US3885957A - Method for the desulfurization of a steel melt - Google Patents

Method for the desulfurization of a steel melt Download PDF

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Publication number
US3885957A
US3885957A US333690A US33369073A US3885957A US 3885957 A US3885957 A US 3885957A US 333690 A US333690 A US 333690A US 33369073 A US33369073 A US 33369073A US 3885957 A US3885957 A US 3885957A
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United States
Prior art keywords
percent
calcium
weight
melt
method defined
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Expired - Lifetime
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US333690A
Inventor
Helmut Richter
Eckehard Forster
Edgar Spetzler
Jochen Wendorff
Heinrich Wilhelm Rommerswinkel
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Thyssen AG
Thyssen Niederrhein AG
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Thyssen Niederrhein AG
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Publication of US3885957A publication Critical patent/US3885957A/en
Assigned to THYSSEN AKTIENGESELLSCHAFT reassignment THYSSEN AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: THYSSEN NIEDERRHEIN AG HUTTEN-UND-WALZWERKE
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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
    • 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
    • C21C7/064—Dephosphorising; Desulfurising

Abstract

A steel melt is desulfurized in a ladle lined with dolomite magnesite or other refractory lining have an aluminum oxide content in excess of 70 percent (wt), by injecting at least 2,000 mm below the melt surface, finely divided calcium-containing compound after a basic-slag layer is applied to the surface of the deoxidized steel melt. The melt is held at a temperature of at least 1,530*C during desulfurization.

Claims (11)

1. A METHOD OF DESULFURIZING A DEOXIDIZED STEEL MELT COMPRISING THE STEPS OF: COVERING THE DEOXIDIZED STEEL MELT WITH A BASIC-SLAG LAYER CONTAINING AT MOST 4 PERCENT BY WEIGHT FEO INTRODUCING AT A LOCATION AT LEAST 2,000 MM BELOW THE SURFACE OF THE DEOXIDIZED STEEL MELT COVERED WITH SAID BASIC SLAG LAYER A STREAM OF A CALCIUM-CONTAINING SUBSTANCE IN FINELY DIVIDED FORM IN A NUETRAL CARRIER GAS; MAINTAINING THE TEMPERATURE OF SAID MELT DURING THE INTRODUCTION OF SAID CALCIUM-CONTAINING SUBSTANCE THERETO AT AT LEAST 1,530*C, MAINTAINING SAID MOLTEN STEEL IN CONTACT WITH A LINING CONTAINING AT LEAST 70 PERCENT BY WEIGHT ALUMINIUM OXIDE DURING INTRODUCTION OF THE CALCIUM-CONTAINING SUBSTANCE THERETO; AND THE INTRODUCTION OF SAID CALCIUM-CONTAINING SUBSTANCE IS CARRIED OUT SO THAT SAID STEEL MELT CONTAINS AT LEAST 0.015 PERCENT BY WEIGHT ALUMINIUM.
2. The method defined in claim 1 wherein said basic-slag layer has an FeO content in excess of 2 percent, further comprising controlling the introduction of the calcium-containing substance to reduce the FeO content of the basic slag layer to less than 2 percent by weight.
3. The method defined in claim 1 wherein said gas is argon.
4. The method defined in claim 3 wherein said calcium-containing substance is introduced into said melt by a lance extending downwardly through the melt.
5. The method defined in claim 1 wherein said basic slag layer has essentially the following composition: 45 to 75 percent by weight calcium oxide, 0 to 25 percent by weight calcium fluoride, 0 to 20 percent by weight aluminum oxide, 0 to 30 percent by weight silicon oxide, 0.1 to 4 percent by weight FeO, and 0 to 10 percent by weight manganese oxide and/or phosphorus pentoxide and/or magnesium oxide.
6. The method defined in claim 5 wherein said slag has approximately the following composition: 50 percent by weight calcium oxide, 20 percent by weight calcium fluoride, 12 percent by weight aluminum oxide, 10 percent by weight silicon oxide, 0.5 percent by weight FeO, the balance being manganese oxide, phosphorus pentoxide and magnesium oxide.
7. The method defined in claim 5 wherein said calcium-containing substance is added to said melt in an amount corresponding to substantially 1.2 to 1.5 kg of calcium per ton of molten steel.
8. The method defined in claim 7 wherein said calcium-containing substance is selected from the group which consists of elemental calcium, a calcium-silicon, intermetallic compound or alloy, and calcium carbide.
9. The method defined in claim 8 wherein said calcium-containing substance is a calcium ferrosilicon containing substantially 30 percent by weight calcium, 60 percent by weight silicone and 10 percent by weight iron, the calcium ferro silicone being introduced into said melt in an amount of substantially 4 to 5 kgs per ton of molten steel.
10. The method defined in claim 8 wherein said molten steel contains at least 0.015 percent by weight of the deoxidizing agent for said melt.
11. The method defined in claim 1 wherein said slag layer is present in an amount of substantially 1 to 15 kgs per ton of molten steel.
US333690A 1972-03-01 1973-02-20 Method for the desulfurization of a steel melt Expired - Lifetime US3885957A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2209902A DE2209902B2 (en) 1972-03-01 1972-03-01 Process for the desulphurization of steel melts

