EP0228335A1 - Stranggiesskokille mit Warmhaube - Google Patents

Stranggiesskokille mit Warmhaube Download PDF

Info

Publication number: EP0228335A1
Authority: EP; European Patent Office
Prior art keywords: ingot mold; insert; refractory material; mold according; thermal conductivity
Prior art date: 1985-11-15
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

EP86440098A

Other languages

English (en)

French (fr)

Other versions

EP0228335B1 (de

Inventor

Michel Larrecq

Jacques Petegnief

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.)

Institut de Recherches de la Siderurgie Francaise IRSID

Original Assignee

Institut de Recherches de la Siderurgie Francaise IRSID

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.)

1985-11-15

Filing date

1986-11-06

Publication date

1987-07-08

1986-11-06 Application filed by Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID

1986-11-06 Priority to AT86440098T priority Critical patent/ATE62159T1/de

1987-07-08 Publication of EP0228335A1 publication Critical patent/EP0228335A1/de

1991-04-03 Application granted granted Critical

1991-04-03 Publication of EP0228335B1 publication Critical patent/EP0228335B1/de

2006-11-06 Anticipated expiration legal-status Critical

Status 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

Definitions

the invention relates to a vertical or substantially vertical ingot mold for the continuous casting of molten metals such as steel. More particularly, the invention relates to an ingot mold made of copper or copper alloy, with a hot head, that is to say in which the heat exchanges, at the meniscus, between the cast metal and the ingot mold are slowed down so as to to reduce the oscillation wrinkles on the cast product.
this metal insert the average thickness of which can be a few millimeters (the thickness can be uniform, or even decrease from top to bottom of the insert), is done using an expensive technique (generally plating by explosion) due to the need to obtain perfect contact between the metal insert and the wall of the mold.
This necessity results in particular from the fact that any non-zero contact thermal resistance introduces a predetermined and non-reproducible datum into the overall thermal resistance of the mold.
these ingot molds often include a surface wear coating of nickel intended to avoid the formation of star cracks in the cast product: the addition of a thermal contact resistance risks bringing the nickel to a close temperature. of its limit around 600 ° C (temperature metal thickness near the wall: around 1540 ° C).
the object of the invention is to propose a new type of insert for an ingot mold with a hot head, which does not have the above-mentioned drawbacks.
the insert about 10 to 20 cm long, is constituted by a thin deposit of a refractory material with low thermal conductivity having good resistance to thermal shock, and whose thickness, taken between approximately 200 and 500 ⁇ m, is chosen so that, at the contact temperature of the metal with said deposited material, said metal in the course of solidification has a solid fraction of between 25 and 35% by weight approximately.
the inventors have in fact found that if the solid fraction at the surface of the cast metal is greater than about 35%, a thick and rigid horn is obtained by cooling in the region of the meniscus near the wall of the mold. more deform, resulting in the formation of oscillation wrinkles.
the refractory materials chosen resist temperatures of around 1800 ° C. Their thermal conductivity is preferably less than 10 W.m ⁇ 1K ⁇ 1, to be compared to conductivities of the order of 50, 100 and 300 W.m ⁇ 1K respectivement1 respectively for inserts in stainless steel, nickel and copper-silver alloy.
the small thicknesses envisaged are advantageously between 2 and 5/10 th of a mm, to be compared to a few millimeters of thickness of the metal inserts.
the refractory materials are in particular alumina (melting temperature: 2040 ° C; thermal conductivity ranging between 2 Wm ⁇ 1K ⁇ 1 and higher values depending on the treatment undergone), zirconia (melting temperature: 2700 ° C; thermal conductivity: 1 Wm ⁇ 1K ⁇ 1), boron nitride, or, so preferred, chromium carbide (melting temperature: 1800 °; thermal conductivity: 7.5 Wm ⁇ 1K ⁇ 1).
the deposition of the material is obtained by spraying in a hot powder manner, for example by means of a plasma torch or preferably a detonation gun (according to the technique marketed by the company "Union Carbon Corporation"), followed polishing.
a plasma torch or preferably a detonation gun according to the technique marketed by the company "Union Carbon Corporation"
This technique provides excellent adhesion between the support and the filler material, and a homogeneous coating free of roughness.
the deposit is made in a recess in the wall of the ingot mold, of depth equal to the thickness of the deposit, made either in the copper of the wall, or in the surface coating of nickel or chromium if one is provided. .
the copper wall 1 has a recess 2 of 3/10 th mm in thickness and about fifteen centimeters in height covering the region of the meniscus taking account of the oscillations on the one hand and possible variations in average level.
the recess 2 is filled with a deposit 3 of Cr3C2 obtained by projection with detonation cannon, followed by polishing.
the recess 2 ⁇ is made from the chrome coating 4, 0.3 mm thick, covering the wall 1 ⁇ of the mold.
the material 3 ⁇ is flush with the internal surface of the mold.
the graph in FIG. 3 makes it possible to compare the values of the local densities of heat flow ⁇ c extracted by the ingot mold equipped with an insert according to the invention, made of chromium carbide (curve B), with the values obtained using a conventional ingot mold. without insert (curve A).
the straight line C in broken lines located at d ⁇ 70 mm corresponds to the lower limit of the insert, which, in this particular case, and for an insert of approximately 150 mm high, indicates that the meniscus is substantially mid-height of said insert.
the two curves A and B correspond to the continuous casting of slabs with an extraction speed of 1.3 m / min.
the inventors were able to observe, by studying a mathematical model established for cooling in an ingot mold without insert, that the surface temperature of the steel in contact with the ingot mold is close to the solidus of the steel grade (1493 ° C), which indicates a significant solidification of the meniscus horn.
the inventors found that it was necessary to divide by four the heat extraction provided by the copper walls in the vicinity of the meniscus.
the density of thermal flux extracted by the ingot mold is substantially divided by a factor 4.
the density of flux extracted at the meniscus is around 2 MW / m2 (curve A), and the use of a thin chromium carbide insert brings this value to around 500 kW / m2.
Figures 4 and 5 compare the longitudinal profiles of the surface of a low carbon steel slab cast at the speed of 1.3 m / min with an oscillation frequency of 117 strokes per minute.
Figure 4 corresponds to a profile obtained by solidification against the wall of an ingot mold equipped with an insert according to the invention
Figure 5 corresponds to an equivalent profile obtained with a conventional ingot mold without insert.
the invention is not limited to the embodiments and to the applications described above by way of example.
the dimensions of the insert can be adapted to the molds and cast products.
the casting parameters extraction speed, frequency of oscillations
the mold according to the invention can be used both for continuous casting of slabs and other products (blooms).

