JP2012045606A - Manufacturing method of thick steel plate and manufacturing apparatus line - Google Patents

Manufacturing method of thick steel plate and manufacturing apparatus line Download PDF

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JP2012045606A
JP2012045606A JP2010191963A JP2010191963A JP2012045606A JP 2012045606 A JP2012045606 A JP 2012045606A JP 2010191963 A JP2010191963 A JP 2010191963A JP 2010191963 A JP2010191963 A JP 2010191963A JP 2012045606 A JP2012045606 A JP 2012045606A
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steel plate
descaling
thick steel
leveler
roll
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JP5614177B2 (en
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Katsumi Okada
克己 岡田
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a thick steel plate which is quenched or accelerated-cooled after hot rolling, and has few surface flaw due to scale pinching, and is superior in scale peeling properties and further has superior surface properties, and to provide a manufacturing apparatus line.SOLUTION: After hot-rolling the thick steel plate, and before forced cooling, the thick steel plate is shape-straightened with a pre-leveler, and then the shape of the steel plate after shape straightening is detected with a drain roll in front of a descaling device, and the descaling device is controlled to perform descaling, and then the plate is forced-cooled. In the manufacturing apparatus line of the thick steel plate, a forced cooling device provided with the pre-leveler is arranged on the downstream side of a finish rolling machine. The descaling device provided with the drain rolls on the back and in front of it, desirably movable up and down, is arranged on the downstream side of the pre-leveler and further on the upstream side of the forced cooling device. A detector for detecting the moving amount of a roll shaft in vertical direction is attached to the drain roll in front of the descaling device.

Description

本発明は、表面性状に優れる厚鋼板の製造方法および製造装置列に関し、熱間圧延後、焼入れまたは加速冷却されるものに関する。   The present invention relates to a method and apparatus for producing a thick steel plate having excellent surface properties, and relates to one that is quenched or acceleratedly cooled after hot rolling.

近年、鋼構造物の大型化や、使用環境の過酷化が進展し、鋼材の諸特性に対する要求性能は高度化し、厚鋼板の場合、表層の硬度や伸び性能に対する要求が厳しく、板内均一性にも優れる厳格仕様材の生産量が増加している。   In recent years, the steel structure has become larger and the use environment has become more severe, and the required performance for various properties of steel has become more advanced. The production volume of strict specification materials that are also excellent is increasing.

このような厳格仕様材は、直接焼入れや加速冷却を行う冷却装置を用いるＴＭＣＰを駆使して製造されるが、直接焼入れや加速冷却の冷却性能は鋼板表面のスケールの付着状況の影響を受けることから、製造ラインにおけるデスケーリング装置の配置位置や、デスケーリングを効果的に行うデスケーリング技術に関して種々提案されている。   Such strict specification materials are manufactured using TMCP that uses a cooling device that performs direct quenching and accelerated cooling, but the cooling performance of direct quenching and accelerated cooling is affected by the state of scale adhesion on the steel sheet surface. Therefore, various proposals have been made regarding the arrangement position of the descaling device in the production line and the descaling technology for effectively performing the descaling.

特許文献１は、厚鋼板のスケール除去方法に関し、熱間矯正時のスケール押し込みや成品での表面性状不良を防止するため、仕上げ圧延、熱間矯正、強制冷却の順に実施する工程間で適宜デスケーリングを行うことが記載されている。   Patent Document 1 relates to a method for removing the scale of a thick steel plate, and in order to prevent scale indentation during hot straightening and surface quality defects in the product, it is necessary to properly perform de-rolling between the steps performed in the order of finish rolling, hot straightening, and forced cooling. Scaling is described.

特許文献２は、表面性状の優れた鋼板の製造方法に関し、高圧デスケーリング設備において鋼板の板厚が変動しても、高圧水ジェットの圧力と噴射範囲が最もデスケーリング効果が得られる距離となるようにデスケーリングノズルと鋼板表面との間隔を一定に制御することが記載されている。   Patent Document 2 relates to a method of manufacturing a steel sheet having excellent surface properties, and even if the plate thickness of the steel sheet fluctuates in a high-pressure descaling facility, the pressure of the high-pressure water jet and the injection range are the distances that can obtain the most descaling effect. Thus, it is described that the distance between the descaling nozzle and the steel plate surface is controlled to be constant.

