EP0043160B2 - Giesseinrichtungen für geschmolzene Materialien - Google Patents

Giesseinrichtungen für geschmolzene Materialien Download PDF

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Publication number
EP0043160B2
EP0043160B2 EP19810200701 EP81200701A EP0043160B2 EP 0043160 B2 EP0043160 B2 EP 0043160B2 EP 19810200701 EP19810200701 EP 19810200701 EP 81200701 A EP81200701 A EP 81200701A EP 0043160 B2 EP0043160 B2 EP 0043160B2
Authority
EP
European Patent Office
Prior art keywords
weight
refractory concrete
alumina
binder
degradable
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
Application number
EP19810200701
Other languages
English (en)
French (fr)
Other versions
EP0043160A1 (de
EP0043160B1 (de
Inventor
Henri Jacobs
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre SA
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Filing date
Publication date
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Priority claimed from BE5/5215A external-priority patent/BE884080A/fr
Application filed by Cockerill Sambre SA filed Critical Cockerill Sambre SA
Priority to AT81200701T priority Critical patent/ATE11382T1/de
Publication of EP0043160A1 publication Critical patent/EP0043160A1/de
Application granted granted Critical
Publication of EP0043160B1 publication Critical patent/EP0043160B1/de
Publication of EP0043160B2 publication Critical patent/EP0043160B2/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates therefor
    • B22D41/30—Manufacturing or repairing thereof
    • B22D41/32—Manufacturing or repairing thereof characterised by the materials used therefor

