EP0341798B1 - Abstichstopfen für einen Stahlkonverter, um das Mitlaufen von Abstichschlacke zu vermeiden - Google Patents

Abstichstopfen für einen Stahlkonverter, um das Mitlaufen von Abstichschlacke zu vermeiden Download PDF

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Publication number
EP0341798B1
EP0341798B1 EP19890201175 EP89201175A EP0341798B1 EP 0341798 B1 EP0341798 B1 EP 0341798B1 EP 19890201175 EP19890201175 EP 19890201175 EP 89201175 A EP89201175 A EP 89201175A EP 0341798 B1 EP0341798 B1 EP 0341798B1
Authority
EP
European Patent Office
Prior art keywords
plug
tapping
steel
slag
faces
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
EP19890201175
Other languages
English (en)
French (fr)
Other versions
EP0341798A1 (de
Inventor
Jozef Gerard Maria Trentelman
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.)
Tata Steel Ijmuiden BV
Original Assignee
Hoogovens Groep BV
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 Hoogovens Groep BV filed Critical Hoogovens Groep BV
Publication of EP0341798A1 publication Critical patent/EP0341798A1/de
Application granted granted Critical
Publication of EP0341798B1 publication Critical patent/EP0341798B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof

Definitions

  • the invention relates to a plug of refractory material for use in a steel converter to minimize tapping off of slag from the converter, and also to a method of tapping a steel converter using such a plug.
  • the simplest method is to observe the flow of steel and to stop tapping at the first appearance of slag.
  • Another method is to use a spherical ball which is introduced into the converter before tapping.
  • the specific gravity of the ball is such that it floats on the steel but not on the slag.
  • the ball closes the opening of the tap hole of the converter.
  • a disadvantage of this method is that this closing frequently occurs so early that much steel still remains behind in the converter. This is undesirable.
  • plugs are used which are not spherical, but for example take the shape of a cube. This kind of plug does not close the tap hole completely. The remaining steel may still run out of the converter, but at a lower velocity. At the point when slag threatens to emerge, tapping off is stopped.
  • non-spherical plugs of this kind require very accurate positioning in the converter because they do not automatically find the tap hole at the end of tapping. This is because, in contrast to spherical plugs, their ability to roll is insufficient. As a result the closing of the tap hole is sometimes so poor that the flow of end slag is insufficiently counteracted.
  • improvement in the probability of achieving a good closing off is sought by providing them with a long shank which is introduced into the tap hole of the converter. This holds the plug at the desired place so that the probability of accurate positioning is equivalent to that of the spherical plug.
  • positioning the plug with a shank is considerably harder than positioning the spherical plug.
  • the object of the invention is to provide a plug which avoids the defects of the spherical plug and the cubic plugs described above, as well as those of the plugs with a shank.
  • the plug of the invention given is claim 1 is of the shankless type and has a polyhedral shape with a plurality of generally flat faces. Each face joins at least one adjacent face at an obtuse angle. In some embodiments at least one end point of each intersecting line of two adjacent faces lies on an imaginary sphere enveloping the plug.
  • This plug does not close the tap hole completely so that towards the end of tapping the flow of steel is reduced but not completely blocked. Moreover, this plug has sufficient ability to roll so that it does not need to be provided with a shank for positioning at the tap hole.
  • a preferred shape of the plug is one in which it has symmetrical upper and lower halves meeting at a common plane which has a larger area than any parallel sections of the upper and lower halves.
  • the plug then fits releasably in the mould in which it is cast and can be removed from it without its shape being lost. In view of the large number of plugs needed in practice (per converter charge one plug is consumed), this represents an important cost advantage.
  • a simple embodiment has been found to be a plug of which the common plane between the lower and upper halves has essentially a rectangular e.g. square shape. It is particularly desirable that the plug has a top plane and a base plane which are parallel to the said common plane of the lower and upper halves.
  • the plugs shown in Figs. 1 and 2 consist essentially of refractory material of appropriate density to float at the steel slag interface. This may be for example a suitable type of refractory concrete.
  • Fig. 1 shows an embodiment in which the plug has fourteen flat faces, of which six large faces 5 intersect each other at 90° and eight small triangular faces 6 form bevels at the corners. There are thus twenty four angles, each angle being the meeting point for three intersecting meeting lines of the faces. For example angle 1 is formed by the intersecting lines 2, 3 and 4.
  • the plug may be lifted or tipped into a converter using an eye 7.
  • Each of the faces 6 intersects each of the three adjacent larger faces 5 at an obtuse angle.
  • the shape of the plug enables it to roll easily to lodge in the taphole of the steel converter.
  • Fig. 2 shows a further improved plug with edges bevelled off more.
  • the shape of this plug reduces the risk of the angles crumbling away and improves its ability to roll.
  • the plug is a body of polyhedral shape having a rectangular central plane of symmetry 10 and mutually symmetrical upper and lower halves 8, 9 on each side of this central plane.
  • Each half 8, 9 has four large planar faces 8a, 9a meeting the central plane of symmetry 10 and extending away from it at an angle less than 90°, specifically 75° and a planar end face 11, 12 meeting all the first planar faces 8a, 9a and lying parallel to the central plane of symmetry 10.
  • There are rounded surfaces 14 at meeting zones of each adjacent pair of the first planar faces 8a, 9a.
  • Both the lower half 8 and the upper half 9 have a tapering shape. This has the advantage that the mould or die which is used for making the plug may be re-used. This reduces the production costs of the plug to a significant degree.
  • the plugs illustrated are each 205 mm high and have maximum widths of 205 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Claims (7)

