fabrication d'un feuillard d'acier

Info

Publication number
EP2066466A1
EP2066466A1 EP07801685A EP07801685A EP2066466A1 EP 2066466 A1 EP2066466 A1 EP 2066466A1 EP 07801685 A EP07801685 A EP 07801685A EP 07801685 A EP07801685 A EP 07801685A EP 2066466 A1 EP2066466 A1 EP 2066466A1
Authority
EP
European Patent Office
Prior art keywords
steel
strip
molten steel
ppm
metallic inclusions
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
EP07801685A
Other languages
German (de)
English (en)
Other versions
EP2066466B1 (fr
EP2066466B2 (fr
Inventor
Christian Bernhard
Gerald Eckerstorfer
Gerald Hohenbichler
Bernd Linzer
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.)
SIEMENS VAI METALS Technologies GmbH
Original Assignee
Siemens VAI Metals Technologies GmbH and Co
Siemens VAI Metals Technologies GmbH Austria
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38541914&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2066466(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens VAI Metals Technologies GmbH and Co, Siemens VAI Metals Technologies GmbH Austria filed Critical Siemens VAI Metals Technologies GmbH and Co
Priority to SI200730701T priority Critical patent/SI2066466T1/sl
Priority to PL07801685T priority patent/PL2066466T3/pl
Publication of EP2066466A1 publication Critical patent/EP2066466A1/fr
Publication of EP2066466B1 publication Critical patent/EP2066466B1/fr
Application granted granted Critical
Publication of EP2066466B2 publication Critical patent/EP2066466B2/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels

Definitions

  • the invention relates to a method for the continuous production of a steel strip having at least two casting rolls and optionally laterally arranged side plates, wherein in operation between the casting rolls and the side plates, a pouring reservoir can be formed, from which molten steel melt can be applied to the casting rolls.
  • composition of a molten steel is selected such that liquid non-metallic inclusions are formed in the molten steel which remain liquid during the solidification of the steel shell and through the formation of a liquid Films on the surface of the casting rolls allow a homogeneous heat flow and thus a homogeneous cooling effect.
  • the tolerance of non-metallic inclusion melting temperature to deviations from a setpoint of the steel composition should be sufficient to ensure the presence of liquid non-metallic inclusions in the casting process in each melted melt in the industrial smelting operation.
  • the object of the invention is achieved by a method in which a molten steel with a Mn and Si content in a certain ratio and with a certain sulfur content in normal operation using a certain band forming force (roll separating force, RSF) is processed.
  • a molten steel with a Mn and Si content in a certain ratio and with a certain sulfur content in normal operation using a certain band forming force (roll separating force, RSF) is processed.
  • the invention therefore relates to a method for producing a strip-cast low carbon, Mn / Si partially annealed steel strip, wherein a molten steel is fed from a melt reservoir between at least two, with a steel belt moving and cooled casting rolls and solidifies at the casting rolls at least partially to the steel strip, characterized in that the molten steel has a sulfur content between 20 and 300 ppm and a ratio Mn / Si ⁇ 3.5 and in normal operation, the band forming force between 2 and 50 kN / m.
  • a steel strip made in this way is largely free of cracks and surface defects and has a homogeneous surface.
  • low-carbon steel strip is meant a steel strip in which the carbon content is less than 0.1% by weight.
  • the inventive composition of the molten steel ensures a low melting temperature of the non-metallic inclusions.
  • the low melting temperature causes the non-metallic inclusions in the casting process during the solidification of the steel shell on the casting rolls in the liquid state.
  • the tolerance of the melting temperature of non-metallic inclusions to deviations from a target value of the steel composition increases. This broadened composition range ensures that the molten steel has a composition that guarantees liquid non-metallic inclusions in the casting process, even if the setpoint for a particular steel composition is not exactly met in industrial smelting operations.
  • nonmetallic inclusions of an oxidic or sulfidic nature are formed in a molten steel.
  • the main components of non-metallic inclusions in Mn / Si partially annealed steel melts are MnO and SiO 2 .
  • the non-metallic inclusions consist mainly of a
  • Multiphase system with the main components MnO-SiO 2 -MnS exist. If the proportion of MnS in this multi-phase system is less than 37% by weight MnS, the melting temperature of the multiphase system is lower than the melting temperature of a multiphase system composed of the main components MnO and SiO 2 .
  • the 3-phase system MnO-SiO 2 -MnS has a ternary eutectic at approximately 1130 0 C.
  • VnS in Figure 1 The modeling of the 3-phase system MnO-Si (VMnS in Figure 1 shows that the liquidus touches the binary edge system MnO-SiO 2 at its eutectic temperature of 1251 0 C in the elektischer point and in the transition to a 3-phase system with increasing MnS At lower temperatures, the liquidus area has lifted off the edge system and exists only at minimum levels of MnS.
  • the width of the melting interval increases up to a sulfur content of about 300 ppm and then remains approximately constant.
  • FIG. 2 shows the opposite behavior of increasing hot cracking tendency and decreasing melting temperature of the nonmetallic inclusions.
  • the sulfur content recommended according to the invention in which sufficiently low melting temperatures of the non-metallic inclusions and at the same time tolerable hot cracking tendency can be achieved, can be deduced.
  • the presence of sulfur in a steel alloy results in the expansion of the 2-phase area solid / liquid, i. the melting interval, the steel alloy while lowering its solidus temperature, whereby the temperature range of the hot cracking formation between Liquid Impenetration Temperature LIT and zero ductility temperature ZDT is extended.
  • the width of the 2-phase region increases approximately linearly up to about 45 ° C. From this sulfur content, the width of the 2-phase region remains approximately constant as a result of MnS precipitation in the course of solidification with increasing sulfur content. These MnS precipitates deposit in solid form on the casting roll surfaces and thereby hinder a homogeneous heat flow or a homogeneous cooling effect, which favors the formation of surface defects and cracks. Rising sulfur content of the molten steel leads to increasing amounts of MnS precipitates and thus to the increase of surface defects and cracks.
  • the maximum sulfur content according to the invention is limited to 300 ppm.
  • a sulfur content of the molten steel below 20 ppm, lowering the melting temperature of the liquid non-metallic inclusions to multiphase systems of the major components MnO and SiO 2 is not large enough to ensure the presence of liquid nonmetallic inclusions in the casting process during the solidification of the steel shell on the casting rolls.
  • the width of the compositional range in which liquid nonmetallic inclusions are present in the multiphase system is not large enough to ensure sufficient tolerance to deviations from a setpoint of the steel composition in industrial smelting operation.
  • the sulfur content is at least 50 ppm, more preferably at least 70 ppm.
  • the upper limit of the sulfur content is preferably 250 ppm, particularly preferably 200 ppm.
  • the sulfur content of the molten steel can be brought to the desired level by desulphurisation or controlled addition of sulfur or sulfur compounds.
  • the Mn / Si ratio according to the invention must be greater than or equal to 3.5.
  • the strip forming force is the force with which the casting rolls are pressed against one another during the casting process, normalized to the width of the steel strip.
  • the band forming force has an influence on the presence of cracks and surface defects of a band-cast steel strip.
  • the higher the band forming force the more temperature inhomogeneities occur in the "kissing point" of the steel shells Such temperature inhomogeneities lead to uneven cooling of the steel strip, which can result in surface cracks
  • stresses build up in the band-cast steel strip, which also leads to cracks and may cause deteriorated mechanical properties.
  • Bandformkraft adversely affect the stability of the casting process, because at a low band forming force there is a risk that the metal shells solidified on the casting rolls are insufficiently pressed together due to inhomogeneities during solidification and the steel strip tears under its own weight that the steel shells partially or over the entire Stick to the width of the casting roll and that it comes to tears of the steel shell.
  • the size of the roller separation force during normal operation is between 5 and 250 kN / m.
  • the strip forming force is less than 50 kN / m. Since the inventive composition of the molten steel due to ensuring the occurrence of liquid non-metallic inclusions minimizes the formation of inhomogeneities during the solidification of the steel shells, such a low strip forming force can be used without risk to the stability of the casting process.
  • the crack frequency increases with increasing band forming force.
  • the lower limit for the strip forming force is 2 kN / m. Below this value, sufficient stability of the casting process is not guaranteed.
  • the band forming force is at least 5 kN / m. Its upper limit is preferably 30 kN / m.
  • the given values for the strip forming force refer to the steady-state normal operation of a casting plant, but not to the conditions when starting up the plant or for temporary extraordinary load effects.
  • the non-metallic inclusions of the molten steel have a mass fraction of Al 2 O 3 which is less than 45% by weight.
  • the forming multiphase system with the main components MnO-SiO 2 -MnS-Al 2 ⁇ 3 has a melting temperature which is lower than the melting temperature of a multiphase system of the main components MnO and SiO 2 .
  • the composition range in which liquid non-metallic inclusions exist is wider than that in the multiphase system of the main components MnO and SiO 2 .
  • the Al 2 O 3 content is adjusted by the choice of the starting materials for the preparation of the molten steel or, if appropriate, by the specific addition of Al or Al compounds.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un feuillard d'acier largement exempt de fissures et de défauts de surface, coulé en feuillard, à bas carbone, calmé au Mn/Si, à partir d'acier en fusion dont la teneur en soufre est comprise entre 20 et 300 ppm et le rapport Mn/Si est ≥ 3,5 en utilisant une force de façonnage de feuillard comprise entre 2 et 50 kN/m.
EP07801685.4A 2006-09-22 2007-08-16 Procédé de fabrication d'un feuillard d'acier Active EP2066466B2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200730701T SI2066466T1 (sl) 2006-09-22 2007-08-16 Postopek za izdelavo jeklenega traku
PL07801685T PL2066466T3 (pl) 2006-09-22 2007-08-16 Sposób wytwarzania taśmy stalowej

