EP1124659A1 - Dispositif de coulee en continu pourvu de cylindres et procede de moulage au moyen de cylindres - Google Patents

Dispositif de coulee en continu pourvu de cylindres et procede de moulage au moyen de cylindres

Info

Publication number
EP1124659A1
EP1124659A1 EP98932450A EP98932450A EP1124659A1 EP 1124659 A1 EP1124659 A1 EP 1124659A1 EP 98932450 A EP98932450 A EP 98932450A EP 98932450 A EP98932450 A EP 98932450A EP 1124659 A1 EP1124659 A1 EP 1124659A1
Authority
EP
European Patent Office
Prior art keywords
rollers
lib
strip
liquid metal
heating system
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Withdrawn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
EP98932450A
Other languages
German (de)
English (en)
Inventor
Alfredo Poloni
Milorad Pavlicevic
Anatoly Kolesnichenko
Nuredin Kapaj
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP1124659A1 publication Critical patent/EP1124659A1/fr
Withdrawn legal-status Critical Current

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
    • B22D11/0637—Accessories therefor
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0671—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for heating or drying
    • 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
    • B22D11/0625—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 the two casting wheels being immersed in a molten metal bath and drawing out upwardly the casting strip

Definitions

  • the invention concerns a continuous casting device to produce strips of steel from molten metal and a casting method which can be employed with this device, wherein the molten metal is fed from below and the slab or strip being formed is therefore unloaded from above.
  • the invention is applied particularly, but not only, to produce steel strip with low and medium carbon content and with thicknesses varying in the range of 2.5 to 10 mm.
  • the state of the art includes equipment for the continuous casting of molten metal so as to obtain products of variable shape and size. It includes, for example, the use of ingot molds whose section defines the shape of the ingot or billet which is then sent for rolling to reduce the thickness.
  • rollers It also includes the use of equipment with large diameter, facing rollers to obtain strip to be sent to subsequent processing; the rollers have at least a section of surface which is cooled so as to determine at least a partial solidification of the skin of the strip leaving the rollers.
  • JP-A-05245594 JP-A- 01284461
  • JP-A-04009251 JP-A-63093450
  • JP-A-60137553 JP-A-05245594
  • the molten metal is cast from the top and extracted from the bottom, which in some cases can cause operating problems, such as the bulk involved, the movement of the equipment, the management of the slab or strip extracted, or other problems.
  • the present Applicant has designed, tested and embodied this invention to overcome this shortcoming of the state of the art.
  • the purpose of the invention is to provide a simple, functional and extremely efficient solution which will make possible the continuous casting, using rollers, of any type of steel, and particularly steels with low carbon content, yet ensuring high standards of quality both of the surface and internal .
  • Another purpose of the invention is to achieve a method to obtain the strip which emphasises the main purpose.
  • the rollers are arranged above a container of liquid metal and the strip is extracted upwards .
  • each roller of the casting device is immersed inside the container of liquid metal, defined on two sides by the rollers themselves, and the ribbons of liquid metal gathered by each roller are coupled and joined to each other to form the strip, substantially in the position where the two rollers are nearest.
  • the surface of the rollers for at least part of the outer arc of contact with the liquid metal, is kept heated by the appropriate means outside the roller itself.
  • internal heating means are used.
  • both internal and external heating means are used.
  • the surface temperature of the rollers is taken to at least 700°C, advantageously 750°C or more.
  • the liquid metal at its melting temperature does not suffer any heat shock which might determine the formation of cracks or micro-fissures in the surface, since the heat exchange which creates the first solidified skin of the strip is reduced.
  • the surface of the rollers is cooled, however, for the whole, or at least for a substantial part, of the arc placed in contact with the liquid metal; this is to encourage the formation of a first, at least partly solidified skin.
  • this cooling is intense along the whole surface of the roller which cooperates with the bath of molten metal.
  • the cooling is progressive, and reaches its maximum intensity at a desired distance from the point of contact between the roller and the liquid metal .
  • the strip is therefore obtained from the union of the two ribbons of liquid metal which are formed on the cooled surface of the rollers and can be extracted through the space defined by the rollers themselves.
  • the system to heat the surface of the rollers is obtained with a plurality or induction resistors, which have a high heating efficiency, for example arranged outside in an arc in cooperation with the arc of the outer roller which is in contact with the liquid metal.
  • the heating system is obtained with a plurality of resistors arranged on the circumference inside the roller; they can be activated in a controlled manner according to the circumferential position of the roller with respect to the liquid metal and are separated from each other by respective cooling water channels .
  • the roller is of the type where the cooling liquid circulates inside.
  • the liquid metal is supplied to the roller device from below and the cast product, in the form of a strip with the skin at least partly solidified, comes out in an upwards direction before being extracted and possibly returned to the horizontal by the appropriate devices .
  • the attached Figure is given as a non-restrictive example and shows a preferred embodiment of the casting device and method according to the invention.
  • the continuous casting device 10 with counter-rotating rollers 11a, lib is shown in the case of casting from below in an upwards direction where the lower part of the rollers 11a and lib is immersed in a container or tundish 12 to contain the liquid metal 13. As they rotate, the two rollers 11a and lib are immersed inside the tundish 12 and, due to the cooling of their surface in the respective ideal sector A and A' of contact with the liquid metal 13, cause the formation of two ribbons 14a and 14b, which have an at least partly solidified skin.
  • the ribbons 14a and 14b join together at the kissing point 15 to form a strip 16 which, after a possible pressing at the point of maximum proximity of the rollers 11a and lib, emerges from the rollers and is extracted and possibly returned to the horizontal by an extraction and straightening assembly 17.
  • first heating system 18 comprising a plurality of induction resistors 19 arranged in an arc in cooperation with the periphery of the relative roller 11a, lib and a second heating system 20 comprising resistors 21 arranged inside the relative roller 11a, lib which can be activated selectively.
  • the resistors 21 are activated as they gradually leave the exit limit M of the relative sector A, A' and are disactivated before they reach the entrance limit N to the sector A, AX
  • the resistors 21 are separated by cooling channels where the distribution of the water is activated in the sector A and A' and disactivated in the remaining sector of the roller. According to a variant which is not shown here, in place of the induction resistors 19 there are burners with a controlled flame.
  • the surface of the rollers is heated by means of radiancy systems using infra-red rays.
  • the heating systems 18 and 20 serve to bring the surface of the rollers 11a and lib, while they are in rotation, to a temperature of at least 700°C, advantageously 750°C and more, at the moment when they come into contact with the liquid metal 13, in such a way as to reduce the heat exchange between the surface of the roller and the first forming skin, and therefore the relative heat shock.
  • the cooling system is activated and therefore the surface temperature is returned to a much lower value, in such a way as to allow the at least partial solidification of the skin of the strip 16 in correspondence with the outlet of the rollers 11a, lib.
  • the device 10 makes it possible to obtain strip 16 from low-alloy steels with a low or medium carbon content, at the same time obtaining a high standard of quality.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

