DE3727619C1 - Covering composition for vessels containing molten steel - Google Patents

Covering composition for vessels containing molten steel

Info

Publication number
DE3727619C1
DE3727619C1 DE19873727619 DE3727619A DE3727619C1 DE 3727619 C1 DE3727619 C1 DE 3727619C1 DE 19873727619 DE19873727619 DE 19873727619 DE 3727619 A DE3727619 A DE 3727619A DE 3727619 C1 DE3727619 C1 DE 3727619C1
Authority
DE
Germany
Prior art keywords
steel
melt
pellets
slag
magnesite
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
DE19873727619
Other languages
German (de)
Inventor
Klaus Dr-Ing Hagenburger
Dr-Ing Rosenstock Hans Georg
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.)
HAGENBURGER FEUERFESTE PRODUKTE FUER GIESSEREIEN U
Original Assignee
HAGENBURGER CHAMOTTE TON
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HAGENBURGER CHAMOTTE TON filed Critical HAGENBURGER CHAMOTTE TON
Priority to DE19873727619 priority Critical patent/DE3727619C1/en
Application granted granted Critical
Publication of DE3727619C1 publication Critical patent/DE3727619C1/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing

Abstract

The commercially available covering compositions for purifying and thermally insulating steel melts are not optimised in their consumption, their handling and their action. The new covering means is intended to make it possible to reduce consumption, simplify addition to the melt and improve precipitation conditions for the inclusions in the steel and the thermal insulation of the melt. The solution of the object consists in that ground magnesite is pelletised into porous balls and the green pellets are coated with a suitable slag layer. When the pellets are applied to the pool of steel, the slag coating melts away and forms on the steel melt a liquid slag layer which reacts with the melt, while the magnesite pellets are preserved and provide very good thermal insulation.

Description

Die Abdeckmassen auf flüssigem Stahl in Pfannen, Verteilern, Kokillen, Gießformen etc. sollen dafür sorgen, daß die Wärmeabstrahlung des flüssigen Stahles über den Badspiegel möglichst gering bleibt und Reaktionen zwischen der aufgeschmolzenen Schlacke der Abdeckmassen einerseits und dem Stahl sowie den nichtmetallischen Verbindungen im Stahl, wie Desoxydations- und Entschwefelungsprodukte, andererseits zur Verbesserung des makroskopischen Reinheitsgrades der Stahlschmelze unterstützt werden.The masking compounds on liquid steel in pans, Distributors, molds, molds, etc. should do this ensure that the heat radiation of the liquid steel remains as low as possible via the bathroom mirror and Reactions between the melted slag Masking compounds on the one hand and the steel and the non-metallic compounds in steel, such as Deoxidation and desulfurization products, on the other hand to improve the macroscopic degree of purity the molten steel are supported.

Es ist bekannt, zur Erfüllung dieser Erfordernisse pulvrige Abdeckmassen auf das Stahlbad aufzubringen. Dabei wird erwartet, daß die Abdeckmasse nicht vollständig aufschmilzt, sondern daß sich lediglich eine flüssige Grenzschicht auf dem Stahlbad bildet, die nach oben aufsteigende nichtmetallische Einschlüsse aufnimmt, während der Rest der Abdeckmasse pulverförmig bleibt und die Badoberfläche vor Wärmeabstrahlung schützt.It is known to meet these needs apply powdery masking compounds to the steel bath. It is expected that the masking compound will not completely melts, but that only forms a liquid boundary layer on the steel bath, the ascending non-metallic inclusions picks up while the rest of the masking material is powdered remains and the bathroom surface from heat radiation protects.

Abdeckmassen für Stahlschmelzen, die diesen Anforderungen genügen, sind z. Z. nicht auf dem Markt. Masking compounds for molten steel containing this Sufficient requirements are z. Currently not on the market.  

Man behilft sich dadurch, daß die pulvrige Abdeckmasse in kaltem Zustand periodisch auf das Stahlbad gegeben wird, um ein völliges Aufschmelzen zu verhindern und noch eine Wärmeisolationswirkung zu erreichen. Diese Handhabung ist umständlich, aufwendig und nicht wirtschaftlich.One helps one by the fact that the powdery Covering compound in cold condition periodically on the Steel bath is given to complete melting to prevent and still have a heat insulation effect to reach. This handling is cumbersome complex and not economical.

Der Erfindung liegt die Aufgabe zugrunde, die Vielzahl der Verfahrensschritte zum Aufbringen der Abdeckmasse zu reduzieren und zu vereinfachen, den Verbrauch von Abdeckmassen einzuschränken und für eine optimale Wärmeisolation des Stahlbades zu sorgen unter Beibehaltung der Reinigungsfunktion der Schlacke.The invention is based, which Variety of process steps for applying the To reduce and simplify the masking compound Limit consumption of masking compounds and for one to ensure optimal thermal insulation of the steel bath Maintaining the cleaning function of the slag.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Abdeckmasse aus Kügelchen besteht, die einen Kern aus pelletiertem Magnesitpulver und einen Überzug haben, und daß der Überzug aus Schlacke besteht, deren wesentliche Bestandteile Kalk und Tonerde sind.According to the invention, this object is achieved by that the masking compound consists of beads that one Pelletized magnesite powder core and coating and that the coating is made of slag, the main components of which are lime and alumina are.

