EP0796685B1 - Verfahren und Vorrichtung zum Stranggiessen von rostfreiem austenitischem Stahl zwischen zwei beweglichen Wänden oder auf einer beweglichen Wand mit Dellen - Google Patents

Verfahren und Vorrichtung zum Stranggiessen von rostfreiem austenitischem Stahl zwischen zwei beweglichen Wänden oder auf einer beweglichen Wand mit Dellen Download PDF

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Publication number
EP0796685B1
EP0796685B1 EP97400539A EP97400539A EP0796685B1 EP 0796685 B1 EP0796685 B1 EP 0796685B1 EP 97400539 A EP97400539 A EP 97400539A EP 97400539 A EP97400539 A EP 97400539A EP 0796685 B1 EP0796685 B1 EP 0796685B1
Authority
EP
European Patent Office
Prior art keywords
equ
dimples
process according
casting
steel
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.)
Expired - Lifetime
Application number
EP97400539A
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English (en)
French (fr)
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EP0796685A1 (de
Inventor
Philippe Paradis
Jean-Michel Damasse
Christian Marchinonni
Manuel Bobadilla
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR SA
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 Thyssen Stahl AG, USINOR SA filed Critical Thyssen Stahl AG
Publication of EP0796685A1 publication Critical patent/EP0796685A1/de
Application granted granted Critical
Publication of EP0796685B1 publication Critical patent/EP0796685B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere
    • 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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

Definitions

  • the invention relates to the continuous casting of metals. More specifically, it concerns continuous casting systems for metals such as stainless steel in the form of thin strips, by solidification of the liquid metal on a movable wall or between two movable walls. These movable walls can, in particular, be formed by the lateral surfaces of one or two cylinders with a horizontal axis energetically internally cooled.
  • microcracks generally have a depth of the order of 40 ⁇ m and a opening less than or equal to 20 ⁇ m, and we note that they are associated with a range where the metal is enriched with elements which segregate at the time of solidification, such as nickel and manganese. It is therefore clear that these defects are formed moment of solidification of the steel on the cylinders. Their appearance is linked to contractions of the metal during solidification, contractions whose extent depends on the solidification path, therefore of the composition of the cast metal. The conditions of contact between the steel and the surface of the cylinders are also of great importance, in that they govern the heat transfers responsible for solidification.
  • the object of the invention is to provide steelmakers with a method for for casting austenitic stainless steels, for example (but not only) those of type SUS 304 in the form of thin strips of a few mm thick, with as little micro-cracks as possible longitudinal cracks, without having to operate on a metal liquid with a drastically low content of residual elements.
  • said movable walls are formed by the outer surfaces of two cooled cylinders with horizontal axes turning in opposite directions.
  • the invention also relates to a casting installation for the work of this process.
  • the object pursued by the invention is achieved by combining requirements concerning the composition of the metal, the roughness of the pouring surfaces and the composition of the inerting gas.
  • an austenitic stainless steel for example those of the SUS 304 type according to the AISI standard
  • the composition of which, expressed in weight percentages, is: C ⁇ 0.08%; If ⁇ 1%; Mn ⁇ 2%; P ⁇ 0.045%; S ⁇ 0.030%; Cr between 17.0 and 20.0%; Neither between 8.0 and 10.5%, must additionally meet the condition: Cr equ / Ni equ > 1.55, and preferably 1.55 ⁇ Cr equ / Ni equ ⁇ 1.70.
  • Crequ / Niequ between 1.55 and 1.70, the variations in volume linked to the ferrite-austenite transformation which begins before the end of solidification remain minimal and are easily compensated by contributions of liquid metal.
  • Crequ / Niequ is greater than 1.70, the contractions linked to the ferrite-austenite transformation begin to increase and the reduction in the microcracks becomes less significant.
  • the joined dimples must have a diameter from 100 to 1500 ⁇ m if they are at least approximately shaped circular. It is understood that they can also be more or less shaped roughly elliptical. Their dimensions must then give them a surface roughly equivalent to that of circular dimples of the type previously cited. Their depth is between 20 and 150 ⁇ m.
  • the dimples can be printed on the cylinders by the usual means known: laser machining, photoengraving, shot blasting. In the latter case in particular, it will of course that the procedure for obtaining dimples of the desired size must take into account the mechanical properties of the nickel layer which usually covers the surface of the copper ferrule of the cylinder.
  • an inert gas consisting of nitrogen (50-100%) and argon (0-50%) will be used. Excellent results are obtained with such an inert gas, used in conjunction with dimples contiguous 700 to 1500 ⁇ m in diameter and 80 to 120 ⁇ m deep, for casting a SUS 304 type stainless steel with a Cr equ / Ni equ ratio between 1.55 and 1.70.
  • Table 1 illustrates the influence of the Cr equ / Ni equ ratio of steel on the number of microcracks per dm 2 measured on a strip cast between two cylinders. The results were noted for two average diameters of dimples (600 and 1000 ⁇ m), and for an inerting gas composed of 90% nitrogen and 10% argon.
  • the compositions of the steels corresponding to the various tests are given in table 2: they are austenitic stainless steels of the SUS 304 type, the contents of residual elements of which are not particularly low.
  • Table 5 shows this influence on strips comprising a Cr equ / Ni equ ratio of 1, 63 castings on dimple cylinders with an average diameter of 1000 ⁇ m with an inerting gas composed of 90% nitrogen and 10% argon.
  • the roughness of the strip decreases when the rate of reduction of its thickness during hot rolling increases.
  • the roughness Ra usually encountered without hot rolling on the strips of the prior art are of the order of 4.5 ⁇ m at minimum: a reduction rate of 5% is therefore sufficient to obtain roughness more low under the optimal conditions of the invention.
  • the invention can be applied on casting machines on one or two movable walls of thin metal products, such as a machine casting on a single cylinder, or a casting machine between bands.
  • the essential is, for this installation, that the composition of the steel, the casting surface (s) brought into contact with the liquid metal have the roughness characteristics which have been described, and that the gaseous environment at the meniscus can also be made consistent with the scope of the claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Sewage (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (8)

