EP0492264A1 - Mold for continuous steel casting - Google Patents

Mold for continuous steel casting Download PDF

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Publication number
EP0492264A1
EP0492264A1 EP91121134A EP91121134A EP0492264A1 EP 0492264 A1 EP0492264 A1 EP 0492264A1 EP 91121134 A EP91121134 A EP 91121134A EP 91121134 A EP91121134 A EP 91121134A EP 0492264 A1 EP0492264 A1 EP 0492264A1
Authority
EP
European Patent Office
Prior art keywords
continuous casting
casting mold
working coating
mold according
mold
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
EP91121134A
Other languages
German (de)
French (fr)
Other versions
EP0492264B1 (en
Inventor
Günter Dr. Flemming
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
Publication of EP0492264A1 publication Critical patent/EP0492264A1/en
Application granted granted Critical
Publication of EP0492264B1 publication Critical patent/EP0492264B1/en
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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the invention relates to a continuous steel casting mold, the walls of which consist of a base body provided with cooling channels made of alloyed copper and a working coating located thereon.
  • the invention is based on the knowledge that local high voltage peaks on the surface due to expansion hindrance lead to damage, especially cracking.
  • the tendency to crack formation and crack propagation is increased by brass formation due to the diffusion of zinc into the work surface.
  • the object of the invention is to provide a steel strip casting mold with broad side walls forming an upper extension, the mold walls having improved wear resistance and service life, in particular good resistance to cracking and dimensional stability, under the higher demands due to the species.
  • the object is achieved according to the invention in that, in the case of a mold for the continuous casting of thin slabs, the broad side walls of which form an enlarged pouring area and the base bodies are provided with a pure copper layer of at least 0.2 mm thick.
  • the intermediate layer of pure copper according to the invention brings about rapid heat dissipation due to its high thermal conductivity and thus a reduction in the surface temperature.
  • the toughness of the pure copper resists crack propagation, which protects the cold-hardened base body, which is made of alloyed copper, from destruction. This success cannot be achieved by the known intermediate layers applied for nickel plating with a thickness of less than 10 ⁇ m.
  • the pure copper layer can form a working layer with a thickness of 1-8 mm on the base body, the toughness of this material resisting cracking and widening of cracks.
  • the constant wear counteracts the formation of brass.
  • the pure copper layer forms a 0.2-0.4 mm thick base acting as a barrier for a wear-resistant working coating.
  • the working coating applied to the intermediate layer can consist of nickel, chromium, molybdenum or their alloys or of metal ceramic.
  • the intermediate layer and working coating can be applied in a known manner electrolytically or by spraying.
  • a steel strip casting mold consists of two broad side walls 1, 2 and two narrow side walls 3, 4 arranged between them.
  • the wide side walls 1, 2 form an enlarged pouring area 6 for receiving an immersion pouring tube 5, which extends over part of the mold height.
  • the mold wall has a base body 8 provided with cooling channels 7.
  • the base body 8 is provided with a working coating 9 made of pure copper.
  • the base body 8 is provided with an intermediate layer 10 made of pure copper as the basis for a working coating 11.
  • the working coating 11 advantageously consists of nickel or metal ceramic.

Abstract

In a mould for the continuous casting of steel strip, the walls (1, 2) comprise a main body (8) of alloy copper provided with cooling channels (7) and a working coating (9, 10) on the said main body. <??>To provide a mould for the continuous casting of steel strip which has improved wear resistance and good insensitivity to cracking, the main bodies (8) of the walls (1, 2) are provided with a layer of pure copper at least 0.2 mm thick. <IMAGE>

Description

Die Erfindung betrifft eine Stahlstranggießkokille, deren Wände aus einem mit Kühlkanälen versehenen Grundkörper aus legiertem Kupfer und einer auf diesem befindlichen Arbeitsbeschichtung bestehen.The invention relates to a continuous steel casting mold, the walls of which consist of a base body provided with cooling channels made of alloyed copper and a working coating located thereon.

