EP0875304A2 - Procédé et agrégat de refroidissement pour refroidir des produits de laminage chauds, notamment des bandes larges laminées à chaud - Google Patents

Procédé et agrégat de refroidissement pour refroidir des produits de laminage chauds, notamment des bandes larges laminées à chaud Download PDF

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Publication number
EP0875304A2
EP0875304A2 EP98107703A EP98107703A EP0875304A2 EP 0875304 A2 EP0875304 A2 EP 0875304A2 EP 98107703 A EP98107703 A EP 98107703A EP 98107703 A EP98107703 A EP 98107703A EP 0875304 A2 EP0875304 A2 EP 0875304A2
Authority
EP
European Patent Office
Prior art keywords
cooling
cooling medium
rolling
rolling stock
pressure
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
EP98107703A
Other languages
German (de)
English (en)
Other versions
EP0875304B1 (fr
EP0875304A3 (fr
Inventor
Meinert Dipl.-Ing. Meyer
Uwe Dipl.-Ing. Plociennik
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
SMS Demag AG
Schloemann Siemag AG
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 SMS Schloemann Siemag AG, SMS Demag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0875304A2 publication Critical patent/EP0875304A2/fr
Publication of EP0875304A3 publication Critical patent/EP0875304A3/fr
Application granted granted Critical
Publication of EP0875304B1 publication Critical patent/EP0875304B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • 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
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/04—Ferritic rolling
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices

Definitions

  • the invention relates to a method for cooling hot rollers Rolled stock, in particular for cooling hot broadband on both sides, in which forced convection during heat exchange between rolling stock and cooling medium with the help of a pressure water flow in a pressure chamber and convection space and the rolling stock by targeted Controlling the intensity of forced convection is cooled.
  • the invention also relates to a device for carrying out the Procedure.
  • DE 39 27 276 A1 discloses a method for hardening steel with the aid of liquid cooling media. It follows that with the previously known methods for hardening steel with the aid of liquid cooling media, only a small hardening depth, based on the edge zone, is achieved even with rods with small rod diameters.
  • the method according to DE 39 29 276 A1 not only enables a considerable increase in the hardening depth, but also a complete hardening, in particular of rod-shaped rolled products up to 70 mm in diameter, in a particularly simple manner in that the rolled product made of steel immediately after the rolling process supplied with cooling media cooling section and exposed to high flow velocities, expediently the flow velocities in the cooling section are so high that heat transfer numbers greater than or equal to 50,000 W / m 2 K are generated and the rolling stock is cooled therein until the average temperature of the rolling stock cross section is below the MS temperature, so that after leaving the cooling section through the temperature compensation over the cross section, the austenite still present in the core is converted into intermediate stage structure bainite, while at the same time in the martensitic n A large part of the overlapping thermal and transformation stresses is reduced by the temperature rising again to a maximum of MS temperature.
  • DE-OS 25 43 75 with a device for cooling section steels and flat material mentioned by arrangement of spray nozzles, with which only relatively low cooling intensities can be achieved, and frequent clogging of these nozzles leads to irregular cooling the length and width of the flat material with the consequence of warpage of the material and malfunctions in the rolling operation.
  • DE-AS 22 35th 063 becomes a slotted nozzle with an adjustable cross direction to the rolling direction Internal wedge is provided, thus avoiding blockages Amount of cooling water and thus the cooling intensity can be controlled.
  • Heat exchange part consists of a tube with a rectangular cross-section, which is lined with wear-resistant guide elements, whereby the inner surfaces opposite the broad sides of the rolling stock of the guide elements over the length of the heat exchange part have variable clear height, while the narrow sides of the rolling stock opposite inner surfaces of the guide elements a constant clear width over the length of the heat exchange part exhibit.
  • EP 0 266 302 B1 discloses a method for cooling while being warm Rolled stock, with / without direct patenting, with the pressurized water inside a pressure chamber between the accumulation edges on the hot rolled surface of the rolling stock is pressed.
  • the cooling unit comes with a lot Pressurized water, preferably with the rolling stock depriving amount of heat is in equilibrium with the heat withdrawal by heating pressurized water in the pressure chamber of a convection refrigerator as well as by removing heat from a pressurized water-steam mixture emitted heat of vaporization, preferably up to to the boiling point of the pressurized water, the desired cooling temperature to achieve the rolling stock while cooling in pressurized water as well as in a pressurized water-steam mixture.
  • the cooling unit consists of the pressure chamber of a convection cooling part, the so-called convection pressure space between the storage edges, in the hot rolled material, mainly by convection, from inflowing and pressed onto the hot rolled surface of the rolling stock Pressurized water heat, preferably up to the boiling point of the pressurized water, is withdrawn.
  • the cooling unit also consists of the pressure chamber of an evaporative cooling section, the so-called evaporative pressure chamber between the accumulation edges, in which the rolling stock primarily through heat of vaporization, from the flowing through and up pressurized water-steam mixture pressed on the surface of the rolling stock Heat is removed.
  • EP 0 287 503 B1 relates to a method and a pressure cooling unit for cooling a continuous product and contains features through which the suggestions according to EP 0 266 302 B1 are further developed are, with the procedural features that the Heat extraction in the convection cooling section and in the evaporative cooling section of the Pressure chamber in the pressure cooling unit except with the specified inflowing Cooling pressure water volume and the regulated inflowing Guide pressure water quantity in the convection refrigerator, with a additional, regulated inflow of guide pressure water in the evaporative cooling section and continue with one, in the area of the high Proportion of steam in the hot water-steam mixture flowing through the evaporative cooling part, doses the inflowing amount of condensation water, to be led.
  • the device is described in that in addition to the cooling and Guide pressure water inflow into the convection cooling section in the Evaporative cooling section further guide pressurized water inflows and further condensation pressurized water inflows are arranged.
  • the present invention lies in relation to this prior art based on the task of a significantly simplified procedure for Cooling of hot rolled rolling stock and a corresponding device to specify in the case of a largely reduced cooling section length at Flat material, especially in the case of hot wide strip with thin dimensions, better cooling results due to high intensity of cooling achieve.
  • the invention provides that to control the residence time of the rolling stock in the pressure chamber at a given rolling speed axial length of the cooling section formed in the pressure chamber can be changed is set.
  • the cooling medium in the pressure chamber can be in the rolling direction or run across it.
  • the amount of the pro Unit of time flowing into the pressure chamber by a cooling medium cross-sectional nozzle gap is set, the same time the speed and direction of the incoming cooling medium certainly.
  • the amount can be varied by varying the inlet pressure to be changed.
  • the cooling medium before the terminal Diffuser a convection area with increased speed and low flow pressure which also flows the length of the Limited pressure space and preferably variable in the axial direction is set.
  • the length By adjusting the length accordingly Pressure point, the point at which the unstable film evaporation begins and the so-called suffering frost point is achieved.
  • the cooling medium is turned off after absorbing heat the rolling stock in the area of the pressure increase from the diffuser and dissipated.
