EP0111985A2 - Verfahren zum Abkühlen von dünnen Metallbändern - Google Patents

Verfahren zum Abkühlen von dünnen Metallbändern Download PDF

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Publication number
EP0111985A2
EP0111985A2 EP83201820A EP83201820A EP0111985A2 EP 0111985 A2 EP0111985 A2 EP 0111985A2 EP 83201820 A EP83201820 A EP 83201820A EP 83201820 A EP83201820 A EP 83201820A EP 0111985 A2 EP0111985 A2 EP 0111985A2
Authority
EP
European Patent Office
Prior art keywords
phase
cooling
strip
temperature
intensity
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
EP83201820A
Other languages
English (en)
French (fr)
Other versions
EP0111985B1 (de
EP0111985A3 (en
Inventor
Stéphan Wilmotte
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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
Priority claimed from BE6/47760A external-priority patent/BE895434A/fr
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Priority to AT83201820T priority Critical patent/ATE41789T1/de
Publication of EP0111985A2 publication Critical patent/EP0111985A2/de
Publication of EP0111985A3 publication Critical patent/EP0111985A3/fr
Application granted granted Critical
Publication of EP0111985B1 publication Critical patent/EP0111985B1/de
Expired 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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

Definitions

  • the present invention relates to the forced cooling of thin metal strips, in particular steel. It relates in particular to the cooling operation carried out in the continuous heat treatment lines for thin strips.
  • the strips can, in the final state, present serious defects.
  • the strips may also have vermiculations, that is to say marks of plastic deformation, which appear when the elastic limit of the material is reached for a certain temperature of the product and when the tensile characteristic of the material has a plateau. at this temperature.
  • a first known method consists in applying cooling by air blowing, for which the heat exchange coefficient is approximately 0.15 kW / m 2 ° C. This is a fairly slow cooling, which requires a long period of application and therefore the use of long cooling installations. The consumption of compressed air and the cost of the operation are consequently high.
  • Another cooling method which consists in immersing the thin strip in water maintained at its boiling temperature.
  • the heat exchange coefficient is approximately 0.28 kW / m 2 ° C in the film boiling range, that is to say when the surface temperature of the product is above 300 ° C. Below this temperature, the heat exchange coefficient increases very quickly and cooling by immersion in boiling water does not always make it possible to obtain a flat strip free of vermiculations. In addition, this cooling is also quite slow and has in this respect the same drawbacks as cooling by air blowing.
  • the subject of the present invention is a method making it possible to remedy the drawbacks which have just been mentioned.
  • the method of the invention ensures intense cooling of the strip, while making it possible to obtain a quality product, having excellent flatness and free from vermiculations.
  • the process which is the subject of the present invention, in which a thin metal strip is subjected to cooling sement by spraying a refrigerant, is essentially characterized in that said cooling comprises a phase, called low intensity, during which the heat exchange coefficient defined at 6 00 ° C is less than 3 k W / m 2 ° C , and a phase, called high intensity, during which the heat exchange coefficient defined at 6 00 ° C is greater than 3 kw / m2 ° C.
  • the cooling phase is carried out first at low intensity, until the strip has reached a predetermined temperature, and then the cooling phase at high intensity.
  • an additional cooling phase called an intermediate intensity phase, which is preferably situated between the low intensity phase and the high intensity phase.
  • the strip it has been found to be particularly advantageous to cool the strip by means of jets, for example of water, arranged so as to cover the entire surface of the strip.
  • jets for example of water
  • the water may possibly be hot and / or sprayed in the form of a mist.
  • the difference in intensity being obtained by adjusting the total flow of refrigerant in each phase.
  • This adjustment can be performed by modifying either the number of coolant jets, or the flow rate of the various jets by any means known per se.
  • the strip A moving in the direction of the arrow B is subjected to the action of water jets arranged in staggered rows, of which only the three jets of axis perpendicular to the strip at points C, D and E are shown.
  • Figures 2 to 5 reflect the results obtained by a cooling operation, either only at high intensity (fig. 2 and 3), or only at low intensity (fig. 4 and 5).
  • FIG. 2 shows the curves O to 5 giving the evolution of the heat flux density as a function of the surface temperature of the strip, corresponding respectively to the points O to 5 indicated in FIG. 1. These curves reflect high intensity cooling for which the average heat exchange coefficient is 3.8 kW / m 2 ° C to 600 ° C.
  • FIG. 3 shows the evolution of the stresses of thermal origin, superimposed on the traction in the strip (2 0 N / mm 2 ), as a function of the surface temperature of the strip, still in the case of cooling. at high intensity of FIG. 2. These curves show that it develops in the band, compressive stresses (line passing through point O) and tensile stresses (line passing through point 4). It also appears that the maximum difference between the tensile and compressive stresses is manifested for a temperature of the strip of the order of 300 ° C.
  • This FIG. 3 also shows the evolution of the elastic limit Re of the strip, as a function of its temperature, as well as the point M of the appearance of the bearing in the traction curve.
  • Figure 4 shows the curves reflecting the evolution of the heat flux density as a function of the surface temperature of the strip, respectively at points O to 5 of Figure 1. The difference between the curves also reveals a fairly heterogeneous cooling sensitive, but weaker however than in the case of FIG. 2.
  • Figure 5 shows that the maximum difference between the tensile and compressive stresses is significantly less than in Figure 3. In addition, these stresses at no point exceed the elastic limit of the material. The strips cooled at low intensity therefore do not exhibit any defect in flatness or vermiculations. On the other hand, the cooling length necessary to reach a temperature below 170 ° C is equal to 1.61 m. It is therefore 2.2 times higher than in the case of high-intensity cooling, which leads to an increased total consumption of cooling agent.
  • FIG. 6 shows the evolution of the maximum difference ⁇ between the maximum tensile and compression stresses in the strip, as a function of the interruption temperature of phase I.
  • the points of breakthrough of the axes of the jets of phase II are aligned with those of phase I according to straight lines parallel to the longitudinal axis of the strip.
  • This case is illustrated by curve 1 in FIG. 6.
  • the interruption temperature is less than 300 ° C., it is brought back to the case where the cooling is entirely carried out in phase I; below this temperature of 300 ° C, the value of ⁇ max remains constant and equal to 78 N / mm 2 .
  • An intermediate interruption temperature of 450 ° C leads to a maximum ⁇ of 8 7 N / mm 2 .
  • the jets of phase I I are offset transversely by half a step with respect to those of phase I.
  • This case corresponds to curve 2 of FIG. 6.
  • the points corresponding to temperatures of 750 ° C on the one hand and less than 300 ° C on the other hand, are identical to those of curve 1. It is noted however that when the interruption temperature is between 580 ° C and 300 ° C, the value of ⁇ max is less than the lowest achievable value in the first case (curve 1). For an interruption temperature of 450 ° C, ⁇ max is 56 N / mm 2 .
  • the phases I and I I must have respective lengths of 0.88 m and 0.30 m, ie a total length of 1, 18 m.
  • the method of the invention therefore makes it possible to reduce the duration of cooling, in this case by 27%, and consequently the consumption of refrigerant, compared to low intensity cooling, while avoiding the appearance of flatness defects. and worms in the strips.
  • This value of 78 N / mm 2 corresponds to the lowest value achievable by low intensity cooling (curve 1), - but with a length of 1 m instead of 1.61 m, a reduction of 38%. ''