1. Ein Abstichstopfen aus Feuerfestmaterial für einen Stahlkonverter zum Minimieren des Mitabziehens von Schlacke, welcher Abstichstopfen eine polyedrische Gestalt besitzt und schaftlos ist, dadurch gekennzeichnet, daß die Stopfenoberfläche aus einer Vielzahl von allgemein ebenen Flächen (5, 6; 8a, 9a, 11, 12, 13) besteht, welche in entsprechenden Ebenen liegen, wobei sich die Ebenen Jedes benachbarten Flächenpaares unter einem Winkel von nicht unter 90° schneiden und die Ebene jeder Fläche die Ebene von zumindest einer benachbarten Fläche unter einem Winkel größer als 90° schneidet.
2. Ein Abstichstopfen gemäß Anspruch 1, wobei sich die Ebenen jedes benachbarten Flächenpaares unter einem Winkel größer als 90° schneiden.
3. Ein Abstichstopfen gemäß Anspruch 1 oder Anspruch 2 mit gegenseitig symmetrischer oberer und unterer Hälfte (8, 9), welche sich in einer gemeinsamen Ebene treffen, welche eine größere Fläche besitzt, als irgendein Schnitt der oberen und unteren Hälfte parallel zu ihr.
4. Ein Abstichstopfen gemäß Anspruch 3, wobei die der oberen und der unteren Hälfte (8, 9) gemeinsame Ebene (10) eine im wesentlichen rechteckige Form hat.
5. Ein Abstichstopfen gemäß Anspruch 3 oder Anspruch 4 mit einer oberen Fläche (11) und einer unteren Fläche (12), die beide parallel zu der gemeinsamen Ebene liegen.
6. Ein Abstichstopfen gemäß irgendeinem der Ansprüche 3 bis 5, wobei zumindest einige der zusammentreffenden Zonen (14) benachbarter Flächen gerundet sind.
7. Ein Verfahren zum Abstechen eines Stahlkonverters mit den Schritten (i) Anordnen eines Abstichstopfens gemäß irgendeinem der Ansprüche 1 bis 6 in das Schmelzbad im Konverter, wobei der Abstichstopfen eine solche Dichte hat, daß er an der Grenzfläche von Stahl und Schlacke schwimmt und (ii) Abstechen des Stahles vom Schmelzofen über ein Abstichloch in der Art, daß sich der Abstichstopfen im Abstichloch festsetzt.
EP19890201175 1988-05-11 1989-05-09 Abstichstopfen für einen Stahlkonverter, um das Mitlaufen von Abstichschlacke zu vermeiden Expired EP0341798B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8801231A NL8801231A (nl) 1988-05-11 1988-05-11 Stop voor een staalconverter.
NL8801231 1988-05-11

Publications (2)

Publication Number Publication Date
EP0341798A1 EP0341798A1 (de) 1989-11-15
EP0341798B1 true EP0341798B1 (de) 1992-01-02

Family

ID=19852290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890201175 Expired EP0341798B1 (de) 1988-05-11 1989-05-09 Abstichstopfen für einen Stahlkonverter, um das Mitlaufen von Abstichschlacke zu vermeiden

Country Status (5)

Country Link
EP (1) EP0341798B1 (de)
CA (1) CA1315100C (de)
DE (1) DE68900631D1 (de)
ES (1) ES2029113T3 (de)
NL (1) NL8801231A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2148656C1 (ru) * 1998-12-08 2000-05-10 АО "Новолипецкий металлургический комбинат" Стопор для отсечки шлака в конвертере

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1218846A (en) * 1982-05-10 1987-03-10 James G. Bassett, Jr. Method of minimizing slag carryover
DE8317252U1 (de) * 1983-06-13 1983-11-24 Thyssen Stahl AG, 4100 Duisburg Verschlussorgan zum zurueckhalten der schlacke waehrend des abstiches aus einem konverter

Also Published As

Publication number Publication date
DE68900631D1 (de) 1992-02-13
CA1315100C (en) 1993-03-30
ES2029113T3 (es) 1992-07-16
EP0341798A1 (de) 1989-11-15
NL8801231A (nl) 1989-12-01

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