EP0069613A1 - Product support for a siderurgical furnace - Google Patents

Product support for a siderurgical furnace Download PDF

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Publication number
EP0069613A1
EP0069613A1 EP82401072A EP82401072A EP0069613A1 EP 0069613 A1 EP0069613 A1 EP 0069613A1 EP 82401072 A EP82401072 A EP 82401072A EP 82401072 A EP82401072 A EP 82401072A EP 0069613 A1 EP0069613 A1 EP 0069613A1
Authority
EP
European Patent Office
Prior art keywords
height
envelope
support according
stud
furnace
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.)
Granted
Application number
EP82401072A
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German (de)
French (fr)
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EP0069613B1 (en
Inventor
Michel Henri Camille Denis
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.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
Fives Stein SA
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 Stein Heurtey SA, Fives Stein SA filed Critical Stein Heurtey SA
Publication of EP0069613A1 publication Critical patent/EP0069613A1/en
Application granted granted Critical
Publication of EP0069613B1 publication Critical patent/EP0069613B1/en
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
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids
    • F27D3/024—Details of skids, e.g. riders
    • 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
    • F27D5/00—Supports, screens, or the like for the charge within the furnace

Definitions

  • the products in particular steel slabs, which are heated before rolling in ovens, are supported on sleepers (or chenets) cooled by water or steam circulation, by means of supports called studs or buttons.
  • These studs are, in general, cylindrical in shape and placed on the chenet tubes at regular intervals and maintained by welding on the tube. They are coated, over part of their height by the insulating refractory lining which surrounds the chenet.
  • Moving the slab away from the chenet tube has another consequence which is the reduction of the shadow effect of the chenet on the slab.
  • the heat which is transmitted to the slab in the oven is essentially by radiation and the proximity of a cooled tube even insulated by a refractory lining, prevents radiation from the oven on the product. This results in a strip at a lower temperature on the product, which represents the trace of chenet and which is often called a black trace.
  • the interval between the chenet and the slab is determined by the height of the stud. However, it is difficult to greatly increase this height.
  • the part of the stud that emerges from the refractory lining receives radiation from the oven and its temperature increases rapidly with height.
  • the present invention relates to a pad or product support in a steel furnace which can have a support height as large as necessary, without reaching a prohibitive temperature.
  • This support is characterized in that it comprises over a significant part of its height, but not over its entire height, from its base, a peripheral recess in which is housed an insulating envelope, made of fibrous material, the outside diameter of this envelope being practically equal to that of the part top of the stud.
  • the fibrous insulating envelope of the pad which is independent of the refractory lining of the chenet, removes the pad from the radiation of the oven and makes its temperature not very dependent on its height.
  • the diameter of the upper part of the stud being practically equal to the diameter of the envelope, this upper part covers the envelope which is very fragile and protects it from mechanical actions due to the presence of the products supported by the stud, in particular from friction and of the scale fall.
  • the stud is advantageously made of refractory steel, for example cobalt steel. It can be in one piece. But it can also include a lower element whose height is substantially equal to that of the insulating envelope, and an upper element which is fixed to the lower element and whose diameter is substantially equal to that of the envelope.
  • the pad according to the invention comprises a lower element 1 and an upper element 2; the latter has a larger diameter than that of the element 1, which determines at the periphery of the stud a recess in which is housed an insulating envelope 3, for example of fibrous structure.
  • This envelope extends to the level of the lower face of the element 2 and its outside diameter is equal to that of this element 2.
  • the elements 1 and 2 are made of refractory steel, for example cobalt steel.
  • the height of element 2 is approximately between 0.2 and 0.4 times the total height of the stud.
  • the upper element 2 has at its base a central tail 2a passing through an axial hole la of the element 1.
  • the fixing of the two elements to each other is ensured by an oblique key (4) which crosses holes 5 and 6 formed respectively in element 1 and in the shank 2a of element 2.
  • the element 1 has at its base an axial recess 1b, which reduces the section offered to the hermetic flow t coming from the upper element of the stud. Its lower face lc is rounded to the profile of a tent. It is intended to be welded to the chenet by this rounded face lc.