Definitions

  • the present invention relates to a nozzle for casting molten material more particularly suitable for liquid steel.
  • pouring devices equipping in particular the steelworks pouring ladles, emptying from the bottom. These devices allow the complete flow of the steel contained in the pocket.
  • the pouring equipment for these pockets can take various forms. It can in particular be of the conventional cattail type or of the sliding plate type.
  • the casting equipment for a steelworks pocket consists of at least one internal nozzle, one external nozzle and a system, located between the two nozzles. , to adjust or interrupt the flow of molten material.
  • the internal nozzle sometimes called the collecting nozzle, is inserted into a seat brick, which is part of the casting equipment, and is itself housed in the refractory lining of the bag.
  • the external nozzle which is sometimes called a regulating nozzle, is located under the pocket in the extension of the collecting nozzle; it is used in particular to calibrate and center the casting jet.
  • a system of flat or cylindrical sliding plates Between the two nozzles is disposed a system of flat or cylindrical sliding plates, ensuring the adjustment of the flow rate of the molten material, in particular the speed of casting.
  • the various constituent elements of the casting equipment are provided with a mold, for example a metal casing, which ensures correct shaping of the refractory materials required for their manufacture and which gives them a certain resistance to stresses. mechanical.
  • baked refractory materials have often been used for the manufacture of the constituent elements of casting equipment, the cost of which was obviously conditioned by their quality.
  • the nozzles are subjected, during the casting of molten metal, to severe erosion, so that their lifetime is extremely short and rarely exceeds a casting operation.
  • the section of the flow channel becomes irregular, the jet of molten metal is disturbed and pouring is difficult. It is therefore necessary to replace the nozzles often, which leads to disassembly and reassembly costs, to which is added the price of the equipment itself.
  • DE-C 1 250 607 describes a pouring nozzle according to the preamble of claim 1 which ensures a substantially constant flow rate, despite the decrease in the static pressure of the molten steel contained in the ladle, at as this pocket becomes empty.
  • This nozzle contains several parts made of differently degradable materials, the part located towards the outlet being the least degradable while the part located near the ladle is the most degradable. Building a nozzle with several parts is complicated. To avoid this drawback, the present invention provides a simpler construction nozzle which nevertheless keeps the substantially constant flow rate of the known nozzle (DE-C 1250607)
  • the present invention relates to a nozzle for casting molten material more particularly suitable for liquid steel, this nozzle comprising at least one part of an uncooked and uncompressed refractory concrete, consisting (1) of an aggregate or aggregate of particles containing more than 99% by weight of alumina having undergone a prior heat treatment up to the melting or sintering temperature and (2) of a binder formed from approximately 75 to 85% by weight of alumina, the remainder of the binder being essentially calcium oxide, this binder having undergone a prior heat treatment up to the melting temperature, said refractory concrete part being covered with a layer of degradable refractory concrete capable of undergoing progressive erosion due to the contact of the molten materials during their casting, so that this casting takes place at a substantially constant flow rate.
  • the degradable concrete layer of the nozzle according to the present invention advantageously consists of a refractory concrete of the silico-aluminous type having an alumina content of approximately 45 to 65%, preferably approximately 47 to 50% by weight.
  • degradable concrete a refractory concrete containing about 55 to 60% by weight of alumina and titanium dioxide.
  • the iron oxide (Fe 2 0 3 ) content of these degradable concretes may not exceed 0.6%.
  • the aggregate of degradable refractory concrete advantageously has an alumina content of approximately 45 to 65% by weight, the rest being mainly composed of silica.
  • the binder with hydraulic setting of this concrete it is of the silico-aluminous type containing approximately 25 to 40% by weight of calcium oxide.
  • the degradable refractory concrete parts can be molded in situ in refractory concrete nozzles with a very high alumina content.
  • the Applicant has found that the layer of degradable refractory concrete adheres perfectly to the part of the very high grade nozzle in alumina which surrounds it and that this part undergoes homogeneous wear on its contact surface with the molten metal.
  • composition of neutral refractory concrete Composition of neutral refractory concrete:
  • the mixture of aggregate and binder in the above-mentioned proportions is added with a dispersing and stabilizing agent consisting of sodium pyrophosphate or sodium carbonate in an amount of approximately 0.2% relative to the binder.
  • a dispersing and stabilizing agent consisting of sodium pyrophosphate or sodium carbonate in an amount of approximately 0.2% relative to the binder.
  • Refractory concrete parts are obtained by spoiling the mixture of aggregate and refractory binder with a minimum amount of water in a mold. Before the hydraulic setting of the binder, the mixture is packed, compacted or vibrated.
  • composition of degradable refractory concrete Composition of degradable refractory concrete:
  • the mixture of aggregate and binder mixed with a minimum of water is molded in situ in the interior part of a nozzle made of refractory concrete of the type described in Example 1.
  • the Applicant has found that by using refractory concrete nozzles, according to Example 1, internally lined with a layer of degradable refractory concrete according to Example 2, there is no breakthrough or cracking of the nozzles after several castings despite the gradual erosion of the inner layer of degradable refractory concrete.
  • the internal diameter of the nozzle which was 42 mm before casting, reached a value of 71 mm at the end of this casting.
  • This gradual increase in the internal diameter of the nozzles made it possible to maintain a substantially constant flow rate in spite of the decrease in the static pressure of the continuous molten steel in the ladle.
  • the present invention preferably relates to the casting of ladle steel, it is not limited to this single object; it also relates to the casting of other melting materials in the liquid state, for example non-ferrous materials, glass and the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Products (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Claims (7)

