EP0126560A2 - Tuyère de coulée et procédé de coulée utilisant celle-ci - Google Patents
Tuyère de coulée et procédé de coulée utilisant celle-ci Download PDFInfo
- Publication number
- EP0126560A2 EP0126560A2 EP84302838A EP84302838A EP0126560A2 EP 0126560 A2 EP0126560 A2 EP 0126560A2 EP 84302838 A EP84302838 A EP 84302838A EP 84302838 A EP84302838 A EP 84302838A EP 0126560 A2 EP0126560 A2 EP 0126560A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- casting
- carbon
- composition
- weight
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
Definitions
- the present invention relates to a nozzle for casting ultra low carbon steel.
- an ultra low carbon steel has been proposed which contains less than 15 ppm carbon.
- a need has arisen for a casting nozzle suitable for casting ultra low carbon steels by the continuous casting process.
- alumina-graphite nozzles which are used for casting conventional, carbon-containing steels, are used for casting ultra-low carbon steels. carbon pickup becomes apparent either as the nozzle is worn away by the molten steel or through decarburization of the nozzle itself.
- conventional alumina-graphite nozzles are not suitable for use with ultra low carbon steels.
- Fused silica nozzles do not contain carbon. However, these nozzles are susceptible to wear, especially by high manganese steel.
- a casting nozzle formed of a material comprising 70 to 98 weight % of a refractory material other than carbon or graphite, and 2 to 30 weight % of boron nitride.
- the refractory material is selected from sintered or electrically fused magnesium, non-stabilized or semi-stabilized zirconia, alpha-alumina, beta-alumina, mullite, sillimanite, clay materials, fused silica, Si 3 N 4 , B 4 C and SiC.
- an inorganic bonding agent is mixed with the composition, e.g in an amount of from 5 to 20 weight % of the composition.
- an inorganic bonding agent e.g. clay (e.g. bentonite), waterglass, aluminium phosphate etc.
- the nozzle of the present invention is made by moulding the present composition followed by sintering in a reducing atmosphere.
- boron nitride If more than 30% boron nitride is used, then the nozzle is easily oxidized to B 2 0 3 and wear of the nozzle is increased. If less than 2% boron nitride is used, the desirable characteristics of boron nitride, i.e. chemical inertness and high thermal conductivity are not shown and thermal shock spalling is increased.
- compositions and bonding agents mentioned above are added with an appropriate amount of water and kneaded in a kneader for 40 minutes.
- the mixtures are dried in a drying furnace at 80°C for 12 hours so that the residual water content goes down to 1% to 3%, and thereafter crushed by a crusher to particles smaller than lmm.
- Rubber molds are filled with the thus prepared materials and molded under a molding pressure of 1,000 kg/cm 2 in order to form immersion nozzles of predetermined shapes.
- the molding products are then sintered in a tunnel furnace whose ceiling temperature is 1250°C, and manufactured into predetermined shapes.
- An immersion nozzle according to Composition 1 was compared with the conventional nozzle of Composition A When using each nozzle four times with a 250 short ton (227 tonne) ladle for 240 minutes, the wear of the present nozzle was 0.021 mm/minute while the wear of the conventional nozzle A was 0.022 mm/minute. As for the pickup of carbon, the present nozzle showed no carbon pick up while the conventional nozzle showed a carbon pick up of 11 ppm by wt.
- An immersion nozzle according to Composition 2 was compared with the conventinal nozzle of composition B.
- the wear of the present nozzle was 0.015 mm/minute while the wear of the conventional nozzle be was 0.020 mm/minute.
- the pickup of carbon the present nozzle had a carbon pick up of only 1 ppm by wt while the conventional nozzle B had a carbon pickup of 10 ppm by wt.
- a long nozzle according to the Composition 3 was used between a ladle and a tundish six times with a 280 short ton (254 tonne) ladle for 300 minutes.
- the wear was 0.023 mm/minute and there was no carbon pickup.
- An immersion nozzle according to Composition 4 was compared with the conventional nozzle of compositon A.
- the wear of the nozzle of Composition 4 was 0.023 mm/minute and the wear of the conventional nozzle of Composition A was 0.022 mm.minute.
- the pickup of carbon the nozzle of Composition 4 showed no carbon pickup while the conventional nozzle of Composition A had a carbon pickup of 11 ppm by wt.
- An immersion nozzle according to Composition 5 was compared with the Comparative Example.
- the wear of the nozzle of the Comparative Example was so substantial that the nozzle broke off for the third time while the nozzle of Composition 5 was capable of casting five times for 250 minutes.
