US3754892A - Continuous method of steel making - Google Patents

Continuous method of steel making Download PDF

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Publication number
US3754892A
US3754892A US00821385A US3754892DA US3754892A US 3754892 A US3754892 A US 3754892A US 00821385 A US00821385 A US 00821385A US 3754892D A US3754892D A US 3754892DA US 3754892 A US3754892 A US 3754892A
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United States
Prior art keywords
furnace
slag
steel
oxygen
steel making
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.)
Expired - Lifetime
Application number
US00821385A
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English (en)
Inventor
R Ando
T Fukushima
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
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Nippon Kokan Ltd
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Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3754892A publication Critical patent/US3754892A/en
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    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/567—Manufacture of steel by other methods operating in a continuous way
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/957—Continuous refining of molten iron

Definitions

  • a process for manufacturing steel continuously wherein sulphur and phosphorous are removed from molten iron or molten iron alloy prior to effecting substantial decarburization thereof. Slag and molten iron or molten iron alloy are agitated mechanically proximate their interface and oxygen is passed simultaneously onto their interface. Thereafter, oxygen is injected into the molten iron or molten iron alloy to effect substantial decarburization.
  • desulphurization can be accomplished independently by contacting the molten iron or molten iron alloy with a slag forming agent, in the absence of oxygen preferablyjwith the indicated mechanical agitation.
  • the treated iron or iron alloy and slag can then be processed as stated above.
  • the FIGURE is a schematic flow diagram illustrating an embodiment wherein desulphurization, dephosphorization and decarburizing are shown.
  • Calcium carbide (2 kg/min) a slag making agent is passed into tank 3 through feeder 4.
  • Desulphurizing of the pig iron is effected while eccentrically agitating continuously the materials in the area near the slag-metal interface by means of agitating rods 5 made of carbonaceous materials and other refractory materials such as refractory clay of high alumina composition (three rods are fitted). Further details of such an agitation operation are provided in copending application Ser. No. 818,283, filed on Apr. 22, 1969.
  • Slag can be removed from tank 3 via slag-removing line 17, and can be recycled (not shown) to tank 3 if desired.
  • the pig iron thus treated is passed from tank 3 through outlet line 21 to a tank 6 (capacity 10 tons) for dephosphorizing treatment.
  • Slag producing agent a kg/min. of calcined lime, 30 kg/min. of mill scale, 30 kg/min. of soda ash (Na,CO,), l0 kg/min. of fluorite, CaF, or 20 kg/pig ton, l0 kg/per pig ton of mill scale, 3 kg/pig ton of fluorite, CaF,) is passed through feeder 9 and charge line 22 to tank 6, and at the same time oxygen is injected into tank 6 for a total amount of 30 Nmlmin.
  • oxygen lances 10 three lances are equipped
  • tank 6 while agitating by means of an interface agitating device having agitating rods 5 made of carbonaceous materials and other refractory materials as in the case of said tank 3 so as to remove phosphorus by oxidation.
  • the pressure of the oxygen then injected is from about 2kg/cm to about 3kg/cm In this case slag is removed from slag-removing line 17, and can be recycled (not shown) to tank 6 when necessary.
  • the treated pig iron is then passed from tank 6 through line 11 to steel making furnace 13 (three units) of pure-oxygen, top-blown converter type provided on turret-type, rotating table 12, and the decarburizing refining is effected by conventional processing in which oxygen is injected through lance M.
  • the slag is also removed from tank 6 through line 11.
  • blank steel of medium carbon content containing 0.25% of C, 0.006% of S, 0.008% of I, a trace of Si, and a trace of Mn, is obtained.
  • a ferro alloy as a deoxidizing agent at the final step of steel making, the desired steel product is obtained.
  • the three units of decarburizing steel making furnaces provided on said turret-type rotating table 12 are adapted to cooperate effectively, each operating alternatingly as a decarburizing furnace 13a during receiving pig iron, a furnace 13b during blowing refining, and furnace (not shown) during topping and scrapping.
  • the desulphurization and the dephosphorization are effected using separate treating tanks, 3 and 6, respectively.
  • another steel making furnace can be used for preheating the scraps, or utilizing it as a ladle for molten steel, or using it as a receiving tank of pig iron which has been subjected to the first processing; thus they have a wide range of utility.
  • the continuous steel making furnace according to the present invention is characterized by the fact that the desulphurization and dephosphorization process, and that, in said desulfurization and dephosphorization process, the mechanical agitation is effected at the interface of slag and metal.
  • the principal object thereof is the decarburization
  • the steel obtained is a simple blank steel having a low carbon content which requires one further step to finish it into a desired kind of steel.
  • low sulphur and low phosphorus steel can be obtained easily, control of each of these components can be effected readily following the fected at a relatively low temperature, and although the temperature rises so much at the final stage of the decarburization, almost no slag is produced in this stage, so that wear loss due to melting of refractory material in the desulphurizing and dephosphorizing tank is reduced remarkably.
  • resulphurization and re-phosphorization in the decarburization process can be prevented because substantially complete removal of slag is effected in the desulphurization and dephosphorization processing stage or stages.
  • a continuous process for manufacturing steel comprising the sequential steps of a. continuously charging to a refining vessel molten iron or molten iron alloy containing sulphur, phosphorus and carbon,
  • the slag forming agent of (c) comprises a mixture of calcined line, mill scale, soda ash and CaF 5.
  • the furnace in (c) is a top-blown oxygen converter furnace.
  • step (c) is from about 2 kg/cm to about 3 kg/cm.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US00821385A 1968-05-09 1969-05-02 Continuous method of steel making Expired - Lifetime US3754892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3056368 1968-05-09

