EP0210847A2 - Procédé et dispositif pour le refroidissement de rubans d'acier - Google Patents

Procédé et dispositif pour le refroidissement de rubans d'acier Download PDF

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Publication number
EP0210847A2
EP0210847A2 EP86305721A EP86305721A EP0210847A2 EP 0210847 A2 EP0210847 A2 EP 0210847A2 EP 86305721 A EP86305721 A EP 86305721A EP 86305721 A EP86305721 A EP 86305721A EP 0210847 A2 EP0210847 A2 EP 0210847A2
Authority
EP
European Patent Office
Prior art keywords
cooling
steel strip
cooling liquid
flow
steel
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Withdrawn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
EP86305721A
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German (de)
English (en)
Other versions
EP0210847A3 (fr
Inventor
Makoto C/O Chiba Works Arai
Kuniaki C/O Chiba Works Sato
Yasuhiro C/O Chiba Works Yamaguchi
Isamu C/O Chiba Works Shiota
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 JP60162909A external-priority patent/JPS6223937A/ja
Priority claimed from JP13911586A external-priority patent/JPH0229732B2/ja
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0210847A2 publication Critical patent/EP0210847A2/fr
Publication of EP0210847A3 publication Critical patent/EP0210847A3/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Withdrawn legal-status Critical Current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
    • 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
    • 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