  1. Verfahren zum Stranggießen eines rostfreien austenitischen Stahlbandes direkt ausgehend vom flüssigen Metall mit der Zusammensetzung in Gewichtsprozenten: C≤0,08%; Si≤1%; Mn≤2%; P≤0,045%; S≤0,030%; Cr zwischen 17,0 und 20,0%; Ni zwischen 8,0 und 10,5% auf einer Gußanlage mit einer beweglichen Wand oder zwischen zwei beweglichen Wänden, deren Außenfläche mit Dellen versehen ist und wobei der den Meniskus umgebende Bereich mit einem Neutralgas vorgegebener Zusammensetzung neutralisiert wird, mit den folgenden Schritten:
    dem flüssigen Metall wird ein Verhältnis Créqu/Niéqu von mehr als 1,55 erteilt mit: Créqu=%Cr+1,37x%Mo+1,5x%Si+2x%Nb+3x%Ti und Niéqu=%Ni+0,31x%Mn+22x%C+14,2x%N+%Cu
    es werden eine bewegliche Wand oder zwei bewegliche Wände verwendet, wobei die gesamte Oberfläche zusammenhängende Dellen aufweist, deren Durchmesser zwischen 100 und 1500 µm liegt und deren Tiefe zwischen 20 und 150 µm liegt;
    es wird ein Neutralgas verwendet, das wenigstens teilweise aus einem in Stahl löslichen Gas besteht.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis Créqu/Niéqu zwischen 1,55 und 1,70 liegt.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Dellen einen Durchmesser zwischen 700 und 1500 µm aufweisen und eine Tiefe zwischen 80 und 120 µm aufweisen.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Neutralgas aus einem Gemisch aus 50-100% Stickstoff und 0-50% Argon besteht.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Band direkt nach seinem Gießen einen Warmwalzschritt durchläuft bei einer Temperatur zwischen 800 bis 1200°C mit einem Verringerungsgrad von mehr oder gleich 5%.
  6. Verfahren nach Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die beweglichen Wände aus den äußeren Oberflächen zweier gekühlter Walzen bestehen, die sich um waagrechten Achsen gegenläufig zueinander drehen.
  7. Stranggußanlage für dünne metallische Produkte mit einer beweglichen gekühlten oder zwei beweglichen gekühlten Wänden, auf denen die Erstarrung der Produkte erfolgt, wobei die Wände Dellen aufweisen und mit einer Anordnung zur Einstellung der Zusammensetzung der gasförmigen Atmosphäre um den Meniskus herum, wobei die Dellen zusammenhängend sind und einen Durchmesser zwischen 100 und 1500 µm und eine Tiefe zwischen 20 und 150 µm aufweisen.
  8. Stranggußanlage für dünne metallische Produkte nach Anspruch 7, dadurch gekennzeichnet, daß die beweglichen Wände durch die äußeren Oberflächen zweier gekühlter Walzen gebildet werden, die sich um waagrechte Achsen gegenläufig drehen.
EP97400539A 1996-03-22 1997-03-12 Verfahren und Vorrichtung zum Stranggiessen von rostfreiem austenitischem Stahl zwischen zwei beweglichen Wänden oder auf einer beweglichen Wand mit Dellen Expired - Lifetime EP0796685B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9603545A FR2746333B1 (fr) 1996-03-22 1996-03-22 Procede de coulee continue d'une bande d'acier inoxydable austenitique sur une ou entre deux parois mobiles dont les surfaces sont pourvues de fossettes, et installation de coulee pour sa mise en oeuvre
FR9603545 1996-03-22