1. Ausguss für Schmelzmaterial, insbesondere für flüssigen Stahl, dadurch gekennzeichnet, dass er zumindest zum Teil aus einem nicht gebrannten und nicht gestampften Beton besteht, welcher aus (1) einem Teilchengranulat oder -aggregat mit einem Gehalt von mehr als 99 Gew.-% Tonerde, welche einer vorherigen Wärmebehandlung bis zur Schmelz- oder Sintertemperature unterworfen worden ist, und (2) einem Bindemittel, welches aus etwa 75 bis 85 Gew.-% Tonerde besteht und der Rest des Bindemittels im wesentlichen Calciumoxid ist und dieses Bindemittel einer vorherigen Wärmebehandlung bis zur Schmelztemperatur unterzogen wurde, wobei der genannte Teil mit einer Schicht aus verschleissbarem feuerfestem Beton überzogen ist, der auf Grund des Kontaktes mit dem Schmelzgut beim Abgiessen eine progressive Erosion durchmachen kann.
2. Ausguss nach Anspruch 1, dadurch gekennzeichnet, dass der verschleissbare feuerfeste Beton als Aggregate eine bei einer Temperatur zwischen 800 und 1100°C vorbehandelte weiche Schamotte enthält.
3. Ausguss nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass der verschleissbare feuerfeste Beton vom Silicoaluminat-Typ, bestehend aus etwa 45 bis 65 Gew.-% Tonerde, ist.
4. Ausguss nach Anspruch 3, dadurch gekennzeichnet, dass der Gehalt des verschleissbaren feuerfesten Betons an Tonerde etwa 47 bis 50 Gew.-% der Trockenmischung beträgt.
5. Ausguss nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der verschleissbare feuerfeste Beton ein Aggregat enthält, dessen Gehalt an Tonerde etwa 45 bis 65 Gew.-% Tonerde ausmacht, wobei der Rest vorwiegend aus Kieselerde besteht.
6. Ausguss nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der verschleissbare feuerfeste Beton ein hydraulisch abbindendes Bindemittel des Silicoaluminat-Typs mit einem Gehalt von etwa 25 bis 40 Gew.-% Calciumoxid enthält.
7. Ausguss nach einem der Ansprüche 3 und 4, dadurch gekennzeichnet, dass der verschleissbare feuerfeste Beton etwa 85 Gew.-% Aggregat und etwa 15 Gew.-% Bindemittel enthält.
EP19810200701 1980-06-27 1981-06-22 Giesseinrichtungen für geschmolzene Materialien Expired EP0043160B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81200701T ATE11382T1 (de) 1980-06-27 1981-06-22 Giesseinrichtungen fuer geschmolzene materialien.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BE5/5215A BE884080A (fr) 1980-06-27 1980-06-27 Perfectionnement aux equipements de coulee de matiere en fusion et a leur procede de fabrication.
BE55215 1980-06-27
BE203293 1980-12-23
BE203293 1980-12-23

Publications (3)

Publication Number Publication Date
EP0043160A1 EP0043160A1 (de) 1982-01-06
EP0043160B1 EP0043160B1 (de) 1985-01-23
EP0043160B2 true EP0043160B2 (de) 1989-07-05

Family

ID=25652381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810200701 Expired EP0043160B2 (de) 1980-06-27 1981-06-22 Giesseinrichtungen für geschmolzene Materialien

Country Status (2)

Country Link
EP (1) EP0043160B2 (de)
DE (1) DE3168457D1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841539A (en) * 1973-03-01 1974-10-15 United States Steel Corp Collector nozzle for slidable gates
ZA763385B (en) * 1976-05-31 1977-05-25 Den Speulhof P Van A hydraulically setting high-alumina refractory concrete
GB1593371A (en) * 1976-06-25 1981-07-15 Didier Werke Ag Refractory structures
ATA743878A (de) * 1977-10-17 1987-06-15 Gen Refractories Co Verfahren zur herstellung einer schieberplatte fuer einen schieberverschluss fuer geschmolzene materialien
DE2718701C3 (de) * 1977-04-27 1988-05-26 Didier-Werke Ag, 6200 Wiesbaden Selbsttragende Schieberplatte
CS199377B1 (en) * 1977-05-13 1980-07-31 Valter Boehm Connecting method of at least two ceramic materials
DE2732094A1 (de) * 1977-07-15 1979-01-18 Didier Werke Ag Schiebeverschluss fuer metallschmelze enthaltende gefaesse
GB2065278B (en) * 1979-12-14 1983-10-12 Flogates Ltd Composite moulded refractory articles amd their manufacture

Also Published As

Publication number Publication date
EP0043160A1 (de) 1982-01-06
EP0043160B1 (de) 1985-01-23
DE3168457D1 (en) 1985-03-07

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