WO2014065623A1 - Batch type annealing thermal processing facility and method of manufacturing steel plate by using the facility - Google Patents

Batch type annealing thermal processing facility and method of manufacturing steel plate by using the facility Download PDF

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Publication number
WO2014065623A1
WO2014065623A1 PCT/KR2013/009556 KR2013009556W WO2014065623A1 WO 2014065623 A1 WO2014065623 A1 WO 2014065623A1 KR 2013009556 W KR2013009556 W KR 2013009556W WO 2014065623 A1 WO2014065623 A1 WO 2014065623A1
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WO
WIPO (PCT)
Prior art keywords
steel plate
facility
furnace
annealing
heat treatment
Prior art date
Application number
PCT/KR2013/009556
Other languages
English (en)
French (fr)
Inventor
Hyoung Ki Han
Won Bai Cho
Original Assignee
Sac Co., Ltd.
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 Sac Co., Ltd. filed Critical Sac Co., Ltd.
Priority to CN201380055761.0A priority Critical patent/CN104769137A/zh
Publication of WO2014065623A1 publication Critical patent/WO2014065623A1/en

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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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • 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
    • F27D19/00—Arrangements of controlling devices
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals

Definitions

  • the present invention disclosed herein relates to a batch type annealing heat treatment facility and a method of manufacturing a steel plate by using the facility.
  • heat treatment processes performed to satisfy desired properties of steel plates may be largely classified into a continuous annealing line (CAL) continuously performing thermal processes by unwinding coils, a continuous annealing pickling line (APL) performed to satisfy desired pickling properties of stainless steel plates, and a batch type annealing heat treatment process performing a thermal treatment while coils are being wound.
  • CAL continuous annealing line
  • APL continuous annealing pickling line
  • a batch type annealing heat treatment process performing a thermal treatment while coils are being wound.
  • the CAL is appropriate for mass production of plates due to short processing times. However, a lot of facility investment costs are consumed. Also, a scope of used material is limited and it is necessary to highly integrate a heat treatment technology.
  • the batch type annealing heat treatment process may be performed in a small space and facility investment costs thereof are small.
  • a scope of used material is wide and it is easy to expand use thereof.
  • improvement of processability of final materials is necessary.
  • batch type annealed products have been more widely applied in addition to CAL materials.
  • the present invention provides a batch type annealing heat treatment facility capable of reducing energy and a method of manufacturing a steel plate by using the facility.
  • the present invention also provides a batch type annealing heat treatment facility with no danger of explosion and a method of manufacturing a steel plate by using the facility.
  • the present invention also provides a batch type annealing heat treatment facility for forming an oxidation film and a method of manufacturing a steel plate by using the facility.
  • the present invention also provides a batch type annealing heat treatment facility capable of increasing productivity and a method of manufacturing a steel plate by using the facility.
  • the present invention also provides a batch type annealing heat treatment facility with no need for a fluid fan and a method of manufacturing a steel plate by using the facility.
  • Embodiments of the present invention provide batch type annealing heat treatment facilities including a furnace body having an annealing space and an open top, a pedestal member installed on a bottom surface of the furnace body, the pedestal member on which steel plate coils are disposed, a cover for opening and closing the open top of the furnace body, and combustors installed on sides of the furnace body to heat the annealing space.
  • the combustors may be installed on the sides of the furnace body, facing each other, to be opposite to one another.
  • the facility may further include a controller for controlling the combustors to alternately combust.
  • the facility may further include a cooling member to cool down a temperature of an ambient gas of the annealing space.
  • the cooling member may include a circulation duct whose both ends are connected to the furnace body, a heat exchanger installed on the circulation duct and cooling down the ambient gas flowing through the circulation duct, and a circulation fan installed on the circulation duct.
  • the heat exchanger may be a cooler using cool water as a coolant.
  • the facility may further include a concentration controlling unit for controlling the concentration of oxygen in the annealing space.
  • the concentration controlling unit may include an air supplying line for supplying the air into the annealing space and a nitrogen supplying line for supplying nitrogen into the annealing space.
  • the facility may include a sealing member installed on the furnace body.
  • the sealing member may include a sealing frame installed along an edge of a top surface of the furnace body and filled with seal water. An edge of the cover may be dipped into the seal water of the sealing frame.
  • the sealing member may further include a cooler for cooling down the seal water.
  • the pedestal member may be disposed to be perpendicular to an axial direction of the steel plate coil on a plane.
  • the combustors may be installed on the sides of the furnace body with intervals greater than a width of the steel plate coil to allow flames not to be in direct contact with the steel plate coils disposed on the pedestal member.
  • methods of manufacturing a steel plate include a rolling operation in which a steel plate is hot-rolled and wound to be a steel plate coil and an annealing heat treatment operation in which an oxidation film is formed on a surface of the steel plate coil on a furnace of an ambient gas including oxygen and nitrogen gases.
  • the steel plate coil may be loaded onto the furnace for the annealing heat treatment operation as being heated in the rolling operation while passing from the rolling operation to the annealing heat treatment operation.
  • the annealing heat treatment operation may include directly heating the ambient gas inside the furnace by using combustors installed penetrating the furnace.
  • the annealing heat treatment operation may include alternately combusting the ambient gas inside the furnace to be forced to flow by using the combustors.
  • the annealing heat treatment operation may include controlling the concentration of oxygen in the ambient gas by supplying the air when the concentration of oxygen in the ambient gas becomes lower and supplying a nitrogen gas or reducing an amount of the air to be supplied when the concentration of oxygen inside the ambient gas becomes higher.
  • the annealing heat treatment operation may include a first temperature increase of increasing a temperature inside the furnace to a first temperature value before inserting the steel plate coil, a second temperature increase of increasing the temperature inside the furnace to an annealing temperature value after inserting the steel plate coil, a maintenance of maintaining the temperature inside the furnace as the annealing temperature, and a cooling down of cooling down the temperature inside the furnace.
  • the cooling down may include forcing the ambient gas inside the furnace to circulate through a circulation duct on which a heat exchanger is installed.
  • the present invention provides a batch type annealing heat treatment facility capable of reducing energy and a method of manufacturing a steel plate by using the facility.
  • FIG. 1 is a perspective view illustrating a batch type annealing heat treatment facility according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view illustrating the batch type annealing heat treatment facility of FIG. 1;
  • FIG. 3 is a configuration view illustrating a heating unit
  • FIG. 4 is a top view illustrating a furnace body
  • FIG. 5 is a view illustrating a concentration controlling unit
  • FIG. 6 is a view illustrating a sealing member of the furnace body.
  • FIG. 7 is a graph illustrating changes of a temperature in the furnace and a temperature of a steel plate coil during an annealing heat treatment operation.
  • FIG. 1 is a perspective view illustrating a batch type annealing heat treatment facility 10 according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating the batch type annealing heat treatment facility 10.
  • FIG. 3 is a configuration view illustrating a heating unit 200.
  • FIG. 4 is a top view illustrating a furnace body 110.
  • the batch type annealing heat treatment facility 10 is an annealing facility to artificially form an oxidation film on a surface of a steel plate coil C.
  • the batch type annealing heat treatment facility 10 includes a furnace 100, the heating unit 200, a cooling member 300, a concentration controlling unit 400, and a cover transfer unit 800.
  • the furnace 100 includes the furnace body 110 and a cover 120.
  • the furnace body 110 is formed as a box including an insulating wall formed of fireproof bricks and an outer wall surrounding the insulating wall. An open top of the furnace body 110 is covered by the cover 120, thereby sealing an annealing space A therein.
  • the furnace body 110 may be provided as a box including a bottom 112, a left side 113, a right side 114, a front 115, and a rear 116.
  • the furnace body 110 includes an exhaustion line 190 and a damper 192 installed on a bottom of one side surface and may control furnace pressure by using the damper 190.
  • the cover 120 is transferred by the cover transfer unit 800.
  • the cover transfer unit 800 includes a grabbing member 810 grabbing the cover 120 and a crane 820 moving back and forth in a direction X.
  • a pedestal member 150 on which the steel plate coils C are disposed is provided on the bottom 112 of the furnace body 110.
  • the pedestal member 150 is provided as a shape for reducing deformation of the steel plate coil C, which may occur while annealing heat treatment is being performed.
  • the pedestal member 150 includes a base plate 152 installed on the bottom 112 of the furnace body to be fastened and three skids 154 provided on the base plate 152 left and right in a direction Y.
  • the skids 154 each includes two slant supporting surfaces 156 extended laterally from a center.
  • the steel plate coil C is mounted on the two slant supporting surfaces 156.
  • the pedestal 150 has heat-resisting corrosion-resisting properties by using heat-resisting steel.
  • the heating unit 200 is mounted on the furnace 100 to uniformly maintain the annealing space A to be at an annealing temperature.
  • the heating unit 200 includes a first combustor group 210a, a second combustor group 210b, and a controller 240 controlling the first and second combustor groups 210a and 210b.
  • the first combustor group 210a and the second combustor group 210b may be formed of four combustors 202 as one group, respectively.
  • the first combustor group 210a and the second combustor group 210b are provided on the left side 113 and the right side 114 to face each other.
  • the respective combustors 202 are installed horizontally to penetration holes formed in the furnace body 110.
  • first combustor group 210a and the second combustor group 210b may be disposed on the left side 113 and the right side 114, in which totally four combustors 202 may be disposed to face one another while two combustors 202 are on top and bottom, respectively.
  • a horizontal interval L1 between the combustors 202 may be wider than a width L2 of the steel plate coil C loaded on the furnace body 110 not to allow flames of the combustors 202 to be in direct contact with the steel plate coil C.
  • the controller 240 may control the first combustor group 210a and the second combustor group 210b to allow the combustors 202 to sequentially alternately combust.
  • the controller 240 may determine a desired number of operated combustors 202 depending on an output value automatically set according to a control temperature deviation. A unique number is given to each of the combustors 202. An order of operating the combustors 202 may be determined in such a way that one of the combustors 202 located farther may be sequentially operated earlier than others.
  • the combustors 202 of the first combustor group 210a alternately combust in an order of A1-A4-A2-A3 while the combustors 202 of the second combustor group 210b may be alternately combusting in an order of B4-B1-B3-B2.
  • the operation time and turn over time of the combustors 202 may vary with an operation expression applied to the controller 240. Basically, the combustors 202 may operate for a short time within a range from about several seconds to about several ten seconds.
  • the heating unit 200a allows the combustors 202 of the first combustor group 210a and the second combustor group 210b to alternately combust due to the controller 240, thereby fully generating a fluid flow in the annealing space A in the furnace body 110.
  • the velocity of a nozzle portion on which flames are formed may be higher than 120 m/sec. Due to the alternate combustion of the combustors 202 and high velocity of the nozzle portions of the combustors 202, uniform temperature distribution and convection occur without an additional fluid fan and smoothly circulate through between the steel plate coils C, thereby forming a uniform oxidation film.
  • the combustors 202 each has a heat exchange structure therein, thereby increasing combustion efficiency and keeping down increase of a temperature around the furnace body 110 by injecting the air at a room temperature.
  • the cooling member 300 is provided to decrease a temperature of the annealing space A, which is a temperature of an ambient gas.
  • the cooling member 300 includes circulation duct 310 whose both ends are connected to the furnace body 110, a heat exchanger 320 installed on the circulation duct 310 and keeping down a temperature of an ambient gas flowing through the circulation duct 310, and a circulation fan 330 installed on the circulation duct 310.
  • the heat exchanger 320 may be a cooler using cooling water as a coolant.
  • one end of the circulation duct 310 which is an ambient gas outlet, may be connected to a top end of the front of the furnace body 110 and another end thereof, which is an ambient gas inlet, may be connected to a bottom end of the front of the furnace body 110.
  • the concentration controlling unit 400 is provided to control a concentration of oxygen O2 in the annealing space A.
  • the concentration controlling unit 400 may include an air supplying line 410 supplying the air into the annealing space A and a nitrogen supplying line 420 supplying nitrogen into the annealing space A.
  • an amount of supplied air is increased when a concentration of oxygen in the ambient gas decreases.
  • a nitrogen gas is supplied or the amount of supplied air is reduced, thereby controlling the concentration of oxygen in the ambient gas.
  • the batch type annealing heat treatment facility 10 since the concentration of oxygen in the annealing space A is automatically controlled by nitrogen-mixed combustion to provide adequate oxidized-surface quality, the batch type annealing heat treatment facility 10 does not need a brilliant ambient gas formed by mixing nitrogen with oxygen, which is generally necessary.
  • the concentration controlling unit 400 may include a concentration measurer checking the concentration of oxygen in the annealing space A and a valve controller for controlling valves installed the air supplying line 410 and the nitrogen supplying line 420 according to a value measured by the concentration measurer.
  • FIG. 6 is a view illustrating a sealing member 170 of the furnace body 100.
  • the sealing member 170 is installed on the top end of the furnace body 110.
  • the sealing member may include a sealing frame 172 installed along an edge of a top surface of the furnace 110.
  • the sealing frame 170 is filled with seal water.
  • an edge 128 of the cover 120 is dipped into the seal water of the sealing frame 172, thereby maintaining a seal.
  • the sealing member 170 may include a circulation line 174 and a valve 179 installed on the circulation line 174. The valve 179 is used to prevent an overflow phenomenon of the seal water supplied to the sealing frame 172.
  • a method of treating a steel plate by using the batch type annealing heat treatment facility configured as described above will be described as follows.
  • the method of treating the steel plate largely includes a rolling operation of hot rolling and winding a steel plate to be a coil and an annealing heat treatment operation.
  • the steel plate coil C is heated to a rolling temperature.
  • the steel plate coil C passing through the rolling operation is transferred to the batch type annealing heat treatment facility 10 for the annealing heat treatment operation.
  • the steel plate coil C is heated to a temperature from about 1000 to about 1200°C in the rolling operation and then is transferred to the batch type annealing heat treatment facility 10 while being not yet cooled down.
  • the steel plate coil C is maintained as being at a high temperature, for example, from about 600 to about 750°C. Accordingly, since the steel plate coil C is loaded in the furnace 100 in the annealing heat treatment operation, energy and time used to increase a temperature of the furnace 100 may be reduced.
  • annealing heat treatment operation there is performed annealing treatment for forming an oxidation film on a surface of the steel plate coil C on the furnace 100 of the ambient gas including oxygen and nitrogen gases.
  • FIG. 7 is a graph illustrating changes of the temperature in a furnace and a temperature of a steel plate coil in the annealing heat treatment operation.
  • the annealing heat treatment operation is largely divided into a first temperature increase T1, a second temperature increase T2, temperature maintenance T3, and cooling down T4, in which treatment conditions such as a temperature and time for each process may be changed according to an amount of the steel plate coil to be treated.
  • a temperature inside the furnace is primarily increase fast before inserting the steel plate coil.
  • a first temperature value may be higher than an annealing temperature that is 850°C.
  • the temperature inside the furnace is controlled to be the annealing temperature after inserting the steel plate coil.
  • the temperature maintenance T3 the temperature inside the furnace is maintained for a certain time.
  • the cooling down T4 in which the temperature inside the furnace is gradually cooled down is performed.
  • the temperature inside the furnace is gradually cooled down by using a cooling member.
  • a plurality of combustors installed while penetrating the furnace directly heat an ambient gas inside the furnace and alternately combust to force the ambient gas inside the furnace to flow. That is, in the annealing heat treatment operation, a batch type annealing heat treatment facility operates two combustor groups formed of four combustors as one group, respectively. That is, the combustors of the respective combustor groups alternately operate with certain periods, in which a combustor, which does not operate, functions as an exhaustion path of a combustion gas generated by an operating combustor.
  • the air is supplied when the concentration of oxygen in an ambient gas becomes lower and a nitrogen gas is supplied or an amount of the air to be supplied is reduced when the concentration of oxygen in the ambient gas, thereby controlling the concentration of oxygen in the ambient gas.
  • annealing heat treatment is performed without cooling down a steel plate coil to a room temperature after hot rolling, thereby reducing energy.
  • an oxidation film is artificially formed on a surface of the steel plate coil by controlling the concentration of oxygen in a furnace by using nitrogen-mixed combustion, which is free from a danger of explosion.
  • an edge loss insoluble while brilliant annealing is being performed may be solved, an edge loss may be reduced, thereby increasing productivity.

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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)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
PCT/KR2013/009556 2012-10-26 2013-10-25 Batch type annealing thermal processing facility and method of manufacturing steel plate by using the facility WO2014065623A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380055761.0A CN104769137A (zh) 2012-10-26 2013-10-25 批式退火热处理设备和使用该设备制造钢板的方法

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KR1020120119707A KR101253703B1 (ko) 2012-10-26 2012-10-26 배치식 소둔 열처리 설비
KR10-2012-0119707 2012-10-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019215132A1 (en) * 2018-05-08 2019-11-14 Tata Steel Ijmuiden B.V. Steel strip, sheet or blank having improved formability and method to produce such strip

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101917441B1 (ko) 2016-12-15 2018-11-09 주식회사 포스코 압연설비
JP6952197B2 (ja) * 2017-09-20 2021-10-20 宝鋼湛江鋼鉄有限公司Ｂａｏｓｔｅｅｌ Ｚｈａｎｊｉａｎｇ Ｉｒｏｎ ＆ Ｓｔｅｅｌ Ｃｏ．， Ｌｔｄ． 固定式熱間コイル保温熱処理装置
KR200490344Y1 (ko) * 2018-06-08 2019-10-31 두산중공업 주식회사 열처리 설비의 부품 수명 모니터링 및 점검주기 알림시스템
KR102046150B1 (ko) * 2019-06-05 2019-11-18 윤귀태 소둔로 및 그를 이용한 소둔 처리방법
KR102394864B1 (ko) * 2020-07-21 2022-05-04 현대제철 주식회사 가열로 밀봉장치

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JPH07113580A (ja) * 1993-10-18 1995-05-02 Tokyo Gas Co Ltd 加熱炉
JPH0813123A (ja) * 1994-06-28 1996-01-16 Sumitomo Metal Ind Ltd 竪型バッチ式窒化炉
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JPH03294434A (ja) * 1990-04-12 1991-12-25 Kawasaki Steel Corp バッチ式コイル焼鈍炉
JPH07113580A (ja) * 1993-10-18 1995-05-02 Tokyo Gas Co Ltd 加熱炉
JPH0813123A (ja) * 1994-06-28 1996-01-16 Sumitomo Metal Ind Ltd 竪型バッチ式窒化炉
KR100431802B1 (ko) * 1999-12-15 2004-05-17 주식회사 포스코 가공성이 우수한 열연박판 제조방법

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Publication number Priority date Publication date Assignee Title
WO2019215132A1 (en) * 2018-05-08 2019-11-14 Tata Steel Ijmuiden B.V. Steel strip, sheet or blank having improved formability and method to produce such strip

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CN104769137A (zh) 2015-07-08

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