WO2011054872A1 - Carbonaceous fireproof material for use when casting steel in a bottom casting process and formed parts produced thereof - Google Patents

Carbonaceous fireproof material for use when casting steel in a bottom casting process and formed parts produced thereof Download PDF

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Publication number
WO2011054872A1
WO2011054872A1 PCT/EP2010/066743 EP2010066743W WO2011054872A1 WO 2011054872 A1 WO2011054872 A1 WO 2011054872A1 EP 2010066743 W EP2010066743 W EP 2010066743W WO 2011054872 A1 WO2011054872 A1 WO 2011054872A1
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Prior art keywords
refractory material
material according
steel
carbonaceous
molded article
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PCT/EP2010/066743
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German (de)
French (fr)
Inventor
Werner Ritter
Klaus Guido Ruwier
Werner SCHÖNWELSKI
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Lwb Refractories Gmbh
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Publication of WO2011054872A1 publication Critical patent/WO2011054872A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/066—Manufacturing, repairing or reinforcing ingot moulds
    • B22D7/068—Manufacturing, repairing or reinforcing ingot moulds characterised by the materials used therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D9/00—Machines or plants for casting ingots
    • B22D9/006—Machines or plants for casting ingots for bottom casting
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/013—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics containing carbon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/101—Refractories from grain sized mixtures
    • C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62665—Flame, plasma or melting treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427—Silicates other than clay, e.g. water glass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6021—Extrusion moulding
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
    • C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium

Definitions

  • the invention relates to a refractory material for lining the distribution system of a molten steel during the casting of steel in the sub-casting process and produced therefrom
  • Continuous casting process are solidified in which the liquid metal is poured into a water-cooled mold open on both sides. At the lower opening of the mold, the metal emerges as a solidified strand.
  • the used hollowware was and is because of
  • Unavoidable thermo-mechanical erosion causes particles of the refractory material to pass into the molten steel, which in many cases leads to non-metallic inclusions in the final casting and prevents its further processing or leads to faulty steel components with poor mechanical properties. This is associated with considerable extra costs, especially for very large castings. With increasing quality requirements also in the
  • the invention is therefore based on the object to propose the initially mentioned refractory material and moldings produced therefrom, in which non-metallic inclusions are reliably prevented in the steel in order to increase the steel quality.
  • a molded article produced from the refractory material according to the invention is characterized in that the molded article is extruded as a hollow product or, alternatively, dry-pressed carbon-bonded.
  • the binding component and / or the impregnating and / or coating component is a synthetic resin, tar, pitch, tar or pitch substitute or a
  • Solid components such as carbon black, graphite, resin powder,
  • Refractory material is. This is of particular interest when the refractory material for moldings involves more complex geometries.
  • the refractory material After coating, impregnating or impregnating, the refractory material may be subjected to a suitable temperature treatment.
  • the invention is mainly based on the fact that carbonaceous components in the steel substructure have not yet been used. According to the invention has been achieved to adapt and apply such materials for the production of hollowware.
  • the invention will be explained in more detail with reference to a drawing showing only a schematic embodiment. In the drawing show
  • Fig. 1 is a casting system for the steel substructure in
  • Fig. 2 is a comparison of casting bones
  • a lower casting 1 for block casting with two casting molds 2, 3 is shown. Between the casting molds 2, 3 is a sprue 4 with an inlet funnel 5, can be filled into the molten molten steel by means of a casting vessel, not shown. Below the inlet funnel 5 is a plurality of
  • Non-metallic outbreaks of the moldings largely expressed reliably can be prevented, causing the
  • a casting bone 10 is shown, the left half is solidified in a molded block without carbon and the right half in a molding according to the invention. It can be seen clearly that the left area is covered with a "crust" of non-metallic inclusions.

Abstract

The invention relates to a fireproof material for cladding the distribution system of a steel melt when casting steel in a bottom casting process, and formed parts made of such a fireproof material. In order to reliably prevent non-metallic inclusions in the steel in a bottom casting process, and to increase the steel quality, the invention proposes that the fireproof material comprises carbonaceous components at least on the steel side, is bonded to and/or coated with and/or permeated by said components. Formed parts made of such a fireproof material can either be continuously drawn as a hollow product or carbon bonded by means of dry pressing.

