JPS62124017A - Descaling method for hot rolled steel plate - Google Patents

Descaling method for hot rolled steel plate

Info

Publication number
JPS62124017A
JPS62124017A JP60261294A JP26129485A JPS62124017A JP S62124017 A JPS62124017 A JP S62124017A JP 60261294 A JP60261294 A JP 60261294A JP 26129485 A JP26129485 A JP 26129485A JP S62124017 A JPS62124017 A JP S62124017A
Authority
JP
Japan
Prior art keywords
hot
rolled steel
scale
steel sheet
descaling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP60261294A
Other languages
Japanese (ja)
Inventor
Kozaburo Ichida
市田　弘三郎
Susumu Yamaguchi
進 山口
Mitsutaka Sudo
須藤　充孝
Fumiichiro Chikasawa
近澤　文一郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP60261294A priority Critical patent/JPS62124017A/en
Priority to KR1019860001735A priority patent/KR900007072B1/en
Priority to CA000504111A priority patent/CA1268932A/en
Priority to ES553020A priority patent/ES8703756A1/en
Priority to EP86103479A priority patent/EP0195385B1/en
Priority to AT86103479T priority patent/ATE65721T1/en
Priority to BR8601145A priority patent/BR8601145A/en
Priority to DE8686103479T priority patent/DE3680560D1/en
Publication of JPS62124017A publication Critical patent/JPS62124017A/en
Priority to US07/143,311 priority patent/US4872245A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B21B45/06—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 of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B2038/004—Measuring scale thickness

Abstract

PURPOSE:To reduce a production cost by controlling an elongation percentage to give to a steel plate based on the production conditions, properties of surface scale and quantity, etc., of the hot rolled steel plate. CONSTITUTION:Scale detecting devices 21, 22 are installed on outlet sides of an welding machine 2 and a pickling tank 12 respectively and a control computer 23 and controller 24 are installed. A host computer and the scale detecting devices 21, 22 are connected to the computer 23 separately. The data of manufacturing conditions of the hot rolling coil from the host computer and the scale properties, quantity, etc., from the detecting device 21 are inputted into the computer 23. Then, a tension leveler 5 is operated to control a minimum required value of the elongation percentage to be given to the hot rolling steel plate (H). In this way, the production cost such as a cost of electric power and rolling cost are reduced.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は熱延鋼板表面に生成したスケ−・ルの除去方法
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for removing scale generated on the surface of a hot rolled steel sheet.

（従来の技術） 熱延鋼板を冷間圧延する場合、製品の表面性状を損なわ
ないために、熱延鋼板の表面に付着したスケールを冷間
圧延前に除去する必要がある。(Prior Art) When hot-rolled steel sheets are cold-rolled, it is necessary to remove scale attached to the surface of the hot-rolled steel sheets before cold rolling in order not to impair the surface properties of the product.

従来、スケールを低コストで除去するための方法として
、たとえば次のような方法が提案されている。特開昭５
Ｇ−８９３１８号公報に開示された方法では、４重圧延
機により熱延鋼板を圧延して表面スケールを破砕した後
、酸洗を行なう、特開昭５０−１２７８３５号公報およ
び特公昭５７−１４２７１０号公報に開示さた方法では
、４重圧延機により圧延するとともに圧延によって破砕
されたスケールを表面研掃材で除去し、その後軽度の酸
洗または液体ホーニング等からなる脱スケール処理を施
す。また、特開昭５８−２０１３４１５号公報に開示さ
れた方法では、テンションレベラーにより表面スケール
を破砕した後、酸洗を行なう。Conventionally, the following method has been proposed as a method for removing scale at low cost. Japanese Patent Application Publication No. 5
In the method disclosed in Japanese Patent Publication No. G-89318, a hot-rolled steel plate is rolled using a quadruple rolling mill to crush surface scale, and then pickling is performed. In the method disclosed in the publication, the material is rolled using a quadruple rolling mill, and the scale crushed by the rolling is removed using a surface abrasive, and then a descaling treatment consisting of light pickling or liquid honing is performed. Further, in the method disclosed in Japanese Patent Application Laid-open No. 58-2013415, pickling is performed after surface scale is crushed by a tension leveler.

