US3607234A - Steel-refining composition containing portland cement and fluorspar - Google Patents

Steel-refining composition containing portland cement and fluorspar Download PDF

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Publication number
US3607234A
US3607234A US830341A US3607234DA US3607234A US 3607234 A US3607234 A US 3607234A US 830341 A US830341 A US 830341A US 3607234D A US3607234D A US 3607234DA US 3607234 A US3607234 A US 3607234A
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United States
Prior art keywords
steel
refining agent
percent
fluorspar
portland cement
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Expired - Lifetime
Application number
US830341A
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English (en)
Inventor
Takaho Kawawa
Noburo Shimada
Masaji Kogi
Hidetaro Nemoto
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JFE Engineering Corp
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Nippon Kokan Ltd
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Publication date
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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
    • C21C7/076—Use of slags or fluxes as treating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • Curtis Attorney-Flynn& Frishauf I ABSTRACT A steel-refining agent which is composed of 35% to 65% of Portland cement, 5% to 20% offluors ar, 20% to 40% of chamqg gpmer, 2% m 15% of 5011 5 2% to 15% of a carbon source, which is coke breeze or raphite powder, and further 2% to 15% of borax, wherein more than 50% of mixing particles have a diameter of less than 0.044 mm.
  • This invention relates to a novel steel-refining agent which is added into mold wherein liquid steel is cast and more particularly is east continuously.
  • FIGURE illustrates a cross section of a portion of a continuous casting device to show a relation between the surface of slag formed by the steel refining agent and a pouring nozzle, where the steel-refining agent is added into the continuous casting mould.
  • novel steel-refining agent is characterized by the following composition, grain size and chemical and physical properties.
  • the percentage of particles having diameters of less than 0.44 mm. should be more than 50 percent. 3.
  • the refining agent should have a melting point of from 1,000 to l,300 C., and a viscosity of 000 o IO pgises when melted by liquid steel.
  • the purpose of adding borax to the steel-refining agent of this invention is to lower the melting point of said agent to effectively prevent oxidation of the surface of said liquid steel This is especially desirable for some kinds of steel, for example killed steel.
  • the steel-refining agent of this invention is utilized in the following manner:
  • the novel refining agent in an amount of 0.2 to 2.5 kg. per ton of the molten steel is packed in bags of paper of synthetic resin and these bags are placed in the bottom of a mold or hung therein by means of fine metal wires.
  • the bags are burned to spread the refining agent over the surface of rising liquid steel.
  • a melting point of the steel refining agent ranges from l,00O to 1,300 C. whereas the temperature of the molten steel is commonly more than 1,300 C., the refining agent will be melted quickly to readily cover the surface of said liquid steel. Since the refining agent has a property of forming slag as flotation of nonmetallic inclusions in liquid steel bath reaches the refining agent slag, said inclusions readily react with a slay layer and adsorbed thereby.
  • novel steel-refining agent is utilized to cast killed steel ingots by the bottom pouring method it is able to eliminate the use of a coating material which is usually employed to coat inside wall of a mould. Further, nonmetallic inclusions and some streak flaws, such as said inclusion, sand seams and the like are reduced.