Description

Kohlenstoffhaltiges feuerfestes Material zur Verwendung beim Vergießen von Stahl im Untergussverfahren und daraus  Carbonaceous refractory material for use in casting and casting of steel
hergestellte Formkörper  produced moldings
Die Erfindung betrifft ein Feuerfestmaterial zur Auskleidung des Verteilersystems einer Stahlschmelze beim Gießen von Stahl im Untergussverfahren sowie daraus hergestellte The invention relates to a refractory material for lining the distribution system of a molten steel during the casting of steel in the sub-casting process and produced therefrom
Formkörper. Es ist aus der Praxis bekannt, dass heute über 90% des weltweit produzierten Stahls im sogenannten Moldings. It is known from the practice that today over 90% of the steel produced worldwide in the so-called
Stranggussverfahren verfestigt werden, bei dem das flüssige Metall in eine beidseitig offene, wassergekühlte Kokille gegossen wird. An der unteren Öffnung der Kokille tritt das Metall als erstarrter Strang aus. Continuous casting process are solidified in which the liquid metal is poured into a water-cooled mold open on both sides. At the lower opening of the mold, the metal emerges as a solidified strand.
Daneben werden große Mengen Stahl auch in Blockkokillen gegossen, wenn eine Stahlsorte beispielsweise zu empfindlich auf die beim Strangguss auftretenden Biegespannungen bei hoher Temperatur reagiert oder wenn extreme Blockdicken für Schmiede- und Grobblechanwendungen gefordert sind. Dabei werden über ein feuerfestes keramisches stahlgefaßtes In addition, large quantities of steel are also poured into block molds, if a steel grade, for example, reacts too sensitively to the bending stresses occurring during continuous casting at high temperature, or if extreme block thicknesses are required for forging and heavy plate applications. These are about a refractory ceramic steelgefaßtes
Rohrsystem über einen zentralen Einguß eine unterschiedliche Anzahl Kokillen bodenseitig von unten befüllt. Pipe system filled via a central sprue a different number of molds bottom side from below.
Hierbei handelt es sich um das an sich klassische Verfahren zürn Vergießen von Stahl, kurz Untergussverfahren genannt. Das im Bereich der Verteilerstränge verwendete feuerfeste keramische Material wird aufgrund seiner röhrenförmigen This is the classic method for casting steel, in short called submerged casting. The refractory ceramic material used in the distribution line is due to its tubular
Struktur kurz Hohlware genannt. Das Untergussverfahren erlebte in den letzten Jahren durch Entwicklung neuer Stahllegierungen und durch erhöhte Notwendigkeit Structure called short hollowware. The sub-casting process has been experiencing new development in recent years Steel alloys and by increased need
endabmessungsnahen Gießens eine Renaissance. near-final casting a renaissance.
Die dazu verwendete Hohlware wurde und wird wegen der The used hollowware was and is because of
teilweise komplexen Geometrien der Bauteile vorwiegend im Strangziehverfahren in Form gebracht. Die für dieses partially complex geometries of the components mainly in the pultrusion brought into shape. The for this
Formgebungsverfahren notwendige Plastizität der Grünmasse wird regulär durch hohe Anteile an Ton und Wasser erreicht. Zusätzlich war traditionell der Grobkornanteil dieser Massen Schamotte, also vorgebrannter Ton, so dass insgesamt die Zusammensetzung der Hohlware meist den Si02- reicheren Shaping process necessary plasticity of the green mass is regularly achieved by high levels of clay and water. In addition, the coarse grain fraction of these masses was traditionally chamotte, that is prebaked clay, so that the composition of the hollowware is generally the Si0 2 - richer
Bereichen des Systems A1203- Si02 zuzuordnen war. In der Areas of the system A1 2 0 3 - Si0 2 was assigned. In the
Literatur sind zahlreiche Hinweise auf Wechselwirkungen zwischen Stahllegierungselementen (vorwiegend Mangan und Chrom) und Feuerfestbestandteilen (vorwiegend freies Si02) zu finden. Aufgrund dieser Wechselwirkungen und der Numerous references to interactions between steel alloy elements (predominantly manganese and chromium) and refractory constituents (predominantly free Si0 2 ) can be found in literature. Because of these interactions and the