L'invention se rapporte à un dispositif de coulée en continu, pourvu de cylindres et conçu pour la fabrication de bandes d'acier, et notamment mais pas exclusivement de bandes d'acier à teneur faible à moyenne en carbone. Ce dispositif comporte une paire de cylindres contrarotatifs (11a, 11b) possédant une surface refroidie au moins en partie, une bande (16) étant formée par couplage et assemblage de la peau (14a, 14b) de métal qui se forme sur la surface refroidie des cylindres (11a, 11b) et qui est extraite par un ensemble (17) extracteur et éventuellement raidisseur, l'arc des cylindres qui se trouve en dehors du secteur de contact avec le métal liquide (13) étant au moins partiellement associé à un système de chauffage (18, 20). Le dispositif pourvu de cylindres (11a, 11b) est partiellement immergé dans un récipient (12) contenant du métal liquide situé sous les cylindres (11a, 11b) et un ensemble extracteur et éventuellement raidisseur (17), qui est disposé au dessus des cylindres (11a, 11b), permet d'extraire la bande (16) en partie supérieure. L'invention se rapporte également à un procédé de coulée en continu permettant de mouler des bandes d'acier (16) et mettant en oeuvre le dispositif décrit ci-dessus, dans lequel le bain de métal liquide (13) est situé sous les cylindres (11a, 11b) qui sont partiellement immergés et la bande (16) est extraite en partie supérieure.
EP98932450A 1997-09-10 1998-07-24 Dispositif de coulee en continu pourvu de cylindres et procede de moulage au moyen de cylindres Withdrawn EP1124659A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITGO970017 1997-09-10
ITGO970017 IT1304333B1 (it) 1997-09-10 1997-09-10 Dispositivo per colata continua a rulli e procedimentodi colata a rulli
PCT/IB1998/001128 WO1999012677A1 (fr) 1997-09-10 1998-07-24 Dispositif de coulee en continu pourvu de cylindres et procede de moulage au moyen de cylindres