Zweckmäßigerweise ist nach der Erfindung der Schlackenüberzug auf den Typ der Stahlschmelze abgestimmt.Advantageously, according to the invention Slag coating on the type of molten steel Voted.

Das erfindungsgemäße Verfahren zum Herstellen der Abdeckmasse besteht darin, daß aufgemahlener Magnesit mit einem engen Kornband so pelletiert wird, daß die Pellets Hohlräume enthalten und die so hergestellten Pellets mit einer flüssigen Schlacke benetzt werden.The inventive method for producing the Masking compound is that ground magnesite  pelletized with a narrow grain belt that the pellets contain voids and so produced pellets with a liquid Slag can be wetted.

Der Schlackenüberzug solcher als Abdeckmasse dienender Pellets schmilzt nach der Aufgabe auf das Stahlbad und bildet eine flüssige, reaktionsfähige Schlackenschicht auf der Stahlschmelze. Die Magnesitpellets, die einen Durchmesser von beispielsweise 5 bis 7 mm haben, bleiben erhalten und stellen einen sehr guten Wärmeabstrahlungsschutz für die Schmelze dar.The slag coating serves as a covering Pellets melt on the steel bath after the feed and forms a fluid, responsive Slag layer on the molten steel. The Magnesite pellets that have a diameter of, for example Have 5 to 7 mm, remain and make one very good heat radiation protection for the melt represents.

Die chemische Zusammensetzung des Schlackenüberzugs ist nach der Erfindung auf die Zusammensetzung der Stahlschmelze abzustimmen, um dadurch eine Verbesserung der Abscheidungsbedingungen der Einschlüsse in der Schmelze zu erreichen.The chemical composition of the slag coating is according to the invention on the composition of the Steel melt to tune, thereby making an improvement the deposition conditions of the inclusions in the To achieve melt.

Der Schlackenüberzug kann beispielsweise aus zwei oder mehreren der folgenden Komponenten zusammengesetzt sein:The slag coating can for example consist of two or composed of several of the following components be:

MgO:0 bis 90% CaO:0 bis 90% SiO₂:0 bis 95% Na₂O:0 bis 40% K₂O:0 bis 40% CaF₂:0 bis 40% LiO₂:0 bis 40% Al₂O₃:0 bis 50% C:0 bis 10%.MgO: 0 to 90% CaO: 0 to 90% SiO₂: 0 to 95% Na₂O: 0 to 40% K₂O: 0 to 40% CaF₂: 0 to 40% LiO₂: 0 to 40% Al₂O₃: 0 to 50% C: 0 to 10%.

Bei C- bzw. Si-beruhigten Stählen beträgt der SiO₂-Gehalt des Schlackenüberzugs vorzugsweise 90%.With C- or Si-calmed steels, the SiO₂ content is of the slag coating preferably 90%.

Bei Al- bzw. Al+C-beruhigten Stählen kommen vorzugsweise die folgenden Komponenten für den Schlackenüberzug in Frage:For Al- or Al + C-calmed steels are preferred the following components for the slag coating in question:

CaO:5-60% MgO:5-60% SiO₂:10-50% Na₂O:5-40% CaF₂:5-40% LiO₂:5-40% Al₂O₃:0-50%.CaO: 5-60% MgO: 5-60% SiO₂: 10-50% Na₂O: 5-40% CaF₂: 5-40% LiO₂: 5-40% Al₂O₃: 0-50%.

Die Vorteile der neuen Abdeckmasse sind:The advantages of the new masking compound are:

  • - Wirtschaftlicherer Verbrauch gegenüber den bekannten Produkten, da infolge gezielter Zugaben kleinere Mengen (kg/t Stahl) erforderlich sind.- More economical consumption compared the known products, as a result of targeted additions smaller quantities (kg / t steel) are required.
  • - Leichtere Handhabung bei der Zugabe der Abdeckmasse, weil eine einmalige Zugabe auf das Stahlbad ausreicht.- Easier handling when adding the Masking compound because a single addition to the Steel bath is sufficient.
  • - Bessere Eignung für die Pfannenmetallurgie und Stranggießtechnik, da durch die Trennung von Schlacke und Pellets gleichzeitig Reaktionen zwischen flüssiger Schlacke und Schmelze und sehr gute Temperaturabschirmung möglich sind.- Better suitability for ladle metallurgy and continuous casting technology because of the separation of slag and pellets reactions at the same time between liquid slag and melt and very good temperature shielding is possible.

