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EP0307474A1 - Procede et four a cubilot pour le traitement thermique de rouleaux de bandes metalliques - Google Patents

Procede et four a cubilot pour le traitement thermique de rouleaux de bandes metalliques Download PDF

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Publication number
EP0307474A1
EP0307474A1 EP87905555A EP87905555A EP0307474A1 EP 0307474 A1 EP0307474 A1 EP 0307474A1 EP 87905555 A EP87905555 A EP 87905555A EP 87905555 A EP87905555 A EP 87905555A EP 0307474 A1 EP0307474 A1 EP 0307474A1
Authority
EP
European Patent Office
Prior art keywords
bundles
ribs
muffle
convection
length
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.)
Withdrawn
Application number
EP87905555A
Other languages
German (de)
English (en)
Other versions
EP0307474A4 (fr
Inventor
Vladimir Alexeevich Krivandin
Ivan Vasilievich Frantsenjuk
Olga Vladilenovna Apterman
Anatoly Matveevich Belenky
Evgeny Ivanovich Bulatnikov
Boris Stepanovich Mastrjukov
Alexei Fedorovich Poputnikov
Valery Ivanovich Titov
Alexandr Kuzmich Gruznov
Jury Alexandrovich Mukhin
Vladimir Ivanovich Kulichkov
Evgeny Petrovich Pavlov
Igor Sergeevich Fokin
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.)
Moskovsky Institut Stali I Splavov
Original Assignee
Moskovsky Institut Stali I Splavov
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 Moskovsky Institut Stali I Splavov filed Critical Moskovsky Institut Stali I Splavov
Publication of EP0307474A1 publication Critical patent/EP0307474A1/fr
Publication of EP0307474A4 publication Critical patent/EP0307474A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire

Definitions

  • the present invention relates to iron and non-ferrous metallurgy and relates in particular to a method for the heat treatment of metal strip in coil form in a hood furnace and a hood furnace for its implementation.
  • the present invention can be used particularly effectively for the heat treatment of coils from cold-rolled, tightly wound thin sheet metal strips and strips made of steel of various types (carbon, alloy, electrical steel) and of non-ferrous metals and alloys.
  • the main problem with the production of cold-rolled metal is an improvement in quality and an increase in production output. To a significant extent, this is associated with the heat treatment of cold-rolled metal, which is carried out in bell-type furnaces.
  • the quality improvement of the products produced is determined by the same heating conditions, i.e. by the uniformity of the temperature field in the entire volume of the annealing material.
  • the increase in furnace throughput depends to a considerable extent on the intensification of the annealing furnace heating.
  • a method for heat treating metal strip in coil form in a hood furnace (Aptermann VN et al. "Hood furnace", 1964, Metallurgia (Moscow), pp. 8 to 10) is known, which consists in that several metal strip bundles are stacked, heated and be cooled.
  • the hood furnace for carrying out this method contains a stand with a diffuser and a circulation fan, a muffle, a heating hood with gas burners or electrical heating elements and convection rings which are arranged in a stack between the coils.
  • the hood lining and the muffle and, through the latter, the protective gas which is fed into the furnace space under the muffle, is heated.
  • the protective gas flows under the action of the circulation fan along the muffle surface, is heated and, when flowing through the convection rings, transfers the heat to the end faces of the collar by convection.
  • the height of the convection rings is usually chosen to be minimal in order to increase the circulating speed of the protective gas at the end faces of the collar and consequently the convective heat emission.
  • the gas temperature Due to the small height of the convection ring, there is sufficient effective heat transfer from the protective gas to the end faces of the collar. guaranteed by convection, but the heat transfer to it is practically impossible due to the muffle radiation.
  • a convection ring (SU, A, 3069I49), which represents a corrugated insert, and a convection ring (SU, A, 3618921), which is designed in the form of separate wedge-shaped inserts which are arranged in two rows on the circumference of the furnace.
  • a convection ring (SU, A, 436969) which contains radially extending support ribs and webs lying between the ribs, which are hollow and have a smaller height than the support ribs. Openings are provided on the outside of the webs.
  • Such a construction of the convection ring is aimed at intensifying the heat transfer to the end faces of the collar by convection.
  • the protective gas When flowing through the openings on the outside of the ring, the protective gas reaches the hollow webs between the ribs, from which it flows out through systems of openings in the form of individual jets directed towards the end faces of the collar.
  • the horizontal surfaces of the webs cover practically the entire front surface of the bundles, as a result of which the latter are shielded from the heat flow radiated by the muffle.
  • the invention has for its object to provide such a method for the heat treatment of metal in coil form in a hood furnace and such a hood furnace for its implementation, in which a uniform temperature field is ensured in the entire volume of the bundle stack while intensifying the heating process.
  • the minimum space between in a method for heat treatment of metal strip in bundle form in a hood furnace, which includes stacking the bundles with gaps, heating the bundles and cooling them under the muffle with forced circulation of a protective gas the bundles to be stacked is selected based on the condition that the heat flows which are transmitted from the protective gas by convection and from the muffle by radiation are essentially the same.
  • the method according to the invention makes it possible to achieve a uniform temperature field in the entire metal volume in the furnace while intensifying the heating.
  • the minimum space between the bundles is in one area chosen where.
  • the proposed minimum space allows not only the convection heat flow from the shielding gas, but also the radiant heat flow from the muffle to the face, which intensifies the metal heating. By redistributing the total heat flow over the radius of the metal coil, the temperature field in the coil volume is balanced.
  • a hood furnace for carrying out the process for heat treatment of coil-shaped metal strip which contains a stand with a built-in circulation fan, on which bundles of the metal strip are stacked under a muffle and a heating hood, which are separated by convection rings are, each of which is provided with radially extending support ribs and hollow webs lying between the ribs of a smaller height than the support rib height, according to the invention the height of the radially extending support ribs is 0.15 to 0.4 of their length.
  • the ring construction loses rigidity and with an increase in the support rib thickness to improve the ring rigidity, the ring weight is increased.
  • the radially extending support rings prefferably be hollow, to be closed on the inside of the ring and to be open on the outside.
  • the radiation penetrates from the muffle into the interior of the radially extending supporting ribs and reaches the collar end face via the openings on their horizontal surfaces, as a result of which the metal heating is additionally intensified.
  • the rib length is greater than the length of the webs lying between the ribs and that the projecting end parts of the ribs form grooves together with the webs.
  • the grooves between the ribs enlarge the front surface of the collar, which is affected by radiation from the muffle, which intensifies metal heating.
  • the webs lying between the ribs have a length of 0.5 to 0.9 of the length of the supporting ribs.
  • the process for the heat treatment of metal strip in coil form in a hood furnace includes the stacking of the bundles with gaps, the heating of the bundles and their cooling under the muffle with forced circulation of a protective gas.
  • the minimum space between the bundles to be stacked is selected on the basis that the heat flows which are transmitted from the protective gas by convection and from the muffle by radiation are essentially the same.
  • the minimum gap is in a range of selected, where D and d - the outer and inner diameters are corresponding.
  • the hood furnace for carrying out the method according to the invention contains a stand 1 (FIG. 1) with a built-in circulation fan 2 and a guide device 3 and a muffle 4 set up on stand 1, which is sealed with a sand seal 5.
  • Metal band bundles 6, 7, 8 are arranged under the muffle 4.
  • the muffle 4 is covered with a heating hood 9 from above, which is provided with gas burners 10 and a discharge system II for combustion products.
  • the bundles 6, 7, 8 of the metal strip lying one above the other form a stack which is covered by a screen 12 from above.
  • Convection rings 13, 14, 15 are arranged between the collars 6, 7, 8, each of which is designed in the form of hollow radially extending support ribs 16 (FIGS. 2, 3) which are connected to one another by webs 17 located between the ribs.
  • the height of the webs 17 is less than the height h of the ribs 16, which does not exceed 0.15 to 0.4 of their length.
  • the ribs 16 are closed on the inside and open on the outside, their length exceeding the length of the webs 17 and the protruding end parts of the ribs I6 on the outside forming grooves 18 together with the webs 17.
  • the length of the webs 17 is 0.5 to 0.9 of the length of the supporting ribs 16.
  • Each rib 16 has openings 19 on the upper and lower horizontal surfaces, through which the end faces of the bundles 6 are heated , 7, 8 intensified and the weight of the rings 13, 14, 15 is reduced.
  • the webs 17 are arranged relative to the ribs 16 so that they are at the same distance from the upper and lower horizontal surfaces of the ribs 16 and, together with the end faces of the bundles 6, 7, 8, spaces 20 for the flow of the protective gas and for heat transfer to the central area of the bundles 6, 7, 8 form by convection.
  • the webs 17 and supporting ribs 17 lying between the ribs are connected to one another in such a way that they have a ring construction with a continuous inner channel 21 for the flow of the protective gas form.
  • the minimum gap between bundles 6, 7, 8 is determined according to the formula calculated.
  • the convection rings I3, I4, 15 of the required height are selected in accordance with the calculated size of the space.
  • the convection ring 13, on which the collar 6 is arranged, is placed on the support plate of the guide apparatus 3.
  • the convection ring I4 is arranged on the upper end face of the collar 6, the collar 7 etc. on its upper end face.
  • the bundle stack can contain 2 to 4 bundles depending on the height of bundles 6, 7, 8 and the muffle 4. After the stack of bundles 6, 7, 8 has been built up, it is covered with the muffle 4, under which a protective gas, for example a hydrogen-nitrogen mixture (4% H 2 + 96% N 2 ), is fed.
  • the muffle 4 is covered with the heating hood 9 from above and the burner 10 is ignited.
  • the heat of combustion is transferred to the muffle 4 and from there to the protective gas (by convection) and to the side surfaces of the collars 6, 7, 8 (by radiation).
  • the protective gas flows through the convection rings 13, 14, 15 and gives off the heat to the end faces of the bundles 6, 7, 8 by convection (dashed arrows in FIG. 1).
  • the radiation passes from the muffle 4 into the interior of the convection ring I3, I4, 15 (solid arrows in FIG. 1) and through the grooves I8 and the opening I9 (FIG. 2) onto the end face of the collars 6, 7, 8.
  • the present invention can be applied to heat. handling of coils made of cold-rolled, tightly wound thin strips and strips of steel of various types as well as of non-ferrous metals and alloys.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Furnace Details (AREA)
  • Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)