unvermeidbaren thermomechanischen Erosion gehen Partikel des Feuerfestmaterials in die Stahlschmelze über, was in vielen Fällen zu nichtmetallischen Einschlüssen im finalen Gussstück führt und dessen Weiterverarbeitung verhindert oder zu fehlerhaften Stahlbauteilen mit schlechten mechanischen Eigenschaften führt. Dies ist insbesondere bei oft sehr großen Gussstücken mit erheblichen Mehrkosten verbunden. Mit steigenden Qualitätsanforderungen auch an im Unavoidable thermo-mechanical erosion causes particles of the refractory material to pass into the molten steel, which in many cases leads to non-metallic inclusions in the final casting and prevents its further processing or leads to faulty steel components with poor mechanical properties. This is associated with considerable extra costs, especially for very large castings. With increasing quality requirements also in the
Untergussverfahren vergossenem Stahl musste deshalb im Rahmen der Weiterentwicklung von Hohlware zunächst der Gehalt an freiem Si02 möglichst reduziert werden. Das gelang durch In the context of the further development of hollowware, the content of free Si0 2 had to be reduced as far as possible. That succeeded
Einsatz eines AI2O3- reicheren Grobkorns (beispielsweise Sinterbauxit), in den 1990er Jahren durch Herstellung bestimmter Use of an Al 2 O 3 -rich coarse grain (for example sintered bauxite), in the 1990s by making certain
Formate im Halbtrockenverfahren an hydraulischen Pressen durch Reduzierung des Tonanteils und  Semi-dry process formats on hydraulic presses by reducing the clay content and
durch Optimierung des Bindekonzepts in den vergangenen Jahren.  by optimizing the binding concept in recent years.
Durch diese Maßnahmen konnte bereits die Gefahr durch nichtmetallische Einschlüsse (Lunker) im Stahlblock Through these measures could already the danger of non-metallic inclusions (voids) in the steel block
weitgehend minimiert werden. Als gebranntes keramisches Material verblieben für die Hohlware aber immer noch diebe largely minimized. As burned ceramic material remained for the hollowware but still the
Nachteile einer nur mäßigen Temperaturwechselbeständigkeit. Dies führt zur Rissbildung bei Gießbeginn und zum Ankleben der Keramik an den verbleibenden Metallresten (sog. Disadvantages of only moderate thermal shock resistance. This leads to crack formation at the start of casting and sticking of the ceramic to the remaining metal residues (so-called.
„Gießknochen") nach dem Gießen. Dadurch werden die Trennung und Wiederverwertung der Stahlteile erschwert. "Casting bones") after casting, which makes it difficult to separate and reuse the steel parts.
Es ist auch bereits vorgeschlagen worden (DE 101 40 019 Cl), das Verteilersystem mit aus hochreinem Aiuminiumoxid It has also been proposed (DE 101 40 019 C1), the distribution system with high-purity Aiuminiumoxid
bestehenden Elementen zu versehen, welche mit der Strömung der Schmelze in Kontakt gebracht werden, um daran existing elements which are brought into contact with the flow of the melt to it
Verunreinigungen abzuscheiden. To separate impurities.
Die Vorteile kohlenstoffhaltiger und kohlenstoffgebundener feuerfester Materialien in Anwendungen der Eisen- und The Benefits of Carbonaceous and Carbon Bonded Refractory Materials in Iron and Steel Applications
Stahlindustrie sind für sich seit langem bekannt. Dabei werden die Eigenschaften von Kohlenstoffmaterialien Steel industry have long been known for themselves. Thereby the properties of carbon materials become
ausgenutzt, dass sie von Stahl schlechter benetzbar sind als Keramik und meist noch flüchtige Bestandteile enthalten, die bei Temperatureinwirkung ein Dampfpolster bilden und dadurch Thermoschock mildern und Infiltration verhindern. Sekundär wird dadurch die Erosion des Feuerfestmaterials verhindert, nichtmetallische Einschlüsse im Stahl werden vermieden und die Stahlqualität wird verbessert. Die Wiederverwendung der Gießknochen wird deutlich erleichtert. exploited that they are less wettable by steel than ceramics and usually still contain volatile constituents that form a vapor cushion when exposed to temperature, thereby mitigating thermal shock and preventing infiltration. Secondarily, this prevents the erosion of the refractory material, non-metallic inclusions in the steel are avoided and the steel quality is improved. The reuse of the casting bones is greatly facilitated.
Der Erfindung liegt daher die Aufgabe zu Grunde, das eingangs genannte Feuerfestmaterial und daraus hergestellte Formkörper vorzuschlagen, bei denen nichtmetallische Einschlüsse im Stahl zuverlässig verhindert werden, um die Stahlqualität zu erhöhen . The invention is therefore based on the object to propose the initially mentioned refractory material and moldings produced therefrom, in which non-metallic inclusions are reliably prevented in the steel in order to increase the steel quality.
