EP0039630B1 - Plots réfractaires pour fours à longerons - Google Patents

Plots réfractaires pour fours à longerons Download PDF

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Publication number
EP0039630B1
EP0039630B1 EP81400646A EP81400646A EP0039630B1 EP 0039630 B1 EP0039630 B1 EP 0039630B1 EP 81400646 A EP81400646 A EP 81400646A EP 81400646 A EP81400646 A EP 81400646A EP 0039630 B1 EP0039630 B1 EP 0039630B1
Authority
EP
European Patent Office
Prior art keywords
refractory
skid button
button according
shell
studs
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
EP81400646A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0039630A1 (fr
Inventor
Jean-Marc Bourdon
Jean-Claude Hugues
Marc Esnoult
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.)
Societe Europeenne des Produits Refractaires SAS
Original Assignee
Societe Europeenne des Produits Refractaires SAS
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 Societe Europeenne des Produits Refractaires SAS filed Critical Societe Europeenne des Produits Refractaires SAS
Publication of EP0039630A1 publication Critical patent/EP0039630A1/fr
Application granted granted Critical
Publication of EP0039630B1 publication Critical patent/EP0039630B1/fr
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

Definitions

  • the invention relates to beam ovens and relates more particularly to studs or refractory buttons for such ovens.
  • ovens with cooled mobile beams have tended to replace push furnaces for reheating slabs, blooms or steel billets due in particular to their superior production capacity, their good reliability and their economic interest.
  • the load (slabs, blooms or billets) to be heated passes successively from the moving beams to fixed beams, without friction, by controlled installation and removal on spaced studs or buttons, integral with the beams and protruding from the top of said beams.
  • the longitudinal members being made up of a metal tube (with a diameter of approximately 130 to 220 mm) internally cooled by a circulation of water and a relatively thick insulating refractory lining (approximately 60 mm) sheathing said tube, there would be advantage that the studs or buttons are as high as possible so that their upper face is at a temperature as close as possible to that of the lower face of the load. Also, the higher the studs or buttons, the less there is to fear the shadow effect that the side members and their insulating lining can exert on the heating of the load by the lower side burners.
  • the studs or buttons currently used which are made of an alloy with 50% of cobalt, 30% of chromium and 20% of iron, tend to crush, due to an insufficient creep resistance, after a few months of operation when their height exceeds a certain value (approximately 90 mm), passing from an initial cylindrical shape to that of a mushroom, owing to the fact that the stresses which can be supported by the metal decrease when the temperature in service of the metal increases , which is the case when increasing the height of the studs or buttons. For this reason, the height of the current studs is in the range of 70 to 90 mm.
  • the object of the present invention is to satisfy this need by providing a new stud or button for longitudinal beam ovens.
  • the invention relates to a stud or button for longitudinal beam ovens comprising a body of refractory material based on oxides, and a jacket of refractory metal alloy surrounding the periphery of the body, means being provided to prevent tearing up. of the body compared to his shirt.
  • the body protrudes slightly at its upper part relative to the shirt.
  • the stud or button further comprises a metal reinforcement embedded in the body of refractory material.
  • pad or button is meant both elements of generally circular shape and of generally square, rectangular or other shape.
  • the anti-tearing means may consist in giving the shirt a section which decreases from its base to its top, for example in giving the shirt a frustoconical or pyramidal shape. Alternatively, one could give the shirt a wavy shape or provide protrusions on the inner surface of the shirt intended to hold the body against any force aimed at tearing it from its shirt.
  • refractory concretes and sintered refractory materials with a high alumina content instead of molten and cast refractories, it is also possible to use refractory concretes and sintered refractory materials with a high alumina content, in particular the refractory concretes described in the French patent and addition applications FR-A-2 359 090 and FR-A-2390400 or in US-A-4111 711, especially those containing chromium oxide.
  • molten and cast refractory materials also called electrofused
  • the stud of the invention further comprises a metal sole on which the refractory body rests, so as to distribute the compression forces exerted on the body over a larger surface of the cooled spar.
  • the studs or buttons according to the invention have heights of at least about 70 mm, preferably 100 + 150 mm in order to minimize the thermal transfer of the load to be heated to the cooled beams.
  • Such a height which represents a significant advance compared to the 70-90 mm of the studs or buttons of the prior art, is made possible thanks to the low rate of creep at high temperature of the refractory materials used to constitute the body of the studs of the invention.
  • MAGMALOX @ resists for example, at 1300 ° C at pressures of the order of 30 N / mm 2 while the compression forces exerted on the pads by the loads to be heated are of the order of 2.5 to 3 N / mm 2 .
  • the thermal transfer of the charge to be heated to the cooled longitudinal members is greatly minimized, which makes it possible to obtain an improved uniformity of heating.
  • the metallic reinforcement aims to improve the resistance to mechanical and thermal shocks of the body, the refractory materials being relatively fragile to these shocks. Also, in the event of breakage of the body, this reinforcement tends to retain the pieces of the body which would otherwise risk being torn from the stud, for example as a result of bonding with the scale of the charges to be heated.
  • the metal reinforcement can have various configurations. It may, for example, be constituted by a metal insert of cruciform shape or in the form of fins secured to a central mast. It can also consist of fins integral with the jacket and distributed over the internal surface of the latter, in which case the metal reinforcement can simultaneously fulfill the role of the anti-tearing means.
  • the studs or buttons of the invention can be easily attached to the side members supporting them by welding from the base of the liner to said side members.
  • the manufacture of a stud or button of the invention when a melted and cast refractory material is used to constitute the body of the stud, can be carried out by pouring into the jacket resting on its base the melted refractory material and by l 'allowing it to solidify, a counterweight being provided on the top of the shirt forming the mold so as to locate the recess cavity therein. After cooling, the solidified part corresponding to the counterweight is sawed, the saw line being slightly above the top of the shirt.
  • the refractory body is made to rest on a metal soleplate which distributes the stress over a larger area of the cooled spar.
  • FIGS. 1 a and 1 b we see a part of a longron made up of a metal tube 1 cooled by a circulation of water and of a refractory thermal insulation 2.
  • This spar carries at its upper part a stud, designated by the general reference 3, consisting of a body 4 of melted and cast refractory material, of a jacket 5 of refractory steel of generally frustoconical shape surrounding the body and of an insert 6 of refractory steel constituting a cruciform piece 7 welded at its base to a round steel sole 8, the cruciform part being embedded in the refractory material of the body.
  • the stud 3 is fixed by welding the base of the shirt 5 to the tube 1, and the body protrudes slightly, at its upper part, relative to the shirt.
  • the stud may have a height of 120 mm and a diameter at its top of 110 mm and at its base of 130 mm.
  • the projection of the body relative to the shirt can be of the order of 2 mm.
  • the tapered shape of the shirt prevents the body from being torn off.
  • FIGS. 2a and 2b which illustrate an alternative embodiment of the pad of the invention
  • a pad designated by the general reference 13 consisting of a body 14 made of melted and cast refractory material and surrounded by a jacket 15 in refractory steel of generally cylindrical shape.
  • the jacket 15 carries on its internal face a plurality of fins 16 made of refractory steel, for example in the form of groups of 3 or 4 fins distributed at 90 ° from one another as shown in FIG. 2b, the fins of opposite groups being offset from each other in the height direction as shown in Figure 2a.
  • These fins are embedded in the molten refractory material and poured during the manufacture of the stud and prevent any tearing of the body in service.
  • FIGS 3a and 3b illustrate yet another type of stud according to the invention.
  • This stud designated by the general reference 23, has a rectangular shape in horizontal section and consists of a body 24 of molten and cast refractory material, of a jacket 25 of refractory steel in the general shape of a pyramid trunk based rectangular, and an insert 26 of refractory steel consisting of a rectangular plate 27 carrying fins 28 distributed on its faces.
  • the type of studs in Figures 3a and 3b is more particularly suitable for reheating narrow parts (billets) which impose almost continuous support along the side members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP81400646A 1980-05-06 1981-04-23 Plots réfractaires pour fours à longerons Expired EP0039630B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8010072 1980-05-06
FR8010072A FR2484620A1 (fr) 1980-05-06 1980-05-06 Plots refractaires pour fours a longerons