Publications (1)

Publication Number Publication Date
EP1124659A1 true EP1124659A1 (fr) 2001-08-22

Family

ID=11355469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98932450A Withdrawn EP1124659A1 (fr) 1997-09-10 1998-07-24 Dispositif de coulee en continu pourvu de cylindres et procede de moulage au moyen de cylindres

Country Status (5)

Country Link
EP (1) EP1124659A1 (fr)
AU (1) AU733520C (fr)
CA (1) CA2303155A1 (fr)
IT (1) IT1304333B1 (fr)
WO (1) WO1999012677A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1314817B1 (it) * 2000-06-01 2003-01-16 Danieli Off Mecc Procedimento di colata continua a rulli e relativo dispositivo
RU2216428C2 (ru) * 2002-01-14 2003-11-20 Алтайский государственный технический университет им. И.И. Ползунова Кристаллизатор барабанный

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823762A (en) * 1973-03-21 1974-07-16 Nat Steel Corp Roll-couple, continuous-strip caster
JPS60137553A (ja) * 1983-12-23 1985-07-22 Ishikawajima Harima Heavy Ind Co Ltd 連続鋳造方法及び装置
JPS62214855A (ja) * 1986-03-14 1987-09-21 Nippon Kokan Kk <Nkk> 薄帯の製造方法
JPS6393450A (ja) * 1986-10-08 1988-04-23 Nippon Mining Co Ltd 金属板の製造方法
JPH01284461A (ja) * 1988-05-11 1989-11-15 Mitsubishi Electric Corp 金属薄板連続鋳造装置
JPH049251A (ja) * 1990-04-26 1992-01-14 Toshiba Corp クラッド板の連続鋳造装置
JPH05245594A (ja) * 1992-03-09 1993-09-24 Nippon Steel Corp 双ロール式薄板連続鋳造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9912677A1 *

Also Published As

Publication number Publication date
WO1999012677A1 (fr) 1999-03-18
IT1304333B1 (it) 2001-03-15
ITGO970017A1 (it) 1999-03-10
AU733520C (en) 2002-03-21
AU8237198A (en) 1999-03-29
CA2303155A1 (fr) 1999-03-18
AU733520B2 (en) 2001-05-17

Similar Documents

Publication Publication Date Title
US3416222A (en) Manufacture of elongate articles
US2770022A (en) Method of continuously casting molten metal
CN104259413A (zh) 一种生产大规格椭圆坯的连铸系统及连铸工艺
CA2124399A1 (fr) Bande metallique de moulage
US3391725A (en) Process and apparatus for cooling and supporting a continuous casting strand
US3971123A (en) Process of solidifying molten metal
AU733520C (en) Continuous casting device with rollers and casting method with rollers
US4911226A (en) Method and apparatus for continuously casting strip steel
RU1819188C (ru) Способ охлаждени стальных слитков при непрерывной разливке и установка дл его осуществлени
JPS5577962A (en) Continuous casting method of steel
EP0743115B1 (fr) Méthode et appareil pour la coulée continue de l&#39;acier
JPH11505476A (ja) 金属複合材料製造方法及び装置
JPH11221651A (ja) 被覆された鋳造製品を造るための方法および装置
US20030015309A1 (en) Apparatus and method for metal strip casting
US2749609A (en) Method of forming hollow metal articles
JP2955044B2 (ja) 環状鋼製品の連続鋳造方法および連続鋳造装置
AU2624188A (en) Continuous casting on a solid elongated metal strand
JP2992364B2 (ja) 環状鋼製品の連続鋳造方法および連続鋳造装置
JPS5731402A (en) Continuous manufacture of hot rolled product by directly connected continuous casting apparatus and rolling mill
EP0807476A3 (fr) Procédé et dispositif pour la coulée de bandes métalliques
JP2948671B2 (ja) 環状鋼製品の連続鋳造方法および連続鋳造装置
JPS55109549A (en) Continuous casting method of sheet
RU2198064C2 (ru) Способ получения прямоугольной заготовки и устройство для его осуществления
JP2955035B2 (ja) 環状鋼製品の連続鋳造方法および連続鋳造装置
JPS6054816B2 (ja) 水平連続鋳造用モ−ルドの冷却法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20000313

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FI FR GB GR IT LI NL SE

AX Request for extension of the european patent

Free format text: SI PAYMENT 20000313

17Q First examination report despatched

Effective date: 20020826

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20030107