EP0352356A1 - Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants - Google Patents
Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants Download PDFInfo
- Publication number
- EP0352356A1 EP0352356A1 EP88112281A EP88112281A EP0352356A1 EP 0352356 A1 EP0352356 A1 EP 0352356A1 EP 88112281 A EP88112281 A EP 88112281A EP 88112281 A EP88112281 A EP 88112281A EP 0352356 A1 EP0352356 A1 EP 0352356A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- casting
- steel
- air
- equipment according
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 claims abstract description 7
- 239000003517 fume Substances 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 7
- 239000012780 transparent material Substances 0.000 claims abstract description 6
- 229910000655 Killed steel Inorganic materials 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 231100000252 nontoxic Toxicity 0.000 claims description 4
- 230000003000 nontoxic effect Effects 0.000 claims description 4
- 239000002341 toxic gas Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims 1
- 239000004576 sand Substances 0.000 claims 1
- 238000011179 visual inspection Methods 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 206010039509 Scab Diseases 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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
- B22D11/10—Supplying or treating molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D45/00—Equipment for casting, not otherwise provided for
- B22D45/005—Evacuation of fumes, dust or waste gases during manipulations in the foundry
Definitions
- the object of the present invention is a process for carrying out the continuous casting of steel under such operating conditions, as to prevent the oxidation of liquid steel during all casting steps.
- a facility for continuous casting comprises a tundish, or distributor body, internally lined with a refractory material, which receives the liquid metal from a overhanging casting ladle, one or more ingot moulds or crystallizers, usually of copper, constantly cooled by water circulation, wherein a partial and quick solidification of the metal occurs, and, on line with said ingot moulds, cooling areas wherein the complete solification takes place by means of water jets.
- the bar leaving said cooling areas is made advance by means of withdrawal rolls and is then cut to the desired lengths.
- liquid steel has to be deoxidated by means of the addition of deoxidizers based on aluminum, silicon, or the like.
- ceramic shrouds are used and coating products or powders, similar to low-melting glasses in the molten state, are provided on all the exposed steel surfaces during the casting, and, more precisely on the exposed steel surface in the ingot moulds, and on the exposed steel surface inside the tundish.
- the steel cast from the ladle to the tundish and the steel cast from the tundish to the ingot mould is usually enclosed inside shrouds of ceramic material or the like, in order to prevent steel from getting oxidized during casting. It is known that such shrouds are affected by the drawback of being fragile, expensive and of requesting a replacement for each casting. Furthermore the contact between the ceramic shroud and the nozzle is poor and often there is air suction owing to Venturi effect.
- the steel is killed by means of aluminum, which, when comes into contact with atmospheric oxygen, forms aluminum oxide (Al2O3); this latter, by being solid at the temperature of liquid steel, and insoluble in this latter, causes the formation of crusts and agglomerates which clog the ducts of the casting facility, and, in particular, the nozzles positioned at the bottom of the tundish, as well as said ceramic shrouds.
- Al2O3 aluminum oxide
- a purpose of the present invention is to realize a process for the continuous casting of steel, so conceived as to obviate the drawbacks caused by the fast oxidation of steel in the presence of air and, in particular, of the aluminum for obtaining killed steels, without altering the normal operating conditions of continuous casting by one or more casting lines, and operating in free stream.
- Another purpose of the invention is to provide a process for the continuous casting of steel which can be wholly carried out in the complete absence of air oxygen, with evident advantages as regards the quality of the solidified steel, the safety of the casting facility and the saving in costs consequent to the elimination of the coating powders and of the shrouds of ceramic material, or the like.
- a further purpose of the present invention is to provide an equipment for carrying out the above-said process of continuous casting, which is structurally simple, highly reliable, and can be used both on already existing facilities, and on newly-built facilities.
- a process for carrying out the continuous casting of steel and, in particular, of killed steel, using a feeding tundish, one or more ingot moulds, means for cooling the bar in the solidification step, and means for the withdrawal of the same bar which process consists, according to the present invention, in carrying out the operating casting steps, and in particular all those casting steps in which liquid steel is in contact with air, inside a closed chamber, free from oxygen, in circulating inside said chamber at least one inert, non-toxic gas, such as nitrogen, carbon dioxide, argon and their mixtures, maintained under a slight overpressure, and in using closed-loop conditioning means in order to continuously remove from said inert gas the heat, the fumes and the vapours which are released during the casting steps.
- inert, non-toxic gas such as nitrogen, carbon dioxide, argon and their mixtures
- an equipment which is constituted by an air-tight chamber, with at least a portion of the walls of said air-tight chamber being constituted by a transparent material, so designed as to enclose all those portions of the casting facility in which liquid steel is in contact with atmosphere, means being provided for maintaining inside said chamber an atmosphere of nitrogen, or of another inert, non-toxic gas, such as carbon dioxide, argon, and their mixtures, under a slight overpressure and free from oxygen, as well as closed-loop conditioning means being provided, in order to remove from said inert gas the heat, the fumes and the vapours released during the casting process, with said chamber means of connection with the external atmosphere being furthermore associated, in order to allow attending personnel, equipped with a breathing mask, to enter the chamber in order to control the casting process or to control the process by means of tight gloves, handling means and the like.