Publications (2)

Publication Number Publication Date
EP0796685A1 EP0796685A1 (de) 1997-09-24
EP0796685B1 true EP0796685B1 (de) 1999-09-15

Family

ID=9490409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97400539A Expired - Lifetime EP0796685B1 (de) 1996-03-22 1997-03-12 Verfahren und Vorrichtung zum Stranggiessen von rostfreiem austenitischem Stahl zwischen zwei beweglichen Wänden oder auf einer beweglichen Wand mit Dellen

Country Status (22)

Country Link
US (1) US5807444A (de)
EP (1) EP0796685B1 (de)
JP (1) JP3922401B2 (de)
CN (1) CN1067306C (de)
AT (1) ATE184523T1 (de)
AU (1) AU706394B2 (de)
BR (1) BR9701420A (de)
CA (1) CA2200543C (de)
CZ (1) CZ287017B6 (de)
DE (1) DE69700505T2 (de)
DK (1) DK0796685T3 (de)
ES (1) ES2137040T3 (de)
FR (1) FR2746333B1 (de)
GR (1) GR3032051T3 (de)
MX (1) MX9702143A (de)
PL (1) PL183032B1 (de)
RO (1) RO119286B1 (de)
RU (1) RU2182858C2 (de)
SK (1) SK282206B6 (de)
TR (1) TR199700223A2 (de)
UA (1) UA41415C2 (de)
ZA (1) ZA972474B (de)

