JP4076971B2 - Steel plate cooling method - Google Patents

Steel plate cooling method Download PDF

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JP4076971B2
JP4076971B2 JP2004100971A JP2004100971A JP4076971B2 JP 4076971 B2 JP4076971 B2 JP 4076971B2 JP 2004100971 A JP2004100971 A JP 2004100971A JP 2004100971 A JP2004100971 A JP 2004100971A JP 4076971 B2 JP4076971 B2 JP 4076971B2
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cooling
water
steel plate
steel sheet
ratio
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JP2005279764A (en
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禎夫 森本
雅人 藤本
洋一郎 小林
正樹 須藤
克壮 小林
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Kobe Steel Ltd
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Description

本発明は、鋼板の冷却方法に関し、より詳しくは、厚鋼板のオンライン冷却で鋼板形状の良好な鋼板を得る技術に関するものである。   The present invention relates to a method for cooling a steel plate, and more particularly to a technique for obtaining a steel plate having a good shape by online cooling of a thick steel plate.

熱間圧延直後の鋼板をオンラインにて通板方向前端から後端に向けて順次冷却する厚鋼板の加速冷却方法(特定温度領域をある冷却速度で冷却した後空冷する方法)として、例えば、下記「特許文献1」記載のものが公知である。
この従来のものは、鋼板を、上下面スリットジエット冷却とした前段冷却部と前記スリットジエット冷却以外の上下面冷却とした後段冷却部とを通過させて、通板方向前端から後端に向けて順次冷却するものであり、鋼板を通板させるに際し、前段冷却部における上下水量比(上下面のスリットジェットノズルから噴出されるジェット水の水量比)を所定の一定値に設定し、当該一定値の下で一方向通板を行うものであった。
As an accelerated cooling method for thick steel plates that sequentially cools a steel plate immediately after hot rolling from the front end to the rear end in the sheet passing direction (a method of air cooling after cooling a specific temperature region at a certain cooling rate), for example, The thing of "patent document 1" is well-known.
In this conventional one, the steel sheet is passed through the front cooling section that is the upper and lower surface slit jet cooling and the rear cooling section that is the upper and lower surface cooling other than the slit jet cooling, from the front end in the sheet passing direction toward the rear end. In order to cool sequentially, when passing the steel plate, the ratio of the amount of water in the upper and lower water (the ratio of the amount of jet water ejected from the slit jet nozzles on the upper and lower surfaces) in the pre-cooling section is set to a predetermined constant value. One-way threading was performed under

また、制御冷却において、鋼板の冷却される領域が、冷却装置の冷却ゾーンに入る直前に前記領域の上下面の温度を測定し、この測定結果の上下面温度差に基づき、当該冷却ゾーンの上下水量比を変更して、反りや曲がりなどの形状不良を防止する技術も提案されている(特許文献2参照)。
特開昭62−289316号公報 特開2003−293030号公報
Further, in the controlled cooling, the temperature of the upper and lower surfaces of the region immediately before the region where the steel sheet is cooled enters the cooling zone of the cooling device, and the upper and lower surfaces of the cooling zone are measured based on the temperature difference between the upper and lower surfaces of the measurement result. There has also been proposed a technique for changing the water amount ratio to prevent shape defects such as warping and bending (see Patent Document 2).
JP-A-62-289316 JP 2003-293030 A

前記「特許文献1」記載の設備において、前段冷却部の上下水量比を一定にして冷却する方法では、冷却後の鋼板の通板方向全長にわたって、均一な形状(平坦度)を得ることが困難であるという問題があった。
一方、前記「特許文献2」に記載のものは、各冷却ゾーン入側で鋼板の上下面温度を測定し、該上下面温度の差に基づいて当該冷却ゾーンの上下水量比を修正するものであるから、フィードフォアード制御となり、その制御は高速処理が必要となる等複雑なものになるという問題があった。
In the facility described in “Patent Document 1”, it is difficult to obtain a uniform shape (flatness) over the entire length in the sheet passing direction of the steel sheet after cooling by the method of cooling with the upper and lower water amount ratio of the front cooling unit being constant. There was a problem of being.
On the other hand, the thing of the said "patent document 2" measures the upper and lower surface temperature of a steel plate in each cooling zone entrance side, and corrects the upper and lower water volume ratio of the said cooling zone based on the difference of this upper and lower surface temperature. Therefore, there is a problem that the feedforward control is performed, and the control becomes complicated such that high-speed processing is required.