Abstract

Support de produits pour four sidérurgique comportant sur une partie notable de sa hauteur, mais non sur toute sa hauteur, à partir de sa base, un évidement périphérique dans lequel est logée une enveloppe isolante (3), le diamètre extérieur de cette enveloppe étant pratiquement égal à celui de la partie supérieure (2) du plot.Product support for a steel furnace comprising on a significant part of its height, but not over its entire height, from its base, a peripheral recess in which is housed an insulating envelope (3), the external diameter of this envelope being practically equal to that of the upper part (2) of the stud.

Description

Les produits, en particulier les brames d'acier, qui sont chauffés avant laminage dans des fours, sont supportés sur des traverses (ou chenêts) refroidies par circulation d'eau ou de vapeur, par l'intermédiaire de supports appelés plots ou boutons.The products, in particular steel slabs, which are heated before rolling in ovens, are supported on sleepers (or chenets) cooled by water or steam circulation, by means of supports called studs or buttons.

Ces plots sont, en général, de forme cylindrique et placés sur les tubes chenêts à intervalles réguliers et maintenus par soudure sur le tube. Ils sont enrobés, sur une partie de leur hauteur par le garnissage réfractaire isolant qui entoure le chenet.These studs are, in general, cylindrical in shape and placed on the chenet tubes at regular intervals and maintained by welding on the tube. They are coated, over part of their height by the insulating refractory lining which surrounds the chenet.

Ces supports ou plots ont pour but d'éloigner la brame du tube chenêt pour protéger le garnissage des chocs mécaniques qui pourraient survenir lors des mouvements qui assurent la progression des produits dans le four.The purpose of these supports or studs is to move the slab away from the chenet tube to protect the lining from mechanical shocks which could occur during movements which ensure the progression of the products in the oven.

Le fait d'éloigner la brame du tube chenét a une autre conséquence qui est la diminution de l'effet d'ombre du chenet sur la brame. En effet, la chaleur qui est transmise à la brame dans le four l'est essentiellement par rayonnement et la proximité d'un tube refroidi même isolé par un garnissage réfractaire, fait obstacle au rayonnement du four sur le produit. Il en résulte une bande à plus basse température sur le produit, qui représente la trace du chenêt et qui est souvent appelée trace noire. L'intervalle existant entre le chenêt et la brame est déterminé par la hauteur du plot. Or, il est difficile d'augmenter beaucoup cette hauteur.Moving the slab away from the chenet tube has another consequence which is the reduction of the shadow effect of the chenet on the slab. Indeed, the heat which is transmitted to the slab in the oven is essentially by radiation and the proximity of a cooled tube even insulated by a refractory lining, prevents radiation from the oven on the product. This results in a strip at a lower temperature on the product, which represents the trace of chenet and which is often called a black trace. The interval between the chenet and the slab is determined by the height of the stud. However, it is difficult to greatly increase this height.

En effet, la partie du plot qui émerge du garnissage réfractaire reçoit le rayonnement du four et sa température croît rapidement avec la hauteur.Indeed, the part of the stud that emerges from the refractory lining receives radiation from the oven and its temperature increases rapidly with height.

Pour des raisons de tenue mécanique (résistance à l'écrasement, fluage), il est nécessaire que la température du plot ne dépasse pas une certaine valeur, valeur qui est fonction de la charge supportée par le plot lorsqu'il est en contact avec la brame. On constate en effet, que si un plot a, dès l'origine, une hauteur supérieure à la valeur habituelle, il s'écrase rapidement jusqu'à ce qu'il ait atteint cette valeur.For reasons of mechanical strength (resistance to crushing, creep), it is necessary that the temperature of the pad does not exceed a certain value, a value which is a function of the load supported by the pad when it is in contact with the slab. In fact, it can be seen that if a stud has a height greater than the usual value from the outset, it quickly crashes until it reaches this value.