Publications (2)

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US3885957A true US3885957A (en) 1975-05-27
US3885957B1 US3885957B1 (en) 1986-12-16

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US (1) US3885957A (en)
JP (1) JPS5133761B2 (en)
BE (1) BE795333A (en)
CA (1) CA980578A (en)
DE (1) DE2209902B2 (en)
FR (1) FR2173952B1 (en)
GB (1) GB1372672A (en)
IT (1) IT979331B (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985550A (en) * 1975-01-23 1976-10-12 United States Steel Corporation Method of producing low sulfur steel
US3992195A (en) * 1974-04-20 1976-11-16 Thyssen Niederrhein Ag Hutten- Und Walzwerke Process for the production of steel with increased ductility
US4008104A (en) * 1974-05-09 1977-02-15 Nippon Steel Corporation Method for dephosphorization and denitrification of an alloy containing easily oxidizable components
US4036635A (en) * 1975-06-18 1977-07-19 Thyssen Niederrhein Ag Hutten- Und Walzwerke Process for making a steel melt for continuous casting
US4067729A (en) * 1976-09-01 1978-01-10 Wolfgang Holzgruber Desulfurization of liquid iron melts
US4067730A (en) * 1974-04-20 1978-01-10 Thyssen Niederrhein Ag Hutten-Und Walzwerke Process for the production of steel with increased ductility
US4069039A (en) * 1976-06-23 1978-01-17 A. Finkl & Sons Co. Method for desulfurization using arc heat under vacuum
US4123258A (en) * 1974-04-20 1978-10-31 Thyssen Niederrhein Process for the production of steel with increased ductility and for the desulfurization of a steel melt
US4154605A (en) * 1978-03-08 1979-05-15 Skw Trostberg Aktiengesellschaft Desulfurization of iron melts with fine particulate mixtures containing alkaline earth metal carbonates
US4169724A (en) * 1977-02-26 1979-10-02 Skw Trostberg Aktiengesellschaft Desulfurization of iron melts
US4194903A (en) * 1976-10-12 1980-03-25 Hoesch Werke Aktiengesellschaft Method of producing steel with the lowest possible sulfur content by desulfurization of pig iron with magnesium coke
US4213780A (en) * 1978-07-12 1980-07-22 Lava Crucible Refractories Co. Method of introducing calcium and calcium alloys into a vessel of molten metal
US4232854A (en) * 1978-05-26 1980-11-11 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same
US4238227A (en) * 1979-06-27 1980-12-09 United States Steel Corporation Cleansing of steel by gas rinsing
US4341554A (en) * 1981-04-02 1982-07-27 Jones & Laughlin Steel Incorporated Process for desulfurizing steel
US4392887A (en) * 1981-12-04 1983-07-12 Arbed S.A. Method of desulfurizing an iron melt
EP0092652A1 (en) * 1982-04-12 1983-11-02 Elkem A/S Apparatus for treating molten metal and method for refining steel melts
USRE31676E (en) 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US4483710A (en) * 1981-03-31 1984-11-20 Union Carbide Corporation Addition agent for adding vanadium to iron base alloys
EP0137618A2 (en) * 1983-08-12 1985-04-17 Pfizer Inc. Process and apparatus for adding calcium to a bath of molten ferrous material
US4941913A (en) * 1988-07-22 1990-07-17 Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. Process for heating steel melts as well as device for performing this process
US5480127A (en) * 1994-02-11 1996-01-02 Leybold Durferrit Gmbh Apparatus for the melting and treatment of metal
WO2002079522A1 (en) * 2001-04-02 2002-10-10 Nucor Corporation Ladle refining of steel
CN105385811A (en) * 2015-11-27 2016-03-09 山东钢铁股份有限公司 Production method for steel containing aluminum