そこで本発明は、複雑な制御を行うことなく、簡便な制御により、鋼板の全長にわたって均一な形状が得られる鋼板の冷却方法を提供することを目的とする。   Then, an object of this invention is to provide the cooling method of the steel plate which can obtain a uniform shape over the full length of a steel plate by simple control, without performing complicated control.

前記目的を達成するため、本発明は次の手段を講じた。即ち、本発明の特徴とするところは、熱間圧延された鋼板を、上下面スリットジエット冷却とした前段冷却部と前記スリットジエット冷却以外の上下面冷却とした後段冷却部とを通過させて、鋼板の前端から後端に向けて順次冷却する鋼板の冷却方法において、前記鋼板が前記前段冷却部を通過途中において、前記上下面スリットジエット冷却の上下水量比を、予め設定した初期値から予め設定した他の値に変更する点にある。
本発明によれば、予め定めた値に基づき前段冷却部の上下水量比を制御するので、前記「特許文献2」記載のような複雑なフィードフォアード制御を行うことなく、簡便な制御となる。
In order to achieve the above object, the present invention takes the following measures. That is, the feature of the present invention is that the hot-rolled steel sheet is passed through a front cooling part that is upper and lower slit jet cooling and a rear cooling part that is upper and lower surface cooling other than the slit jet cooling, In the method of cooling a steel sheet that sequentially cools from the front end to the rear end of the steel sheet, the vertical water ratio of the upper and lower surface slit jet cooling is preset from a preset initial value while the steel sheet passes through the front cooling section. The point is to change to another value.
According to the present invention, since the water / water ratio of the upstream cooling unit is controlled based on a predetermined value, simple control can be performed without performing complicated feedforward control as described in "Patent Document 2".

また、本発明においては、前記上下面スリットジエット冷却の上下水量比と鋼板の前端部及び後端部の反り量との関係を、上下水量比を種々変化させて予め定量化しておき、前記定量化したデータに基づき、前端部が平坦となる上下水量比を前記初期値とし、後端部が平坦となる上下水量比を前記他の値とするものである。
このような値を採用することにより、鋼板の全長にわたって均一な形状を得ることができる。
Further, in the present invention, the relationship between the vertical water amount ratio of the upper and lower surface slit jet cooling and the warpage amount of the front end portion and the rear end portion of the steel sheet is quantified in advance by changing the vertical water amount ratio in various ways. Based on the converted data, the water / water ratio that makes the front end flat is the initial value, and the water / water ratio that makes the rear end flat is the other value.
By adopting such values, a uniform shape can be obtained over the entire length of the steel sheet.

本発明によれば、予め設定した値になるよう上下水量比を制御するので、複雑な制御をすることなく簡便な方法により、鋼板の全長にわたって平坦な鋼板を製造することが可能になる。   According to the present invention, since the water / water ratio is controlled so as to have a preset value, a flat steel plate can be manufactured over the entire length of the steel plate by a simple method without complicated control.

以下、本発明の実施の形態を図面に基づき説明する。
図1に示すものは、本発明方法の実施に供される圧延冷却設備である。
この冷却設備は、熱間圧延設備(図示省略)の下流側に接続されており、前段冷却部1と後段冷却部2とを有する。熱間圧延された鋼板3は、同一水平面内に所定ピッチで列設された搬送ロール4によって形成されるパスライン5上を矢印a方向に搬送されて、前段冷却部1から後段冷却部2を通過することにより、所定の組織となるように制御冷却または加速冷却される。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
What is shown in FIG. 1 is a rolling cooling facility used for carrying out the method of the present invention.
This cooling facility is connected to the downstream side of a hot rolling facility (not shown), and has a front cooling unit 1 and a rear cooling unit 2. The hot-rolled steel sheet 3 is transported in the direction of arrow a on a pass line 5 formed by transport rolls 4 arranged at a predetermined pitch in the same horizontal plane. By passing, controlled cooling or accelerated cooling is performed so that a predetermined tissue is obtained.

