EP0325242A3 - Method for refining molten steel in a vacuum - Google Patents

Method for refining molten steel in a vacuum Download PDF

Info

Publication number
EP0325242A3
EP0325242A3 EP89100866A EP89100866A EP0325242A3 EP 0325242 A3 EP0325242 A3 EP 0325242A3 EP 89100866 A EP89100866 A EP 89100866A EP 89100866 A EP89100866 A EP 89100866A EP 0325242 A3 EP0325242 A3 EP 0325242A3
Authority
EP
European Patent Office
Prior art keywords
molten steel
ladle
vacuum vessel
gas
vacuum
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Withdrawn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
EP89100866A
Other languages
German (de)
French (fr)
Other versions
EP0325242A2 (en
Inventor
Toshio C/O Nkk Corporation Ishii
Yutaka c/o NKK Corporation Okubo
Shuzo c/o NKK Corporation Fukuda
Yoshihiko c/o NKK Corporation Kawai
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
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 NKK Corp filed Critical NKK Corp
Publication of EP0325242A2 publication Critical patent/EP0325242A2/en
Publication of EP0325242A3 publication Critical patent/EP0325242A3/en
Withdrawn legal-status Critical Current

Links

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

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)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

A method for refining molten steel in a vacuum comprises an immersion process, wherein two immersion nozzles (5) (6) arranged at the lower portion of a vacuum vessel (4) are immersed in molten steel (2) in a ladle (1); a dissolving process, wherein gases are dissolved in molten steel by blowing gases containing at least gas soluble in the molten steel from a gas blow-in opening (3) arranged in a ladle (1) in the molten steel; a first degassing process, wherein the molten steel is degassed by keeping the the vacuum vessel evacuated, having the molten steel circulated between the ladle and the vacuum vessel by injecting gases containing at least an inert gas from the middle (7) of the rising tube (5) and blowing gases containing at least gas soluble in the molten steel from a gas blow-in opening (3) arranged in the ladle (1); and a second degassing process, wherein the molten steel is degassed by keeping the vacuum vessel evacuated, stopping a gas blow-in from the gas blow-in opening (3) arranged in the ladle (1) and having the molten steel circulated between the ladle and the vacuum vessel by injecting gases containing at least an inert gas from the middle (7) of the rising tube (5) in the molten steel (1).
EP89100866A 1988-01-21 1989-01-19 Method for refining molten steel in a vacuum Withdrawn EP0325242A3 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP9675/88 1988-01-21
JP63009675A JPH01188619A (en) 1988-01-21 1988-01-21 Method for rh vacuum degasification
JP1031105A JPH02211974A (en) 1988-01-21 1989-02-13 Method for purifying molten metal by reduction of pressure

Publications (2)

Publication Number Publication Date
EP0325242A2 EP0325242A2 (en) 1989-07-26
EP0325242A3 true EP0325242A3 (en) 1990-02-14

Family

ID=39689269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100866A Withdrawn EP0325242A3 (en) 1988-01-21 1989-01-19 Method for refining molten steel in a vacuum

Country Status (6)

Country Link
EP (1) EP0325242A3 (en)
JP (2) JPH01188619A (en)
KR (1) KR930005067B1 (en)
AU (1) AU601893B2 (en)
BR (1) BR8900249A (en)
CA (1) CA1338397C (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5077255A (en) * 1986-09-09 1991-12-31 Exxon Chemical Patents Inc. New supported polymerization catalyst
US5221326A (en) * 1990-05-17 1993-06-22 Kawasaki Steel Corporation Method of producing ultra-low-carbon steel
DE19856073A1 (en) * 1998-12-04 2000-06-15 Technometal Ges Fuer Metalltec Process for denitrifying molten steel
US7396378B2 (en) * 2000-06-05 2008-07-08 Sanyo Special Steel Co., Ltd. Process for producing a high cleanliness steel
GB2406580B (en) * 2000-06-05 2005-09-07 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
GB2410253B (en) * 2000-06-05 2005-09-14 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
EP1568790A1 (en) * 2004-02-24 2005-08-31 Paul Wurth S.A. Apparatus for the treatment of liquid metal in a ladle
CN102296159B (en) * 2010-06-25 2013-05-01 鞍钢股份有限公司 Handling method for blockage of insertion tube
KR101881971B1 (en) * 2016-11-09 2018-08-24 주식회사 포스코 Casting apparatus and casging method using the same
CN113957203B (en) * 2021-12-21 2022-03-15 太原科技大学 Multifunctional non-centrosymmetric vacuum refining equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB954214A (en) * 1959-08-14 1964-04-02 Heraeus Gmbh W C Improvements in or relating to the vacuum degassing of metals
DE1222090B (en) * 1960-09-09 1966-08-04 Heraeus Gmbh W C Process for degassing molten steel
US3320053A (en) * 1964-09-25 1967-05-16 Bethlehem Steel Corp Method of injecting gases into steel melts

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6021207B2 (en) * 1981-05-26 1985-05-25 川崎製鉄株式会社 Manufacturing method of ultra-low carbon molten steel
JPS57200514A (en) * 1981-06-03 1982-12-08 Nippon Kokan Kk <Nkk> Method for degassing molten steel
JPS5837112A (en) * 1981-08-29 1983-03-04 Kawasaki Steel Corp Vacuum refining method of molten steel
JPS60184619A (en) * 1984-02-29 1985-09-20 Sumitomo Metal Ind Ltd Production of low-nitrogen steel
AU601602B2 (en) * 1987-06-29 1990-09-13 Kawasaki Steel Corporation Method and apparatus for degassing molten metal utilizing RH method
AU605949B2 (en) * 1987-12-25 1991-01-24 Nkk Corporation Method for cleaning molten metal and apparatus therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB954214A (en) * 1959-08-14 1964-04-02 Heraeus Gmbh W C Improvements in or relating to the vacuum degassing of metals
DE1222090B (en) * 1960-09-09 1966-08-04 Heraeus Gmbh W C Process for degassing molten steel
US3320053A (en) * 1964-09-25 1967-05-16 Bethlehem Steel Corp Method of injecting gases into steel melts

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no.31 (C-327)[2088], 06 February 1986# *
PATENT ABSTRACTS OF JAPAN, vol. 10, no.31 (C-327)[2088], 6th February 1986; & JP-A-60 184 619 (SUMITOMO KINZOKU KOGYO K.K.) 20-09-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 118 (C-167)[1263], 21st May 1983; & JP-A-58 37 112 (KAWASAKI SEITETSU K.K.) 04-03-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 43 (C-152)[1188], 19th February 1983; & JP-A-57 194 206 (KAWASAKI SEITETSU K.K.) 29-11-1982 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 53 (C-154)[1198], 03 March 1983# *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 53 (C-154)[1198], 3rd March 1983; & JP-A-57 200 514 (NIPPON KOKAN K.K.) 08-12-1982 *

Also Published As

Publication number Publication date
CA1338397C (en) 1996-06-18
JPH01188619A (en) 1989-07-27
JPH02211974A (en) 1990-08-23
AU601893B2 (en) 1990-09-20
BR8900249A (en) 1989-09-19
EP0325242A2 (en) 1989-07-26
KR890012009A (en) 1989-08-23
AU2848289A (en) 1989-08-10
KR930005067B1 (en) 1993-06-15

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