特許文献３は、高圧水デスケーリングのヘッダーに関し、難剥離性スケールを剥離させるため、ヘッダーを上下昇降自在として鋼板とヘッダーとの距離を近づけて噴射水の単位散布面積当りの衝突力を上昇させることが記載されている。   Patent Document 3 relates to a header for high-pressure water descaling, and in order to peel off a difficult-to-peel scale, the header can be moved up and down, the distance between the steel plate and the header is reduced, and the collision force per unit spray area of the spray water is increased. It is described.

特許文献４は、熱間圧延設備及び熱間圧延方法に関し、連続熱間圧延機の入側に配置されるV型デスケーラにおいて対向する水噴射ノズルをそれぞれ上下方向に回転可動として、鋼板の板厚が変わっても鋼板表面上における噴流水の間隔を最適として高いデスケーリング能力を維持することが記載されている。   Patent Document 4 relates to a hot rolling facility and a hot rolling method, in which the water jet nozzles facing each other in a V-type descaler arranged on the entry side of a continuous hot rolling mill are respectively movable in the vertical direction, and the thickness of the steel sheet It is described that a high descaling ability is maintained by optimizing the interval of the jet water on the steel plate surface even if changes.

特開平９−５７３２７号公報JP-A-9-57327 特開平５−２２８５２６号公報JP-A-5-228526 特開昭６３−６８２１３号公報JP-A 63-68213 特開２００２−３３６９０８号公報JP 2002-336908 A

ところで、仕上げ圧延、熱間矯正、強制冷却の順に実施する工程で厚鋼板を製造する場合、厳格仕様材に対して熱間矯正後、強制冷却の前にデスケーリングを行うと、しばしば鋼板に表面疵が発生することが観察される。   By the way, when manufacturing thick steel plates in the order of finish rolling, hot straightening, and forced cooling, if the descaling is performed after hot straightening and before forced cooling for strict specification materials, the surface of the steel plate is often It is observed that wrinkles occur.

本発明者等が製造ラインにおいて当該表面疵の発生状況を詳細に検討したところ、熱間矯正時にはスケールの剥離は観察されないことから、特許文献１記載の、熱間矯正時にスケールが剥離しないように、仕上げ圧延から熱間矯正の間でデスケーリングを行って、スケール厚さを調整することは有効であるものの、更に強制冷却の直前でデスケーリングを行うことによって、スケールが含まれたデスケーリング水が鋼板表面上を流れて熱間矯正行なう部位に達し、スケールとともに鋼板を熱間矯正することになって当該表面疵が発生する場合のあることが判明した。   When the present inventors examined the generation | occurrence | production state of the said surface flaw in a production line in detail, since peeling of a scale is not observed at the time of hot correction, it is described in patent document 1 so that a scale may not peel at the time of hot correction. Although it is effective to adjust the scale thickness by performing descaling between finish rolling and hot straightening, the descaling water containing the scale can be obtained by performing descaling immediately before forced cooling. Has flowed over the surface of the steel sheet and reached the site where hot correction is performed, and it has been found that the surface flaws may occur due to hot correction of the steel sheet together with the scale.

一方、需要家においては材質均一性への要望が高まり、強制冷却の際、冷却不均一の一因となるスケールを残存させないようデスケーリング性能を向上させることが必要になっている。   On the other hand, demand for material uniformity is increasing in consumers, and it is necessary to improve descaling performance so as not to leave a scale that contributes to non-uniform cooling during forced cooling.

そこで、本発明は、熱間矯正後、強制冷却の前にデスケーリングを行った場合でも表面疵が発生せず、スケール剥離性にも優れる、表面性状に優れた厚鋼板の製造方法および製造装置列を提供することを目的とする。   Therefore, the present invention provides a method and apparatus for producing a thick steel plate with excellent surface properties that does not generate surface flaws even when descaling is performed after hot correction and before forced cooling, and has excellent scale peelability. The purpose is to provide a column.