Publications (2)

Publication Number Publication Date
EP0039630A1 EP0039630A1 (fr) 1981-11-11
EP0039630B1 true EP0039630B1 (fr) 1983-07-27

Family

ID=9241655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400646A Expired EP0039630B1 (fr) 1980-05-06 1981-04-23 Plots réfractaires pour fours à longerons

Country Status (8)

Country Link
US (1) US4368038A (enrdf_load_stackoverflow)
EP (1) EP0039630B1 (enrdf_load_stackoverflow)
JP (1) JPS5831365B2 (enrdf_load_stackoverflow)
BR (1) BR8102685A (enrdf_load_stackoverflow)
CA (1) CA1163439A (enrdf_load_stackoverflow)
DE (1) DE3160686D1 (enrdf_load_stackoverflow)
FR (1) FR2484620A1 (enrdf_load_stackoverflow)
MX (1) MX155474A (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2509027B1 (fr) * 1981-07-01 1986-08-22 Stein Heurtey Support de produits pour four siderurgique
US4906525A (en) * 1987-01-16 1990-03-06 Sumitomo Metal Industries, Inc. Heat-resisting supporting member
US4900248A (en) * 1988-01-26 1990-02-13 Daido Tokushuko Kabushiki Kaisha Skid rail
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
AUPN261595A0 (en) * 1995-04-28 1995-05-18 Advanced Materials Enterprise Pty Ltd Furnace rider bar assembly
CN103217019A (zh) * 2013-04-22 2013-07-24 赵桐斌 加热炉水梁包扎用陶瓷纤维组合式包扎块及其包扎方法

Family Cites Families (8)

* 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 (fr) * 1962-06-12 1963-04-26 Brockmann & Bundt Ind Ofenbau Système d'avancement pour fours à pas de pèlerin
US3471134A (en) * 1968-02-26 1969-10-07 Midland Ross Corp Walking beam furnace
FR2038621A5 (en) * 1969-03-06 1971-01-08 Stein Surface Cooled slide bars for supporting metal - pieces in a heating furnace
GB1342891A (en) 1970-01-23 1974-01-03 Morgan Refractories Ltd Sheathing metal members in furnaces
DE2346826A1 (de) * 1973-09-18 1975-03-27 Koppers Wistra Ofenbau Gmbh Hubbalkenofen
JPS5144709U (enrdf_load_stackoverflow) * 1974-09-26 1976-04-02
US4293299A (en) * 1980-04-04 1981-10-06 Gaddes Robert N Load support device for heat furnaces

Also Published As

Publication number Publication date
FR2484620B1 (enrdf_load_stackoverflow) 1982-10-15
BR8102685A (pt) 1982-01-26
JPS572825A (en) 1982-01-08
MX155474A (es) 1988-03-17
FR2484620A1 (fr) 1981-12-18
CA1163439A (en) 1984-03-13
JPS5831365B2 (ja) 1983-07-05
DE3160686D1 (en) 1983-09-01
US4368038A (en) 1983-01-11
EP0039630A1 (fr) 1981-11-11

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