Claims (3)

1. Abdeckmasse für flüssigen Stahl enthaltende Gefäße, dadurch gekennzeichnet, daß die Abdeckmasse aus Kügelchen besteht, die einen Kern aus pelletiertem Magnesitpulver und einen Überzug haben, und daß der Überzug aus Schlacke besteht, deren wesentliche Bestandteile Kalk und Tonerde sind.1. Masking compound for vessels containing liquid steel, characterized in that the masking compound consists of beads which have a core of pelletized magnesite powder and a coating, and that the coating consists of slag, the essential components of which are lime and alumina. 2. Abdeckmasse nach Anspruch 1, dadurch gekennzeichnet, daß der Überzug auf den Typ der Stahlschmelze abgestimmt ist.2. Masking compound according to claim 1, characterized characterized that the coating on the type of Steel melt is matched. 3. Verfahren zum Herstellen der Abdeckmasse nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß aufgemahlener Magnesit mit einem engen Kornband so pelletiert wird, daß die Pellets Hohlräume enthalten und die so hergestellten Pellets mit einer flüssigen Schlacke benetzt werden.3. Method of making the masking compound after Claim 1 or 2, characterized in that ground magnesite with a narrow Grain belt is pelleted so that the pellets Contain voids and the so produced Pellet wetted with a liquid slag will.
DE19873727619 1987-08-19 1987-08-19 Covering composition for vessels containing molten steel Expired DE3727619C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873727619 DE3727619C1 (en) 1987-08-19 1987-08-19 Covering composition for vessels containing molten steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873727619 DE3727619C1 (en) 1987-08-19 1987-08-19 Covering composition for vessels containing molten steel

Publications (1)

Publication Number Publication Date
DE3727619C1 true DE3727619C1 (en) 1988-11-24

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Family Applications (1)

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DE19873727619 Expired DE3727619C1 (en) 1987-08-19 1987-08-19 Covering composition for vessels containing molten steel

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DE (1) DE3727619C1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9010129U1 (en) * 1990-07-04 1990-09-20 Foseco International Ltd., Birmingham, Gb
DE4215169A1 (en) * 1992-05-08 1993-11-11 Veitscher Magnesitwerke Ag Protective non-sintering cover for smelting process - consists of caustic magnesia plus additive in pelletised or granular form, giving good thermal isolation from and protection against oxidn. to the molten metal e.g. steel
EP0899041A1 (en) * 1997-08-26 1999-03-03 Sumitomo Metal Industries Limited Mold powder for continuous casting and method of continuous casting using this powder
WO2002020853A1 (en) * 2000-09-11 2002-03-14 Paolo Giuseppe Comini Process to provide concurrently both energy and heat insulation for the liquid metal bath
WO2004054742A1 (en) * 2002-12-18 2004-07-01 Refratechnik Holding Gmbh Covering means for a top slag, method for the production thereof and use of the covering means
US7632770B2 (en) 2002-12-19 2009-12-15 Refratechnik Holding Gmbh Industrial ceramic shaped body and process for producing same
RU2533894C1 (en) * 2013-07-19 2014-11-27 Общество С Ограниченной Ответственностью "Группа "Магнезит" Method of steel processing in intermediate ladle
RU2639187C1 (en) * 2016-08-09 2017-12-20 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Heat-insulating slag-forming mixture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LUEGER: Lexikon der Technik, Bd. 5, 1963, DVA, S. 386, 460, 461, 548-553 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9010129U1 (en) * 1990-07-04 1990-09-20 Foseco International Ltd., Birmingham, Gb
DE4215169A1 (en) * 1992-05-08 1993-11-11 Veitscher Magnesitwerke Ag Protective non-sintering cover for smelting process - consists of caustic magnesia plus additive in pelletised or granular form, giving good thermal isolation from and protection against oxidn. to the molten metal e.g. steel
EP0899041A1 (en) * 1997-08-26 1999-03-03 Sumitomo Metal Industries Limited Mold powder for continuous casting and method of continuous casting using this powder
CN1067612C (en) * 1997-08-26 2001-06-27 住友金属工业株式会社 Mould pressing powder for continuous casting and continuous casting method
WO2002020853A1 (en) * 2000-09-11 2002-03-14 Paolo Giuseppe Comini Process to provide concurrently both energy and heat insulation for the liquid metal bath
WO2004054742A1 (en) * 2002-12-18 2004-07-01 Refratechnik Holding Gmbh Covering means for a top slag, method for the production thereof and use of the covering means
CN100398230C (en) * 2002-12-18 2008-07-02 耐火材料控股有限公司 Covering means for a top slag, method for the production thereof and use of the covering means
US7594948B2 (en) 2002-12-18 2009-09-29 Refratechnik Holding Gmbh Covering means for a top slag, method for the production thereof and use of the covering means
US7632770B2 (en) 2002-12-19 2009-12-15 Refratechnik Holding Gmbh Industrial ceramic shaped body and process for producing same
RU2533894C1 (en) * 2013-07-19 2014-11-27 Общество С Ограниченной Ответственностью "Группа "Магнезит" Method of steel processing in intermediate ladle
RU2639187C1 (en) * 2016-08-09 2017-12-20 Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский политехнический университет" Heat-insulating slag-forming mixture

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D1 Grant (no unexamined application published) patent law 81
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Owner name: HAGENBURGER FEUERFESTE PRODUKTE FUER GIESSEREIEN U

8339 Ceased/non-payment of the annual fee