本発明の課題は以下の手段で達成可能である。
１．表面性状に優れた厚鋼板の製造方法であって、熱間圧延後、プリレベラーで形状矯正した後、水切りローラを前後に備えたデスケーリング装置でデスケーリングして、強制冷却する際、形状矯正後の鋼板形状を、前記デスケーリング装置の前方となる水切りローラで検出し、デスケーリング装置を制御することを特徴とする表面性状に優れた厚鋼板の製造方法。
２．仕上げ圧延機の下流側に、プリレベラーを備えた強制冷却装置を配した厚鋼板の製造装置列であって、前記プリレベラーと前記強制冷却装置の間に、その前後に水切りロールを備えたデスケーリング装置を有し、前記デスケーリング装置の前方の水切りロールはローラ軸芯の高さ方向の移動量を検出する機構を有していることを特徴とする厚鋼板の製造装置列。 The object of the present invention can be achieved by the following means.
1. It is a manufacturing method of thick steel plate with excellent surface properties, after hot rolling, after shape correction with a pre-leveler, after descaling with a descaling device equipped with water draining rollers at the front and back, forcibly cooling, after shape correction A method for producing a thick steel plate having excellent surface properties, wherein the shape of the steel plate is detected by a draining roller in front of the descaling device, and the descaling device is controlled.
2. A steel plate manufacturing apparatus array in which a forced cooling device equipped with a pre-leveler is arranged on the downstream side of the finish rolling mill, and a descaling device equipped with a draining roll before and after the pre-leveler and the forced cooling device And a draining roll in front of the descaling device has a mechanism for detecting the amount of movement of the roller core in the height direction.

本発明によれば、スケールの噛み込みが少なく表面性状に優れた厚鋼板が得られ、産業上極めて有用である。   According to the present invention, it is possible to obtain a thick steel plate with less surface biting and excellent surface properties, which is extremely useful industrially.

本発明の適用に好適なデスケーリング装置の構成を説明する模式図。The schematic diagram explaining the structure of the descaling apparatus suitable for application of this invention. 本発明に係る厚鋼板の製造列に用いる水切りロールスタンドの構造の一例を説明する図。The figure explaining an example of the structure of the draining roll stand used for the manufacture row | line | column of the thick steel plate which concerns on this invention.

本発明は、厚鋼板を熱間圧延し、プリレベラーで形状矯正した後、強制冷却装置で焼入れや加速冷却する前に、デスケーリング装置の入側に配置した水切りロールにより、スケールが含まれたデスケーリング水が鋼板表面上を流れて熱間矯正を行なう部位に達することを防止し、また、水切りロールで検出する形状矯正後の鋼板形状、特に鋼板長さ方向反りを基にデスケーリング装置を制御し、スケール剥離性能を向上させ優れた表面性状とすることを特徴とする。   In the present invention, a steel plate is hot-rolled and straightened with a pre-leveler, and before quenching or accelerated cooling with a forced cooling device, a desiccant roll containing a scale is provided by a draining roll placed on the entry side of the descaling device. The scaling water is prevented from flowing on the surface of the steel sheet and reaching the part where hot correction is performed, and the descaling device is controlled based on the steel sheet shape after shape correction detected by the draining roll, especially the warpage in the length direction of the steel sheet. In addition, it is characterized in that the scale peeling performance is improved and the surface properties are excellent.

図１は、本発明の適用に好適なデスケーリング装置の構成を示す模式図で、図において１ａ，１ｂは上下一対のロールからなる水切りロール、２はヘッダーと複数のノズルを有するデスケーリング装置、３はデスケーリング水、４は搬送ロール、５はデスケーリングされる鋼板、矢印ａは鋼板５の進行方向を示す。以下の説明において、鋼板５は搬送ロール４の上を矢印ａの方向に進行するものとし、進行方向は上流側から下流側とする。尚、水切りロール１ａ，１ｂは図示しないロールスタンドで支持されている。以下の説明において上流側を前方、下流側を後方と呼ぶ場合もある。   FIG. 1 is a schematic diagram showing a configuration of a descaling apparatus suitable for application of the present invention, in which 1a and 1b are draining rolls comprising a pair of upper and lower rolls, 2 is a descaling apparatus having a header and a plurality of nozzles, 3 is descaling water, 4 is a transport roll, 5 is a steel plate to be descaled, and arrow a indicates the traveling direction of the steel plate 5. In the following description, the steel plate 5 travels on the transport roll 4 in the direction of arrow a, and the traveling direction is from the upstream side to the downstream side. The draining rolls 1a and 1b are supported by a roll stand (not shown). In the following description, the upstream side may be referred to as the front and the downstream side may be referred to as the rear.