これらの方法は、いずれも鋼板スケールを機械的に破砕
する工程があり、この工程には上述のように４重圧延機
あるいはテンションレベラーが適用されている。４ｍ圧
延機あるいはテンションレベラーは、熱延鋼板に軽度の
圧下あるいは引張りにより伸びを与え、脆いスケールに
亀裂を生じさせ、これを破砕する。ついで、破砕スケー
ルを熱延鋼板表面から除去する。All of these methods include a step of mechanically crushing the steel plate scale, and a quadruple rolling mill or a tension leveler is applied to this step as described above. The 4m rolling mill or tension leveler applies elongation to the hot-rolled steel plate by slight reduction or tension to generate cracks in brittle scales and crush them. Then, the crushed scale is removed from the surface of the hot rolled steel sheet.

（発明が解決しようとする問題点） ところが、上記従来の方法には次の様な欠点があった。(Problem that the invention attempts to solve) However, the above conventional method has the following drawbacks.

すなわち、脱スケール性はスケール組成、スケール中の
空孔および亀裂の多少、スケールの厚さに左右され、熱
延鋼板の製造条件によって大きく変化する。したがって
、脱スケール性に応じて熱延鋼板に伸びを与えないと、
続く破砕スケールの除去工程で過度に地鉄を侵したり、
あるいはスケールが鋼板表面に残ったりする。たとえば
、最も脱スケール性の悪い熱延鋼板に合せて伸びを鋼板
に与えると、酸洗性の良い鋼種あるいは鋼板長手方向で
酸洗性の良い部分については地鉄を過剰に溶解すること
になる。しかし、従来の方法では脱スケール性に応じて
熱延鋼板に伸びを与えるようにはしていなかった。した
がって、伸びが不足して与えられると、スケールが付着
した鋼板が冷間圧延に供されて製品の表面性状を損なわ
れる。That is, the descaling property depends on the scale composition, the number of pores and cracks in the scale, and the thickness of the scale, and varies greatly depending on the manufacturing conditions of the hot rolled steel sheet. Therefore, if elongation is not given to the hot rolled steel sheet in accordance with descaling properties,
In the subsequent crushing scale removal process, the base steel is excessively eroded,
Or scale may remain on the surface of the steel plate. For example, if elongation is given to the steel plate to match the hot-rolled steel plate with the worst descaling properties, the base metal will be excessively dissolved for steel types that have good pickling properties or parts that have good pickling properties in the longitudinal direction of the steel plate. . However, conventional methods do not provide elongation to hot-rolled steel sheets in accordance with descaling properties. Therefore, if insufficient elongation is applied, the steel plate with scale attached will be subjected to cold rolling and the surface quality of the product will be impaired.

逆に、過度の伸びが与えられると、スケール破砕圧延機
あるいはテンションレベラーなどに余分の動力を要して
電力コストがむだになっていた。On the other hand, if excessive elongation is applied, extra power is required for scale crushing rolling mills, tension levelers, etc., resulting in wasted electricity costs.

そこで、本発明は以上のような従来技術の問題点を解決
するためになされたもので、操業コストが低く、効率の
良く確実にスケールを除去することができる熱延鋼板の
脱スケール方法を提供するものである。Therefore, the present invention has been made to solve the problems of the prior art as described above, and provides a method for descaling hot rolled steel sheets that has low operating costs and can efficiently and reliably remove scale. It is something to do.