Abstract

Le procédé consiste à empiler les rouleaux de bandes métalliques, en provoyant entre eux des espacements, à chauffer lesdits rouleaux et à les refroidir sous le moufle au moyen d'un gaz de protection à circulation forcée. On choisit la dimension minimale des espaces entre les rouleaux empilés de manière à assurer des écoulements thermiques égaux, transmis par convexion à partir du gaz protecteur et par rayonnement à partir du moufle. Le four à cubilot utilisé pour ledit procédé comporte un support avec un ventilateur incorporé, sur lequel on place, sous le moufle et un couvercle de chauffe, un empilement de rouleaux mutuellement séparés par des anneaux de convexion (13, 14, 15). Chaque anneau (13, 14, 15) comporte des nervures radiales de support (16) raliées par des cloisons intercostales (17). La hauteur (h) des nervures radiales (16) correspond à 0,15-0,4 de leur longueur.
EP19870905555 1987-03-27 1987-03-27 Procede et four a cubilot pour le traitement thermique de rouleaux de bandes metalliques. Withdrawn EP0307474A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1987/000040 WO1988007590A1 (fr) 1987-03-27 1987-03-27 Procede et four a cubilot pour le traitement thermique de rouleaux de bandes metalliques

Publications (2)

Publication Number Publication Date
EP0307474A1 true EP0307474A1 (fr) 1989-03-22
EP0307474A4 EP0307474A4 (fr) 1990-06-05

Family

ID=21617094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870905555 Withdrawn EP0307474A4 (fr) 1987-03-27 1987-03-27 Procede et four a cubilot pour le traitement thermique de rouleaux de bandes metalliques.

Country Status (3)

Country Link
EP (1) EP0307474A4 (fr)
JP (1) JPH01502760A (fr)
WO (1) WO1988007590A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009076686A1 (fr) * 2007-12-19 2009-06-25 Ebner Industrieofenbau Gesellschaft M.B.H. Dispositif de soutien de paquets de tôles dans un four à calciner haute température

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6024922B2 (ja) * 2013-12-19 2016-11-16 Ｊｆｅスチール株式会社 仕上焼鈍後コイルの冷却方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1249901B (de) * 1967-09-14 Matthias Ludwig Industrieofenbau, Essen Konvektorplatte fur Haubengluhofen
DE1219059B (de) * 1962-01-09 1966-06-16 Voest Ag Als Unterlage fuer Blechbunde bei der Waermebehandlung in Haubenoefen dienender Konvektor
US3373983A (en) * 1966-01-07 1968-03-19 Alloy Engineering Company Separator plate
US3540710A (en) * 1967-12-14 1970-11-17 Tokyo Gas Co Ltd Gas annealing furnace
SU436969A1 (ru) * 1972-06-29 1974-07-25 Всесоюзный научно-исследовательский институт металлургической теплотехники Конвекторное кольцо
RO75367A (fr) * 1977-11-25 1980-11-30 Alleghany Ludlum Industries,Inc.,Us Four pour recuit des bandes metalliques en forme de glene
US4596526A (en) * 1985-03-04 1986-06-24 Worthington Industries, Inc. Batch coil annealing furnace and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009076686A1 (fr) * 2007-12-19 2009-06-25 Ebner Industrieofenbau Gesellschaft M.B.H. Dispositif de soutien de paquets de tôles dans un four à calciner haute température
US8226885B2 (en) 2007-12-19 2012-07-24 Ebner Industrieofenbau Gmbh Apparatus for bracing of sheet-metal joints in a high-temperature annealing furnace

Also Published As

Publication number Publication date
EP0307474A4 (fr) 1990-06-05
WO1988007590A1 (fr) 1988-10-06
JPH01502760A (ja) 1989-09-21

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