本発明に係る厚鋼板の製造方法では、鋼板５を強制冷却装置（図示しない）に搬入する前に、水切りロール１ａ，１ｂを前後に備えたデスケーリング装置２で鋼板５のデスケーリングを行う。   In the method for manufacturing a thick steel plate according to the present invention, the steel plate 5 is descaled by the descaling device 2 having the draining rolls 1a and 1b before and after the steel plate 5 is carried into a forced cooling device (not shown).

デスケーリング装置２から上流側に向かって噴出するデスケーリング水３は鋼板５の上を伝わっていく。もし上流側に水切りロール１ｂが配置されていないと、デスケーリング水３は、デスケーリング装置２の上流側に配置されたプリレベラー（図示しない）に流れ込む。このとき、プリレベラー（図示しない）に流れ込んだデスケーリング水３にはスケールが含まれるので、デスケーリング水３が表面を覆う鋼板５をプリレベラー（図示しない）で矯正するとスケールを噛みこんで表面疵が生じる。   The descaling water 3 ejected from the descaling device 2 toward the upstream side travels on the steel plate 5. If the draining roll 1b is not arranged on the upstream side, the descaling water 3 flows into a pre-leveler (not shown) arranged on the upstream side of the descaling device 2. At this time, the descaling water 3 that has flowed into the pre-leveler (not shown) contains scales. Therefore, when the steel plate 5 covering the surface of the descaling water 3 is corrected with the pre-leveler (not shown), the scale is bitten and the surface flaws are formed. Arise.

そこで、本発明では、上流側に水切りロール１ｂを配置したデスケーリング装置２を用いて、デスケーリング水３がプリレベラー（図示しない）に流れ込むことを防止してデスケーリングを行った後、鋼板５の強制冷却（焼入れまたは加速冷却）を行う。   Therefore, in the present invention, using the descaling device 2 in which the draining roll 1b is arranged on the upstream side, the descaling water 3 is prevented from flowing into a pre-leveler (not shown), and then descaling is performed. Perform forced cooling (quenching or accelerated cooling).

デスケーリング装置２は強制冷却時にデスケーリング水３が滞留することを防止して所望の冷却状態を得るため、下流側にも水切りロール１ａを配置する。   In order to prevent the descaling water 3 from staying during the forced cooling and to obtain a desired cooling state, the descaling device 2 also arranges a draining roll 1a on the downstream side.

更に、熱間矯正後で鋼板に変形、例えば上下方向の変形である反りが残った場合でも最もデスケーリング効果の大きいデスケーリング水の圧力と噴射範囲が得られるようにデスケーリング装置２のデスケーリングノズルと鋼板表面の間隔を制御する。   Furthermore, even when the steel sheet is deformed after hot straightening, for example, when warping, which is a deformation in the vertical direction, remains, the descaling of the descaling device 2 is performed so that the pressure and spray range of the descaling water having the greatest descaling effect can be obtained. Control the distance between the nozzle and the steel plate surface.

そのため、本発明では、デスケーリング装置の前方（上流側）に配置される水切りロールにロール軸芯の高さ方向の移動量を検出する機構を設けて、ロール軸芯の高さ方向の移動量に応じてデスケーリングノズルを上下方向に移動させて鋼板表面との間隔を制御する。   Therefore, in this invention, the mechanism which detects the moving amount | distance of the height direction of a roll axial center is provided in the draining roll arrange | positioned ahead (upstream side) of a descaling apparatus, The moving amount | distance of the height direction of a roll axial center Accordingly, the distance from the steel sheet surface is controlled by moving the descaling nozzle in the vertical direction.