Il n'est pas possible, d'autre part, de prolonger le garnissage réfractaire du chenet jusqu'à la partie supérieure du plot, de façon à isoler thermiquement ce dernier. En effet, les produits, pendant leur chauffage, laissent déposer de la calamine, due à l'oxydation, et cette calamine s'accumule sur le garnissage réfractaire. Il faut donc qu'il existe un espace suffisant entre la brame et le garnissage pour permettre la formation d'un talus de calamine qui se maintient ensuite à hauteur constante. Si cet espace est insuffisant, la calamine transmet au garnissage le poids de la brame et il s'ensuit une destruction du réfractaire.It is not possible, on the other hand, to extend the refractory lining of the chenet to the upper part of the stud, so as to thermally insulate the latter. Indeed, the products, during their heating, let deposit scale, due to oxidation, and this scale builds up on the refractory lining. There must therefore be sufficient space between the slab and the lining to allow the formation of a scale embankment which then remains at a constant height. If this space is insufficient, the scale transmits the weight of the slab to the lining and the refractory is destroyed.

La présente invention a pour objet un plot ou support de produit dans un four sidérurgique qui peut avoir une hauteur de support aussi grande que cela est nécessaire, sans atteindre une température prohibitive.The present invention relates to a pad or product support in a steel furnace which can have a support height as large as necessary, without reaching a prohibitive temperature.

Ce support est caractérisé en ce qu'il comporte sur une partie notable de sa hauteur, mais non sur toute sa hauteur, à partir de sa base, un évidement périphérique dans lequel est logée une enveloppe isolante, en matière fibreuse, le diamètre extérieur de cette enveloppe étant pratiquement égal à celui de la partie supérieure du plot.This support is characterized in that it comprises over a significant part of its height, but not over its entire height, from its base, a peripheral recess in which is housed an insulating envelope, made of fibrous material, the outside diameter of this envelope being practically equal to that of the part top of the stud.

L'enveloppe isolante fibreuse du plot, qui est indépendante du garnissage réfractaire du chenêt, soustrait le plot au rayonnement du four et rend sa température peu dépendante de sa hauteur. Le diamètre de la partie supérieure du plot étant pratiquement égal au diamètre de l'enveloppe, cette partie supérieure coiffe l'enveloppe qui est très fragile et la protège des actions mécaniques dues à la présence des produits supportés par le plot, notamment des frottements et de la chute de la calamine.The fibrous insulating envelope of the pad, which is independent of the refractory lining of the chenet, removes the pad from the radiation of the oven and makes its temperature not very dependent on its height. The diameter of the upper part of the stud being practically equal to the diameter of the envelope, this upper part covers the envelope which is very fragile and protects it from mechanical actions due to the presence of the products supported by the stud, in particular from friction and of the scale fall.

Le plot est avantageusement en acier réfractaire, par exemple en acier au cobalt.Il peut être en une seule pièce. Mais il peut également comprendre un élément inférieur dont la hauteur est sensiblement égale à celle de l'enveloppe isolante, et un élément supérieur qui est fixé sur l'élément inférieur et dont le diamètre est sensiblement égal à celui de l'enveloppe.The stud is advantageously made of refractory steel, for example cobalt steel. It can be in one piece. But it can also include a lower element whose height is substantially equal to that of the insulating envelope, and an upper element which is fixed to the lower element and whose diameter is substantially equal to that of the envelope.

On a décrit ci-après, à titre d'exemple non limitatif, un mode de réalisation du support ou plot selon l'invention, avec référence à la figure unique du dessin annexé qui est une vue en coupe axiale de ce plot.An embodiment of the support or pad according to the invention has been described below, by way of nonlimiting example, with reference to the single figure of the appended drawing which is an axial section view of this pad.