  • table 1 shows comparison of the above flaws of low carbon killed steel cast by the prior method and by the novel method in ordinary bottom pouring process.
  • the relationship between the surface of slag layer formed by the refining agent and the nozzle 4 is as shown in the drawing.
  • the poured liquid steel solidifies to form a cast slab.
  • the melting point of the steel refining agent is low, as soon as it comes to contact with liquid steel it will be melted to cover the surface of said liquid steel to prevent oxidation thereof by the atmosphere. In this case, it is apparently found that the component of said steel-refining agent changes as shown in table 2.
  • melting point of the refining agent can form a slag on the surface of said liquid steel which can readily adsorb and remove such nonmetallic contaminants as silica, alumina, etc., in liquid steel.
  • the slag thus formed adheres to the surface of cast slab and then is removed from the mould.
  • novel steel refining agent is employed for the continuous casting process of billets and blooms, surface defects thereof can be greatly reduced. Accordingly, repairing loss resulting from some surface defects can be improved as shown in tables 3 and 4.
  • the novel steel refining agent is not used, the surface of liquid steel killed by aluminum in mold tends to be oxidized by the atmosphere as above described, serum or other slag is formed which caused surface defects.
  • the novel refining agent it can not only absorb such serum or slag but also prevent them from being formed. Accordingly, a use of this invention agent can remarkably improved its operability of said continuous casting process and to reduce repairing loss of material surface, while there are many operational difficulties in ordinary continuous casting process of Al-killed steel by reason that said tundish nozzle has tendency to clog.
  • Example I For ordinary steel Portland cement 44; Fluorspar l07r Chamotte brick powder 32'; Soda ash 57: Coke breeze or graphite powder 9%
  • Example 2 For aluminum killed steel Portland cement 44; Fluorspar 20% Chamotte brick powder 227 Soda ash 5'1 Coke breeze 9%
  • Example 3 For aluminum killed steel Portland cement 44% Fluorspar lO'Z Chamotte brick powder 22% Soda ash 51 Coke breeze or graphite powder 9; Borax l0; Example dzFor stainless steel Portland cement 44' ⁇ Fluorspar 19'71 Chamotte brick powder 24; Soda ash 81 Coke or graphite powder 57:
  • Example 5 ln addition to compounding agent of Example I; Foaming substance 0.0l to 5% (for example, vermiculite, mordenite and foaming synthetic resin).
  • a steel-refining agent which is composed of 35 to 60 percent of Portland cement, 5 to 20 percent offluorspar, 20 to 40 percent of Chamotte powder, 2 to 15 percent of soda ash and 2 to 15 percent of carbon source, wherein more than 50 percent of mixing particles have a diameter of less than 0.044
  • a steel refining agent which is composed of 35 to 60 percent of Portland cement, 5 to 20 percent of fluorspar, 20 to 40 percent of Chamotte powder, 0 to 15 percent of soda ash, 2 to 15 percent of carbon source and 2 to 15 percent of borax, wherein more than 50 percent of mixing particles have a diameter of less than 0.044 mm.
  • a steel-refining agent having a chemical composition of SiO 34.8%, A1 0 14.4%, CaO 30.6%, CaF 8.0%, Na O 3.2% and C 5.7%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
US830341A 1968-06-08 1969-06-04 Steel-refining composition containing portland cement and fluorspar Expired - Lifetime US3607234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3908668 1968-06-08