（問題点を解決するための手段） この発明の熱延鋼板の脱スケール方法は、熱延鋼板を送
りながらこれに伸びを与えて熱延鋼板表面のスケールを
破砕し、ついで破砕スケールを熱延鋼板表面から除去す
る。上記伸び率は、熱延鋼板の製造条件もしくは熱延鋼
板表面スケールの性状および量、または熱延鋼板の製造
条件ならびに熱延鋼板表面スケールの性状および量に基
づきフィードフォワード制御される。ここで、表面スケ
ールの性状はスケールの組成（ＦｅＯ，Ｆｅ３Ｏ４，Ｆ
ｅ２Ｏ３の比率）やクラックの密度などにより決められ
る。(Means for Solving the Problems) The method for descaling a hot rolled steel plate of the present invention is to crush the scale on the surface of the hot rolled steel plate by giving elongation to the hot rolled steel plate while feeding it, and then remove the crushed scale from the hot rolled steel plate. Remove from the steel plate surface. The elongation rate is feedforward controlled based on the manufacturing conditions of the hot-rolled steel sheet or the properties and amount of the hot-rolled steel sheet surface scale, or the manufacturing conditions of the hot-rolled steel sheet and the properties and amount of the hot-rolled steel sheet surface scale. Here, the properties of the surface scale are determined by the scale composition (FeO, Fe3O4, F
It is determined by the ratio of e2O3) and the density of cracks.

スケールの破砕は、圧延機、テンションレベラー、ロー
ラーレベラーなど熱延鋼板に伸びを４える装置により行
なわれる。The scale is crushed using a device such as a rolling mill, a tension leveler, or a roller leveler that imparts elongation to the hot-rolled steel plate.

第１図はテンションレベラーおよび圧延機によってそれ
ぞれ鋼板に与えた伸び率と脱スケール時間短縮率との関
係の一例を示している。ここで、脱スケール時間短縮率
は（ＴＲ／Ｔｏ）Ｘ　１００％で定義し、↑０は鋼板に
伸びを与えない場合の脱スケール時間、　ＴＲは伸びを
与えた後の脱スケール時間をＴＲである。同図により明
らかなように、伸び率７．０ｚ以上では脱スケール時間
が飽和する。したがって、伸び率は７．０ｚ以下である
ことが望ましい。勿論、伸び率は少なくともスケールを
十分に除去できる程度の亀裂を熱延鋼板に与えるもので
なければならない。FIG. 1 shows an example of the relationship between the elongation rate given to the steel plate by the tension leveler and the rolling mill, and the descaling time reduction rate. Here, the descaling time reduction rate is defined as (TR/To) x 100%, ↑0 is the descaling time when no elongation is applied to the steel plate, and TR is the descaling time after elongation is applied. be. As is clear from the figure, when the elongation rate is 7.0z or more, the descaling time is saturated. Therefore, it is desirable that the elongation rate is 7.0z or less. Of course, the elongation rate must be such that the hot rolled steel sheet is at least sufficiently cracked to remove scale.

破砕スケールの除去は、ブラシ研削、酸洗、湿式ブラス
ト、および乾式ブラストのうちの少なくとも一つにより
行なわれる。すなわち、これらの手段をそれぞれ単独で
行なってもよい。また、脱スケール性が悪い場合には、
たとえばブラシ研削と酸洗、あるいは酸洗と湿式ブラス
トなどのように二つの手段を組み合せて行なってもよい
。Removal of fracture scale is performed by at least one of brush grinding, pickling, wet blasting, and dry blasting. That is, each of these means may be performed independently. In addition, if descaling performance is poor,
For example, the two methods may be combined, such as brush grinding and pickling, or pickling and wet blasting.

上記スケール破砕およびスケール除去は、冷間圧延工程
あるいは連続焼鈍工程とは独立して、すなわちこれらの
工程のオフラインで実施してもよい。また、冷間圧延あ
るいは冷間圧延および連続焼鈍の前でこれら工程に連続
するようにして実施してもよい。The scale crushing and scale removal described above may be performed independently of the cold rolling process or the continuous annealing process, that is, offline from these processes. Further, the step may be carried out in succession to these steps before cold rolling or cold rolling and continuous annealing.