Die wesentlichen Forderungen an Stahlstranggießkokillen sind gute Wärmeleitfähigkeit, Verschleißfestigkeit und Formstabilität. Unter dieser Zielsetzung wurden Stranggießkokillen mit formgebenden Wänden aus Reinkupfer, legiertem Kupfer und aus mit Chrom und Nickel beschichtetem Kupfer entwickelt.The essential requirements for continuous steel casting molds are good thermal conductivity, wear resistance and dimensional stability. Continuous casting molds with shaping walls made of pure copper, alloyed copper and copper coated with chrome and nickel were developed with this objective in mind.

Durch die EP-A-0 383 934 sind Stahlstranggießkokillen bekannt, deren aus Kupfer oder Kupferlegierung bestehende Wände an der Arbeitsseite mit einer Beschichtung aus Nickellegierung versehen sind. Zum Abflachen der Härtegradunterschiede zwischen der Kupferwand und der sehr harten Nickellegierungsschicht und zur Verbesserung der Bindung ist zwischen der Kupferwand und der Nickellegierungsschicht eine Zwischenschicht aus Nickel angeordnet.From EP-A-0 383 934 steel continuous casting molds are known, the walls of which consist of copper or copper alloy are provided on the working side with a coating of nickel alloy. An intermediate layer of nickel is arranged between the copper wall and the nickel alloy layer in order to flatten the differences in hardness between the copper wall and the very hard nickel alloy layer and to improve the bond.

Bei den in neuerer Zeit entwickelten Stranggießanlagen zum Gießen von Stahlbändern unterliegen die dabei eingesetzten Kokillen aufgrund höherer Gießgeschwindigkeit und komplexer Gestalt des Formraumes erheblich höheren Beanspruchungen durch Verschleiß, Spannungsverzug und Rißbildung.In the more recently developed continuous casting plants for the casting of steel strips, the molds used are subject to considerably higher stresses due to wear, tension distortion and cracking due to the higher casting speed and the complex shape of the mold space.

Die Erfindung beruht auf der Erkenntnis, daß örtliche hohe Spannungsspitzen an der Oberfläche durch Dehnungsbehinderung zu Schäden insbesondere zur Rißbildung führen. Dabei wird die Tendenz zur Rißbildung und Rißausbreitung verstärkt durch Messingbildung infolge des Eindiffundieren von Zink in die Arbeitsfläche.The invention is based on the knowledge that local high voltage peaks on the surface due to expansion hindrance lead to damage, especially cracking. The tendency to crack formation and crack propagation is increased by brass formation due to the diffusion of zinc into the work surface.

Aufgabe der Erfindung ist die Schaffung einer Stahlbandgießkokille mit eine obere Erweiterung bildenden Breitseitenwänden, wobei die Kokillenwände unter der artbedingten höheren Beanspruchung eine verbesserte Verschleißfestigkeit und Standzeit insbesondere gute Rißunempfindlichkeit und Formstabilität aufweisen.The object of the invention is to provide a steel strip casting mold with broad side walls forming an upper extension, the mold walls having improved wear resistance and service life, in particular good resistance to cracking and dimensional stability, under the higher demands due to the species.

Die gestellte Aufgabe wird nach der Erfindung dadurch gelöst, daß bei einer Kokille zum Stranggießen von Dünnbrammen deren Breitseitenwände einen erweiterten Eingießbereich formen, die Grundkörper mit einer Reinkupferschicht von mindestens 0,2 mm Dicke versehen sind.The object is achieved according to the invention in that, in the case of a mold for the continuous casting of thin slabs, the broad side walls of which form an enlarged pouring area and the base bodies are provided with a pure copper layer of at least 0.2 mm thick.

Die erfindungsgemäße Zwischenschicht aus Reinkupfer bewirkt durch ihre hohe Wärmeleitfähigkeit eine schnelle Wärmeableitung und damit eine Verringerung der Oberflächentemperatur. Die Zähigkeit des Reinkupfers widersteht der Rißausbreitung wodurch der aus legiertem Kupfer bestehende, kaltverfestigte Grundkörper vor Zerstörung geschützt wird. Dieser Erfolg kann durch die bekannten zum Vernickeln aufgetragenen unter 10µm starken Zwischenschichten nicht erreicht werden.The intermediate layer of pure copper according to the invention brings about rapid heat dissipation due to its high thermal conductivity and thus a reduction in the surface temperature. The toughness of the pure copper resists crack propagation, which protects the cold-hardened base body, which is made of alloyed copper, from destruction. This success cannot be achieved by the known intermediate layers applied for nickel plating with a thickness of less than 10 µm.