Ein entsprechendes erfindungsgemäßes Feuerfestmaterial zeichnet sich dadurch aus, dass das Feuerfestmaterial A corresponding refractory material according to the invention is characterized in that the refractory material
mindestens stahlseitig kohlenstoffhaltige Komponenten at least steel-sided carbonaceous components
enthält, mit diesen Komponenten gebunden ist und/oder beschichtet und/oder getränkt ist. contains, is bound with and / or coated and / or impregnated with these components.
Ein aus dem erfindungsgemäßen Feuerfestmaterial hergestellter Formkörper ist dadurch gekennzeichnet, dass der Formkörper als Hohlware stranggezogen oder, alternativ, trockengepresst kohlenstoffgebunden ist. A molded article produced from the refractory material according to the invention is characterized in that the molded article is extruded as a hollow product or, alternatively, dry-pressed carbon-bonded.
Gemäß einer weiteren Lehre der Erfindung ist Bindekomponente und/oder die Tränk- und/oder Beschichtungskomponente ein Kunstharz, Teer, Pech, Teer- oder Pechersatz oder ein According to a further teaching of the invention, the binding component and / or the impregnating and / or coating component is a synthetic resin, tar, pitch, tar or pitch substitute or a
sonstiges für feuerfeste Zwecke geeignetes other suitable for refractory purposes
kohlenstoffhaltiges Binde-, Tränk- oder Imprägniermittel. carbonaceous binding, impregnating or impregnating agent.
In weiterer Ausgestaltung der Erfindung können in dem In a further embodiment of the invention can in the
Feuerfestmaterial weitere kohlenstoffhaltige Refractory further carbonaceous
Feststoffkomponenten wie Ruß, Graphit, Harzpulver, Solid components such as carbon black, graphite, resin powder,
feingemahlene Kohle oder dergleichen enthalten sein. Eine weitere Lehre der Erfindung sieht vor, dass das containing finely ground coal or the like. Another teaching of the invention provides that the
Feuerfestmaterial vor dem Beschichten, Tränken oder Refractory before coating, watering or
Imprägnieren ein keramisch gebundenes gebranntes Impregnate a ceramically fired
Feuerfestmaterial ist. Dies ist besonders dann von Interesse, wenn das Feuerfestmaterial für Formkörper mit aufwändigeren Geometrien handelt. Refractory material is. This is of particular interest when the refractory material for moldings involves more complex geometries.
Nach dem Beschichten, Tränken oder Imprägnieren kann das Feuerfestmaterial einer geeigneten Temperaturbehandlung unterzogen werden. After coating, impregnating or impregnating, the refractory material may be subjected to a suitable temperature treatment.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass Feuerfestmaterial weitere nicht kohlenstoffhaltige A further embodiment of the invention provides that refractory material further non-carbonaceous
Bestandteile aufweist, wie beispielsweise Schamotte, Constituents, such as chamotte,
Andalusit, Sinterbauxit, Tabular, Tonerde, Schmelkorunde, Magnesia und ähnliche Füllstoffe. Andalusite, sintered bauxite, tabular, alumina, fused corundum, magnesia and similar fillers.
Mit dem erfindungsgemäßen Feuerfestmaterial lassen sich neben Rohr- und Kanalsteinen auch „besondere"" Formkörper With the refractory material according to the invention can be in addition to pipe and channel stones also "special" "moldings
herstellen, wie Einlauftrichter, König- oder Steigersteine. such as funnel, king or riser.
Bei stranggezogenen Formkörpern erfolgt nach einer weiteren Lehre der Erfindung das Beschichten und/oder Tränken stahl- oder allseitig, je nach spezifischem Einbauort und In extruded moldings is carried out according to a further teaching of the invention, the coating and / or impregnation steel or all sides, depending on the specific installation location and
gewünschter Standzeit. desired service life.