前記前段冷却部1は、前記パスライン5を挟んだその上下にスリットジェットノズル6,6を有する。パスライン5の上側には、前記スリットジェットノズル6の前後(なお、設備における前後とは、通板方向(矢印a方向)上流側を「前」といい、下流側を「後」というが、鋼板3の前後は、通板方向下流側を「前」、上流側を「後」という。)に、水切りロール7,7が鋼板3の上面に対して接離自在に設けられている。
前記前後の水切りロール7に対向してその下方には、前記搬送ロール4が配置されている。この搬送ロール4は、前記水切りロール7としても機能するものであるので、水切りロール7の下方の搬送ロール4は、水切りロールと称する。
The pre-cooling unit 1 has slit jet nozzles 6 and 6 above and below the pass line 5. On the upper side of the pass line 5, the front and rear of the slit jet nozzle 6 (note that the front and rear in the equipment are referred to as “front” on the upstream side in the plate passing direction (arrow a direction), and “rear” on the downstream side, Before and after the steel plate 3, the draining rolls 7 and 7 are provided so as to be able to contact with and separate from the upper surface of the steel plate 3, with the downstream side in the sheet passing direction as “front” and the upstream side as “rear”.
The transport roll 4 is disposed below and facing the front and rear draining rolls 7. Since the transport roll 4 also functions as the draining roll 7, the transport roll 4 below the draining roll 7 is referred to as a draining roll.

前記後段冷却部2は、前記スリットジエット冷却以外の上下面冷却とされている。この実施の形態では、パスライン5の上側には、パイプラミナノズル8を有し、下側にはスプレノズル9を有するものとされている。
前記前段冷却装置1および後段冷却装置2の上下の各ノズル6,8,9の水量及び上下水量比は、制御自在とされている。
図2に、前記前段冷却部1の詳細が示されている。
上下のスリットジェットノズル6の噴出口は、該ノズル6から噴出される冷却水が鋼板3の搬送方向(矢印a方向)に沿って流れるように、水平に対して所定の角度(θ)をもって傾斜して配置されている。
The rear stage cooling unit 2 is an upper and lower surface cooling other than the slit jet cooling. In this embodiment, a pipe lamina nozzle 8 is provided on the upper side of the pass line 5, and a spray nozzle 9 is provided on the lower side.
The amount of water and the ratio of the amount of water in the upper and lower nozzles 6, 8, and 9 of the upstream cooling device 1 and the downstream cooling device 2 can be controlled.
FIG. 2 shows details of the pre-cooling unit 1.
The outlets of the upper and lower slit jet nozzles 6 are inclined at a predetermined angle (θ) with respect to the horizontal so that the cooling water ejected from the nozzles 6 flows along the conveying direction (arrow a direction) of the steel plate 3. Are arranged.

パスライン5の下側において、スリットジェットノズル6とその下流側の搬送ロール(水切りロール)4との間に、整流板10が配置されている。また、パスライン5の上側において、スリットジェットノズル6とその下流側の水切りロール7との間に、整流板10が配置されている。
前記上下整流板10の前端とスリットジェットノズル6とは密着しており、整流板10の後端と水切りロール7又は搬送ロール(水切りロール)4との間には、冷却水が排出可能な隙間が形成されている。
On the lower side of the pass line 5, a rectifying plate 10 is disposed between the slit jet nozzle 6 and a transport roll (draining roll) 4 on the downstream side thereof. Further, on the upper side of the pass line 5, a rectifying plate 10 is disposed between the slit jet nozzle 6 and the draining roll 7 on the downstream side thereof.
The front end of the upper and lower rectifying plate 10 and the slit jet nozzle 6 are in close contact with each other, and a gap through which cooling water can be discharged is provided between the rear end of the rectifying plate 10 and the draining roll 7 or the transporting roll (draining roll) 4. Is formed.