Landscapes

Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Continuous Casting (AREA)
Coating By Spraying Or Casting (AREA)
Means For Warming Up And Starting Carburetors (AREA)
Materials For Medical Uses (AREA)
Ceramic Products (AREA)
Prostheses (AREA)
Confectionery (AREA)

EP86440098A 1985-11-15 1986-11-06 Stranggiesskokille mit Warmhaube Expired - Lifetime EP0228335B1 (de)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT86440098T ATE62159T1 (de)	1985-11-15	1986-11-06	Stranggiesskokille mit warmhaube.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR8516954A FR2590188B1 (fr)	1985-11-15	1985-11-15	Lingotiere de coulee continue a tete chaude
FR8516954		1985-11-15

Publications (2)

Publication Number	Publication Date
EP0228335A1 true EP0228335A1 (de)	1987-07-08
EP0228335B1 EP0228335B1 (de)	1991-04-03

Family

ID=9324879

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP86440098A Expired - Lifetime EP0228335B1 (de)	1985-11-15	1986-11-06	Stranggiesskokille mit Warmhaube

Country Status (7)

Country	Link
EP (1)	EP0228335B1 (de)
JP (1)	JPS62118948A (de)
AT (1)	ATE62159T1 (de)
CA (1)	CA1310170C (de)
DE (1)	DE3678549D1 (de)
ES (1)	ES2021609B3 (de)
FR (1)	FR2590188B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1992019399A1 (en) *	1991-04-27	1992-11-12	Foseco International Limited	Insert for vessels or conduits containing molten metal
GB2318314A (en) *	1996-10-15	1998-04-22	Davy Distington Ltd	Continuous casting mould with a coating of varying thickness
EP1642659A3 (de) *	2004-10-04	2006-05-24	Outokumpu Copper Products Oy	Verfahren und Vorrichtung zum Stranggiessen von Kupferlegierungen
DE10256751B4 (de)	2002-10-17	2019-09-12	Sms Group Gmbh	Stranggießkokille zum Gießen von Strängen aus Metallen, insbesondere aus Stahlwerkstoffen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CN107148322B (zh) *	2014-10-28	2019-09-03	杰富意钢铁株式会社	连续铸造用铸模及钢的连续铸造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR1517577A (fr) *	1967-04-05	1968-03-15	Ducommun Inc	Lingotière perfectionnée
FR2041714A1 (en) *	1969-05-09	1971-02-05	Inst Chernoi Metallurgii	Ingot mould for continuous steel casting
GB2157600A (en) *	1984-04-21	1985-10-30	Kabel Metallwerke Ghh	Producing continuous-casting moulds