Die Reinkupferschicht kann eine Arbeitsschicht von 1 - 8 mm Dicke auf dem Grundkörper bilden, wobei die Zähigkeit dieses Materials der Rißbildung und Ausweitung von Rissen widersteht. Der stetige Verschleiß wirkt der Messingbildung entgegen.The pure copper layer can form a working layer with a thickness of 1-8 mm on the base body, the toughness of this material resisting cracking and widening of cracks. The constant wear counteracts the formation of brass.

Ein besonderer Vorteil wird nach der Erfindung darin gesehen, daß die Reinkupferschicht eine als Sperre wirkende 0,2 - 0,4 mm Dicke Unterlage für eine verschleißfeste Arbeitsbeschichtung bildet.According to the invention, a particular advantage is seen in the fact that the pure copper layer forms a 0.2-0.4 mm thick base acting as a barrier for a wear-resistant working coating.

Die auf der Zwischenschicht aufgebrachte Arbeitsbeschichtung kann aus Nickel, Chrom, Molybdän oder deren Legierungen oder aus Metallkeramik bestehen. Das Aufbringen der Zwischenschicht und Arbeitsbeschichtung kann in bekannter Weise elektrolytisch oder durch Aufspritzen erfolgen.The working coating applied to the intermediate layer can consist of nickel, chromium, molybdenum or their alloys or of metal ceramic. The intermediate layer and working coating can be applied in a known manner electrolytically or by spraying.

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen

Fig. 1
die Draufsicht einer Stahlbandgießkokille mit erweitertem Eingießbereich,
Fig. 2
einen senkrechten Schnitt durch die Stahlbandgießkokille gemäß der Linie II-II in Fig. 1,
Fig. 3
einen Teilschnitt der Kokillenwandoberseite
und
Fig. 4
einen Teilschnitt der Kokillenwandoberseite mit alternativer Beschichtung.
In the drawing, an embodiment of the invention is shown. Show it
Fig. 1
the top view of a steel strip casting mold with an enlarged pouring area,
Fig. 2
2 shows a vertical section through the steel strip casting mold according to line II-II in FIG. 1,
Fig. 3
a partial section of the mold wall top
and
Fig. 4
a partial section of the upper mold wall with an alternative coating.

Gemäß den Figuren 1 und 2 besteht eine Stahlbandgießkokille aus zwei Breitseitenwänden 1, 2 und zwei zwischen diesen angeordneten Schmalseitenwänden 3, 4. Die Breitseitenwände 1, 2 bilden zur Aufnahme eines Tauchgießrohres 5 einen erweiterten Eingießbereich 6, der sich über einen Teil der Kokillenhöhe erstreckt. Die Kokillenwand weist einen mit Kühlkanälen 7 versehenen Grundkörper 8 auf.According to FIGS. 1 and 2, a steel strip casting mold consists of two broad side walls 1, 2 and two narrow side walls 3, 4 arranged between them. The wide side walls 1, 2 form an enlarged pouring area 6 for receiving an immersion pouring tube 5, which extends over part of the mold height. The mold wall has a base body 8 provided with cooling channels 7.

Bei der Ausführung gemäß Fig. 3 ist der Grundkörper 8 mit einer Arbeitsbeschichtung 9 aus Reinkupfer versehen.In the embodiment according to FIG. 3, the base body 8 is provided with a working coating 9 made of pure copper.

Bei der alternativen Ausführung gemäß Fig. 4 ist der Grundkörper 8 mit einer Zwischenschicht 10 aus Reinkupfer als Grundlage für eine Arbeitsbeschichtung 11 versehen. Hierbei besteht die Arbeitsbeschichtung 11 vorteilhaft aus Nickel oder Metallkeramik.In the alternative embodiment according to FIG. 4, the base body 8 is provided with an intermediate layer 10 made of pure copper as the basis for a working coating 11. Here, the working coating 11 advantageously consists of nickel or metal ceramic.

In beiden Ausführungsbeispielen wird die Rißbildung und das Rißwachstum in dem Grundkörper 8 verhindert.In both exemplary embodiments, crack formation and crack growth in the base body 8 are prevented.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt.The invention is not restricted to the exemplary embodiments shown.

