EP0596134A1 - Procede pour obtenir une piece moulee en deux couches - Google Patents

Procede pour obtenir une piece moulee en deux couches Download PDF

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Publication number
EP0596134A1
EP0596134A1 EP93909414A EP93909414A EP0596134A1 EP 0596134 A1 EP0596134 A1 EP 0596134A1 EP 93909414 A EP93909414 A EP 93909414A EP 93909414 A EP93909414 A EP 93909414A EP 0596134 A1 EP0596134 A1 EP 0596134A1
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EP
European Patent Office
Prior art keywords
molten metal
molten
tundish
pool
nozzle
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Withdrawn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
EP93909414A
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German (de)
English (en)
Inventor
Eiichi Nippon Steel Corporation Takeuchi
Masafumi Nippon Steel Corporation Zeze
Takashi Nippon Steel Corporation Sawai
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.)
Nippon Steel Corp
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Nippon Steel Corp
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Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0596134A1 publication Critical patent/EP0596134A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • 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
    • B22D11/007—Continuous casting of metals, i.e. casting in indefinite lengths of composite ingots, i.e. two or more molten metals of different compositions being used to integrally cast the ingots
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires

Definitions

  • the present invention relates to a process for continuously casting a double-layered slab whose surface layer and internal layer are composed of steel compositions different from each other, wherein two kinds of molten steels having compositions different from each other are poured into an upper molten steel pool and a lower molten steel pool, respectively, both pools being separated by a direct current magnetic field zone provided within a mold or at a lower site thereof.
  • the present inventors have heretofore proposed and practiced a process for producing a double-layered slab whose surface layer and internal layer are composed of steel compositions different from each other, wherein the strand pool for continuous casting is separated into an upper pool and a lower pool by applying various types of direct current magnetic fields, and two kinds of molten steels having compositions different from each other are poured into the two pools through separate immersion nozzles, whereby mixing of the two kinds of steels is minimized.
  • the present inventors have proposed processes for producing slabs by using the following techniques: a technique of applying a magnetic flux zone having a uniform density in the slab width direction from one of the long sides thereof to the other as disclosed in KOKAI (Japanese Unexamined Patent Publication) No. 63-108947; a technique of applying a magnetic flux zone in the direction parallel to the drawing direction of the slab as disclosed in KOKAI (Japanese Unexamined Patent Publication) No.
  • a double-layered slab is produced in principle by the following procedures: two kinds of molten steels are prepared by such an equipment having a function for adjusting the compositions of the steels as a converter, an electric furnace, a ladle and a vacuum degassing equipment; these steels are separately transported to a continuous casting machine, and poured into two tundishes, respectively; the two kinds of steels are fed into an upper molten steel pool and a lower molten steel pool within a mold, respectively, through two nozzles separately provided to the two tundishes; and a slab is drawn after the step of continuous casting.
  • the present inventors have already proposed a method for adjusting a molten steel composition in a molten steel pool by feeding a wire thereto in KOKAI (Japanese Unexamined Patent Publication) No. 63-108947.
  • KOKAI Japanese Unexamined Patent Publication
  • the resultant molten steel has not always had a uniform composition in this case.
  • KOKAI Japanese Unexamined Patent Publication
  • solutes are added to molten steel in the form of a wire without further processing or wire covered with a metal such as iron from the molten steel surface within a mold, and when the wire passes through a powder layer 16 or the molten portion of the powder layer 16 within the mold 1 without taking any measures, as shown in Fig. 7, a portion of the powder is expected to adhere to the wire 12A, to become molten powder 22, to be drawn into molten steel pools of molten steels 13A, 15, and to form defects within the slab.
  • the reference numeral 21 designates a solidified layer of steel adhering around powder 20.