Die Erkenntnisse wurden in praktischen Versuchen in The findings were used in practical experiments
Stahlwerken erprobt und bestätigt. Dabei brachten Sorten mit Kohlenstoffbindung vergleichbare Ergebnisse wie keramisch gebundene und gebrannte Hohlware mit einseitiger Steel works tested and confirmed. In this case, varieties with carbon bond comparable results as ceramic bonded and fired hollowware with one-sided
(stahlseitiger) oder allseitiger Beschichtung und Tränkung mit kohlenstoffhaltigen Komponenten. Die Gefahr des Aufkohlens des Stahls („carbon pick up") wurde in den bisher untersuchten Fällen als vernachlässigbar beurteilt. (Steel-side) or all-round coating and impregnation with carbon-containing components. The danger of Carburizing the steel ("carbon pick-up") was judged to be negligible in the cases investigated so far.
Die Erfindung beruht hauptsächlich auf der Tatsache, dass kohlenstoffhaltige Bauteile im Stahlunterguss bisher nicht verwendet werden. Erfindungsgemäß ist erreicht worden, derartige Materialien für die Herstellung von Hohlware anzupassen und anzuwenden. Die Erfindung wird nachfolgend anhand einer lediglich ein schematisches Ausführungsbeispiel darstellenden Zeichnung näher erläutert. In der Zeichnung zeigen The invention is mainly based on the fact that carbonaceous components in the steel substructure have not yet been used. According to the invention has been achieved to adapt and apply such materials for the production of hollowware. The invention will be explained in more detail with reference to a drawing showing only a schematic embodiment. In the drawing show
Fig. 1 ein Gießsystem für den Stahlunterguss im Fig. 1 is a casting system for the steel substructure in
Vertikalschnitt,  Vertical section
Fig. 2 eine Gegenüberstellung von Gießknochen und Fig. 2 is a comparison of casting bones and
aufgetrennter Hohlware mit und ohne  separated hollowware with and without
Kohlenstoffeinsatz und  Carbon use and
Fig. 3 Schnitte von Gießknochen aus unterschiedlichen Fig. 3 sections of casting bone from different
Untergussgespannen .  Lower castles.
In Fig. 1 ist ein Untergussgespann 1 für Blockguss mit zwei Gießkokillen 2 , 3 dargestellt. Zwischen den Gießkokillen 2, 3 befindet sich ein Gießtrichter 4 mit einem Einlauftrichter 5, in den schmelzflüssige Stahlschmelze mittels einem nicht gezeigten Gießgefäß eingefüllt werden kann. Unterhalb des Einlauftrichters 5 befindet sich eine Mehrzahl von In Fig. 1, a lower casting 1 for block casting with two casting molds 2, 3 is shown. Between the casting molds 2, 3 is a sprue 4 with an inlet funnel 5, can be filled into the molten molten steel by means of a casting vessel, not shown. Below the inlet funnel 5 is a plurality of
Rohrsteinen 6. Unterhalb des untersten Rohrsteins 6 sorgt ein Rönigstein 7 für eine gleichmäßige Verteilung der nicht dargestellten Stahlschmelze in Richtung der Pfeile entlang von Kanalsteinen 8. Steigersteine 9 am Ende des Kanals sind so angeordnet, dass die nicht näher bezeichnete Öffnungen in der Mitte der darüber angeordneten Gießkokillen 2 bzw. 3 enden . Pipe Stones 6. Below the lowermost pipe block 6, a Rönigstein 7 ensures a uniform distribution of the molten steel, not shown, in the direction of the arrows 8. Steigersteine 9 at the end of the channel are arranged so that the unspecified openings in the middle of the overlying casting molds 2 and 3 ends.
Erfindungsgemäß bestehen sämtliche mit der flüssigen According to the invention, all with the liquid
Stahlschmelze in Kontakt tretenden Steine des Molten steel in contact with the stones
Untergussgespanns, nämlich Einlauftrichter 5, Rohrsteine 6, Königstein 7, Kanalsteine 8 und Steigersteine 9 aus einem feuerfesten Material, dass wenigstens stahlseitig Untergussgespanns, namely inlet funnel 5, pipe blocks 6, Königstein 7, channel stones 8 and risers 9 of a refractory material that at least steel side
kohlenstoffhaltige Komponenten enthält bzw. mit diesen contains carbonaceous components or with these
Komponenten gebunden ist und/oder beschichtet /getränkt ist. Durch den verwendeten Kohlenstoff in den dargestellten Components is bound and / or coated / impregnated. By the carbon used in the illustrated
Formkörpern 5 bis 9 werden diese nur geringfügig von der Stahlschmelze benetzt, so dass ein Mitreißen von Moldings 5 to 9, these are only slightly wetted by the molten steel, so that entrainment of
nichtmetallischen Ausbrüchen der Formkörper weitgehend äußert zuverlässig verhindert werden kann, wodurch sich die Non-metallic outbreaks of the moldings largely expressed reliably can be prevented, causing the
Stahlqualität deutlich verbessert. Auch wird die Steel quality significantly improved. Also, the
Wiederverwendung der Gießknochen deutlich erleichtert, da sie relativ glatte Oberflächen haben, die nicht mit Fremdkörpern behaftet sind. Reuse of the casting bones much easier, since they have relatively smooth surfaces that are not contaminated with foreign bodies.