Publications (1)

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US3607234A true US3607234A (en) 1971-09-21

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US830341A Expired - Lifetime US3607234A (en) 1968-06-08 1969-06-04 Steel-refining composition containing portland cement and fluorspar

Country Status (4)

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US (1) US3607234A (enrdf_load_stackoverflow)
DE (1) DE1928844A1 (enrdf_load_stackoverflow)
FR (1) FR2010451A1 (enrdf_load_stackoverflow)
GB (1) GB1221618A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708314A (en) * 1970-08-12 1973-01-02 Sumitomo Metal Ind Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process
US4462834A (en) * 1983-06-16 1984-07-31 Labate M D Ladle covering compound
EP0162679A1 (en) * 1984-05-21 1985-11-27 Metro Materials Corporation Composition and process to create foaming slag cover for molten steel
US6174347B1 (en) 1996-12-11 2001-01-16 Performix Technologies, Ltd. Basic tundish flux composition for steelmaking processes
US6503318B2 (en) * 2000-03-29 2003-01-07 National Research Council Of Canada Conductive concrete composition
EP3219692A1 (en) * 2016-03-16 2017-09-20 Kerneos S.A. Reactive material based on calcium aluminate and carbon, its process of preparation and its uses for refining metal melts or slags

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA783344B (en) * 1977-06-20 1979-06-27 British Steel Corp Slag powders
DE8602134U1 (de) * 1986-01-29 1986-03-13 HEQU-Plast GmbH Kunststoffverarbeitung, 89150 Laichingen Koffer zur Aufbewahrung und/oder zur Präsentation von Schriftstücken
DE4210179C2 (de) * 1992-03-26 1994-09-15 Socametal N V S A Gemisch als Beimengung beim Erschmelzen und Feinen von Stahl und Gußeisen und Verfahren zu seiner Anwendung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US253158A (en) * 1882-01-31 Milton h
GB191022519A (en) * 1910-05-23 1911-07-20 Friedrich Schofer Improvements in the Manufacture of Tubular and like Sections of Chimney Flues.
GB217343A (en) * 1923-03-21 1924-06-19 Joseph Hay Amies An improved cementitious composition, and method of making the same
US2126786A (en) * 1935-10-07 1938-08-16 American Magnesium Metals Corp Method of melting and casting magnesium and alloys rich in magnesium
US2728681A (en) * 1952-11-25 1955-12-27 Clipson Samuel Compositions for surfacing walls, ceilings and the like
US3181959A (en) * 1962-02-12 1965-05-04 Kaiser Aluminium Chem Corp Refractory
US3376146A (en) * 1964-10-30 1968-04-02 Mobil Oil Corp Low density cement composition
US3516821A (en) * 1965-09-14 1970-06-23 Max Gerhard Neu Protective covering for molten metal

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US253158A (en) * 1882-01-31 Milton h
GB191022519A (en) * 1910-05-23 1911-07-20 Friedrich Schofer Improvements in the Manufacture of Tubular and like Sections of Chimney Flues.
GB217343A (en) * 1923-03-21 1924-06-19 Joseph Hay Amies An improved cementitious composition, and method of making the same
US2126786A (en) * 1935-10-07 1938-08-16 American Magnesium Metals Corp Method of melting and casting magnesium and alloys rich in magnesium
US2728681A (en) * 1952-11-25 1955-12-27 Clipson Samuel Compositions for surfacing walls, ceilings and the like
US3181959A (en) * 1962-02-12 1965-05-04 Kaiser Aluminium Chem Corp Refractory
US3376146A (en) * 1964-10-30 1968-04-02 Mobil Oil Corp Low density cement composition
US3516821A (en) * 1965-09-14 1970-06-23 Max Gerhard Neu Protective covering for molten metal

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3708314A (en) * 1970-08-12 1973-01-02 Sumitomo Metal Ind Agent for adding to a mould in which molten ferritic stainless steel is cast by a continuous casting process
US4462834A (en) * 1983-06-16 1984-07-31 Labate M D Ladle covering compound
EP0162679A1 (en) * 1984-05-21 1985-11-27 Metro Materials Corporation Composition and process to create foaming slag cover for molten steel
US6174347B1 (en) 1996-12-11 2001-01-16 Performix Technologies, Ltd. Basic tundish flux composition for steelmaking processes
US6179895B1 (en) 1996-12-11 2001-01-30 Performix Technologies, Ltd. Basic tundish flux composition for steelmaking processes
US6503318B2 (en) * 2000-03-29 2003-01-07 National Research Council Of Canada Conductive concrete composition
EP3219692A1 (en) * 2016-03-16 2017-09-20 Kerneos S.A. Reactive material based on calcium aluminate and carbon, its process of preparation and its uses for refining metal melts or slags
WO2017158121A1 (en) * 2016-03-16 2017-09-21 Kerneos S.A. Reactive material based on calcium aluminate and carbon, its process of preparation and its uses for refining metal melts or slags

Also Published As

Publication number Publication date
FR2010451A1 (enrdf_load_stackoverflow) 1970-02-13
GB1221618A (en) 1971-02-03
DE1928844A1 (de) 1970-06-11

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