  • the measure can be used to advantage, that the flow cross section of the pressure chamber by changing the Distance between the surface of the rolling stock and at least one Wall of the pressure chamber is set.
  • the Invention can be provided that the pressure chamber transverse to the direction of flow of the cooling medium using preferably parallel Guide elements divided into individual, adjacent channels becomes. So far, this has not resulted or only with great Possibility achievable through different loading cooling of the individual flow channels over the bandwidth For example, to influence flatness and especially edge cooling to control or supercooling and at the same time to reduce consumption to minimize cooling medium.
  • everyone can Cooling channel with regard to the pressure and quantity of the cooling medium can be controlled individually.
  • the setting of the cooling temperature takes place via an adjustment of the nozzle gap and additionally with the cooling medium pressure.
  • the measure can also be used, that the flow cross-section in the pressure chamber in the existing ones Channels are wedge-shaped in some areas in the direction of flow becomes. As a result, the flow velocity and thus the The cooling effect can be varied locally.
  • Another advantage of this invention is that between surfaces of the Rolled stock and walls of the pressure chamber have gap-like flow areas formed and pressed by this cooling medium at high pressure, such that the rolling stock between formed by the cooling medium Liquid films is performed.
  • the baffle element can change the length of the Pressure chamber and convection room longitudinally adjustable in the rolling direction be trained. It is also provided that the nozzle gap as Actuator has a wedge.
  • An embodiment of the device according to the invention provides that the diffuser in the area of increased cooling medium pressure outlets for Removing heated cooling medium.
  • the device can be configured above or below and preferably above and below the rolling stock to form a box-shaped Channel with connections for cooling medium can be arranged and consist of flat plates in which on the rolling stock Side flow channels incorporated or by means of attached Last are trained.
  • the device is a scraper with a nozzle gap, preferably in the form of a screw, which coolant collects.
  • the device for cooling hot rolled rolling stock 1, in particular of hot wide strip with one for heat exchange between rolling stock 1 and cooling medium preferred to raise the suffering frost temperature trained pressure chamber 10 and the subsequent unpressurized Convection room 13 with means for forming a pressure medium flow as well as controlling the intensity of forced convection formed so that the pressure chamber 10 on the inlet side of the Rolled stock 1 has an inflow 32 for the cooling medium in the form of a quantity and pressure adjustable nozzle gap 11 and a terminal Diffuser 12 having means 16 for withdrawing the cooling medium.
  • a is in front of the diffuser 12 in the rolling direction
  • Pressure chamber 10 delimiting baffle element 33 arranged the beginning of the convection space 13 forms.
  • the adjustable nozzle gap 11 By the interaction of the adjustable nozzle gap 11 with the length adjustable pressure chamber 10 and the subsequent unpressurized convection space 13 and the final diffuser 12 and with removal 16 of the cooling medium can by tuning Dwell time of the rolling stock 1 as it passes through the pressure chamber 10 and convection space 13 (e.g. by changing the length of the cooling section) as well as the quantity, pressure and flow rate of the cooling medium the intensity of forced convection can be controlled reproducibly and the cooling medium heat from the rolling stock preferably with a sufficient Distance to the boiling point limit to avoid the unstable film evaporation.
  • the heat transfer is therefore precisely adjustable.
  • the axial length of the cooling section formed in the pressure chamber 10 can be set changeable, for example by a length-adjustable Damming element 33, which is also the beginning of the convection space 13.
  • the cooling device which is in Fig. 1 only once above the hot strip 1 is shown, can advantageously also be mirror-symmetrical from the bottom of the rolling stock 1 arranged in an identical manner be.
  • the nozzle gap 11 has a wedge 34 as an actuator.
  • By its setting according to arrow 38 can amount and / or Pressure of the cooling medium delivered by the inflow 32 is set will.
  • the known disadvantages of constipation tending spray nozzles completely avoided.
  • the cooling device consists of a flat Plate 23, the flow channels on the side facing the rolling stock 1 22 owns.
  • the size and number of these channels 22 vary accordingly the rolling stock width.
  • the Flow channels 22 between rectangular band guide rails 21 arranged with a flat surface to the rolling stock 1. So that with a Cooling between these channels 22 and the rolling stock 1 simultaneously the rolling stock 1 is guided.
  • Another advantageous design provides the adjustability of the Flow channels in the longitudinal direction in height, with this also can be wedge-shaped. This allows the flow rate and as a result, the cooling effect is specifically varied or set will.
  • the cooling device shown and described can be above or also below or on both sides of the rolling stock 1 and in the short Guide can be used between two roll stands, for example.
  • This Scraper member 36 preferably has a collecting space in the form of a Screw that surely collects excess cooling medium.
  • FIG. 1 Another design of a cooling device according to the invention
  • the figures show guidance of the cooling medium transversely to the rolling direction 3 and 4.
  • the device consists of a number of water boxes 35, which are arranged above or below the flat product 1. she have inflows 32 for to be introduced under high pressure Cooling medium and mushroom-shaped or wedge-shaped outlet regulators 34 on. They also form circular on their periphery, or in another variant straight nozzle column 11, from which the Cooling medium under high pressure in the convection pressure chambers 10 exit.
  • the shafts are with short central bores provided and have an entry hole transverse to it, so that Pressurized water emerges from the holes below the wedges 34 and a cooling effect in the pressure rooms 10 under forced convection exercises.
  • FIGS. 3 and 4 clearly shows between the upper and lower water tanks 35 a lateral offset provided to overcool to avoid the rolling stock 1 in the middle of the device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP98107703A 1997-05-02 1998-04-28 Procédé et agrégat de refroidissement pour refroidir des produits de laminage chauds, notamment des bandes larges laminées à chaud Expired - Lifetime EP0875304B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19718530A DE19718530B4 (de) 1997-05-02 1997-05-02 Verfahren zum Kühlen von walzwarmem Walzgut und Vorrichtung zur Durchführung des Verfahrens und Verwendung der Vorrichtung
DE19718530 1997-05-02