Claims (7)

Stahlstranggießkokille, deren Wände aus einem mit Kühlkanälen versehenen Grundkörper aus legiertem Kupfer und einer auf diesem befindlichen Arbeitsbeschichtung bestehen,
dadurch gekennzeichnet,
daß bei einer Kokille zum Stranggießen von Dünnbrammen deren Breitseitenwände (1, 2) einen erweiterten Eingießbereich (6) formen, die Grundkörper (8) mit einer Reinkupferschicht von mindestens 0,2 mm Dicke versehen sind.Continuous steel casting mold, the walls of which consist of a base body made of alloy copper provided with cooling channels and a working coating located thereon,
characterized by
that in the case of a mold for the continuous casting of thin slabs, the broad side walls (1, 2) of which form an enlarged pouring area (6), the base bodies (8) are provided with a pure copper layer of at least 0.2 mm thickness. Stahlstranggießkokille nach Anspruch 1,
dadurch gekennzeichnet,
daß eine Reinkupferschicht von 1 - 8 mm Dicke die Arbeitsbeschichtung (9) ist.Continuous casting mold according to claim 1,
characterized by
that a pure copper layer of 1-8 mm thick is the working coating (9). Stahlstranggießkokille nach Anspruch 1,
dadurch gekennzeichnet,
daß eine Reinkupferschicht von 0,2 - 0,4 mm Dicke eine Unterlage (10) für die Arbeitsbeschichtung (11) bildet.Continuous casting mold according to claim 1,
characterized by
that a pure copper layer of 0.2 - 0.4 mm thick forms a base (10) for the working coating (11). Stahlstranggießkokille nach den Ansprüchen 1 und 3,
dadurch gekennzeichnet,
daß die Arbeitsbeschichtung (11) im wesentlichen aus Nickel besteht.Continuous casting mold according to claims 1 and 3,
characterized by
that the working coating (11) consists essentially of nickel. Stahlstranggießkokille nach den Ansprüchen 1 und 3,
dadurch gekennzeichnet,
daß die Arbeitsbeschichtung (11) im wesentlichen aus Chrom besteht.Continuous casting mold according to claims 1 and 3,
characterized by
that the working coating (11) consists essentially of chrome. Stahlstranggießkokille nach den Ansprüchen 1 und 3,
dadurch gekennzeichnet,
daß die Arbeitsbeschichtung (11) im wesentlichen aus Molybdän besteht.Continuous casting mold according to claims 1 and 3,
characterized by
that the working coating (11) consists essentially of molybdenum. Stahlstranggießkokille nach den Ansprüchen 1 und 3,
dadurch gekennzeichnet,
daß die Arbeitsbeschichtung (11) aus Metallkeramik besteht.Continuous casting mold according to claims 1 and 3,
characterized by
that the working coating (11) consists of metal ceramic.
EP91121134A 1990-12-24 1991-12-10 Mold for continuous steel casting Expired - Lifetime EP0492264B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041830 1990-12-24
DE4041830A DE4041830A1 (en) 1990-12-24 1990-12-24 STEEL MOLDING CHOCOLATE

Publications (2)

Publication Number Publication Date
EP0492264A1 true EP0492264A1 (en) 1992-07-01
EP0492264B1 EP0492264B1 (en) 1995-03-22

Family

ID=6421476

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91121134A Expired - Lifetime EP0492264B1 (en) 1990-12-24 1991-12-10 Mold for continuous steel casting

Country Status (4)

Country Link
US (1) US5172749A (en)
EP (1) EP0492264B1 (en)
AT (1) ATE120110T1 (en)
DE (2) DE4041830A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919777C2 (en) * 1998-10-24 2001-07-26 Sms Demag Ag Process for the production of broad side plates for continuous molds
WO2008086862A1 (en) 2007-01-18 2008-07-24 Sms Siemag Ag Die with coating
EP2393965B1 (en) 2009-09-29 2016-06-08 Egon Evertz K.G. (GmbH & CO) Die for continuous casting