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2419176B2 (en) * 1974-04-20 1976-02-26 Thyssen Niederrhein AG Hütten- und Walzwerke, 4200 Oberhausen METHOD OF ADDING ALKALINE EARTH TREATMENT AGENTS TO STEEL MELT
JPS5123421A (en) * 1974-08-22 1976-02-25 Nippon Steel Corp SHINKUDATSUGASUZOSAISEIRENHOHO
CA1069314A (en) * 1974-09-20 1980-01-08 Sumitomo Metal Industries, Ltd. Process for the addition of calcium to molten steel
LU80692A1 (en) * 1978-12-21 1980-07-21 Arbed METHOD AND DEVICE FOR DESULFURING IRON MELT
LU82977A1 (en) * 1980-12-03 1982-07-07 Arbed METHOD FOR DESOLVERIFYING MELTING IRON
LU83247A1 (en) * 1981-03-23 1983-02-22 Arbed METHOD AND DEVICE FOR TREATING METAL MELT IN THE METALURGICAL PROCESSES
LU83314A1 (en) * 1981-04-24 1983-03-24 Arbed METHOD AND DEVICE FOR DESULFURING IRON MELT
JPH02166217A (en) * 1988-12-20 1990-06-26 Metal Res Corp:Kk Manufacture of low carbon iron-chromium alloy

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268326A (en) * 1962-11-29 1966-08-23 Hoerder Huettenunion Ag Treatment of metal melts
US3575695A (en) * 1967-10-18 1971-04-20 Nippon Kokan Kk Deoxidation method of molten steel
US3598573A (en) * 1968-04-29 1971-08-10 Sueddeutsche Kalkstickstoff Desulfurization agent and process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268326A (en) * 1962-11-29 1966-08-23 Hoerder Huettenunion Ag Treatment of metal melts
US3575695A (en) * 1967-10-18 1971-04-20 Nippon Kokan Kk Deoxidation method of molten steel
US3598573A (en) * 1968-04-29 1971-08-10 Sueddeutsche Kalkstickstoff Desulfurization agent and process