- said air-tight chamber is preferably provided with at least one wall fully made from a transparent material, and with at least one other wall made from a fast-breakage material, for emergency cases.
- the air-tightness between the ladle and the casting machine and the walls of the chamber can be preferably achieved by means of suitable water-sealed, sand-sealed labyrinth seals, or the like.
- a facility for the continuous casting of steel is constituted by a casting ladle 1 containing liquid steel 2 produced, for example, by an electric-furnace.
- Liquid steel 4 flows by gravity through e gate valve 3 into a tundish, or distributor, 5, wherein steel is maintained at a constant level. From the tundish 5 steel flows, through one or more nozzles 6, into a same number of ingot moulds 7.
- the switch 8 of the liquid steel cast 4a which feeds each moulding line, performs also the function of tightly sealing the opening 7a of the ingot mould 7 in the presence of first-line leakages, and of preventing that, in case the casting is discontinued, from said opening the inert gas may escape, which is contained inside the chamber.
- the reference numeral 9 the portion of steel solidified inside the crystallizer, and by the reference numeral 10, the inner, still liquid, conical portion, of the bar, are indicated.
- the bar 11 When leaving the crystallizer 7, the bar 11 runs through cooling means (not depicted in the figure), which complete the solidifcation thereof.
- the bar (or the bars, in case with the tundish a plurality of crystallizers are associated) runs downwards with a speed controlled by the withdrawal rolls 16.
- the present invention provides an equipment, which is constituted by an air-tight chamber 14, which encloses all those areas of the facility, in which high-temperature, liquid steel is in contact with air, i.e., all the equipment pieces which are comprised between the bottom of the ladle 1 and the basis of the moulds 7.
- the air-tightness between the ladle 1 and the basis of the mould 7 and the walls of the chamber 14 is achieved by means of labyrinth sealing means 19.
- an atmosphere is maintained, which is constituted by nitrogen or carbon dioxide or argon, or by a mixture of said gases, or of similar gases, free from oxygen, under a slight over-pressure, which thus prevents steel of exposed steel surfaces 12, 13, and possibly 15, from being oxidized.
- a closed-loop conditioning system (not shown in figure) is furthermore associated, which is fitted with suitable sucking and circulation means, the function of which is of removing the heat, the fumes and vapours generated during the casting step.
- check and control means are associated, as well as sensors are provided (not depicted in the figure), such as to render fully automated the operation of the casting.
- said chamber is fitted with at least one flexible hose 17, or the like, which connects the external environment with the interior of the same chamber, and which allows the attending personnel to enter the same chamber, by using, e.g., a protection mask, or a tight suit, 18, connected with the external atmosphere, or with other ventilation means, so that the necessary and suitable switching and checking actions can be carried out.
- At least one wall of the chamber is made from a transparent material, and at least a further wall, or the entrance door, are made from a fast-breakage material, in order to allow any emergency interventions to be performed.
- the walls of said chamber 14 are made from a material particularly resistant to heat and to the possible drops of liquid steel.
- the use of the covering powders is eliminated, and the metal portion of the tundish, which is generally lined with a refractory material, is also prevented from being perforated, in case the refractory is broken or cracked; in fact, owing to the contact of high-temperature liquid steel - seeped through the refractory - with the metal wall of the tundish, this latter gets overheated, and would rapidly react with air oxygen - if present -, melting, and consequently causing liquid steel to escape.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20766/88A IT1218007B (it) | 1988-05-27 | 1988-05-27 | Procedimento per la formatura automatica di un tubo metallico continuo riempito con materiali in polvere,sua introduzione diretta nel metallo liquido e relativa apparecchiatura |
| DE8888112281T DE3868061D1 (de) | 1988-05-27 | 1988-07-29 | Verfahren und zweckdienliche einrichtung fuer die durchfuehrung von stahlstrangguss bei vollstaendiger abwesenheit von oxydierenden mitteln. |