  • a guide tube 23 made of a refractory material may be placed at the location of the molten steel surface from which the wire 12A enter the molten steel, and the wire 12A may be fed without being directly contacted with the powder layer 16. Practically, since the temperature of the molten steel around the guide tube 23 is lowered, the molten steel is solidified and adheres thereto, and as a result casting operation is sometimes hindered.
  • a technique of feeding a treating agent in a wire-form within a teeming nozzle to a molten steel to be teemed into a mold is disclosed in Japanese Unexamined Patent Publication (KOKAI) No. 51-32432.
  • this technique is used in feeding the treating agents in a wire-form in the nozzle of the ladle by passing the agents through the central through-hole of the stopper rod.
  • the molten metal flow flows out from the pouring end of the short nozzle and falls through the air onto the molten steel surface in the mold, the dissolution amount of the wire-form treating agent in the molten metal flow and the time for dissolving and mixing the treating agent are restricted. Accordingly, it is not possible to feed a large amount of the treating agent and to have a uniform dissolution concentration thereof.
  • An object of the present invention is to provide a process for casting a double-layered slab which makes the composition adjustment of molten metal such as molten steel used for the process simple, and which reduces the production cost thereof and improves the quality thereof.
  • a further object of the present invention is to provide a process for casting a double-layered slab which is capable of casting, continuously and without interruption, a slab having an outer layer and an internal layer each having a uniform composition distribution.
  • molten steel for example, is first poured into a molten metal pool formed by a mold and a dummy bar from a short nozzle and a long nozzle provided at the lower site of a tundish, and a direct current magnetic field zone which acts on the entire slab width is imposed by a magnet provided at a lower site of the mold a predetermined distance apart from the meniscus in the casting direction to separate the molten steel into an upper and a lower portion, continuous casting strand pools thus being formed. Accordingly, the front end of the short nozzle and that of the long nozzle are immersed in the two pools, respectively.
  • an alloy wire for composition adjustment is fed within one or both of the immersion nozzles, sufficiently melted therewithin and mixed with the molten steel to adjust the molten steel to have a predetermined composition.
  • the resultant molten steels each having a uniformly adjusted composition are each poured into respective pools, rapidly cooled, and solidified to cast a double-layered slab having a surface layer and an internal layer each composed of the respective metals having uniform compositions.
  • An inert gas such as Ar is blown into the molten metal flow within the nozzle from a wire insertion opening at the stopper top end or from the upper portion of the nozzle wall, and finely dispersed within the fluid, whereby there are inhibited the adhesion and deposition along the entire length of the immersion nozzle, of reaction products of dissolved substances and the molten metal within the nozzle and mutual reaction products of nozzle constituent materials and these materials. As a result, an increase in the internal flow resistance of the nozzle is prevented.
  • the lower portion of the nozzle is immersed in the molten metal, and in addition the direction of the flow path is changed at the nozzle front end, the flow resistance of the molten metal within the entire nozzle is increased, and pouring steel into the pools is liable to be hindered. Blowing an inert gas into the immersion nozzles exerts extremely significant effects on continuous casting operation over a long period of time.
  • two tundishes into which the same molten metal is poured may be arranged, and a short nozzle and a long nozzle may be provided to the respective tundishes.
  • different molten metals may naturally be poured into respective tundishes, and additive alloy wires are further fed into respective immersion nozzles connected to respective pools requiring composition adjustment.
  • Fig. 1 schematically shows the entire equipment for practicing the present invention, wherein a magnet 2 is placed at a lower site of a mold 1.
  • a direct current magnetic flux is applied in the direction vertical to the casting direction (A), namely, in the direction crossing the thickness of the mold, by the magnet to form a static magnetic field zone 2A, whereby an upper molten metal pool 1A and a lower molten metal pool 1B are formed within the mold.
  • a tundish 3 in which, for example, a molten steel 13 is stored is arranged above the mold 1.
  • To the bottom portion of the tundish are provided a short immersion nozzle 4 open to the upper pool 1A and a long immersion nozzle 5 open to the lower pool 1 B.