- the wear thereof was 0.020 mm/minute and the carbon pickup was 2 ppm by wt.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Continuous Casting (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58089880A JPS59232959A (ja) | 1983-05-19 | 1983-05-19 | 極低炭素鋼用鋳造用ノズル |
JP89880/83 | 1983-05-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0126560A2 true EP0126560A2 (fr) | 1984-11-28 |
EP0126560A3 EP0126560A3 (fr) | 1986-03-05 |
Family
ID=13983078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84302838A Withdrawn EP0126560A3 (fr) | 1983-05-19 | 1984-04-27 | Tuyère de coulée et procédé de coulée utilisant celle-ci |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0126560A3 (fr) |
JP (1) | JPS59232959A (fr) |
KR (1) | KR840009231A (fr) |
AU (1) | AU2787584A (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0256217A2 (fr) * | 1986-08-12 | 1988-02-24 | Didier-Werke Ag | Busette de coulée immergée et son procédé de fabrication |
EP0588218A1 (fr) * | 1992-09-18 | 1994-03-23 | Akechi Ceramics Co. Ltd. | Buse de coulée de l'acier fondu |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3915900A (en) * | 1972-08-18 | 1975-10-28 | Kempten Elektroschmelz Gmbh | Evaporator made from sintered refractory material |
US4007049A (en) * | 1968-08-06 | 1977-02-08 | The United States Of America As Represented By The Secretary Of The Air Force | Thermal shock resistant ceramic composite |
SU833868A1 (ru) * | 1979-09-26 | 1981-05-30 | Ордена Трудового Красного Знамениинститут Проблем Материаловедения Ah Усср | Шихта дл изготовлени огнеупорногоМАТЕРиАлА |
SU920049A1 (ru) * | 1980-06-16 | 1982-04-15 | Ордена Трудового Красного Знамени Институт Проблем Материаловедения Ан Усср | Шихта дл изготовлени огнеупорного материала |
SU979301A1 (ru) * | 1981-07-06 | 1982-12-07 | Ордена Трудового Красного Знамени Институт Проблем Материаловедения Ан Усср | Шихта дл изготовлени огнеупорного материала |
-
1983
- 1983-05-19 JP JP58089880A patent/JPS59232959A/ja active Pending
-
1984
- 1984-03-28 KR KR1019840001617A patent/KR840009231A/ko not_active IP Right Cessation
- 1984-04-27 EP EP84302838A patent/EP0126560A3/fr not_active Withdrawn
- 1984-05-10 AU AU27875/84A patent/AU2787584A/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4007049A (en) * | 1968-08-06 | 1977-02-08 | The United States Of America As Represented By The Secretary Of The Air Force | Thermal shock resistant ceramic composite |
US3915900A (en) * | 1972-08-18 | 1975-10-28 | Kempten Elektroschmelz Gmbh | Evaporator made from sintered refractory material |
SU833868A1 (ru) * | 1979-09-26 | 1981-05-30 | Ордена Трудового Красного Знамениинститут Проблем Материаловедения Ah Усср | Шихта дл изготовлени огнеупорногоМАТЕРиАлА |
SU920049A1 (ru) * | 1980-06-16 | 1982-04-15 | Ордена Трудового Красного Знамени Институт Проблем Материаловедения Ан Усср | Шихта дл изготовлени огнеупорного материала |
SU979301A1 (ru) * | 1981-07-06 | 1982-12-07 | Ордена Трудового Красного Знамени Институт Проблем Материаловедения Ан Усср | Шихта дл изготовлени огнеупорного материала |
Non-Patent Citations (3)
Title |
---|
SOVIET INVENTIONS ILLUSTRATED, Section Chemical, Week E 13, 12th May 1982, abstract no. 25707 L/02, Derwent Publications Ltd., London, GB; & SU-A-833 868 (AS UKR MAT) 30-05-1981 * |
SOVIET INVENTIONS ILLUSTRATED, Section Chemical, Week K 07, 30th March 1983, abstract no. 17092 L/02, Derwent Publications Ltd., London, GB; & SU-A-920 049 (AS UKR MAT) 15-04-1982 * |
SOVIET INVENTIONS ILLUSTRATED, Section Chemical, Week K 40, 16th November 1983, abstract no. 83-781 647 L/02, Derwent Publications Ltd., London, GB; & SU-A-979 301 (AS UKR MAT) 07-12-1982 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0256217A2 (fr) * | 1986-08-12 | 1988-02-24 | Didier-Werke Ag | Busette de coulée immergée et son procédé de fabrication |
EP0256217A3 (fr) * | 1986-08-12 | 1988-11-30 | Didier-Werke Ag | Busette de coulée immergée et son procédé de fabrication |
EP0588218A1 (fr) * | 1992-09-18 | 1994-03-23 | Akechi Ceramics Co. Ltd. | Buse de coulée de l'acier fondu |
US5348203A (en) * | 1992-09-18 | 1994-09-20 | Akechi Ceramics Co., Ltd. | Molten steel pouring nozzle |
Also Published As
Publication number | Publication date |
---|---|
JPS59232959A (ja) | 1984-12-27 |
AU2787584A (en) | 1984-11-22 |
EP0126560A3 (fr) | 1986-03-05 |
KR840009231A (ko) | 1984-12-26 |
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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 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): DE FR GB |
|
17P | Request for examination filed |
Effective date: 19860828 |
|
17Q | First examination report despatched |
Effective date: 19861216 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19870224 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KONDO, MASANAO Inventor name: SUZUKI, HIRONOBU |