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Secondary Cells (AREA)
EP83201820A 1982-12-21 1983-12-20 Verfahren zum Abkühlen von dünnen Metallbändern Expired EP0111985B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83201820T ATE41789T1 (de) 1982-12-21 1983-12-20 Verfahren zum abkuehlen von duennen metallbaendern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE6047760 1982-12-21
BE6/47760A BE895434A (fr) 1982-12-21 1982-12-21 Procede de refroidissement de bandes metalliques minces

Publications (3)

Publication Number Publication Date
EP0111985A2 true EP0111985A2 (de) 1984-06-27
EP0111985A3 EP0111985A3 (en) 1985-08-07
EP0111985B1 EP0111985B1 (de) 1989-03-29

Family

ID=3874917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201820A Expired EP0111985B1 (de) 1982-12-21 1983-12-20 Verfahren zum Abkühlen von dünnen Metallbändern

Country Status (3)

Country Link
EP (1) EP0111985B1 (de)
AT (1) ATE41789T1 (de)
DE (1) DE3379508D1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921208A3 (de) * 1997-12-05 2000-01-19 Mitsubishi Heavy Industries, Ltd. Verfahren und Vorrichtung zum Kühlen von bandförmigem Gut
WO2010079452A1 (fr) * 2009-01-09 2010-07-15 Fives Stein Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1151265A (en) * 1966-08-09 1969-05-07 Olin Mathieson Apparatus for the Controlled Cooling of Metal Sheet
BE873060A (fr) * 1978-12-22 1979-06-22 Centre Rech Metallurgique Procede et dispositif de refroidissement accelere de bandes minces
BE880587A (fr) * 1979-12-12 1980-06-12 Centre Rech Metallurgique Installation de traitement thermique en continu de toles d'acier
JPS58120748A (ja) * 1982-01-13 1983-07-18 Nippon Steel Corp 加工用冷延鋼帯および高張力冷延鋼帯の連続熱処理設備
BE895434A (fr) * 1982-12-21 1983-04-15 Centre Rech Metallurgique Procede de refroidissement de bandes metalliques minces

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0921208A3 (de) * 1997-12-05 2000-01-19 Mitsubishi Heavy Industries, Ltd. Verfahren und Vorrichtung zum Kühlen von bandförmigem Gut
US6301920B2 (en) 1997-12-05 2001-10-16 Mitsubishi Heavy Industries, Ltd. Method and system for cooling strip material
US6305176B1 (en) 1997-12-05 2001-10-23 Mitsubishi Heavy Industries, Ltd. Method and system for cooling strip material
US6537374B2 (en) 1997-12-05 2003-03-25 Mitsubishi Heavy Industries, Ltd. Method and system for cooling strip material
WO2010079452A1 (fr) * 2009-01-09 2010-07-15 Fives Stein Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide
FR2940978A1 (fr) * 2009-01-09 2010-07-16 Fives Stein Procede et section de refroidissement d'une bande metallique en defilement par projection d'un liquide
CN102272338A (zh) * 2009-01-09 2011-12-07 法孚斯坦因公司 通过喷射液体对行进中的金属带进行冷却的方法和冷却段
US8918199B2 (en) 2009-01-09 2014-12-23 Fives Stein Method and section for cooling a moving metal belt by spraying liquid

Also Published As

Publication number Publication date
DE3379508D1 (en) 1989-05-03
ATE41789T1 (de) 1989-04-15
EP0111985B1 (de) 1989-03-29
EP0111985A3 (en) 1985-08-07

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