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5467810A (en) * 1994-04-01 1995-11-21 Acutus Industries Continuous metal casting mold
US6419005B1 (en) 2000-06-29 2002-07-16 Vöest-Alpine Services and Technologies Corporation Mold cassette and method for continuously casting thin slabs
DE10227034A1 (en) * 2002-06-17 2003-12-24 Km Europa Metal Ag Copper casting mold

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2316450A1 (en) * 1972-04-04 1973-10-18 Commw Scient Ind Res Org CERAMIC-METAL MATERIAL AND THE MOLDING THROTTLE OR MOLD, ESPECIALLY FOR METAL STRAND FORMING
DE2822004A1 (en) * 1978-05-19 1979-11-22 Nisshin Steel Co Ltd Defect-free stainless steel slab - obtained by continuous casting with nickel, chromium, or molybdenum coated copper mould
DE3211199A1 (en) * 1982-03-26 1983-09-29 Egon 5650 Solingen Evertz Process for nickel-plating gravity-die walls
EP0149734B1 (en) * 1984-01-05 1988-04-20 Sms Schloemann-Siemag Aktiengesellschaft Continuous casting mould for steel slabs
EP0282759A1 (en) * 1987-03-18 1988-09-21 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Method for the rehabilitation of a crystallizer of a continuous casting ingot mould
EP0383934A1 (en) 1988-07-22 1990-08-29 Satosen Co., Ltd. Mold for continuously casting steel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023612A (en) * 1975-11-25 1977-05-17 Inland Steel Company Continuous casting mold and process of casting
JPS5668555A (en) * 1979-11-12 1981-06-09 Sumitomo Metal Ind Ltd Mold for continuous casting
JPS6018252A (en) * 1983-07-13 1985-01-30 Mitsubishi Heavy Ind Ltd Assembled mold for continuous casting
JPH02220736A (en) * 1989-02-23 1990-09-03 Nippon Steel Corp Continuous casting method and mold for continuous casting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2316450A1 (en) * 1972-04-04 1973-10-18 Commw Scient Ind Res Org CERAMIC-METAL MATERIAL AND THE MOLDING THROTTLE OR MOLD, ESPECIALLY FOR METAL STRAND FORMING
DE2822004A1 (en) * 1978-05-19 1979-11-22 Nisshin Steel Co Ltd Defect-free stainless steel slab - obtained by continuous casting with nickel, chromium, or molybdenum coated copper mould
DE3211199A1 (en) * 1982-03-26 1983-09-29 Egon 5650 Solingen Evertz Process for nickel-plating gravity-die walls
EP0149734B1 (en) * 1984-01-05 1988-04-20 Sms Schloemann-Siemag Aktiengesellschaft Continuous casting mould for steel slabs
EP0282759A1 (en) * 1987-03-18 1988-09-21 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Method for the rehabilitation of a crystallizer of a continuous casting ingot mould
EP0383934A1 (en) 1988-07-22 1990-08-29 Satosen Co., Ltd. Mold for continuously casting steel

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 248 (C-511)(3095) 13. Juli 1988 & JP-A-63 035 762 ( NIPPON STEEL CORP ) *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 251 (M-979)29. Mai 1990 & JP-A-2 070 357 ( NKK CORP ) 9. März 1990 *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 10 (M-51)22. Januar 1981 & JP-A-55 141 363 ( ISHIWATARI SEISAKUSHO ) 5. November 1980 *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 68 (M-67)8. Mai 1981 & JP-A-56 019 956 ( ISHIWATARI SEISAKUSHO ) 25. Februar 1981 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919777C2 (en) * 1998-10-24 2001-07-26 Sms Demag Ag Process for the production of broad side plates for continuous molds
WO2008086862A1 (en) 2007-01-18 2008-07-24 Sms Siemag Ag Die with coating
CN101583446B (en) * 2007-01-18 2012-11-21 Sms西马格股份公司 Die with coating
EP2393965B1 (en) 2009-09-29 2016-06-08 Egon Evertz K.G. (GmbH & CO) Die for continuous casting

Also Published As

Publication number Publication date
US5172749A (en) 1992-12-22
EP0492264B1 (en) 1995-03-22
DE59105001D1 (en) 1995-04-27
ATE120110T1 (en) 1995-04-15
DE4041830A1 (en) 1992-06-25

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