Publications (1)

Publication Number Publication Date
US3754892A true US3754892A (en) 1973-08-28

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ID=12307269

Family Applications (1)

Application Number Title Priority Date Filing Date
US00821385A Expired - Lifetime US3754892A (en) 1968-05-09 1969-05-02 Continuous method of steel making

Country Status (7)

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US (1) US3754892A (xx)
AT (1) AT308792B (xx)
BE (1) BE732833A (xx)
DE (1) DE1923596C3 (xx)
FR (1) FR2009870A1 (xx)
GB (1) GB1234878A (xx)
NL (1) NL152602B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472195A (en) * 1983-08-15 1984-09-18 Olin Corporation Process for decarburizing alloy melts
US4515630A (en) * 1983-08-15 1985-05-07 Olin Corporation Process of continuously treating an alloy melt
US4564390A (en) * 1984-12-21 1986-01-14 Olin Corporation Decarburizing a metal or metal alloy melt
US4696458A (en) * 1986-01-15 1987-09-29 Blaw Knox Corporation Method and plant for fully continuous production of steel strip from ore
US4932635A (en) * 1988-07-11 1990-06-12 Axel Johnson Metals, Inc. Cold hearth refining apparatus
US5417739A (en) * 1993-12-30 1995-05-23 Ltv Steel Company, Inc. Method of making high nitrogen content steel
US5830259A (en) * 1996-06-25 1998-11-03 Ltv Steel Company, Inc. Preventing skull accumulation on a steelmaking lance
US5865876A (en) * 1995-06-07 1999-02-02 Ltv Steel Company, Inc. Multipurpose lance
US5885323A (en) * 1997-04-25 1999-03-23 Ltv Steel Company, Inc. Foamy slag process using multi-circuit lance

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE755733A (fr) * 1969-09-06 1971-02-15 Rheinstahl Huettenwerke Ag Procede et dispositif de desulfuration de fonte brute
FR2297914A1 (fr) * 1975-01-20 1976-08-13 Siderurgie Fse Inst Rech Procede de desulfuration de la fonte par voie gazeuse
DE102012011123A1 (de) * 2012-06-05 2013-12-05 SAXONIA Holding GmbH Verfahren zur Verwertung von Feuerlöschpulver der Brandklasse BC

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1122831A (fr) * 1955-02-11 1956-09-13 Huetten Und Stahlverfahren M B Procédé et installation pour l'élaboration en continu de l'acier à partir de fonte brute

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4472195A (en) * 1983-08-15 1984-09-18 Olin Corporation Process for decarburizing alloy melts
US4515630A (en) * 1983-08-15 1985-05-07 Olin Corporation Process of continuously treating an alloy melt
US4564390A (en) * 1984-12-21 1986-01-14 Olin Corporation Decarburizing a metal or metal alloy melt
US4696458A (en) * 1986-01-15 1987-09-29 Blaw Knox Corporation Method and plant for fully continuous production of steel strip from ore
US4932635A (en) * 1988-07-11 1990-06-12 Axel Johnson Metals, Inc. Cold hearth refining apparatus
US5417739A (en) * 1993-12-30 1995-05-23 Ltv Steel Company, Inc. Method of making high nitrogen content steel
US5865876A (en) * 1995-06-07 1999-02-02 Ltv Steel Company, Inc. Multipurpose lance
US5830259A (en) * 1996-06-25 1998-11-03 Ltv Steel Company, Inc. Preventing skull accumulation on a steelmaking lance
US5885323A (en) * 1997-04-25 1999-03-23 Ltv Steel Company, Inc. Foamy slag process using multi-circuit lance

Also Published As

Publication number Publication date
GB1234878A (en) 1971-06-09
DE1923596B2 (xx) 1975-04-03
FR2009870A1 (fr) 1970-02-13
AT308792B (de) 1973-07-25
BE732833A (xx) 1969-10-16
NL6906392A (xx) 1969-11-11
DE1923596A1 (de) 1970-01-29
DE1923596C3 (de) 1975-11-20
NL152602B (nl) 1977-03-15

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