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0159306A AT504225B1 (de) 2006-09-22 2006-09-22 Verfahren zur herstellung eines stahlbandes
PCT/EP2007/007228 WO2008034502A1 (fr) 2006-09-22 2007-08-16 Procédé de fabrication d'un feuillard d'acier

Publications (3)

Publication Number Publication Date
EP2066466A1 true EP2066466A1 (fr) 2009-06-10
EP2066466B1 EP2066466B1 (fr) 2011-06-29
EP2066466B2 EP2066466B2 (fr) 2014-08-27

Family

ID=38541914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07801685.4A Active EP2066466B2 (fr) 2006-09-22 2007-08-16 Procédé de fabrication d'un feuillard d'acier

Country Status (16)

Country Link
US (1) US20100018665A1 (fr)
EP (1) EP2066466B2 (fr)
JP (1) JP5129253B2 (fr)
KR (1) KR101442724B1 (fr)
CN (1) CN101516544B (fr)
AT (2) AT504225B1 (fr)
AU (1) AU2007299343B2 (fr)
BR (1) BRPI0717489B1 (fr)
DK (1) DK2066466T3 (fr)
ES (1) ES2366139T5 (fr)
MX (1) MX2009002629A (fr)
PL (1) PL2066466T3 (fr)
RU (1) RU2418650C2 (fr)
SI (1) SI2066466T1 (fr)
UA (1) UA93097C2 (fr)
WO (1) WO2008034502A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7975754B2 (en) * 2007-08-13 2011-07-12 Nucor Corporation Thin cast steel strip with reduced microcracking
CN113198995A (zh) * 2021-04-25 2021-08-03 芜湖新兴铸管有限责任公司 一种包晶钢连铸坯凹陷改善控制方法