Tel qu'il est représenté au dessin, le plot selon l'invention comprend un élément inférieur 1 et un élément supérieur 2; ce dernier a un diamètre plus grand que celui de l'élément 1, ce qui détermine à la périphérie du plot un évidement dans lequel est logée une enveloppe isolante 3, par exemple de structure fibreuse. Cette enveloppe s'étend jusqu'au niveau de la face inférieure de l'élément 2 et son diamètre extérieur est égal à celui de cet élément 2. Les éléments 1 et 2 sont en acier réfractaire, par exemple en acier au cobalt. La hauteur de l'élément 2 est approximativement comprise entre 0,2 et 0,4 fois la hauteur totale du plot.As shown in the drawing, the pad according to the invention comprises a lower element 1 and an upper element 2; the latter has a larger diameter than that of the element 1, which determines at the periphery of the stud a recess in which is housed an insulating envelope 3, for example of fibrous structure. This envelope extends to the level of the lower face of the element 2 and its outside diameter is equal to that of this element 2. The elements 1 and 2 are made of refractory steel, for example cobalt steel. The height of element 2 is approximately between 0.2 and 0.4 times the total height of the stud.

L'élément supérieur 2 comporte à sa base une queue centrale 2a traversant un trou axial la de l'élément 1. La fixation des deux éléments l'un à l'autre est assurée par une clavette oblique (4) qui traverse des perçages 5 et 6 ménagés respectivement dans l'élément 1 et dans la queue 2a de l'élément 2.The upper element 2 has at its base a central tail 2a passing through an axial hole la of the element 1. The fixing of the two elements to each other is ensured by an oblique key (4) which crosses holes 5 and 6 formed respectively in element 1 and in the shank 2a of element 2.

L'élément 1 comporte à sa base un évidement axial 1b ,ce qui diminue la section offerte au flux t hermique provenant de l'élément supérieur du plot. Sa face inférieure lc est arrondie au profil d'un c henêt. Il est destiné à être soudé au chenêt par cette face arrondie lc.The element 1 has at its base an axial recess 1b, which reduces the section offered to the hermetic flow t coming from the upper element of the stud. Its lower face lc is rounded to the profile of a tent. It is intended to be welded to the chenet by this rounded face lc.

Il va de soi que la présente invention ne doit pas être considérée comme limitée au mode de réalisation décrit et représenté, mais en couvre,au contraire, toutes les variantes.It goes without saying that the present invention should not be considered as limited to the embodiment described and shown, but on the contrary covers all variants thereof.

Claims (6)

1. Support de produits pour four sidérurgique caractérisé en ce qu'il comporte sur une partie notable de sa hauteur, mais non sur toute sa hauteur, à partir de sa base, un évidement périphérique dans lequel est logée une enveloppe isolante (3), en matière fibreuse, le diamètre extérieur de cette enveloppe étant pratiquement égal à celui de la partie supérieure (2) du plot.1. Product support for a steel furnace, characterized in that it comprises over a substantial part of its height, but not over its entire height, from its base, a peripheral recess in which is housed an insulating envelope (3), in fibrous material, the outside diameter of this envelope being practically equal to that of the upper part (2) of the stud. 2. Support selon la revendication 1, caractérisé en ce qu'il est en acier réfractaire.2. Support according to claim 1, characterized in that it is made of refractory steel. 3. support selon la revendication 1 ou 2, caractérisé en ce qu'il comprend un élément inférieur (1) dont la hauteur est sensiblement égale à celle de l'enveloppe isolante (3); et un élément supérieur (2) qui est fixé sur l'élément inférieur et dont le diamètre est sensiblement égal à celui de l'enveloppe.3. support according to claim 1 or 2, characterized in that it comprises a lower element (1) whose height is substantially equal to that of the insulating envelope (3); and an upper element (2) which is fixed on the lower element and whose diameter is substantially equal to that of the envelope. 4. Support selon la revendication 3, caractérisé en ce que l'élément supérieur (2) comporte à sa base une queue centrale 2a traversant un trou axial la de l'élément inférieur 1.4. Support according to claim 3, characterized in that the upper element (2) comprises at its base a central tail 2a passing through an axial hole la of the lower element 1. 5. Support selon la revendication 4, caractérisé en ce qu'une clavette de fixation (4) traverse des perçages obliques (5) et (6) ménagés reapectivement dans l'élément inférieur (1) et dans la queue 2a de l'élément supérieur (2).5. Support according to claim 4, characterized in that a fixing key (4) passes through oblique bores (5) and (6) formed reactively in the lower element (1) and in the tail 2a of the element upper (2). 6. Support selon l'une des revendications 1 à 5, caractérisé en ce que sa partie inférieure est évidée.6. Support according to one of claims 1 to 5, characterized in that its lower part is hollowed out.
EP82401072A 1981-07-01 1982-06-14 Product support for a siderurgical furnace Expired EP0069613B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113205A FR2509027B1 (en) 1981-07-01 1981-07-01 PRODUCT SUPPORT FOR STEEL OVEN
FR8113205 1981-07-01