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS5973152A (ja) *	1982-10-21	1984-04-25	Mishima Kosan Co Ltd	連続鋳造用鋳型及びその製造方法
JPS5973153A (ja) *	1982-10-21	1984-04-25	Mishima Kosan Co Ltd	連続鋳造用鋳型及びその製造方法
JPS59147751A (ja) *	1983-02-09	1984-08-24	Sumitomo Electric Ind Ltd	連続鋳造圧延方法
JPS59153550A (ja) *	1983-02-23	1984-09-01	Kawasaki Steel Corp	連続鋳造用モ−ルド

1985
- 1985-11-15 FR FR8516954A patent/FR2590188B1/fr not_active Expired
1986
- 1986-11-06 EP EP86440098A patent/EP0228335B1/de not_active Expired - Lifetime
- 1986-11-06 AT AT86440098T patent/ATE62159T1/de not_active IP Right Cessation
- 1986-11-06 DE DE8686440098T patent/DE3678549D1/de not_active Expired - Lifetime
- 1986-11-06 ES ES86440098T patent/ES2021609B3/es not_active Expired - Lifetime
- 1986-11-14 CA CA000522961A patent/CA1310170C/fr not_active Expired - Lifetime
- 1986-11-15 JP JP61272750A patent/JPS62118948A/ja active Pending

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR1517577A (fr) *	1967-04-05	1968-03-15	Ducommun Inc	Lingotière perfectionnée
FR2041714A1 (en) *	1969-05-09	1971-02-05	Inst Chernoi Metallurgii	Ingot mould for continuous steel casting
GB2157600A (en) *	1984-04-21	1985-10-30	Kabel Metallwerke Ghh	Producing continuous-casting moulds

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 180 (M-318)[1617], 18 août 1984; & JP-A-59 073 152 (MISHIMA KOUSAN K.K.) 25-04-1984 *
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 180 (M-318)[1617], 18 août 1984; & JP-A-59 073 153 (MISHIMA KOUSAN K.K.) 25-04-1984 *
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 276 (M-346)[1713], 18 décembre 1984; & JP-A-59 147 751 (SUMITOMO DENKI KOGYO K.K.) 24-08-1984 *
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 284 (M-348)[1721], 26 décembre 1984; & JP-A-59 153 550 (KAWASAKI SEITETSU K.K.) 01-09-1984 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1992019399A1 (en) *	1991-04-27	1992-11-12	Foseco International Limited	Insert for vessels or conduits containing molten metal
GB2318314A (en) *	1996-10-15	1998-04-22	Davy Distington Ltd	Continuous casting mould with a coating of varying thickness
US6176298B1 (en)	1996-10-15	2001-01-23	Davy Distington Limited	Continuous casting mould
DE10256751B4 (de)	2002-10-17	2019-09-12	Sms Group Gmbh	Stranggießkokille zum Gießen von Strängen aus Metallen, insbesondere aus Stahlwerkstoffen
EP1642659A3 (de) *	2004-10-04	2006-05-24	Outokumpu Copper Products Oy	Verfahren und Vorrichtung zum Stranggiessen von Kupferlegierungen

Also Published As

Publication number	Publication date
ATE62159T1 (de)	1991-04-15
CA1310170C (fr)	1992-11-17
EP0228335B1 (de)	1991-04-03
ES2021609B3 (es)	1991-11-16
JPS62118948A (ja)	1987-05-30
FR2590188A1 (fr)	1987-05-22
FR2590188B1 (fr)	1988-07-29
DE3678549D1 (de)	1991-05-08

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