前記上整流板10と鋼板3の上面との間、および下整流板10と鋼板3の下面との間には、上下方向所定間隔の隙間が形成されている。
前記スリットジェットノズル6から噴出された冷却水は、鋼板3に衝突して鋼板3の熱を奪う衝突域Aを形成し、衝突後、冷却水は、鋼板3と整流板10の間隙に沿って流れながら鋼板3の熱を奪う沿い流れ域Bを形成し、その後、冷却水の流れは、水切りロール7又は搬送ロール(水切りロール)4によって遮断され、乱流状態となり、鋼板3の熱を奪う攪拌域Cを形成している。前記整流板10は、沿い流れ域Bと攪拌域Cとを分離する機能を有する。
Between the upper rectifying plate 10 and the upper surface of the steel plate 3 and between the lower rectifying plate 10 and the lower surface of the steel plate 3, gaps are formed at predetermined intervals in the vertical direction.
The cooling water ejected from the slit jet nozzle 6 collides with the steel plate 3 to form a collision zone A where the heat of the steel plate 3 is taken away. After the collision, the cooling water flows along the gap between the steel plate 3 and the current plate 10. A flow region B is formed along which the heat of the steel plate 3 is taken while flowing, and then the flow of the cooling water is interrupted by the draining roll 7 or the conveying roll (draining roll) 4 to be in a turbulent state and take the heat of the steel plate 3. A stirring zone C is formed. The current plate 10 has a function of separating the flow area B and the stirring area C from each other.

前記設備を用いた本発明の鋼板3の冷却方法は、前記鋼板3が前記前段冷却部1を通過途中において、上下面スリットジエット冷却(スリットジェットノズル6からの冷却水による冷却をいう)の上下水量比を、予め設定した初期値から予め設定した他の値に変更するものである。
本願発明者らは、本願発明に到達するまで、種々の実験を行った。
まず、前段冷却装置1の上下面のスリットジェットノズル6の水量比(上下水量比)を所定の一定値に設定して、一方向通板冷却の実験を行った。
The cooling method of the steel plate 3 of the present invention using the above-mentioned equipment is the upper and lower sides of the upper and lower slit jet cooling (referred to as cooling by the cooling water from the slit jet nozzle 6) while the steel plate 3 passes through the preceding cooling unit 1. The water amount ratio is changed from a preset initial value to another preset value.
The inventors of the present application conducted various experiments until reaching the present invention.
First, the water amount ratio (up / down water amount ratio) of the slit jet nozzles 6 on the upper and lower surfaces of the pre-stage cooling apparatus 1 was set to a predetermined constant value, and a one-way plate cooling experiment was performed.

表1は、図1に示した冷却設備の前段冷却装置1の上下水量比を種々変化させて、一方向通板冷却を行った後の鋼板3の形状を示している。
前記実験条件は次の通りである。
板サイズ:厚み50mm×幅3000mm×長さ15000mm、
前端部及び後ろ端部の長さ:1000〜2000mm
通板速度:0.22m/sec、
冷却開始温度:800℃、
Table 1 shows the shape of the steel plate 3 after the one-way plate cooling is performed by variously changing the ratio of the amount of water in the upper and lower water of the pre-stage cooling device 1 of the cooling facility shown in FIG.
The experimental conditions are as follows.
Plate size: Thickness 50mm x width 3000mm x length 15000mm,
Length of front end and rear end: 1000-2000mm
Plate speed: 0.22 m / sec,
Cooling start temperature: 800 ° C.

Figure 0004076971
Figure 0004076971

前記表1によれば、一方向通板冷却における鋼板3の前端部と後続して冷却される部分(中央部/後端部)の反りは、上下水量比が大きくなるにつれて下反りから上反りに変化するものの、前端部と中央部/後端部を共に平坦にできる上下水量比は存在しないことが分かった。すなわち、上下水量比を一定にした場合、冷却後の鋼板全長を平坦にすることは不可能であった。
その理由を考察するに、前段冷却装置1におけるジェット水流による鋼板3の冷却は、衝突域A、沿い流れ域B、および攪拌域Cによる3段階冷却から構成されていると考えられるが、鋼板3の前端部の冷却に着目すると、攪拌域Cにおいては、鋼板の前端部が水切りロールに達したとき、初めて攪拌現象が生じ始め、攪拌が定常状態になるときには、すでに鋼板3の前端は水切りロールを通過しているため、この領域Cはほとんど鋼板3の前端部の冷却に寄与していないと考えられる。
According to Table 1, the warpage of the front end portion of the steel plate 3 and the subsequently cooled portion (center portion / rear end portion) in the one-way plate cooling is from the lower warp to the upper warp as the water-to-water ratio is increased. However, it was found that there is no water / water ratio that can flatten the front end and the center / rear end. That is, when the water / water ratio is made constant, it is impossible to flatten the entire length of the steel plate after cooling.
To consider the reason, the cooling of the steel plate 3 by the jet water flow in the pre-stage cooling apparatus 1 is considered to be composed of three-stage cooling by the collision zone A, the along flow zone B, and the stirring zone C. In the stirring zone C, when the front end of the steel sheet reaches the draining roll, the stirring phenomenon begins to occur for the first time, and when the stirring is in a steady state, the front end of the steel sheet 3 is already at the draining roll. Therefore, it is considered that this region C hardly contributes to the cooling of the front end portion of the steel plate 3.