また、本発明は、仕上げ圧延機（図示しない）の下流側に、プリレベラー（図示しない）を備えた強制冷却装置（図示しない）を配した厚鋼板の製造装置列であって、前記プリレベラーの下流側であって前記強制冷却装置の上流側に、その前後に水切りロール１ａ，１ｂを備えたデスケーリング装置２を配置したことを特徴とする厚鋼板の製造装置である。   Further, the present invention is a steel plate manufacturing apparatus row in which a forced cooling device (not shown) provided with a pre-leveler (not shown) is arranged on the downstream side of a finish rolling mill (not shown), downstream of the pre-leveler. This is a thick steel plate manufacturing apparatus in which a descaling device 2 including draining rolls 1a and 1b is arranged before and after the forced cooling device on the upstream side.

図２はデスケーリング装置２の前方に配置される水切りロールスタンドの構造の一例を説明する図で、ロール軸受け７と水切りロール１ｂを支持する枠体の上下の端部８の間に検出器６を設け、ロール軸受け７の高さ方向の移動量を検出する。検出器６はデスケーリング水の影響などを受けないようにリニアポテンシャルなどの機械式検出機構を備えるものを使用する。熱間矯正後の鋼板形状をより正確に検出できるように、上下に検出器６を取り付けることが望ましい。   FIG. 2 is a diagram for explaining an example of the structure of a draining roll stand disposed in front of the descaling device 2, and a detector 6 between the upper and lower ends 8 of the frame body supporting the roll bearing 7 and the draining roll 1b. And detecting the amount of movement of the roll bearing 7 in the height direction. A detector 6 having a mechanical detection mechanism such as a linear potential is used so as not to be affected by descaling water. It is desirable to attach the detectors 6 up and down so that the shape of the steel plate after hot correction can be detected more accurately.

デスケーリング装置２の前後に配置された水切りロール１ａ，１ｂは、デスケーリングを必要としない鋼板が通過する場合、上方に退避するように昇降可能とすることが望ましい。   It is desirable that the draining rolls 1a and 1b arranged before and after the descaling device 2 can be lifted and lowered so as to retract upward when a steel plate that does not require descaling passes.

水切りロール１ｂの設置位置がデスケーリング装置２に近接し、両者の間の距離ｌ２が短い場合、デスケーリング装置２と水切りロール１ｂの間の鋼板５の上面に水溜りができ、デスケーリング水３の鋼板への衝突圧が低下する。従って距離ｌ２は許容される衝突圧の低下量を考慮して設定する。 When the installation position of the draining roll 1b is close to the descaling device 2 and the distance 12 between the two is short, a water pool can be formed on the upper surface of the steel plate 5 between the descaling device 2 and the draining roll 1b. The impact pressure on the steel plate 3 decreases. Accordingly, the distance l 2 is set in consideration of the allowable decrease in the collision pressure.

一方、デスケーリング装置２から上流側に向かってデスケーリング水を噴出する場合、通常、デスケーリング装置の下流側に水切りロールを配置することはないが、本発明においては、デスケーリング装置の下流側に水切りロール１ａを配置する。   On the other hand, when the descaling water is ejected from the descaling device 2 toward the upstream side, normally, a draining roll is not disposed on the downstream side of the descaling device. The draining roll 1a is disposed on the surface.

そして、水切りロール１ａの設置位置とデスケーリング装置２との距離ｌ１は、可能な限り短いことが好ましい。これは、以下の理由による。 The distance l 1 between the installation position of the draining roll 1a and the descaling device 2 is preferably as short as possible. This is due to the following reason.

すなわち、デスケーリング装置２より下流側では、鋼板の上面にのみデスケーリング水が滞留しうるため、鋼板上面のほうが下面よりも冷やされやすい。こうして発生しうる強制冷却前の鋼板上下面での温度差を小さくするため、距離ｌ１は、可能な限り短くすることが好ましい。 That is, since the descaling water can stay only on the upper surface of the steel plate on the downstream side of the descaling device 2, the upper surface of the steel plate is more easily cooled than the lower surface. In order to reduce the temperature difference between the upper and lower surfaces of the steel sheet before forced cooling that can occur in this way, the distance l 1 is preferably as short as possible.