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AT408198B (de) * 1998-03-25 2001-09-25 Voest Alpine Ind Anlagen Verfahren zum stranggiessen eines dünnen bandes sowie vorrichtung zur durchführung des verfahrens
US7073565B2 (en) 1999-02-05 2006-07-11 Castrip, Llc Casting steel strip
AUPP852599A0 (en) † 1999-02-05 1999-03-04 Bhp Steel (Jla) Pty Limited Casting steel strip
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
FR2792561B1 (fr) 1999-04-22 2001-06-22 Usinor Procede de coulee continue entre cylindres de bandes d'acier inoxydable ferritique exemptes de microcriques
FR2792560B1 (fr) * 1999-04-22 2001-06-01 Usinor Procede de coulee continue entre cylindres de bandes d'acier inoxydable austenitique d'excellente qualite de surface, et bandes ainsi obtenues
JP3534663B2 (ja) * 1999-09-28 2004-06-07 三菱重工業株式会社 薄肉鋳片鋳造装置
DE60140321D1 (de) * 2000-05-12 2009-12-10 Nippon Steel Corp Gekühlte giesswalze zum kontinuierlichen stranggiessen von dünnen produkten
KR100779574B1 (ko) * 2006-08-02 2007-11-29 주식회사 포스코 쌍롤식 박판주조기용 주조롤
US7975754B2 (en) * 2007-08-13 2011-07-12 Nucor Corporation Thin cast steel strip with reduced microcracking
AU2008100847A4 (en) * 2007-10-12 2008-10-09 Bluescope Steel Limited Method of forming textured casting rolls with diamond engraving
DE102009048165A1 (de) * 2009-10-02 2011-04-07 Sms Siemag Ag Verfahren zum Bandgießen von Stahl und Anlage zum Bandgießen
KR101239589B1 (ko) 2010-12-27 2013-03-05 주식회사 포스코 고내식 마르텐사이트 스테인리스강 및 그 제조방법
ITMI20130879A1 (it) * 2013-05-30 2014-12-01 Tenova Spa Cilindro di laminazione
KR20170048627A (ko) * 2015-10-26 2017-05-10 주식회사 포스코 쌍롤형 박판주조롤의 표면처리장치 및 방법
CN105331906A (zh) * 2015-12-02 2016-02-17 广东广青金属科技有限公司 一种含钛奥氏体不锈钢长连铸控制方法
CN109778077B (zh) * 2017-11-10 2021-01-08 大连华锐重工集团股份有限公司 一种核主泵泵壳材料的冶炼方法
CN108555023A (zh) * 2018-01-16 2018-09-21 浙江甬金金属科技股份有限公司 液晶显示器背光板用奥氏体不锈钢带的制作方法

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ATE182284T1 (de) * 1993-11-18 1999-08-15 Bhp Steel Jla Pty Ltd Giessen eines kontinuierlichen stahlbandes auf eine oberfläche mit bestimmter rauhigkeit
FR2727338A1 (fr) 1994-11-30 1996-05-31 Usinor Sacilor Dispositif de coulee continue entre cylindres a capotage d'inertage
FR2732627B1 (fr) 1995-04-07 1997-04-30 Usinor Sacilor Procede et dispositif de reglage du bombe des cylindres d'une installation de coulee de bandes metalliques

Also Published As

Publication number Publication date
DE69700505T2 (de) 2000-05-31
ES2137040T3 (es) 1999-12-01
SK282206B6 (sk) 2001-12-03
CZ287017B6 (en) 2000-08-16
AU1633697A (en) 1997-09-25
BR9701420A (pt) 1998-11-03
DE69700505D1 (de) 1999-10-21
CZ85997A3 (en) 1997-10-15
JP3922401B2 (ja) 2007-05-30
PL183032B1 (pl) 2002-05-31
MX9702143A (es) 1998-04-30
CA2200543A1 (fr) 1997-09-22
ZA972474B (en) 1997-10-02
DK0796685T3 (da) 2000-04-03
PL319109A1 (en) 1997-09-29
SK37397A3 (en) 2000-04-10
TR199700223A2 (xx) 1997-10-21
FR2746333B1 (fr) 1998-04-24
US5807444A (en) 1998-09-15
FR2746333A1 (fr) 1997-09-26
UA41415C2 (uk) 2001-09-17
CN1067306C (zh) 2001-06-20
CN1162510A (zh) 1997-10-22
ATE184523T1 (de) 1999-10-15
CA2200543C (fr) 2004-02-10
JPH09253803A (ja) 1997-09-30
GR3032051T3 (en) 2000-03-31
AU706394B2 (en) 1999-06-17
EP0796685A1 (de) 1997-09-24
RO119286B1 (ro) 2004-07-30
RU2182858C2 (ru) 2002-05-27

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