Publications (2)

Publication Number Publication Date
EP0069613A1 true EP0069613A1 (en) 1983-01-12
EP0069613B1 EP0069613B1 (en) 1986-03-05

Family

ID=9260222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401072A Expired EP0069613B1 (en) 1981-07-01 1982-06-14 Product support for a siderurgical furnace

Country Status (6)

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US (1) US4427187A (en)
EP (1) EP0069613B1 (en)
BE (1) BE893819A (en)
DE (1) DE3269601D1 (en)
FR (1) FR2509027B1 (en)
IN (1) IN157595B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5232359A (en) * 1991-07-26 1993-08-03 Campbell Frank Jun Device for increasing the thermal radiation heat transfer on an object in a furnace
US5362230A (en) * 1993-03-24 1994-11-08 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
US5370530A (en) * 1993-03-24 1994-12-06 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
US6179610B1 (en) 1999-12-30 2001-01-30 Paul V. Suey Composite refractory tile for metallurgical furnace members
US6575738B1 (en) 2002-08-16 2003-06-10 Carole S. Nguyen Composite refractory insulating tile

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015478A (en) * 1958-11-20 1962-01-02 Seias Corp Of America Furnace
FR1325350A (en) * 1962-06-12 1963-04-26 Brockmann & Bundt Ind Ofenbau Advancement system for pilgrim's ovens
DE2430490A1 (en) * 1974-06-25 1976-01-15 Hans Christoph Dr Ing Pohl Pusher-type billet heating furnace - billets are transported on ceramic inserts in sliding shoes pushed through the furnace
FR2297390A1 (en) * 1975-01-11 1976-08-06 Krupp Ag Huettenwerke CARRIER TUBE FOR PUSHING OVENS OR MOBILE SINGLE OVENS
EP0039630A1 (en) * 1980-05-06 1981-11-11 Societe Europeenne Des Produits Refractaires Skid provided with refractory ledges for a walking beam furnace

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1424319A (en) * 1920-11-02 1922-08-01 John P Northey Key bolt

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015478A (en) * 1958-11-20 1962-01-02 Seias Corp Of America Furnace
FR1325350A (en) * 1962-06-12 1963-04-26 Brockmann & Bundt Ind Ofenbau Advancement system for pilgrim's ovens
DE2430490A1 (en) * 1974-06-25 1976-01-15 Hans Christoph Dr Ing Pohl Pusher-type billet heating furnace - billets are transported on ceramic inserts in sliding shoes pushed through the furnace
FR2297390A1 (en) * 1975-01-11 1976-08-06 Krupp Ag Huettenwerke CARRIER TUBE FOR PUSHING OVENS OR MOBILE SINGLE OVENS
EP0039630A1 (en) * 1980-05-06 1981-11-11 Societe Europeenne Des Produits Refractaires Skid provided with refractory ledges for a walking beam furnace

Also Published As

Publication number Publication date
IN157595B (en) 1986-05-03
DE3269601D1 (en) 1986-04-10
BE893819A (en) 1982-11-03
FR2509027A1 (en) 1983-01-07
FR2509027B1 (en) 1986-08-22
US4427187A (en) 1984-01-24
EP0069613B1 (en) 1986-03-05

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