  • Fig. 1 shows a situation where an additive alloy wire 12 is fed into the short nozzle 4 to adjust the composition of molten steel to be poured into the upper pool 1.
  • the reference numeral 6 in Fig. 1 designates a tundish stopper for the short nozzle 4. It has a through-hole 6A for the alloy wire 12 as shown in Fig. 2 in detail, and opens and closes a tundish opening 3A.
  • a sealing mechanism 8 consisting of an inert gas sealing chamber 8A, a labyrinth seal 8B, etc.
  • the reference numerals 9, 10 and 11 designate a straightening machine for wire drawing, an alloy wire feeder and a coiler, respectively.
  • the short nozzle 4 is formed at the tundish opening 3A in such a manner that the short nozzle 4 and the tundish bottom become an integral body. If necessary, a porous refractory material 17 connected to an inert gas injection hole 18 is provided.
  • a molten steel pool is formed between the mold 1 and a dummy bar (not shown), and the stopper is opened to pour the molten steel 13 in the tundish 3 into the molten steel pool.
  • the static magnetic field zone 2A is generated to form the upper molten steel pool 1A and the lower molten steel pool 1B.
  • the alloy wire 12 is then fed into the short nozzle 4.
  • the alloy wire 12 is melted and mixed within the short nozzle 4 to have a predetermined concentration, and the resultant molten steel is poured into the upper molten steel pool 1A.
  • f is an average melting rate of the alloy wire 12
  • d is a diameter of the wire
  • V is a feed rate of the wire
  • L M is a distance from the front end of the stopper 6 which is in the state of closing the tundish opening to a meniscus 14B within the mold
  • L N is a distance from the front end of the stopper 6 to an immersion nozzle pouring hole 4A
  • L is a distance from the meniscus 16 to a central position 2B of the direct current magnetic field zone.
  • the length of the long nozzle 5 for teeming a molten steel 13A for the internal layer namely, the distance from the front end of a stopper 7 to a nozzle pouring hole 5A should be longer than the distance L of the central position 2B of the static magnetic field zone.
  • the molten steel 14 for the surface layer in the upper pool is solidified to form a solidified shell 14A, and subsequently the molten steel 13A for the internal layer is also solidified to form a solidified shell 13B.
  • a double-layered slab composed of the outer layer 14A and the internal layer 13B each having a uniform concentration distribution.
  • the inert gas for example Ar
  • an inert gas may also be blown into the molten steel from the opening for alloy wire feeding at the top end of the stopper or from the nozzle wall in the same manner as in the embodiment of Fig. 1, and finely dispersed thereinto.
  • the deposition amount of adhering material on the internal wall of the nozzle is decreased, and there can be stably produced a double-layered slab having a uniform concentration distribution in the slab peripheral direction and the slab casting direction.
  • a molten steel having an internal layer composition as listed in Table 1 and stored in a tundish was poured into a molten steel pool formed by a continuous casting-machine copper mold 1200 mm in long side and 250 mm in short side and a dummy bar to have a predetermined depth.
  • a direct current magnetic field having a uniform magnetic flux density of 5000 G in the width direction of the slab was applied at a site 0.63 m (distance L) apart from a meniscus 14B within the mold in the downward direction to form a direct current magnetic field zone 2A (central position of the direct current magnetic field being referred to as 2B).
  • the molten steel pool was thus separated into an upper portion and a lower portion in the casting direction.
  • the drawing rate (casting rate) Vc of the slab was determined to be 0.4 m/min from the following formula:
  • the flow rates of each of the molten steels were controlled by adjusting the opening degree of each of the stoppers in such a degree that the flow rate of the molten steel for the surface layer and that of the molten steel for the internal layer became 3.36 kg/sec and 11.04 kg/sec, respectively.
  • the molten steel for the surface layer was passed through a short immersion nozzle 4 while an alloy wire containing 70% of AI was being fed into the nozzle at a rate of 1.44 g/sec.
  • the AI content of the slab thus obtained became 0.032% by weight as shown in Table 1.
  • Ag gas was fed into the short nozzle at a rate of 0.5 liter/min during feeding the AI wire.
  • the double-layered slab could be stably cast for 120 minutes.
  • the AI concentration of the surface layer was uniform both in the slab peripheral direction and slab longitudinal direction, and no powder inclusion was recognized.
  • a direct current magnetic field was applied at the lower site of a continuous casting copper mold for casting a slab having a long side of 1500 mm and a short side of 200 mm, whereby the molten steel pool within the continuous casting strand was separated into an upper pool and a lower pool in the casting direction.