すなわち、鋼板3の前端部と中央部/後端部では冷却のされ方が異なっており、各々の冷却のされ方に応じた上下面のジェット水の水量比を設定することが必要であると考えられた。
そこで、本願発明者らは、前記表1に示した実験におけるデータを定量化するためにグラフ化した。そのグラフを図3に示す。
図3によれば、鋼板3の前端部が平坦になる上下水量比は、0.8であり、中央部/後端部が平坦になる上下水量比は、1.3であることが分かる。
That is, the cooling method is different between the front end portion and the central portion / rear end portion of the steel plate 3, and it is necessary to set the water amount ratio of the upper and lower jet water according to each cooling method. it was thought.
Therefore, the inventors of the present application made a graph to quantify the data in the experiment shown in Table 1. The graph is shown in FIG.
According to FIG. 3, it is understood that the water / water ratio in which the front end of the steel plate 3 is flat is 0.8, and the water / water ratio in which the center / rear end is flat is 1.3.

次に、上下水量比を変更するタイミングは、何れが最適かの実験を行った。その結果を次の表2に示す。   Next, an experiment was conducted as to which timing is optimal for changing the water / water ratio. The results are shown in Table 2 below.

Figure 0004076971
Figure 0004076971

前記表2によれば、上下水量比を変更するタイミングは、鋼板先端が下流側水切りロール7より1000mm〜2000mm進んだ時が最適であることがわかる。
以上の実験より、次のことが一般化できる。
すなわち、前記鋼板3が前記前段冷却部1を通過途中において、上下面スリットジエット冷却の上下水量比を、予め設定した初期値から予め設定した他の値に変更するに際し、前記前段冷却装置1における上下面スリットジエット冷却の上下水量比と鋼板3の前端部及び後端部の反り量との関係を、上下水量比を種々変化させて予め定量化しておき、前記定量化したデータに基づき、前端部が平坦となる上下水量比を前記初期値とし、後端部が平坦となる上下水量比を前記他の値とすることにより、全長にわたって平坦な鋼板3を得ることができる。
According to Table 2, it can be seen that the optimum timing for changing the water amount ratio is when the steel sheet tip advances 1000 mm to 2000 mm from the downstream draining roll 7.
From the above experiments, the following can be generalized.
That is, when the steel plate 3 is passing through the pre-cooling section 1, when changing the water ratio of the upper and lower surface slit jet cooling from the preset initial value to another preset value, The relationship between the vertical water amount ratio of the upper and lower surface slit jet cooling and the warpage amount of the front end portion and the rear end portion of the steel plate 3 is quantified in advance by changing the vertical water amount ratio in various ways, and based on the quantified data, the front end The steel plate 3 that is flat over the entire length can be obtained by setting the water / water ratio in which the part is flat as the initial value and the water / water ratio in which the rear end part is flat as the other value.

そして、上下水量比を切り替える時期は、前記鋼板3の前端が下流側水切りロール7から1500mm進んだときが最も良い。   The best time to switch the water / water ratio is when the front end of the steel plate 3 advances 1500 mm from the downstream draining roll 7.