  • This invention relates to a method of cooling steel strips in continuous annealing lines and an apparatus for carrying out the method, and more particularly to a method and an apparatus for effectively cooling steel strips to target temperatures in controlled manner irrespective of change in amount of the steel strips and change in temperature of supplied cooling water due to seasonal factors.
  • Steel strips to be surface-treated or used for deep-drawing are generally subjected to heat-treatment such as heating, soaking and cooling in succession, so called “continuous annealing” after cold rolling in order to give predetermined mechanical properties to the steel strips.
  • furnace installations for continuous annealing have been unavoidably elongated and enlarged to give rise to problems such as construction cost and spaces and in operation which will be explained hereinafter.
  • thermal inertia of the furnaces increases to take much time for varying heat-treatment conditions, and other various problems arise such as serpentine movements of steel strips and heat-buckle.
  • This invention intends to effectively solve the problems particularly in the last cooling stage among the various problems arising with the operation of furnaces at high speeds.
  • cooling methods used for the continuous annealing treatment there have been the gas-jet cooling, roll cooling and immersing cooling, which carry out the cooling by jetting cooled atmosphere gas against steel strips, winding steel strips about rolls in which a cooling medium passes, and immersing steel strips in a cooling bath, respectively.
  • the cooling speed increases in order of the gas-jet cooling, roll cooling and immersing cooling.
  • Japanese Patent Application Publications Nos. 11,931/82 and 11,933/82 disclosed cooling methods wherein a plurality of cooling baths are used controlling supply of the cooling water or spray cooling or mist cooling is combined with immersing cooling to cool steel strips effectively, while furthermore the temperature of the cooling water used for cooling is made as high as possible to use it advantageously as hot water.
  • the immersing cooling is usually used in cooling steel strips from temperatures of the order of 250-300°C at which saturated solid solution carbon scarcely changes to temperatures at which temper color does not occur in the air.
  • the cooling speeds in such an immersing treatment are too fast, it encounters a difficulty as to aging due to solid solution carbon.
  • non-aging material such as very low-carbon added with Nb whose solid solution carbon is previously fixed by a third element. With such a non-aging material, any high cooling speed does not cause any problem. Therefore, it has been expected to increase the cooling speed in the final cooling in order to achieve higher speed operation, higher productivity and higher efficiency.
  • Fig. 1 illustrates variations in heat transfer coefficient when steel strips are cooled in the manner of the prior art.
  • the ordinate indicates the heat transfer coefficient and the abscissa denotes temperature difference between the steel strips and the cooling water.
  • Black points and black triangular points indicate data when the steel strips are fed in parallel directions and vertical directions relative to surfaces of the cooling water.
  • the heat transfer coefficient increases as the temperature difference increases, because steam films scarcely occur on the surfaces of the strips. As the temperature difference further increases, steam films occur violently to separate the cooling water and steel strips by thick steam films which would adversely affect the cooling effect. This tendency is acute in the zone where the temperature difference is larger. As a result, the heat transfer coefficient is lowered as shown in the right hand of Fig. 1.
  • said cooling liquid is forced to flow as steady flows along both surfaces of a steel strip in directions opposite to moving directions of the steel strips.
  • the apparatus for cooling steel strips by means of a cooling liquid comprises flow rectifier plates in opposition to both surfaces of a steel strip to form flow passages between the steel strip and the flow rectifier plates for forcing the cooling liquid through said flow passages, at least one cooling liquid supply port on a downsteam side of the moving steel strip and at least one cooling liquid exhaust port on an upstream side of the moving steel strip.
  • part of the cooling liquid used for cooling the steel* strip is mixed with fresh cooling liquid to control temperature of cooling liquid to be used for cooling by adjusting a mixing ratio of the used and fresh cooling liquids, thereby keeping temperature of the cooled steel strip within a predetermined target temperature range.
  • the apparatus comprises a control system which comprises a thermometer, a flow adjusting valve and a flow meter respectively for the cooling water exhausted from the flow passages, a thermometer, a flow adjusting valve and a flow meter respectively for the cooling water newly supplied to the flow passage, a thermometer for detecting temperature of the steel strip leaving the flow passages, an arithmetic unit for calculating amounts of the exhaust and new cooling waters to be mixed, flow controllers for controlling the flow adjusting valves in response to signals from the arithmetic unit, and a mixer for mixing the exhaust and new cooling waters through the flow adjusting valves.