In Fig. 2 ist ein Gießknochen 10 dargestellt, dessen linke Hälfte in einem Formstein ohne Kohlenstoff und die rechte Hälfte in einem erfindungsgemäßen Formkörper erstarrt ist. Man erkennt deutlich, dass der linke Bereich mit einer „Kruste" von nichtmetallischen Einschlüssen bedeckt ist. In Fig. 2, a casting bone 10 is shown, the left half is solidified in a molded block without carbon and the right half in a molding according to the invention. It can be seen clearly that the left area is covered with a "crust" of non-metallic inclusions.
Gleiches gilt für die Formkörper selbst, der im linken Teil dargestellte Teil eines Kanalsteins IIA ist deutlich stärker beansprucht als der rechts dargestellte Teil eines The same applies to the moldings themselves, the part of a channel block IIA shown in the left part is significantly more stressed than the part shown on the right
Kanalsteins IIB mit Kohlenstoff. Noch deutlicher wird dies in Fig. 3, wo vier Schnitte eines Stahlgießknochens verwendet werden, wobei die Schnitte 12A bis 12C von Gießknochen stammen, die in einem Kanalstein's IIB with carbon. This becomes even clearer in Fig. 3, where four sections of a Stahlgießknochens are used, wherein the cuts 12A to 12C originate from casting bones, which in a
kohlenstoffgebundenen Formkörper erkaltet sind und man am Schnitt 13 durch einen Gießknochen aus einem Formkörper ohne Kohlenstoff deutlich eine den Stahlkern umgebende Kruste 14 erkennt. Es ist klar, dass die Gießknochen 12A, 12B, 12C ohne nichtmetallische Ablagerungen deutlich besser carbon-bonded moldings are cooled and one recognizes the steel core core crust 14 at the section 13 by a casting bone from a shaped body without carbon clearly. It is clear that the casting bones 12A, 12B, 12C significantly better without non-metallic deposits
wiederverwendbar sind als ein Gießknochen 13 mit einer Kruste 14 aus nichtmetallischen Anbackungen, welche vor der are reusable as a casting bone 13 with a crust 14 of non-metallic caking, which before the
Wiederverwendung zunächst entfernt werden muss. Reuse must first be removed.

Claims

Patentansprüche claims
Feuerfestmaterial zur Auskleidung des Verteilungssystems einer Stahlschmelze beim Gießen von Stahl im Refractory material for lining the distribution system of molten steel when casting steel in steel
Unterguss erfahren, Undergo infusion,
d a d u r c h g e k e n n z e i c h n e t, d a s s das Feuerfestmaterial mindestens stahlseitig The fire-resistant material is at least steel-sided
kohlenstoffhaltige Komponenten enthält, mit diesen contains carbonaceous components with these
Komponenten gebunden ist und/oder beschichtet und/oder getränkt ist. Components is bound and / or coated and / or soaked.
Feuerfestmaterial nach Anspruch 1, in dem die Refractory material according to claim 1, in which the
Bindekomponente ein Kunstharz, Teer, Pech, Teer- oder Pechersatz oder ein sonstiges für feuerfeste Zwecke geeignetes kohlenstoffhaltiges Bindemittel ist. Binding component is a synthetic resin, tar, pitch, tar or pitch substitute or other suitable for fireproofing carbonaceous binder.
Feuerfestmaterial nach Anspruch 1 oder 2, in dem die Tränk- oder Beschichtungskomponente ein Kunstharz, Teer, Pech, Teer- oder Pechersatz oder ein sonstiges für feuerfeste Zwecke geeignetes kohlenstoffhaltiges Tränkoder Imprägniermittel ist. Refractory material according to claim 1 or 2, in which the impregnating or coating component is a synthetic resin, tar, pitch, tar or pitch substitute or any other carbonaceous impregnating agent or impregnating agent suitable for refractory purposes.