| EP88112281A EP0352356B1 (fr) | 1988-05-27 | 1988-07-29 | Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants |
| BR898902402A BR8902402A (pt) | 1988-05-27 | 1989-05-26 | Processo para formacao continua e automatica de um tubo metalico continuo enchido com materiais em forma de po para o tratamento metalurgico de metais em fusao dentro da cacamba de corrida,e para carregar o mesmo no metal em fusao contido na cacamba |
| JP1135693A JPH0220641A (ja) | 1988-05-27 | 1989-05-29 | 金属チューブの形成及び注入方法及びその装置 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20766/88A IT1218007B (it) | 1988-05-27 | 1988-05-27 | Procedimento per la formatura automatica di un tubo metallico continuo riempito con materiali in polvere,sua introduzione diretta nel metallo liquido e relativa apparecchiatura |
| EP88112281A EP0352356B1 (fr) | 1988-05-27 | 1988-07-29 | Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0352356A1 true EP0352356A1 (fr) | 1990-01-31 |
| EP0352356B1 EP0352356B1 (fr) | 1992-01-22 |
Family
ID=39689257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88112281A Expired EP0352356B1 (fr) | 1988-05-27 | 1988-07-29 | Procédé et équipement relatif pour la mise en ouvre la coulée continue d'acier en absence complète d'agents oxydants |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0352356B1 (fr) |
| JP (1) | JPH0220641A (fr) |
| BR (1) | BR8902402A (fr) |
| DE (1) | DE3868061D1 (fr) |
| IT (1) | IT1218007B (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6602461B2 (en) | 2001-03-14 | 2003-08-05 | Km Europa Metal Ag | Arrangement for pouring a pourable melt made up of a copper alloy |
| JP2004074185A (ja) * | 2002-08-12 | 2004-03-11 | Ishikawajima Harima Heavy Ind Co Ltd | 双ロール鋳造機 |
| CN101658920A (zh) * | 2009-10-10 | 2010-03-03 | 山东泰山钢铁集团有限公司 | 一种防止碳钢精密铸件浇注时氧化的方法 |
| CN117206506A (zh) * | 2023-07-25 | 2023-12-12 | 新余华峰特钢有限公司 | 一种特钢模铸保护浇铸装置 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2607070A1 (de) * | 1975-02-25 | 1976-09-02 | Voest Ag | Verfahren und einrichtung zur behandlung von metallschmelzen waehrend des stranggiessens mit spuelgas |
| DE2839870A1 (de) | 1977-09-13 | 1979-03-22 | British Steel Corp | Verfahren und vorrichtung zum metallguss |
| EP0005820A1 (fr) | 1978-06-01 | 1979-12-12 | Concast Holding Ag | Procédé et dispositif pour la coulée continue des métaux selon une ou plusieurs lignes de coulée |
-
1988
- 1988-05-27 IT IT20766/88A patent/IT1218007B/it active
- 1988-07-29 DE DE8888112281T patent/DE3868061D1/de not_active Revoked
- 1988-07-29 EP EP88112281A patent/EP0352356B1/fr not_active Expired
-
1989
- 1989-05-26 BR BR898902402A patent/BR8902402A/pt unknown
- 1989-05-29 JP JP1135693A patent/JPH0220641A/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2607070A1 (de) * | 1975-02-25 | 1976-09-02 | Voest Ag | Verfahren und einrichtung zur behandlung von metallschmelzen waehrend des stranggiessens mit spuelgas |
| DE2839870A1 (de) | 1977-09-13 | 1979-03-22 | British Steel Corp | Verfahren und vorrichtung zum metallguss |
| EP0005820A1 (fr) | 1978-06-01 | 1979-12-12 | Concast Holding Ag | Procédé et dispositif pour la coulée continue des métaux selon une ou plusieurs lignes de coulée |
| EP0005820B1 (fr) * | 1978-06-01 | 1982-12-08 | Concast Holding Ag | Procédé et dispositif pour la coulée continue des métaux selon une ou plusieurs lignes de coulée |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6602461B2 (en) | 2001-03-14 | 2003-08-05 | Km Europa Metal Ag | Arrangement for pouring a pourable melt made up of a copper alloy |
| KR100864465B1 (ko) * | 2001-03-14 | 2008-10-22 | 카엠 오이로파 메탈 악티엔 게젤샤프트 | 구리 합금으로 구성된 주조 용탕의 출탕 장치 |
| JP2004074185A (ja) * | 2002-08-12 | 2004-03-11 | Ishikawajima Harima Heavy Ind Co Ltd | 双ロール鋳造機 |
| EP1690615A3 (fr) * | 2002-08-12 | 2006-08-23 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Installation de coulée continue entre cylindres |
| US7530384B2 (en) | 2002-08-12 | 2009-05-12 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Dual roll casting machine |
| CN101658920A (zh) * | 2009-10-10 | 2010-03-03 | 山东泰山钢铁集团有限公司 | 一种防止碳钢精密铸件浇注时氧化的方法 |
| CN117206506A (zh) * | 2023-07-25 | 2023-12-12 | 新余华峰特钢有限公司 | 一种特钢模铸保护浇铸装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8820766A0 (it) | 1988-05-27 |
| BR8902402A (pt) | 1990-01-16 |
| EP0352356B1 (fr) | 1992-01-22 |
| JPH0220641A (ja) | 1990-01-24 |
| DE3868061D1 (de) | 1992-03-05 |
| IT1218007B (it) | 1990-03-30 |
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