  • a control system which comprises a thermometer, a flow adjusting valve and a flow meter respectively for the cooling water exhausted from the flow passages, a thermometer, a flow adjusting valve and a flow meter respectively for the cooling water newly supplied to the flow passage, a thermometer for detecting temperature of the steel strip leaving the flow passages, an arithmetic unit for calculating amounts of the exhaust and new cooling waters to
  • Fig. 2 illustrates symbolically the cooling method according to the invention wherein a steel strip S is raised upward.
  • a cooling water W conditioned in a steady flow is supplied onto one side of the steel strip S.
  • the cooling water W is turned downward at a location where it is in contact with the strip to flow in a direction opposite to a moving direction of the strip.
  • the cooling water as a whole is forced to flow opposing to the movement of the steel strip S, thereby eliminating any staying of the cooling water which would occur in the prior art cooling method and rapidly removing or breaking steam films produced on the surfaces of the steel strip. Accordingly, high efficiency cooling of the steel strip can be accomplished.
  • the heat transfer coefficient a is 26,800 Kcal/m 2 ⁇ h ⁇ °C.
  • the heat transfer coefficient is at the most 5,000 Kcal/m 2 ⁇ h ⁇ °C in the cooling method of the prior art which is only less than a fraction of those in the present invention.
  • Fig. 4 illustrates in section a preferred embodiment of the invention whose principal part is shown in the perspective view of Fig. 5.
  • Flow rectifier plates la and lb are arranged on both side of and in parallel with a steel strip S to form a cooling water jacket for introducing a cooling water along both surfaces of the steel strip under rectified or steady condition.
  • Sealing rolls 2a, 2b and 3a and 3b serve to prevent the cooling water from escaping at front and rear ends of the flow rectifier plates.
  • Reference numeral 4b denotes sealing plates provided on both sides of the rectifier plates. These sealing plates are jointed to form sealings at the sides of the rectifier plates, which prevent the cooling water from escaping at the sides of the rectifier plates and at the same time serve to position the rectifier plates in assembling.
  • the rectifier plates are provided with cooling water inlets 5a and 5b and cooling water outlets 6a and 6b.
  • Pressure pumps 7a and 7b supply the cooling water into the water cooling jacket formed by the rectifier plates.
  • Deflector rolls 8 and 9 serve to turn the moving direction of the steel strip S.
  • the cooling water introduced through the inlets 5a and 5b into the jacket formed by the rectifier plates flows in clearances or flow passages formed by the steel strip S and the flow rectifier plates la and lb in directions opposite to the moving direction of the strip S and leaves through the outlets 6a and 6b provided at the other end of the jacket.
  • the effective cooling is achieved by forcing the cooling water through the relatively narrow clearances between the steel strip S and the flow rectifier plates la and lb.
  • Figs. 6-8 illustrate modifications of the cooling apparatus according to the invention.
  • the apparatus shown in Fig. 6 comprises three sets of flow rectifier plates along the moving line of the steel strip S.
  • Apparatuses shown in Figs. 7 and 8 comprise flow rectifier plates arranged in U and W shapes, respectively.
  • the cooling water used for the above treatment was approximately 40 T/h.
  • the temperature of the cooling water on the exit side was about 70°C.
  • the steel strips were uniformly cooled in their width direction by the above cooling treatment. Ununiform cooling and troubles caused by steam films were completely prevented.
  • cooling water of about 60 T/h was required for treating the same amount of steel strips as the above. Therefore, considerable saving of cooling water was accomplished according to the invention.
  • the invention steel strips are cooled with remarkably high efficiency in comparison with the prior art. Accordingly, the treating faculty in the continuous annealing treatment is considerably increased. Moreover, the invention can provide a small-sized cooling apparatus.
  • a leg portion 31c of the U-shaped jacket into which a steel strip is introduced tends to obstruct the flow of the cooling water.
  • This resistance ⁇ h can be calculated by the following equation according to the theory of weir. where ⁇ h is difference in water head (mm), Q is flow rate (m 3 /s), C is coefficient of resistance ( ⁇ 0.6), B is width of jacket (width of weir) and g is acceleration of gravity.
  • the cooling water flows smoothly without obstructing the cooling effect, if the difference h in level between surfaces of water in the legs 31a and 31c is determined to fulfil the following equation.
  • nozzles 36 are preferably provided for assisting the flow of cooling water as shown in Figs. 9 and 10. As shown in Fig. 10, slit nozzles 36 are arranged in the cooling jacket in the moving direction of the strip or somewhat inclined to the strip for jetting cooling water, which will compensate for the pressure loss due to the cooling water jacket.
  • the nozzles 36 are supplied with cooling water through piping 37 by means of a supply pump 8. Although the nozzles 36 are arranged one on each side of the steel strip, a plurality of nozzles may be provided on each side of the strip.
  • the steel strip between deflector rolls 32 in the horizontal portion 31b of the water cooling jacket tends to deform in catenary to cause difference in cooling effect between upper and lower sides of the strip.
  • it is considered to increase the tensile force acting upon the strip to reduce the catenary deformation of the strip.