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3016632B2 (ja) † 1991-07-09 2000-03-06 日新製鋼株式会社 双ロール式連鋳機の運転制御法
JP3308102B2 (ja) * 1994-05-26 2002-07-29 キャストリップ・リミテッド・ライアビリティ・カンパニー 金属ストリップ連続鋳造方法
AUPN281195A0 (en) * 1995-05-05 1995-06-01 Bhp Steel (Jla) Pty Limited Casting steel strip
JPH09168844A (ja) * 1995-12-19 1997-06-30 Mitsubishi Heavy Ind Ltd 双ドラム式連続鋳造方法
JP3117638B2 (ja) * 1996-03-28 2000-12-18 新日本製鐵株式会社 薄帯鋳片連続鋳造方法
IT1291931B1 (it) * 1997-06-19 1999-01-21 Voest Alpine Ind Anlagen Procedimento per la produzione di nastri grezzi di colaggio in acciaio a basso contenuto di carbonio e nastri cosi' ottenibili
FR2791286B1 (fr) * 1999-03-26 2001-05-04 Lorraine Laminage Procede de fabrication de bandes en acier au carbone par coulee continue entre deux cylindres
JP4518645B2 (ja) * 2000-01-21 2010-08-04 日新製鋼株式会社 高強度高靱性マルテンサイト系ステンレス鋼板並びに冷延耳切れ抑止方法および鋼板製造法
AUPR047900A0 (en) * 2000-09-29 2000-10-26 Bhp Steel (Jla) Pty Limited A method of producing steel
UA76140C2 (en) * 2001-04-02 2006-07-17 Nucor Corp A method for ladle refining of steel
DE10125669B4 (de) * 2001-05-25 2006-04-27 Hammelmann Maschinenfabrik Gmbh Pumpe, insbesondere Plungerpumpe
MY134786A (en) * 2001-09-14 2007-12-31 Nucor Corp Casting steel strip
FR2834722B1 (fr) * 2002-01-14 2004-12-24 Usinor Procede de fabrication d'un produit siderurgique en acier au carbone riche en cuivre, et produit siderurgique ainsi obtenu
KR100489018B1 (ko) * 2002-08-30 2005-05-11 주식회사 포스코 쌍롤형 박판 주조기를 이용한 고망간강의 박판 제조 방법
AT412072B (de) * 2002-10-15 2004-09-27 Voest Alpine Ind Anlagen Verfahren zur kontinuierlichen herstellung eines dünnen stahlbandes
KR101076090B1 (ko) 2003-01-24 2011-10-21 누코 코포레이션 캐스팅 강 스트립
RU2375145C2 (ru) * 2003-10-10 2009-12-10 Ньюкор Корпорейшн Литье стальной полосы
WO2007079545A1 (fr) * 2006-01-16 2007-07-19 Nucor Corporation Bande d'acier coulé mince à microfissuration réduite
US7464746B2 (en) * 2006-08-09 2008-12-16 Nucor Corporation Method of casting thin cast strip

Non-Patent Citations (1)

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Title
See references of WO2008034502A1 *

Also Published As

Publication number Publication date
AU2007299343B2 (en) 2011-09-08
DK2066466T3 (da) 2011-10-24
US20100018665A1 (en) 2010-01-28
SI2066466T1 (sl) 2011-10-28
KR20090064462A (ko) 2009-06-18
KR101442724B1 (ko) 2014-09-23
CN101516544B (zh) 2011-06-08
AT504225A1 (de) 2008-04-15
RU2009115180A (ru) 2010-10-27
ATE514502T1 (de) 2011-07-15
UA93097C2 (uk) 2011-01-10
EP2066466B1 (fr) 2011-06-29
ES2366139T3 (es) 2011-10-17
JP2010504214A (ja) 2010-02-12
EP2066466B2 (fr) 2014-08-27
JP5129253B2 (ja) 2013-01-30
AT504225B1 (de) 2008-10-15
WO2008034502A1 (fr) 2008-03-27
CN101516544A (zh) 2009-08-26
RU2418650C2 (ru) 2011-05-20
MX2009002629A (es) 2009-03-24
AU2007299343A1 (en) 2008-03-27
BRPI0717489A2 (pt) 2013-10-15
ES2366139T5 (es) 2014-10-06
PL2066466T3 (pl) 2011-11-30
BRPI0717489B1 (pt) 2016-02-10

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