Feuerfestmaterial nach einem der Ansprüche 1 bis 3, in dem weitere kohlenstoffhaltige Feststoffkomponenten wie Ruß, Graphit, Harzpulver, feingemahlene Kohle usw. Refractory material according to one of claims 1 to 3, in which further carbonaceous solid components such as carbon black, graphite, resin powder, finely ground coal, etc.
enthalten sein können. may be included.
5. Feuerfestmaterial nach einem der Ansprüche 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, d a s s das Feuerfestmaterial vor dem Beschichten, Tränken oder Imprägnieren ein keramisch gebundenes gebranntes 5. The refractory material according to any one of claims 1 to 4, wherein the refractory material is a ceramically bonded burned prior to coating, impregnating or impregnating
Feuerfestmaterial ist.  Refractory material is.
6. Feuerfestmaterial nach einem der Ansprüche 1 bis 5, 6. Refractory material according to one of claims 1 to 5,
d a d u r c h g e k e n n z e i c h n e t, d a s s es einer geeigneten Temperaturbehandlung unterzogen wurde .  It was not subjected to any suitable heat treatment.
7. Feuerfestmaterial nach einem der Ansprüche 1 bis 6, 7. Refractory material according to one of claims 1 to 6,
d a d u r c h g e k e n n z e i c h n e t, d a s s die nicht kohlenstoffhaltigen Bestandteile übliche keramische Komponenten wie Schamotte, Andalusit,  the non-carbonaceous constituents of conventional ceramic components such as chamotte, andalusite,
Sinterbauxit, Tabular- Tonerde, Schmelzkorunde, Magnesia und ähnliche Füllstoffe sind.  Sintered bauxite, tabular alumina, fused corundum, magnesia and similar fillers.
8. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7, A molded article made of a refractory material according to any one of claims 1 to 7,
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper als Hohlware stranggezogen ist.  d a d u r c h e k e n e z e i n h e, e s s the molded article is extruded as hollowware.
9. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7, A molded article made of a refractory material according to any one of claims 1 to 7,
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper trockengepresst kohlenstoffgebunden ist.  The molded articles are dry-bonded carbon-bonded.
10. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7, A molded article made of a refractory material according to any one of claims 1 to 7,
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper als Einlauftrichter (5) ausgebildet ist. characterized in that the shaped body is designed as an inlet funnel (5).
11. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7 11 molded body made of a refractory material according to any one of claims 1 to 7
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper als Rohrstein (6) ausgebildet ist.  d a d u r c h g e k e n e z e i n h e, e s s of the shaped body is formed as a pipe block (6).
12. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7, 12. A molded article made of a refractory material according to any one of claims 1 to 7,
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper als Königstein (7) ausgebildet ist.  d a d u r c h g e k e n e z e i n h e, e s s of the moldings is designed as a Königstein (7).
13. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7, 13. A molded article made of a refractory material according to any one of claims 1 to 7,
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper als Kanalstein (8) ausgebildet ist.  d a d u r c h g e k e n e z e i c h e n e, t a s s of the shaped body is designed as a channel stone (8).
14. Formkörper, hergestellt aus einem Feuerfestmaterial nach einem der Ansprüche 1 bis 7, 14. A molded article made of a refractory material according to any one of claims 1 to 7,
d a d u r c h g e k e n n z e i c h n e t, d a s s der Formkörper als Steigerstein (9) ausgebildet ist.  d a d u r c h g e k e n e z e i h e s e, t a s s of the shaped body as a riser (9) is formed.
15. Formkörper nach Anspruch 8 und einem der Ansprüche 9 bis 14, 15. Shaped body according to claim 8 and one of claims 9 to 14,
d a d u r c h g e k e n n z e i c h n e t, d a s s das Beschichten und/oder Tränken stahl- oder allseitig erfolgt ist.  The coating and / or impregnation has been carried out on steel or on all sides.
PCT/EP2010/066743 2009-11-09 2010-11-03 Carbonaceous fireproof material for use when casting steel in a bottom casting process and formed parts produced thereof WO2011054872A1 (en)

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DE102009052279A DE102009052279A1 (en) 2009-11-09 2009-11-09 Carbon-containing refractory material for use in the casting of steel in the sub-casting process and moldings produced therefrom

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CN105149530A (en) * 2015-08-20 2015-12-16 攀钢集团西昌钢钒有限公司 Knotting method for ferrovanadium ingot mould
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