本発明の効果を確認するために、下記条件の下で、従来方法との比較実験を行った。
加速冷却設備:前段上下面スリットジェット冷却、後段上面パイプラミナ/下面スプレ冷却。
鋼板サイズ:50mm厚み×3000mm幅×18000mm長さ。
冷却開始温度:900℃。
冷却停止温度:200℃以下。
スリットジェット冷却の上下水量比:通板途中で変更(本発明方法)、通板中固定(従来法)。
上面パイプラミナ/下面スプレ冷却の上下水量比:通板中固定。
In order to confirm the effect of the present invention, a comparison experiment with a conventional method was performed under the following conditions.
Accelerated cooling equipment: Front stage upper / lower slit jet cooling, rear upper surface pipe lamina / lower surface spray cooling.
Steel plate size: 50 mm thickness x 3000 mm width x 18000 mm length.
Cooling start temperature: 900 ° C.
Cooling stop temperature: 200 ° C. or less.
Slit jet cooling water flow ratio: Change during feeding (method of the present invention), fixing during feeding (conventional method).
Top / bottom water ratio of upper surface pipe lamina / lower surface spray cooling: fixed in through plate.

結果を表3に示す。   The results are shown in Table 3.

Figure 0004076971
Figure 0004076971

前記表3によれば、本発明により全長にわたり平坦な鋼板が得られることが分かる。
なお、本発明は、前記実施の形態に示すものに限定されるものではない。
According to Table 3, it can be seen that a flat steel plate can be obtained over the entire length according to the present invention.
In addition, this invention is not limited to what is shown to the said embodiment.

本発明は、熱間厚板圧延のオンライン冷却に利用できる。   The present invention can be used for on-line cooling of hot plate rolling.

図1は、本発明方法に使用する冷却設備の構成図である。FIG. 1 is a configuration diagram of a cooling facility used in the method of the present invention. 図2は、図1に示す前段冷却部の詳細図である。FIG. 2 is a detailed view of the pre-cooling unit shown in FIG. 図3は、スリットジェット冷却の上下水量比と鋼板の反り量との関係を示すグラフである。FIG. 3 is a graph showing the relationship between the ratio of the amount of water between the upper and lower water in the slit jet cooling and the amount of warpage of the steel sheet.

符号の説明Explanation of symbols

1 前段冷却部
2 後段冷却部
3 鋼板
6 スリットジェットノズル
7 水切りロール
10 整流板
DESCRIPTION OF SYMBOLS 1 1st stage cooling part 2 2nd stage cooling part 3 Steel plate 6 Slit jet nozzle 7 Draining roll 10 Current plate

Claims (2)

熱間圧延された鋼板を、上下面スリットジエット冷却とした前段冷却部と前記スリットジエット冷却以外の上下面冷却とした後段冷却部とを通過させて、鋼板の前端から後端に向けて順次冷却する鋼板の冷却方法において、
前記鋼板が前記前段冷却部を通過途中において、前記上下面スリットジエット冷却の上下水量比を、予め設定した初期値から予め設定した他の値に変更することを特徴とする鋼板の冷却方法。
The hot-rolled steel sheet is sequentially cooled from the front end to the rear end of the steel sheet by passing through the front cooling section with upper and lower slit jet cooling and the rear cooling section with upper and lower surface cooling other than the slit jet cooling. In the cooling method of the steel sheet
A method for cooling a steel sheet, wherein the steel sheet is changed from a preset initial value to another preset value while the steel sheet passes through the pre-stage cooling section.
前記上下面スリットジエット冷却の上下水量比と鋼板の前端部及び後端部の反り量との関係を、上下水量比を種々変化させて予め定量化しておき、
前記定量化したデータに基づき、前端部が平坦となる上下水量比を前記初期値とし、後端部が平坦となる上下水量比を前記他の値とすることを特徴とする請求項1記載の鋼板の冷却方法。
The relationship between the water ratio of the upper and lower surface slit jet cooling and the amount of warpage of the front end and the rear end of the steel sheet is preliminarily quantified by changing the water ratio in various ways.
2. The water / water ratio that makes the front end flat based on the quantified data is the initial value, and the water / water ratio that makes the rear end flat is the other value. A method for cooling steel sheets.
JP2004100971A 2004-03-30 2004-03-30 Steel plate cooling method Expired - Lifetime JP4076971B2 (en)

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