US20040108634A1 - Vacuum chamber notably for steel decarburisation - Google Patents

Vacuum chamber notably for steel decarburisation Download PDF

Info

Publication number
US20040108634A1
US20040108634A1 US10/472,400 US47240003A US2004108634A1 US 20040108634 A1 US20040108634 A1 US 20040108634A1 US 47240003 A US47240003 A US 47240003A US 2004108634 A1 US2004108634 A1 US 2004108634A1
Authority
US
United States
Prior art keywords
tank
steel
snorkel
snorkels
jambs
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.)
Abandoned
Application number
US10/472,400
Other languages
English (en)
Inventor
Jean-Claude Lecas
Pascal Capelli
Paul Hayez
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.)
USINOR SA
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to USINOR reassignment USINOR ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CAPELLI, PASCAL, HAYEZ, PAUL, LECAS, JEAN-CLAUDE
Publication of US20040108634A1 publication Critical patent/US20040108634A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising

Definitions

  • the present invention relates to a vacuum treatment tank, especially for decarburization of steel.
  • Such a tank serves to carry out decarburization or dehydrogenization treatments and also light treatments consisting in melting a steel in which the ranges of the various additives are reduced to such a point that it is not possible to obtain them directly in the converter.
  • a vacuum treatment tank generally consists of two parts:
  • a lower part called the lower tank, having two jambs that are provided with two snorkels intended to be immersed in the steel of the ladle containing the steel to be treated.
  • a quantity of gas especially argon, is injected by means of injection nozzles located internally and around the periphery of one of the snorkels, called the ascending snorkel, allowing constant circulation of the steel in the lower tank, the return of the steel into the ladle taking place via the other snorkel called the descending snorkel.
  • the snorkels are joined to the jambs of the tank by means of flanges that include a seal and allow said snorkels to be easily mounted and demounted, repaired or changed.
  • the refractory internal parts of the snorkels and of the jamb of the tank are produced by refractory bricks, with a straight seal in the plane of the flange linking jambs and snorkels.
  • the straight seal is considered as a very weak part in terms of mechanical and chemical resistance. Erosion, that occurs at this point on the tank, is facilitated by a steel recirculation rate of around 115 metric tons/min for 25 min in the case of low-carbon steels.
  • the circulation is the result of an injected argon gas displacement of around 300 m/s with a flow rate of around 140 Sm 3 /h.
  • tanks are produced in which the snorkels are fastened to the tank, the flange having been omitted.
  • the metal shell of the snorkels is then welded directly to the tank.
  • This type of tank that does not allow easy snorkel interchangeability, makes it very difficult to repair the brickwork of the lower tank and results in time wastage and a high cost in using the tank.
  • the object of the present invention is to reduce the substantial amount of wear that occurs at the jointing face between jamb and snorkel in a tank having a connection flange between jamb and snorkel.
  • the subject of the invention is a vacuum treatment tank, especially for decarburization of steel, comprising:
  • an upper part called the upper tank, having the shape of a vacuum bell;
  • a lower part comprising two jambs that are provided with two snorkels, namely an ascending snorkel and a descending snorkel that are intended to be immersed in the steel of a ladle containing the steel to be treated, the snorkels being joined to the jambs of the lower tank by means of flanges via a jointing face supporting a seal, the flanges allowing the snorkels to be mounted and demounted.
  • the tank is characterized in that the jointing face comprises at least two parallel planes.