  • the slab which was solidified was drawn while the same molten ultra low carbon steel was being fed into each of the pools through respective nozzles different from each other in length.
  • the molten steel to be fed into the pools was stored in two tundishes, and a wire (Ti content of 70%) in which Ti alloy was sealed was fed at a rate of 38.9 g/sec into a nozzle for pouring the molten steel into the lower pool corresponding to the internal layer through a stopper 7 having a through-hole and a sealing mechanism as shown in Fig. 5.
  • the central position 2B of the direct current magnetic field is 60 cm apart from a meniscus 13C in the downward direction.
  • the magnetic flux was applied in the thickness direction of the slab, and the magnetic flux density at the central position was 5500 G.
  • the slab was cast at a rate of 1 m/min while the opening degree of the stoppers 6, 7 were controlled in such a manner that the molten steel for the surface layer and that for the internal layer were teemed into the mold at a rate of 7.75 kg/sec and 27.25 kg/sec, respectively.
  • the boundary between the upper and the lower pool was located at the central position of the direct current magnetic field zone, and the surface layer thickness reached 20 mm.
  • Ar was fed into the molten steel at a rate of 1 liter/min together with the wire from the front end of the stopper for the nozzle into which the wire was fed. Casting was stably carried out for 120 minutes, and all the molten steel was completely cast.
  • the Ti concentration distribution in the slab peripheral direction of the internal layer of the slab thus cast was 0.1% as shown in Fig. 9, which agreed with the concentration estimated from the casting conditions as mentioned above. Moreover, the Ti concentration distribution was constant in the longitudinal direction.
  • Fig. 11 shows the locations at which the Ti concentration distribution in a slab section was measured.
  • Casting a slab was carried out under the same conditions as in Example 2 except that the wire was fed into the pool for the internal layer from the powder layer within the mold without passing the wire through the stopper as shown in Fig. 7.
  • the wire was covered with iron and adjusted in such a manner that it started to be melted within the pool for the internal layer.
  • the locations at which the Ti concentration was measured were as shown in Fig. 11, and the wire was added at a location designated by the reference numeral 24.
  • the present invention provides a process wherein a molten steel having a base composition is prepared without preparing two kinds of molten steels having compositions different from each other, a wire or two wires are fed from the stopper or stoppers of a tundish or two tundishes during teeming a molten steel for the internal or surface layer, or both molten steels for the respective internal and the surface layer into a mold, the wire(s) is (are) melted and uniformly mixed within a nozzle or two nozzles, and the resultant molten steel(s) is (are) poured into a predetermined molten pool or two molten pools.
  • molten steels having desired compositions can be readily prepared.
  • the production cost of the double-layered slab can be reduced, and the quality thereof can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention se rapporte à un procédé pour produire une pièce moulée en deux couches, en injectant des métaux en fusion (13A, 14) de compositions différentes dans des creusets (1A, 1B) qui sont séparés verticalement l'un de l'autre par une zone de champ magnétique à courant continu (2A) située dans un moule de coulage (1). Ce procédé consiste à introduire un fil en alliage (12) dans un ajutage d'immersion court (4), qui est placé sur un avant-creuset de coulage en continu (3), et à faire passer ce fil à travers un passage traversant dans une butée d'avant-creuset (6), pour que le fil (12) fonde, pour que l'alliage fondu qui en résule vienne se mélanger avec un métal en fusion (13) dans l'ajutage (4) et pour qu'un métal en fusion (4) de concentration uniforme soit produit, à introduire ensuite ce métal en fusion (4) depuis un orifice de décharge de l'ajutage court (4) dans un creuset supérieur (1A), tout en introduisant un métal en fusion (13) tel qu'il se trouve depuis un ajutage d'immersion long (15) placé dans l'avant-creuset de coulage en continu (3), jusqu'à un creuset inférieur (1B), puis à refoidir et laisser solidifier les métaux en fusion dans ces creusets pour qu'ils forment une pièce coulée en deux couches.
EP93909414A 1992-04-24 1993-04-23 Procede pour obtenir une piece moulee en deux couches Withdrawn EP0596134A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP129888/92 1992-04-24
JP12988892 1992-04-24
PCT/JP1993/000530 WO1993022085A1 (fr) 1992-04-24 1993-04-23 Procede pour obtenir une piece moulee en deux couches

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EP0596134A1 true EP0596134A1 (fr) 1994-05-11

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EP93909414A Withdrawn EP0596134A1 (fr) 1992-04-24 1993-04-23 Procede pour obtenir une piece moulee en deux couches

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EP (1) EP0596134A1 (fr)
CA (1) CA2112585A1 (fr)
WO (1) WO1993022085A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420697A1 (de) * 1994-06-14 1995-12-21 Inst Verformungskunde Und Huet Verfahren und Vorrichtung zum Stranggießen eines Verbundmetallstranges
EP0819772A1 (fr) * 1996-07-19 1998-01-21 Alusuisse Technology & Management AG Appareil et procédé d'affinage et d'addition d'alliages
US6089309A (en) * 1997-04-15 2000-07-18 South China University Of Technology Method for manufacturing gradient material by continuous and semi-continuous casting
US8927113B2 (en) 2003-06-24 2015-01-06 Novelis Inc. Composite metal ingot
EP2474639A4 (fr) * 2009-08-31 2016-02-17 Nippon Steel & Sumitomo Metal Corp Feuille d'acier galvanisé à chaud très résistante et son procédé de production
EP3290881A1 (fr) * 2016-09-01 2018-03-07 Heraeus Electro-Nite International N.V. Buse d'immersion de fil optique fourré
CN108348989A (zh) * 2015-10-30 2018-07-31 新日铁住金株式会社 复层铸坯的连续铸造装置以及连续铸造方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6330542B2 (ja) * 2014-07-17 2018-05-30 新日鐵住金株式会社 連鋳鋳片の製造方法
CN107127312B (zh) * 2017-06-07 2022-11-22 山东钢铁股份有限公司 一种生产复合连铸坯的设备及方法
CN110512049B (zh) * 2019-08-16 2021-11-05 嘉兴卓十生物科技有限公司 一种全适应且使用寿命长的精炼炉进丝机挡线装置

Family Cites Families (3)

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JPS5946698B2 (ja) * 1978-11-22 1984-11-14 住友金属工業株式会社 クラツド鋼の製造法
JPS63212052A (ja) * 1987-02-26 1988-09-05 Nippon Steel Corp 連続鋳造による複合材の製造方法
JPH0475750A (ja) * 1990-07-18 1992-03-10 Nippon Steel Corp 複層鋳片の連続鋳造方法及び装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9322085A1 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420697A1 (de) * 1994-06-14 1995-12-21 Inst Verformungskunde Und Huet Verfahren und Vorrichtung zum Stranggießen eines Verbundmetallstranges
EP0819772A1 (fr) * 1996-07-19 1998-01-21 Alusuisse Technology & Management AG Appareil et procédé d'affinage et d'addition d'alliages
US6089309A (en) * 1997-04-15 2000-07-18 South China University Of Technology Method for manufacturing gradient material by continuous and semi-continuous casting
US8927113B2 (en) 2003-06-24 2015-01-06 Novelis Inc. Composite metal ingot
EP3056298A1 (fr) * 2003-06-24 2016-08-17 Novelis, Inc. Lingot composite et tole composite issue du laminage a chaud et a froid d'un tel lingot composite
EP2474639A4 (fr) * 2009-08-31 2016-02-17 Nippon Steel & Sumitomo Metal Corp Feuille d'acier galvanisé à chaud très résistante et son procédé de production
CN108348989A (zh) * 2015-10-30 2018-07-31 新日铁住金株式会社 复层铸坯的连续铸造装置以及连续铸造方法
US20180304349A1 (en) * 2015-10-30 2018-10-25 Nippon Steel & Sumitomo Metal Corporation Continuous casting apparatus and continuous casting method for multilayered slab
EP3369495A4 (fr) * 2015-10-30 2019-08-07 Nippon Steel Corporation Dispositif de fabrication en continu et procédé de fabrication en continu pour brame multicouche
US10987730B2 (en) 2015-10-30 2021-04-27 Nippon Steel Corporation Continuous casting apparatus and continuous casting method for multilayered slab
WO2018041721A1 (fr) * 2016-09-01 2018-03-08 Heraeus Electro-Nite International N.V. Buse à immersion de fil fourré optique
EP3290881A1 (fr) * 2016-09-01 2018-03-07 Heraeus Electro-Nite International N.V. Buse d'immersion de fil optique fourré
CN109642825A (zh) * 2016-09-01 2019-04-16 贺利氏电测骑士国际有限公司 光学包芯线浸入式管嘴
RU2721019C1 (ru) * 2016-09-01 2020-05-15 Хераеус Электро-Ните Интернациональ Н.В. Погружное сопло для кабеля с волоконно-оптической сердцевиной
CN109642825B (zh) * 2016-09-01 2021-02-19 贺利氏电测骑士国际有限公司 光学包芯线浸入式管嘴
US11440081B2 (en) 2016-09-01 2022-09-13 Heraeus Electro-Nite International N.V. Optical cored wire immersion nozzle

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Publication number Publication date
CA2112585A1 (fr) 1993-11-11
WO1993022085A1 (fr) 1993-11-11

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