なお、水切りロール１ｂ方向に流れ込むデスケーリング水３の水量はデスケーリングノズルの配置方法、設置角度などに影響され、また鋼板５の上のデスケーリング水３の溜まり水の液面高さが衝突圧に及ぼす影響は、デスケーリング装置２の基本設計仕様の衝突圧に依存するものであるため、事前に実験的手法により求めておく。   The amount of descaling water 3 flowing in the direction of the draining roll 1b is affected by the arrangement method, the installation angle, etc. of the descaling nozzle, and the level of the accumulated water in the descaling water 3 on the steel plate 5 is the collision pressure. Since the influence on the pressure depends on the collision pressure of the basic design specification of the descaling apparatus 2, it is obtained in advance by an experimental method.

１ａ，１ｂ 水切りロール
２ デスケーリング装置
３ デスケーリング水
４ 搬送ロール
５ 鋼板
６ 検出器
７ ロール軸受け
８ 端部
ａ 矢印 1a, 1b Draining roll 2 Descaling device 3 Descaling water 4 Transport roll 5 Steel plate 6 Detector 7 Roll bearing 8 End a arrow

Claims (2)

表面性状に優れた厚鋼板の製造方法であって、熱間圧延後、プリレベラーで形状矯正した後、水切りロールを前後に備えたデスケーリング装置でデスケーリングして、強制冷却するとともに、形状矯正後の鋼板形状を、前記デスケーリング装置の前方となる水切りロールで検出し、前記デスケーリング装置を制御することを特徴とする表面性状に優れた厚鋼板の製造方法。   It is a manufacturing method of thick steel plate with excellent surface properties, after hot rolling, after shape correction with a pre-leveler, descaling with a descaling device equipped with draining rolls at the front and back, forcibly cooling, and after shape correction A method for producing a thick steel plate having excellent surface properties, wherein the shape of the steel plate is detected by a draining roll in front of the descaling device, and the descaling device is controlled. 仕上げ圧延機の下流側に、プリレベラーおよび強制冷却装置を配した厚鋼板の製造装置列であって、前記プリレベラーと前記強制冷却装置の間に、その前後に水切りロールを備えたデスケーリング装置を配し、前記デスケーリング装置の前方の水切りロールはロール軸芯の高さ方向の移動量を検出する機構を有していることを特徴とする厚鋼板の製造装置列。   A steel plate manufacturing apparatus line having a pre-leveler and a forced cooling device disposed downstream of the finish rolling mill, and a descaling device having water draining rolls disposed before and after the pre-leveler and the forced cooling device. And the draining roll ahead of the said descaling apparatus has a mechanism which detects the moving amount | distance of the height direction of a roll axial center, The manufacturing apparatus row | line | column of the thick steel plate characterized by the above-mentioned.
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Publication number Priority date Publication date Assignee Title
CN112246047A (en) * 2020-09-28 2021-01-22 安徽广达金属科技有限公司 Descaling device for galvanized steel sheet production line and use method thereof

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JP2010029896A (en) * 2008-07-28 2010-02-12 Ihi Corp Rolling apparatus, and control method for rolling apparatus
JP2010099725A (en) * 2008-10-27 2010-05-06 Jfe Steel Corp Method for manufacturing thick steel plate excellent in surface characteristic, and manufacturing apparatus line

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JP2010029896A (en) * 2008-07-28 2010-02-12 Ihi Corp Rolling apparatus, and control method for rolling apparatus
JP2010099725A (en) * 2008-10-27 2010-05-06 Jfe Steel Corp Method for manufacturing thick steel plate excellent in surface characteristic, and manufacturing apparatus line

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112246047A (en) * 2020-09-28 2021-01-22 安徽广达金属科技有限公司 Descaling device for galvanized steel sheet production line and use method thereof

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