  • the jointing face forms at least one shoulder, ensuring fitting of the mortise-and-tenon type between the jamb and the snorkel;
  • the tenon is produced on the jointing face of the snorkel.
  • the tenon is bricked, fitting into the mortise of the jamb, the mortise also being bricked.
  • FIG. 1 shows, in cross section, a tank prior to the invention.
  • FIGS. 2A and 2B show, in cross section, a front view and a side view of a tank according to the invention.
  • FIG. 3 is a cross-sectional view of the detail of the jointing face according to the invention.
  • the invention presented relates, as shown in FIG. 1, to a vacuum treatment tank 1 , especially for the decarburization of steel, comprising:
  • an upper part called the upper tank 2 , having the shape of a vacuum bell, and intended to create a vacuum above the bath of treated steel, circulating in the tank 1 .
  • the tank 1 may include an intermediate ring for protecting the upper tank from wear;
  • a lower part called the lower tank 3 into which is brought, by lifting, the steel to be treated, the lower part having two jambs 4 , 5 .
  • the lower tank 3 is provided with two snorkels 7 , 8 , namely an ascending snorkel 7 and a descending snorkel 8 , these being joined to the jambs 4 , 5 respectively and designed to be immersed in the steel of the ladle (not shown) containing the steel to be treated.
  • the snorkels 7 , 8 are joined to the jambs 4 , 5 of the tank 3 by means of a flange 10 , on a jointing face 11 supporting a seal.
  • the flanges 10 allow the snorkels 7 , 8 to be mounted and demounted.
  • the jointing face 11 comprises at least two parallel planes 12 and 13 .
  • the jointing face 11 forms at least one shoulder 14 , ensuring a fitting of the mortise-and-tenon type between the jambs 4 , 5 and the snorkels 7 , 8 .
  • the tenon projects from the jointing face of the snorkel and may include a gently-sloped bevel.
  • the tank according to the invention is lined with an internal refractory of the brickwork type and the tenon of the snorkel is also bricked, fitting into the mortise of the jamb, the mortise also being bricked.
  • the snorkel is composed of a metal shell 15 that is bricked up with the refractory bricks of the internal lining.
  • the bricks are bonded together and to the shell by means of a cement 16 .
  • the metal shell 15 is covered with reinforced concrete 17 produced by casting, in a casting mould that defines the external dimensions of the snorkel, and by inserting, into the volume, the nozzles that are intended for injecting a circulation gas, said nozzles opening around the periphery into the lower part of the snorkel.
  • These nozzles inject, for example, argon in order to generate bubbling in the liquid steel, within the space of the snorkel and the space of the jamb in order to modify the density of the steel and generate the movement as depicted in the figures by arrows indicating the circulation of the steel from the ladle into the ascending snorkel 7 .
  • the treated steel is then returned to the ladle via the descending snorkel 8 , as indicated by the arrow.
  • the snorkels are subject to considerable wear, especially in their lower end part, which part is in contact with the steel of the ladle.
  • the level of wear is indicated by the hatched part of FIGS. 2A and 2B and shows wear comparable to that occurring in a monolithic tank technique.
  • This improvement allows one to anticipate possible integrity over 150 treatments, the wear of the refractory no longer being in principle a point of limitation.
  • the improvement in terms of integrity is 30%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
US10/472,400 2001-03-27 2002-03-21 Vacuum chamber notably for steel decarburisation Abandoned US20040108634A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0104073 2001-03-27
FR0104073A FR2822849B1 (fr) 2001-03-27 2001-03-27 Enceinte de traitement sous vide notamment de decarburation d'acier
PCT/FR2002/000987 WO2002077298A2 (fr) 2001-03-27 2002-03-21 Enceinte de traitement sous vide notamment de decarburation d'acier