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992195A (en) * 1974-04-20 1976-11-16 Thyssen Niederrhein Ag Hutten- Und Walzwerke Process for the production of steel with increased ductility
US4067730A (en) * 1974-04-20 1978-01-10 Thyssen Niederrhein Ag Hutten-Und Walzwerke Process for the production of steel with increased ductility
US4123258A (en) * 1974-04-20 1978-10-31 Thyssen Niederrhein Process for the production of steel with increased ductility and for the desulfurization of a steel melt
US4008104A (en) * 1974-05-09 1977-02-15 Nippon Steel Corporation Method for dephosphorization and denitrification of an alloy containing easily oxidizable components
US3985550A (en) * 1975-01-23 1976-10-12 United States Steel Corporation Method of producing low sulfur steel
US4036635A (en) * 1975-06-18 1977-07-19 Thyssen Niederrhein Ag Hutten- Und Walzwerke Process for making a steel melt for continuous casting
US4069039A (en) * 1976-06-23 1978-01-17 A. Finkl & Sons Co. Method for desulfurization using arc heat under vacuum
US4067729A (en) * 1976-09-01 1978-01-10 Wolfgang Holzgruber Desulfurization of liquid iron melts
US4194903A (en) * 1976-10-12 1980-03-25 Hoesch Werke Aktiengesellschaft Method of producing steel with the lowest possible sulfur content by desulfurization of pig iron with magnesium coke
US4169724A (en) * 1977-02-26 1979-10-02 Skw Trostberg Aktiengesellschaft Desulfurization of iron melts
US4154605A (en) * 1978-03-08 1979-05-15 Skw Trostberg Aktiengesellschaft Desulfurization of iron melts with fine particulate mixtures containing alkaline earth metal carbonates
US4232854A (en) * 1978-05-26 1980-11-11 Barbakadze Dzhondo F Method of introducing powdered reagents into molten metals and apparatus for effecting same
US4213780A (en) * 1978-07-12 1980-07-22 Lava Crucible Refractories Co. Method of introducing calcium and calcium alloys into a vessel of molten metal
US4238227A (en) * 1979-06-27 1980-12-09 United States Steel Corporation Cleansing of steel by gas rinsing
US4483710A (en) * 1981-03-31 1984-11-20 Union Carbide Corporation Addition agent for adding vanadium to iron base alloys
US4341554A (en) * 1981-04-02 1982-07-27 Jones & Laughlin Steel Incorporated Process for desulfurizing steel
US4392887A (en) * 1981-12-04 1983-07-12 Arbed S.A. Method of desulfurizing an iron melt
EP0092652A1 (en) * 1982-04-12 1983-11-02 Elkem A/S Apparatus for treating molten metal and method for refining steel melts
USRE31676E (en) 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
EP0137618A2 (en) * 1983-08-12 1985-04-17 Pfizer Inc. Process and apparatus for adding calcium to a bath of molten ferrous material
EP0137618A3 (en) * 1983-08-12 1986-04-02 Pfizer Inc. Process and apparatus for adding calcium to a bath of molten ferrous material
US4941913A (en) * 1988-07-22 1990-07-17 Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. Process for heating steel melts as well as device for performing this process
US5480127A (en) * 1994-02-11 1996-01-02 Leybold Durferrit Gmbh Apparatus for the melting and treatment of metal
WO2002079522A1 (en) * 2001-04-02 2002-10-10 Nucor Corporation Ladle refining of steel
US6547849B2 (en) 2001-04-02 2003-04-15 Nucor Corporation Ladle refining of steel
CN105385811A (en) * 2015-11-27 2016-03-09 山东钢铁股份有限公司 Production method for steel containing aluminum

Also Published As

Publication number Publication date
FR2173952A1 (en) 1973-10-12
FR2173952B1 (en) 1976-11-05
US3885957B1 (en) 1986-12-16
DE2209902A1 (en) 1973-09-27
JPS48100311A (en) 1973-12-18
CA980578A (en) 1975-12-30
DE2209902B2 (en) 1975-01-16
BE795333A (en) 1973-05-29
JPS5133761B2 (en) 1976-09-21
GB1372672A (en) 1974-11-06
IT979331B (en) 1974-09-30

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Legal Events

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AS Assignment

Owner name: THYSSEN AKTIENGESELLSCHAFT, AUGUST-THYSSEN-STRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:THYSSEN NIEDERRHEIN AG HUTTEN-UND-WALZWERKE;REEL/FRAME:004018/0293

Effective date: 19820629

Owner name: THYSSEN AKTIENGESELLSCHAFT, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:THYSSEN NIEDERRHEIN AG HUTTEN-UND-WALZWERKE;REEL/FRAME:004018/0293

Effective date: 19820629

RR Request for reexamination filed

Effective date: 19851115

B1 Reexamination certificate first reexamination