Publications (3)

Publication Number Publication Date
EP0875304A2 true EP0875304A2 (fr) 1998-11-04
EP0875304A3 EP0875304A3 (fr) 2002-01-02
EP0875304B1 EP0875304B1 (fr) 2003-12-10

Family

ID=7828395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107703A Expired - Lifetime EP0875304B1 (fr) 1997-05-02 1998-04-28 Procédé et agrégat de refroidissement pour refroidir des produits de laminage chauds, notamment des bandes larges laminées à chaud

Country Status (4)

Country Link
EP (1) EP0875304B1 (fr)
AT (1) ATE255965T1 (fr)
DE (2) DE19718530B4 (fr)
ES (1) ES2212167T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010006750A2 (fr) * 2008-07-12 2010-01-21 Sms Siemag Ag Procédé permettant le guidage longitudinal d'un produit laminé, en particulier d'une bande d'acier laminée à chaud, et laminoir à chaud pour la mise en oeuvre de ce procédé

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10215118C1 (de) * 2002-04-05 2003-06-12 Rainer Menge Anordnung zum Kühlen wärmebehandelter Drähte
DE102012211454A1 (de) 2012-07-02 2014-01-02 Sms Siemag Ag Verfahren und Vorrichtung zur Kühlung von Oberflächen in Gießanlagen, Walzanlagen oder sonstigen Bandprozesslinien
DE102012223848A1 (de) 2012-12-19 2014-06-26 Sms Siemag Ag Vorrichtung und Verfahren zum Kühlen von Walzgut

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543750A1 (de) * 1974-10-04 1976-04-15 Centre Rech Metallurgique Verfahren und vorrichtung zur verbesserung der qualitaet bei profilstahl
EP0266302A1 (fr) * 1986-08-07 1988-05-04 Walter Dipl.-Ing. Krenn Agrégat de refroidissement et procédé pour refroidir des matières à laminer à chaud avec/sans patentage directe à pression hydraulique
JPS63101017A (ja) * 1986-10-15 1988-05-06 Kawasaki Steel Corp 高温鋼板の冷却装置
WO1989007993A1 (fr) * 1988-03-02 1989-09-08 Ashlow Engineering Limited Tuyau sous pression
DE4009228A1 (de) * 1990-03-22 1991-09-26 Krenn Walter Verfahren und druckkuehlaggregat zum gleichzeitig unterschiedlichen abkuehlen ausgewaehlter bereiche durchlaufenden produktionsguts, mit flach- oder profilquerschnitt, aus stahl und anderem

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064771B1 (fr) * 1981-05-13 1985-09-18 VEB Stahl- und Walzwerk "Wilhelm Florin" Hennigsdorf Tube de refroidissement à pression pour le refroidissement intensif d'un produit laminé
DD244298B1 (de) * 1985-12-11 1988-02-10 Florin Stahl Walzwerk Waermeaustauschteil mit rechteckigem querschnitt fuer ein druckkuehlrohr
DE3708128A1 (de) * 1987-03-13 1988-09-22 Krenn Walter Verfahren und druckkuehlaggregat zum gefuehrten abkuehlen geformten, schweren bis leichten, heissen, durchlaufenden produktionsguts aus stahl und metall in druckwasser
DE3927276A1 (de) * 1989-08-18 1991-02-21 Schloemann Siemag Ag Verfahren zum haerten von stahl mit hilfe fluessiger kuehlmedien
DE4429203C2 (de) * 1994-08-18 1997-05-28 Krenn Walter Verfahren und Druckkühlaggregat zum Abkühlen eines durchlaufenden Produktionsgut aus Stahl oder anderem

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2543750A1 (de) * 1974-10-04 1976-04-15 Centre Rech Metallurgique Verfahren und vorrichtung zur verbesserung der qualitaet bei profilstahl
EP0266302A1 (fr) * 1986-08-07 1988-05-04 Walter Dipl.-Ing. Krenn Agrégat de refroidissement et procédé pour refroidir des matières à laminer à chaud avec/sans patentage directe à pression hydraulique
JPS63101017A (ja) * 1986-10-15 1988-05-06 Kawasaki Steel Corp 高温鋼板の冷却装置
WO1989007993A1 (fr) * 1988-03-02 1989-09-08 Ashlow Engineering Limited Tuyau sous pression
DE4009228A1 (de) * 1990-03-22 1991-09-26 Krenn Walter Verfahren und druckkuehlaggregat zum gleichzeitig unterschiedlichen abkuehlen ausgewaehlter bereiche durchlaufenden produktionsguts, mit flach- oder profilquerschnitt, aus stahl und anderem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 340 (M-740), 13. September 1988 (1988-09-13) & JP 63 101017 A (KAWASAKI STEEL CORP), 6. Mai 1988 (1988-05-06) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010006750A2 (fr) * 2008-07-12 2010-01-21 Sms Siemag Ag Procédé permettant le guidage longitudinal d'un produit laminé, en particulier d'une bande d'acier laminée à chaud, et laminoir à chaud pour la mise en oeuvre de ce procédé
WO2010006750A3 (fr) * 2008-07-12 2010-03-25 Sms Siemag Ag Procédé permettant le guidage longitudinal d'un produit laminé, en particulier d'une bande d'acier laminée à chaud, et laminoir à chaud pour la mise en oeuvre de ce procédé

Also Published As

Publication number Publication date
DE19718530B4 (de) 2005-02-03
ATE255965T1 (de) 2003-12-15
EP0875304B1 (fr) 2003-12-10
EP0875304A3 (fr) 2002-01-02
ES2212167T3 (es) 2004-07-16
DE59810374D1 (de) 2004-01-22
DE19718530A1 (de) 1998-11-12

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