  • a tensile force has a limitation because too high tensile force causes breakage of the strip.
  • it is effective to incline the horizontal portion of the cooling water jacket as shown in Fig. 9. It is preferable to locate the end of the horizontal portion 31b on the side of the leg 31a higher than the other end on the side of the leg 31b in consideration of the flowing direction of the cooling water.
  • steel strips can be cooled with higher efficiency in comparison with the prior art, thereby enabling the treating capacity of the continuous annealing to be remarkably improved.
  • the temperature of steel strips subjected to the cooling treatment is sometimes changed out of a predetermined temperature with variation in amount or weight of steel strips to be treated and with variation in supplied cooling water temperature, for example, due to seasonal variation.
  • Fig. 11 illustrates the relation between the supplied cooling water temperature and the temperature of cooled steel strips in case of the amount or weight of the steel strips 40 T/h passed through the cooling apparatus. As seen from Fig. 11, the temperature of the cooled steel strips becomes out of the predetermined temperature range when the supplied cooling water temperature is too high or low.
  • Fig. 12 illustrates the result of investigating the relation between the amount or weight of steel strips and the temperature of cooled steel strips in two cases of the cooling water temperature of 40°C and 30°C. It is clearly evident that as the amount of the steel strips increases, the temperature of the cooled steel strips becomes higher and frequently out of the predetermined temperature range.
  • Fig. 13 schematically illustrates a control system together with a cooling apparatus with a cooling jacket.
  • Flow rectifier plates lla and llb form a water cooling jacket 11 for forcedly introducing a cooling water along both surfaces of steel strips under a steady condition.
  • Deflector rolls 12 turn the steel strip in the water cooling jacket 11 which is supplied with the cooling water through a cooling water supply pipe 13.
  • a reservoir 14 for storing the used cooling water is provided with a pump 15.
  • the cooling water is introduced into the water cooling jacket at a supply port provided on a downstream side of a moving passage of the steel strip S and is forced through the water cooling jacket 11 in a direction opposite to a moving direction of the steel strip during which the cooling water cools the steel strip with high efficiency until the cooling water leaves an exhaust port.
  • a part of the cooling water exhausted from the apparatus is circulated to use again for adjusting the temperature of the cooling water.
  • the cooling system comprises a return pipe 16 for circulating the exhausted cooling water, a thermometer 17 for detecting the temperature of the exhausted cooling water, a flow adjusting valve 18 for the circulating water, a flow meter 19 for the circulating water, a fresh cooling water supply pipe 20 including a thermometer 21, a flow adjusting valve 22 and a flow meter 23 for the fresh cooling water, and a thermometer 24 for detecting the temperature of steel strips leaving the cooling apparatus.
  • An arithmetic unit 25 calculates amounts of the circulating and fresh cooling waters to be mixed with each other to obtain cooling water at a predetermined temperature on the basis of data detected by the respective detectors. The calculated results are inputted into flow controllers 26 and 27 whose output adjust openings of the flow adjusting valves 18 and 22, respectively. In this manner, the circulating and fresh waters adjusted in their required amounts are mixed in a mixer 28 to obtain cooling water at a predetermined temperature which is supplied through the supply pipe 13 into the cooling jacket 11.
  • Reference numeral 29 denotes wringer rolls for removing water from steel strips leaving the water jacket.
  • An amount Q of cooling water to be supplied is indicated by amounts Q and Q N of the circulating and fresh cooling waters as follows.
  • Fig. 15 illustrates the relation between the steel strip temperature at exit and amount or weight of steel strips when the cooling water temperature is controlled in the manner above described.
  • the amount or weight of the steel strips to be passed was progressively increased.
  • the temperature of the steel strips at the exit was about to exceed the upper limit of the target temperature 60°C.
  • the ratio of the fresh cooling water to the circulating water was changed to 7.1 T/h to 6.1 T/h to lower the cooling water temperature to 30°C.
  • the temperature of the cooled steel strips lowered to 50°C.
  • the cooling operation was continued.
  • the amount of steel strips became 65 T/h, there was again a tendency of the cooled steel strip temperature to exceed 60°C.
  • the ratio of the fresh cooling water to the circulating water was changed to 11 T/h to 2.2 T/h to lower the cooling water temperature to 20°C.
  • the cooled steel strip temperature lowered to 50°C. Thereafter, the cooled steel strip temperature did not exceed 60°C even when the amount of steel strips was increased to 80 T/h. Even when the amount of steel strips was changed from 20 T/h to 80 T/h, the cooled steel strip temperature at the exit was kept within the target temperature within 50-60°C.
  • the temperature of cooled steel strips in cooling treatment in continuous annealing line can be kept in a predetermined target temperature range without being affected by varying factors such as variation in amount of steel strips.