Publications (1)

Publication Number Publication Date
US20040108634A1 true US20040108634A1 (en) 2004-06-10

Family

ID=8861562

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/472,400 Abandoned US20040108634A1 (en) 2001-03-27 2002-03-21 Vacuum chamber notably for steel decarburisation

Country Status (12)

Country Link
US (1) US20040108634A1 (de)
EP (1) EP1373584B1 (de)
JP (1) JP2004529267A (de)
KR (1) KR20030083754A (de)
CN (1) CN1524129A (de)
AT (1) ATE286988T1 (de)
AU (1) AU2002308021A1 (de)
CA (1) CA2442006A1 (de)
DE (1) DE60202597T2 (de)
ES (1) ES2239243T3 (de)
FR (1) FR2822849B1 (de)
WO (1) WO2002077298A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090169609A1 (en) * 2005-11-08 2009-07-02 Helmholtz-Zentrum Fur Infektionsforschung Gmgb Pqs and its conjugates as adjuvants and their uses in pharmaceutical compositions
JP2017088982A (ja) * 2015-11-16 2017-05-25 Ｊｆｅスチール株式会社 真空脱ガス装置の環流管

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101748246B (zh) * 2008-12-15 2012-02-01 鞍钢股份有限公司 提高真空循环脱气炉插入管寿命的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131245A (en) * 1958-03-13 1964-04-28 Heraeus Gmbh W C Immersion pipe for vacuum degassing apparatus
US3203688A (en) * 1961-05-16 1965-08-31 Mc Graw Edison Co Apparatus for degassing molten metal
US3429565A (en) * 1966-12-23 1969-02-25 Harbison Walker Refractories Metallurgical degasser vessels
US3534949A (en) * 1966-09-15 1970-10-20 Oesterr Amerikan Magnesit Steel degassing vessels
US5024421A (en) * 1990-05-08 1991-06-18 Usx Corporation Interlocking snorkel refractory
US5853658A (en) * 1994-07-26 1998-12-29 Veitsch-Radex Aktiengesellschaft Fur Feuerfeste Erzeugnisse Gas purging device in the blowpipe of a degassing vessel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103950B (de) * 1956-02-21 1961-04-06 Hoerder Huettenunion Ag Einrichtung zum fortlaufenden Entgasen von Metall-, insbesondere Stahlschmelzen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131245A (en) * 1958-03-13 1964-04-28 Heraeus Gmbh W C Immersion pipe for vacuum degassing apparatus
US3203688A (en) * 1961-05-16 1965-08-31 Mc Graw Edison Co Apparatus for degassing molten metal
US3534949A (en) * 1966-09-15 1970-10-20 Oesterr Amerikan Magnesit Steel degassing vessels
US3429565A (en) * 1966-12-23 1969-02-25 Harbison Walker Refractories Metallurgical degasser vessels
US5024421A (en) * 1990-05-08 1991-06-18 Usx Corporation Interlocking snorkel refractory
US5853658A (en) * 1994-07-26 1998-12-29 Veitsch-Radex Aktiengesellschaft Fur Feuerfeste Erzeugnisse Gas purging device in the blowpipe of a degassing vessel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090169609A1 (en) * 2005-11-08 2009-07-02 Helmholtz-Zentrum Fur Infektionsforschung Gmgb Pqs and its conjugates as adjuvants and their uses in pharmaceutical compositions
US8257734B2 (en) 2005-11-08 2012-09-04 Helmhotlz-Zentrum Fuer Infektions-Forschung GmbH PQS and its conjugates as adjuvants and their uses in pharmaceutical compositions
JP2017088982A (ja) * 2015-11-16 2017-05-25 Ｊｆｅスチール株式会社 真空脱ガス装置の環流管

Also Published As

Publication number Publication date
EP1373584A2 (de) 2004-01-02
JP2004529267A (ja) 2004-09-24
AU2002308021A1 (en) 2002-10-08
KR20030083754A (ko) 2003-10-30
WO2002077298A3 (fr) 2003-04-10
FR2822849A1 (fr) 2002-10-04
DE60202597D1 (de) 2005-02-17
WO2002077298A2 (fr) 2002-10-03
CA2442006A1 (fr) 2002-10-03
CN1524129A (zh) 2004-08-25
ES2239243T3 (es) 2005-09-16
FR2822849B1 (fr) 2003-12-12
EP1373584B1 (de) 2005-01-12
ATE286988T1 (de) 2005-01-15
DE60202597T2 (de) 2005-06-16

Similar Documents

Publication Publication Date Title
SU1232149A3 (ru) Погружна капсула дл введени испар ющихс добавок в расплав чугуна или стали
CA2719933C (en) Burner/injector panel apparatus
US20040108634A1 (en) Vacuum chamber notably for steel decarburisation
CA2029680A1 (en) Jet flow device for injecting gas into molten metal
KR910002863B1 (ko) 산소가 상부를 통해서 주입되는 형태의 제강용 전로의 저부에 설치된 투과성 내화 요소의 수명을 증진시키는 방법
CN207498409U (zh) 一种rh精炼炉用浸渍管
RU2324744C1 (ru) Способ вакуумного рафинирования стали в ковше, устройство (варианты) и патрубок для его осуществления
JPH0225513A (ja) 環流式真空脱ガス装置の下部構造
CN2603718Y (zh) 中间包水口挡渣圈
JPS57171568A (en) Outflowing method for molten metal in ladle
CN219402294U (zh) 一种vod炉砖砌钢包结构
KR100952745B1 (ko) 대기조괴의 재산화물 생성방지용 차폐장치
CN213570574U (zh) 小吨位单嘴精炼炉的浸渍管和真空槽内衬结构
KR100436400B1 (ko) 고청정 주조품 제조를 위한 래들
Smirnov et al. Flotation of nonmetallic inclusions during argon injection into the tundish of a continuous-casting machine. Part 3
JPH0523808A (ja) 連続鋳造用ノズル
JP2601407Y2 (ja) 真空脱ガス槽の浸漬管構造
SU410103A1 (de)
SU1090729A1 (ru) Всасывающий патрубок циркул ционной вакуум-камеры
SU1254027A1 (ru) Устройство дл продувки газом жидкого металла
KR20110103150A (ko) 턴디쉬 구조체
KR101257273B1 (ko) 래들의 가스 주입구 세척용 치구 지지장치
RU25320U1 (ru) Фурма для продувки расплава металла кислородом
RU85482U1 (ru) Установка циркуляционного вакуумирования с окислением углерода
SU1588773A1 (ru) Установка дл модифицировани сплавов

Legal Events

Date Code Title Description
AS Assignment

Owner name: USINOR, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LECAS, JEAN-CLAUDE;CAPELLI, PASCAL;HAYEZ, PAUL;REEL/FRAME:014997/0618

Effective date: 20030909

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION