KR100368263B1 - A Descaling Method of Hot Rolled Steel Sheet - Google Patents
A Descaling Method of Hot Rolled Steel Sheet Download PDFInfo
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- KR100368263B1 KR100368263B1 KR10-1999-0062485A KR19990062485A KR100368263B1 KR 100368263 B1 KR100368263 B1 KR 100368263B1 KR 19990062485 A KR19990062485 A KR 19990062485A KR 100368263 B1 KR100368263 B1 KR 100368263B1
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- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000005098 hot rolling Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 10
- 238000005096 rolling process Methods 0.000 abstract description 10
- 239000000498 cooling water Substances 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 5
- 238000007796 conventional method Methods 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/08—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 de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
본 발명은 폭방향 온도편차 저감형 고압수 탈스케일 방법에 관한 것이며, 그 목적하는 바는 열연 공정의 조압연 및 사상압연에 설치된 탈스케일 설비에서 폭방향 에지부의 냉각수량을 감소시키면서 동일한 충돌압을 유지할 수 있도록 헤더에서의 냉각수량을 피드백 제어할 수 있는 탈스케일 시스템을 이용하여 열연판 폭방향 충돌압분포가 균일하고 열연판 표면온도편차를 저감시킴으로써, 재질편차 및 에지부에 발생되는 박리 용이형 스케일로 인한 러스트 발생 등의 표면결함을 해소시킬 수 있는 방법을 제공하고자 하는데 있다.The present invention relates to a high-pressure water descaling method for reducing the widthwise temperature deviation, and an object thereof is to reduce the amount of cooling water in the widthwise edge portion in a descaling facility installed in rough rolling and finishing rolling in a hot rolling process. By using a descale system that can feedback-control the amount of cooling water in the header so that it can be maintained, the hot-rolled plate widthwise impact pressure distribution is uniform and the hot-rolled plate surface temperature deviation is reduced, so that it is easy to peel off the material deviation and edges. An object of the present invention is to provide a method for eliminating surface defects such as rust caused by scale.
상기의 목적을 달성하기 위한 본 발명은 고압수 헤드를 2개이상의 노즐이 치부될 수 있을 정도의 길이로 세분시키고, 각각의 세분된 헤더에는 고압수가 공급될 때 압력조절이 가능한 솔레노이드식 압력조절밸브와 플렉시블한 고압수용 호스로 펌프와 연결되어 있으며, 조업시 상기 세분된 헤더의 높이와 헤더의 압력(P)은 P(bar)= 헤드높이(H)1.480+ 36.7와 같은 수학식에 의해 ±10%의 공차를 갖도록 하여 폭방향으로 충돌압력을 제어함을 특징으로 하는 폭방향 온도편차 저감형 고압수 탈스케일 방법에 관한 것을 그 요지로 한다.In order to achieve the above object, the present invention subdivids the high pressure water head into a length such that two or more nozzles can be attached, and each subdivided header is a solenoid pressure regulating valve capable of regulating pressure when high pressure water is supplied. And flexible high pressure water hose is connected to the pump. During operation, the subdivided header height and header pressure (P) are ± 10 by the following equation: P (bar) = head height (H) 1.480 + 36.7 It is an object of the present invention to provide a method for reducing the widthwise temperature deviation type high-pressure water descaling, characterized in that the collision pressure is controlled in the width direction with a tolerance of%.
Description
본 발명은 코일의 에지(edge)부에 발생되는 러스트(rust) 표면결함 및 재질편차가 없는 고품질의 열연강판을 제조하기 위해서 열간압연 공정에서 조압연 및 사상압연전 열연판에 형성된 스케일(scale)을 고압수를 이용하여 제거시킴과 동시에 폭방향으로 고압수량의 조절이 가능한 탈스케일 방법을 채용하여 균일한 표면온도분포를 균일화 함으로써 스케일 제거능력이 우수하면서 열연 스케일 제거 및 재질편차를 저감시키는 방법에 관한 것이다.The present invention is a scale formed in the hot rolling before rough rolling and finishing rolling in the hot rolling process in order to produce a high quality hot rolled steel sheet without rust surface defects and material deviations generated in the edge portion of the coil Method to remove hot rolled scale and reduce material deviation by adopting the descale method that can remove high pressure water and control high pressure water in the width direction and equalize even surface temperature distribution. It is about.
열간압연 공정의 가열로에서 재가열된 압연재의 표면에는 1차 스케일이 생성되며 열간압연 공정 중에서는 시간 경과에 따라 압연재 표면에 2차 스케일이 형성된다. 스케일이 미박리된 열간강판을 압연하면 스케일이 열연판 표면에 압입되어 제품표면결함을 유발시킨다. 그러므로 일관 제철소 열간압연공정에서 스케일 결함이 없는 제품을 생산하기 위해서 조압연기 입·출측 및 사상압연기 입측에 탈스케일 (descaling)장치를 사용하고 있다.The primary scale is formed on the surface of the reheated rolling material in the heating furnace of the hot rolling process, and the secondary scale is formed on the surface of the rolling material over time during the hot rolling process. Rolling a hot unrolled hot steel sheet causes the scale to press into the hot rolled sheet surface causing product surface defects. Therefore, descaling equipment is used at the entry and exit of the rough mill and the finishing mill in order to produce products without scale defects in the integrated steel mill hot rolling process.
종래의 탈스케일 장치의 작동방법으로는 100-200kgf/cm2의 고압수를 열연강판 표면에 분사시켜 급냉효과를 이용하여 스케일과 열연판 기지조직간의 열응력을 발생시켜 스케일에 수직크랙(crack)을 유발시킨 후 고압수 압력에 의해 불려나가게 하는 방법, 압연재를 압축변형시켜 스케일을 제거하는 방법, 열연판 표면에 쇼트(shot)를 분사 충돌시켜 스케일을 제거하는 방법, 롤레벨러(roll leveller) 등의 기계를 이용하여 열연판 표면변형을 부여하여 스케일을 제거하는 방법(일본국 특허공보 소(昭)57-36013), 그리고 브러쉬롤(Brush Roll)을 사상 압연기 이전에 설치하여 열연판 표면을 브러쉬하여 미박리된 스케일을 제거하는 방법(일본국특허공보 소62-34618, 특허공보 평(平)3-106510) 등이 있다.In the conventional method of descaler, 100-200kgf / cm 2 high pressure water is sprayed on the surface of hot-rolled steel sheet to generate thermal stress between scale and hot-rolled sheet matrix by using quenching effect. Method to remove the scale by compressing and deforming the rolled material, removing the scale by spraying shots on the surface of the hot-rolled sheet, roll leveler Method to remove scale by imparting surface deformation of hot rolled sheet using a machine such as Japanese Patent Publication No. 57-36013, and brush roll before the finishing mill. There is a method of brushing to remove the unpeeled scale (Japanese Patent Laid-Open No. 62-34618, Japanese Patent Application Laid-Open No. 3-106510).
통상, 고압수를 분사시켜 스케일을 제거하는 경우가 별도의 기계적 장치의 보완이 필요없을 뿐 아니라 관리 및 유지비가 저렴하므로 현재 가장 보편적으로 사용되고 있다. 하지만, 고압수분사용 노즐(nozzle)에 의해 분사되는 고압수의 분사패턴 (pattern)을 일정간격으로 중첩(overlap)시켜 열연판의 전체 폭에 균일한 고압수 충돌압이 얻어지도록 설계(일본국 특허공보 소52-142047, 특허공보 소62-47086, 특허공보 평1-2789007)되었으나 열연 바(bar)재의 에지부는 자연냉각에 의하여 냉각이 가장 빠른 부분이며 폭방향 센터부위와 동일한 냉각수량을 분사시켜도 빠른 냉각속도로 냉각되어 폭방향 센터부와 서로 다른 스케일 조성을 가지며 에지부의 과냉으로 낮은 온도 상태로 열간압연됨으로써 폭방향으로 재질편차를 유발시킬 수 있다.In general, the case of removing the scale by spraying high-pressure water is not the need for a supplement of a separate mechanical device, as well as the management and maintenance costs are cheaply used at present. However, it is designed to obtain a uniform high pressure water collision pressure over the entire width of the hot rolled sheet by overlapping the injection pattern of the high pressure water sprayed by the high pressure water injection nozzle at regular intervals (Japanese Patent) 52-142047, Patent Publication No. 62-47086, and Patent Publication No. Hei 1-2789007), but the edge of the hot rolled bar material is the fastest cooling part by natural cooling, and even if the same amount of cooling water is injected as the width center part, It is cooled at a high cooling rate and has a different scale composition from the width direction center part, and hot rolling is performed at a low temperature state by supercooling the edge part, thereby causing material deviation in the width direction.
본 발명은 상기와 같은 종래기술의 문제점을 해소하기 위해서 안출된 것으로서, 열연 공정의 조압연 및 사상압연에 설치된 탈스케일 설비에서 폭방향 에지부의 냉각수량을 감소시키면서 동일한 충돌압을 유지할 수 있도록 헤더에서의 냉각수량을 피드백 제어할 수 있는 탈스케일 시스템을 이용하여 열연판 폭방향 충돌압분포가 균일하고 열연판 표면온도편차를 저감시킴으로써, 재질편차 및 에지부에 발생되는 박리 용이형 스케일로 인한 러스트 발생 등의 표면결함을 해소시킬 수 있는 방법을 제공하고자 하는데, 그 목적이 있다.The present invention has been made to solve the problems of the prior art as described above, in the descaling equipment installed in the rough rolling and finishing rolling of the hot rolling process in the header to reduce the amount of cooling water in the widthwise edge portion in the header Hot rolled plate width direction impingement pressure distribution is uniform and the hot rolled plate surface temperature deviation is reduced by using a descaling system that can feedback control the amount of cooling water. It is to provide a method that can eliminate the surface defects, such as, the purpose is.
도 1은 본 발명에 따른 탈스케일 방법의 개략구성도1 is a schematic configuration diagram of a descale method according to the present invention
도 2는 종래기술과 본 발명에 따른 열연판 표면층 미세조직사진Figure 2 is a hot rolled plate surface layer microstructure photograph according to the prior art and the present invention
도 3은 종래기술과 본 발명에 따른 열연코일 에지부 표면결함을 보이는 사진Figure 3 is a photograph showing the surface defects of the hot rolled coil edge according to the prior art and the present invention
* 도면의 주요부분에 대한 부호 설명 *Explanation of symbols on the main parts of the drawings
1: 열연판 2: 고압수노즐1: hot rolled sheet 2: high pressure water nozzle
3: 고압수헤더 4: 솔레노이드식 압력조절밸브3: high pressure water header 4: solenoid pressure regulating valve
5: 원격제어장치 6: 고압용 플렉스블호스5: Remote Control Unit 6: High Pressure Flexible Hose
H: 분사노즐∼열연판의 수직거리 S: 분사각도H: Vertical distance of the spray nozzle to the hot rolled sheet S: Spray angle
상기의 목적을 달성하기 위한 본 발명은 고압수 헤드를 2개이상의 노즐이 치부될 수 있을 정도의 길이로 세분시키고, 각각의 세분된 헤더에는 고압수가 공급될 때 압력조절이 가능한 솔레노이드식 압력조절밸브와 플렉시블(flexible)한 고압수용 호스로 펌프와 연결되어 있으며, 조업시 상기 세분된 헤더의 높이와 헤더의 압력(P)은 P(bar)= 헤드높이(H)1.480+ 36.7와 같은 수학식에 의해 ±10%의 공차를 갖도록 하여 폭방향으로 충돌압력을 제어함을 특징으로 하는 폭방향 온도편차 저감형 고압수 탈스케일 방법에 관한 것이다.In order to achieve the above object, the present invention subdivids the high pressure water head into a length such that two or more nozzles can be attached, and each subdivided header is a solenoid pressure regulating valve capable of regulating pressure when high pressure water is supplied. And flexible high pressure water hose connected to the pump, and during operation, the height of the subdivided header and the pressure (P) of the header are expressed in the following equation: P (bar) = head height (H) 1.480 + 36.7 The high pressure water descaling method of the widthwise temperature deviation reduction control method characterized in that the impingement control in the width direction by having a tolerance of ± 10%.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
본 발명은 폭방향으로 균일한 충돌압력을 유지하면서 펌프 압력 저하에 따른 고압수량의 감소로 에지부의 온도 감소를 저감시킬 수 있는 고압수 탈스케일 방법에 관한 것으로, 기존의 고압수 헤드를 2개이상의 노즐이 치부될 수 있을 정도로 세분시켜 각각의 세분된 헤드를 제어하는 것이다. 상기 노즐을 하나의 세분된 헤더에 2개이상씩 치부하는 이유는 분사시 중첩부위를 형성하기 위해서 이다.The present invention relates to a high-pressure water descaling method that can reduce the temperature decrease of the edge portion by reducing the amount of high pressure water in accordance with the lowering of the pump pressure while maintaining a uniform impact pressure in the width direction. Each subdivision of the head is controlled by subdividing the nozzle so that it can be toothed. The reason why two or more nozzles are attached to one subdivided header is to form an overlapping portion during spraying.
본 발명에 따른 탈스케일 방법의 일예를 도면을 이용하여 설명하면 다음과 같다.An example of a descale method according to the present invention will be described with reference to the drawings.
즉, 도 1에서와 같이, 본 발명에 따른 열연강판(1)의 표면스케일 제거장치는 2개씩의 노즐이 치부될 수 있는 길이로 세분된 원통형의 고압수헤더(3)에 고압수노즐(2)이 배열되어 있다. 각각의 세분된 고압수헤더(3)는 고압수분사노즐(2)에서 열연판(1) 표면 간의 수직거리(H)를 고압수 압력(P)에 대한 관계식에 의하여 상하로 이동시킴으로써 열연판(1) 표면에 작용하는 고압수 충돌압은 동일하게 유지시키면서 고압수 압력 저하에 기인한 유량을 감소시키므로써 열연판(1) 에지부의 온도 급락을 저감시킬 수 있다.That is, as shown in Figure 1, the surface scale removal device of the hot-rolled steel sheet 1 according to the present invention is a high-pressure water nozzle (2) in a cylindrical high-pressure water header (3) subdivided into a length that can be attached to two nozzles ) Is arranged. Each subdivided high-pressure water header 3 moves the vertical distance H between the surface of the hot-rolled sheet 1 from the high-pressure water jet nozzle 2 up and down by a relation to the high-pressure water pressure P. 1) It is possible to reduce the temperature drop of the edge of the hot rolled sheet 1 by reducing the flow rate due to the high pressure water pressure drop while maintaining the same high pressure water impact pressure acting on the surface.
이때, 고압수의 충돌압은 고압수압력(P)의 1.061승의 값에 18.638의 값을 곱하고 분사거리(H)의 1.581 승의 값으로 나눈 값으로 표현할 수 있는데 분사거리(H)를 변화시키게 되면 동일한 충돌압을 유지하기 위해서는 분사압력도 감소시킬 수 있는 것이다. 그러므로, 고압수압력(P)은 분사거리(H)의 1.490승의 값에 36.7(Kgf/cm2)의 압력을 더한 값으로 표현될 수 있다. 이때 고압수 압력은 펌프와 연결된 플렉시블호스(6)로 연결되는 고압수 헤더 입측에 부착된 솔레노이드식 압력조절밸브(4) 및 이와 연결된 원격제어장치(5)에 의하여 제어된다.At this time, the collision pressure of the high pressure water can be expressed by multiplying the value of 1.061 power of the high pressure water pressure (P) by the value of 18.638 and dividing by the 1.581 power of the injection distance (H) to change the injection distance (H). In order to maintain the same collision pressure, the injection pressure can be reduced. Therefore, the high pressure water pressure P may be expressed as a value of 1.6.7 power of the injection distance H plus 36.7 (Kgf / cm 2 ) of pressure. At this time, the high pressure water pressure is controlled by a solenoid pressure regulating valve (4) attached to the high pressure water header inlet connected to the flexible hose (6) connected to the pump and the remote control device (5) connected thereto.
고압수의 압력이 감소하게 되면 고압수 유량도 다음식에 의하여 감소하게 될 것이다. 즉, 고압수량(Q) = Q100× (P/100)1/2이다. 여기서 Q100은 100(Kgf/cm2) 압력에서의 고압수량이다. 열연판의 표면온도는 유량밀도의 0.6승에 비례하므로 에지부를 낮은 고압수량으로 제어함으로써 에지부의 표면온도 급락의 저감효과를 크게 할 수 있다.When the pressure of the high pressure water is reduced, the high pressure water flow rate will also be reduced by the following equation. That is, high pressure water Q = Q 100 × (P / 100) 1/2 . Q 100 is high pressure water at 100 (Kgf / cm 2 ) pressure. Since the surface temperature of the hot rolled sheet is proportional to 0.6 power of the flow density, it is possible to increase the effect of reducing the surface temperature drop of the edge portion by controlling the edge portion with a low high pressure water quantity.
상기 P= H1.480+ 36.7와 같은 식의 공차를 ±10%로 하는 이유는 -10%미만에서는 충돌압이 너무 낮아져 일부의 스케일이 제거되지 않는 등의 스케일 제거효과가 저감되기 때문이고, +10%를 초과하면 주위의 세분된 헤드의 충돌압보다 너무 높아져서 유량이 증가하고 이로 인해 폭방향 온도편차를 증가시키는 문제가 있기 때문이다.The tolerance of the equation such as P = H 1.480 + 36.7 is set to ± 10% because the impact pressure is too low at less than -10% to reduce the scale removal effect such that some scales are not removed. If the percentage is exceeded, it becomes too high than the impact pressure of the subdivided heads around, so that the flow rate increases, thereby increasing the width deviation.
이하, 실시예를 통하여 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
실시예Example
종래법에 의한 탈스케일법과 본 발명에서 안출된 탈스케일 방법의 효과를 비교하기 위하여 종래법의 경우는 고압수분사노즐과 열연판 표면간의 수직거리(H)를 258(mm)로 하고 고압수헤더(3)압력을 180(kgf/cm2)로 설정후, 분사각(S)이 28°인 11264형 노즐(2)을 사용하였다. 본 발명에서도 종래법과 동일한 초기 분사거리(H)와 동일 노즐을 이용하여 동일한 충돌압을 유지하면서 에지부의 유량을 감소시킬 목적으로 에지부 분사거리(H)를 180(cm)로 설정하였을 때 솔레노이드식 압력조절밸브에서는 111(kgf/cm2)의 압력으로 제어되었으며 이때 에지부의 고압수량은 약 22.4% 정도가 감소되었다.In order to compare the effect of the descaling method according to the conventional method and the descaling method devised in the present invention, in the case of the conventional method, the vertical distance (H) between the high pressure water jet nozzle and the surface of the hot rolled sheet is 258 (mm) and the high pressure water header (3) After setting the pressure to 180 (kgf / cm 2 ), an 11264 type nozzle 2 having an injection angle S of 28 ° was used. Also in the present invention, when the edge injection distance (H) is set to 180 (cm) for the purpose of reducing the flow rate of the edge portion while maintaining the same collision pressure by using the same initial injection distance (H) and the same nozzle as the conventional method, the solenoid type In the pressure regulating valve, the pressure was controlled at 111 (kgf / cm 2 ), and the high pressure water of the edge part was reduced by about 22.4%.
도 2는 사상압연 마무리온도가 899℃, 권취온도가 635℃, 3.5(mm)두께, 폭 1249(mm)로 제조된 저탄소강(0.031%C-0.23%Mn)에 대하여 종래법과 본 발명에 의한탈스케일 방법을 생산된 열연판의 에지부 미세조직이다. 표면층에 조대한 결정립과 혼립이 발생되어 있음을 알 수 있었다. 그러나, 종래법의 경우는 두께방향으로 약 46% 정도가 이상 조대립으로 형성되었으나 본 발명의 방법에 의한 경우는 약 20% 정도만이 이상 조대립으로 형성되어 있음을 알 수 있었다. 즉, 에지부가 Ar3변태점 이하로 온도가 급락한 상태로 열간압연되었음을 의미하는 것으로 본 발명의 경우가 온도 저감효과가 우수함을 알 수 있었다.Figure 2 is a low-carbon steel (0.031% C-0.23% Mn) made of finishing finishing temperature 899 ℃, winding temperature 635 ℃, 3.5 (mm) thickness, width 1249 (mm) according to the conventional method and the present invention Descale method is the edge microstructure of the hot rolled sheet produced. It was found that coarse grains and coexistence occurred in the surface layer. However, in the conventional method, about 46% was formed as abnormal coarse grains in the thickness direction, but in the case of the method of the present invention, only about 20% was found to be formed as abnormal coarse grains. That is, it means that the edge portion is hot-rolled in a state in which the temperature dropped sharply below the Ar 3 transformation point, it can be seen that the temperature reduction effect is excellent in the case of the present invention.
도 3은 종래법과 본 발명에 의해서 제조된 열연 코일의 에지부 외관을 나타낸 것으로 종래법의 경우는 빠른 냉각속도로 인하여 박리가 용이한 뷔스타이트가 다량 에지부에 형성됨으로써 정정작업 등의 재권취과정에서 스케일이 쉽게 탈락되고 러스트가 발생되는 경우이나 본 발명의 경우는 에지부에 러스트가 발생되지 않았음을 알 수 있는데, 이는 적은 냉각수량에 의하여 냉각속도가 느려졌기 때문에 박리가 용이한 뷔스타이트의 형성량이 적었기 때문이다.Figure 3 shows the outer appearance of the edge portion of the hot rolled coil manufactured by the conventional method and the present invention, in the case of the conventional method re-winding process, such as correction work by forming a large number of edge parts easy to peel off due to the fast cooling rate In the case of the present invention, the scale is easily dropped and rust is generated. However, in the present invention, no rust is generated at the edge portion. This is because of the low cooling water, the cooling rate is slowed down. This is because the formation amount was small.
결론적으로, 본 발명에 의한 탈스케일 방법을 열간압연공정에 적용시켜 사용함으로써 종래법에 의한 경우보다 열연판 폭방향 충돌압분포가 균일하고 열연판 표면온도편차를 저감시킴으로써 재질편차 및 에지부에 발생되는 박리 용이형 스케일로 인한 러스트 발생 등의 표면결함을 해소시킬 수 있었다.In conclusion, by using the descaling method according to the present invention in the hot rolling process, the hot plate width direction impact pressure distribution is more uniform than that of the conventional method, and the surface temperature deviation of the hot rolled plate is reduced, resulting in material deviation and edge portion. The surface defects, such as the generation | occurrence | production of the rust due to the easy peeling scale which became, were able to be eliminated.
상술한 바와 같은 본 발명에 의하면, 열연공정의 압연설비가 최신화 및 연속화 됨에 따라 기존 탈스케일 설비에서 폭방향 에지부의 냉각수량을 감소시키면서 동일한 충돌압을 유지할 수 있도록 헤더에서의 냉각수량을 피드백 제어할 수 있는 탈스케일 시스템이 제공되며, 이로 인해 열연판 폭방향 충돌압분포가 균일하고 열연판 표면온도편차를 저감시키며 재질편차 및 에지부에 발생되는 박리 용이형 스케일로 인한 러스트 발생 등의 표면결함을 해소시킬 수 있는 효과가 있다.According to the present invention as described above, as the rolling equipment of the hot rolling process is updated and continuous, feedback control of the amount of cooling water in the header to maintain the same collision pressure while reducing the amount of cooling water in the widthwise edge portion in the existing descale equipment A descaling system is provided, which enables uniform hot rolled plate width impact pressure distribution, reduces hot plate surface temperature deviation, and surface defects such as rust caused by material deviation and easy peeling scale generated at edges. There is an effect that can be eliminated.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20040012083A (en) * | 2002-07-31 | 2004-02-11 | 주식회사 포스코 | Removing Method for Scle of Hot Strip using Condition of Scale |
| KR101220700B1 (en) * | 2010-12-28 | 2013-01-09 | 주식회사 포스코 | Method for Reducing Edge Crack of Thick Rolled Medium Carbon Steel Plate of at Hot Rolling |
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| KR100562641B1 (en) * | 2001-11-29 | 2006-03-20 | 주식회사 포스코 | Hot rolling method for removing residual stress of stainless hot rolled sheet |
| CN104741398A (en) * | 2015-04-01 | 2015-07-01 | 山东钢铁股份有限公司 | High-pressure scale removing water system and control method thereof |
| CN115870356A (en) * | 2023-01-28 | 2023-03-31 | 北京首钢股份有限公司 | A descaling method for reducing temperature difference of slab width |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20040012083A (en) * | 2002-07-31 | 2004-02-11 | 주식회사 포스코 | Removing Method for Scle of Hot Strip using Condition of Scale |
| KR101220700B1 (en) * | 2010-12-28 | 2013-01-09 | 주식회사 포스코 | Method for Reducing Edge Crack of Thick Rolled Medium Carbon Steel Plate of at Hot Rolling |
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