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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)
EP86305721A 1985-07-25 1986-07-25 Procédé et dispositif pour le refroidissement de rubans d'acier Withdrawn EP0210847A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP60162909A JPS6223937A (ja) 1985-07-25 1985-07-25 連続焼鈍処理における鋼帯の冷却方法および冷却装置
JP162909/85 1985-07-25
JP139115/86 1986-06-17
JP13911586A JPH0229732B2 (ja) 1986-06-17 1986-06-17 Renzokushodonrainniokerukotainoreikyakusochishutsugawaitaonseigyohoho

Publications (2)

Publication Number Publication Date
EP0210847A2 true EP0210847A2 (fr) 1987-02-04
EP0210847A3 EP0210847A3 (fr) 1989-05-10

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ID=26472021

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Application Number Title Priority Date Filing Date
EP86305721A Withdrawn EP0210847A3 (fr) 1985-07-25 1986-07-25 Procédé et dispositif pour le refroidissement de rubans d'acier

Country Status (6)

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EP (1) EP0210847A3 (fr)
KR (1) KR900006694B1 (fr)
AU (1) AU571786B2 (fr)
BR (1) BR8603527A (fr)
CA (1) CA1266602A (fr)
ES (1) ES2000758A6 (fr)

Cited By (4)

* 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
US7645417B2 (en) 2003-12-01 2010-01-12 Arcelor France Method and device for cooling a steel strip
CN101660039B (zh) * 2008-08-25 2011-03-16 鞍钢股份有限公司 一种消除冷轧钢板退火硌印的方法
BE1020401A5 (nl) * 2012-09-19 2013-09-03 Duvel Moortgat Nv Werkwijze en inrichting voor het regelbaar instellen van de temperatuur van een fermenterende vloeistof.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000109A (en) * 1957-12-31 1961-09-19 James B Shaver Cooling tunnel for hot sheet or strip
US3358980A (en) * 1965-01-21 1967-12-19 Inland Steel Co Apparatus for quenching web material
US3410734A (en) * 1965-01-18 1968-11-12 Inland Steel Co Quench system
FR2261816A1 (fr) * 1974-02-21 1975-09-19 Pechiney Aluminium
JPS54162614A (en) * 1978-06-15 1979-12-24 Nippon Kokan Kk <Nkk> Continuously water hardening and annealing method
JPS5711931B2 (fr) * 1976-11-18 1982-03-08
EP0065577A1 (fr) * 1980-11-27 1982-12-01 Kawasaki Steel Corporation Appareil de refroidissement rapide continu d'une plaque d'acier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2503187A1 (fr) * 1981-03-31 1982-10-08 Cables De Lyon Geoffroy Delore Procede et dispositif de recuit et de trempe au defile pour elements metalliques allonges en aciers fins ou speciaux
JPS61217530A (ja) * 1985-03-22 1986-09-27 Kawasaki Steel Corp 連続熱処理における鋼帯の冷却方法
JPS61217531A (ja) * 1985-03-22 1986-09-27 Kawasaki Steel Corp 鋼帯の冷却方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000109A (en) * 1957-12-31 1961-09-19 James B Shaver Cooling tunnel for hot sheet or strip
US3410734A (en) * 1965-01-18 1968-11-12 Inland Steel Co Quench system
US3358980A (en) * 1965-01-21 1967-12-19 Inland Steel Co Apparatus for quenching web material
FR2261816A1 (fr) * 1974-02-21 1975-09-19 Pechiney Aluminium
JPS5711931B2 (fr) * 1976-11-18 1982-03-08
JPS54162614A (en) * 1978-06-15 1979-12-24 Nippon Kokan Kk <Nkk> Continuously water hardening and annealing method
EP0065577A1 (fr) * 1980-11-27 1982-12-01 Kawasaki Steel Corporation Appareil de refroidissement rapide continu d'une plaque d'acier

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 22 (C-74), 23rd February 1980, page 128 C 74; & JP-A-54 162 614 (NIPPON KOKAN K.K.) 24-12-1979 *

Cited By (4)

* 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
US7645417B2 (en) 2003-12-01 2010-01-12 Arcelor France Method and device for cooling a steel strip
CN101660039B (zh) * 2008-08-25 2011-03-16 鞍钢股份有限公司 一种消除冷轧钢板退火硌印的方法
BE1020401A5 (nl) * 2012-09-19 2013-09-03 Duvel Moortgat Nv Werkwijze en inrichting voor het regelbaar instellen van de temperatuur van een fermenterende vloeistof.

Also Published As

Publication number Publication date
BR8603527A (pt) 1987-03-04
KR870001317A (ko) 1987-03-13
ES2000758A6 (es) 1988-03-16
AU6050186A (en) 1987-01-29
CA1266602A (fr) 1990-03-13
EP0210847A3 (fr) 1989-05-10
AU571786B2 (en) 1988-04-21
KR900006694B1 (ko) 1990-09-17

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