上記伸び制御の基準となる熱延鋼板の製造条件は熱延捲
取温度条件、冷却条件、鋼種、仕上出口温度、滞貨日数
、積み状況などであり、これらの内から幾つかが組み合
されて、たとえば熱延捲取温度条件、冷却条件および鋼
種が用いられる。これら製造条件は熱間圧延工場のホス
トコンピュータなどから転送されてきたデーターを用い
る。熱延鋼板表面スケールの性状および量は、脱スケー
ル設備の入側に設置された検出器により得られる。これ
らデーターに基づき、スケール破砕圧延機の圧下量、テ
ンションレベラーの引張力、あるいはローラーレベラー
のロール押込み量を調整する。これらの調整は熱延コイ
ルごとに、あるいは１本の熱延コイル内において時々刻
々行なう。The manufacturing conditions for hot-rolled steel sheets that serve as standards for the elongation control described above include hot-rolling temperature conditions, cooling conditions, steel type, finishing outlet temperature, number of storage days, and loading conditions, and some of these may be combined. For example, hot-rolling temperature conditions, cooling conditions, and steel type are used. These manufacturing conditions use data transferred from the host computer of the hot rolling mill. The properties and amount of scale on the surface of a hot rolled steel sheet are obtained by a detector installed on the entry side of the descaling equipment. Based on these data, the rolling reduction amount of the scale crushing rolling mill, the tensile force of the tension leveler, or the roll pushing amount of the roller leveler are adjusted. These adjustments are made for each hot-rolled coil or within one hot-rolled coil from time to time.

（作用） 熱延鋼板を送りながらこれに伸びを与えると、熱延鋼板
の表面に付着した脆いスケールは伸びに対し直角方向に
亀裂を生じ、破砕される。破砕されたスケールは地鉄と
スケールとの境界面やスケール層内に酸が浸透し易くな
り、酸洗により熱延鋼板表面から容易に剥離する。また
、上記亀裂のためにブラッシングあるいはショツトブラ
ストによっても熱延鋼板表面から容易に剥離する。(Function) When elongation is applied to a hot-rolled steel sheet while being fed, the brittle scale adhering to the surface of the hot-rolled steel sheet cracks in a direction perpendicular to the elongation and is crushed. The crushed scale allows acid to easily penetrate into the interface between the base iron and the scale and into the scale layer, and is easily peeled off from the surface of the hot rolled steel sheet by pickling. Further, due to the above-mentioned cracks, the hot rolled steel sheet is easily peeled off from the surface even by brushing or shot blasting.

前記伸び率の制御において、たとえば熱延鋼板の製造条
件から、あるいはスケール検出結果からスケールの付着
量が多い、あるいはスケールの剥離性が悪いとすると、
これらのデーターに基づきスケール破砕圧延機の圧下量
、テンションレベラーの引張力、あるいはローラーレベ
ラーのロール押込み量は増加される。In controlling the elongation rate, for example, if the manufacturing conditions of the hot rolled steel sheet or the scale detection results indicate that there is a large amount of scale attached, or that the peelability of scale is poor,
Based on these data, the rolling reduction amount of the scale crushing rolling mill, the tensile force of the tension leveler, or the roll pushing amount of the roller leveler are increased.

（実施例） 第２図は本発明の実施する設備の一例を示している。(Example) FIG. 2 shows an example of equipment for implementing the present invention.

ペイオフリール１に続いて先行する熱延コイルＨと後続
の熱延コイルＨを接続する溶接機２、入側ループカー３
．テンションレベラー５、ブラシロールｌＯ１酸洗槽１
２、ホットリンスタンク１３、乾燥機１４、出側ループ
カー１６およびテンションリール！８が順次配列されて
いる。上記溶接４！１２および酸洗槽１２の出側にはス
ケール検出器２１．２２がそれぞれ配置されている。ま
た、制御コンピューター２３およびこれに接続されたコ
ントローラー２４を備えており、制御コンピューター２
３にはホストコンピューター　（図示しない）および上
記スケール検出器２１が接続されている。テンションレ
ベラー５は入側プライドル６、ワークロール７および出
側プライドル８とから構成されている。Welding machine 2 that connects the hot-rolled coil H that precedes the payoff reel 1 and the hot-rolled coil H that follows, and the entry side loop car 3
．． Tension leveler 5, brush roll 1O1 pickling tank 1
2. Hot rinse tank 13, dryer 14, outlet loop car 16 and tension reel! 8 are arranged in sequence. Scale detectors 21 and 22 are arranged at the exit sides of the welding tank 4!12 and the pickling tank 12, respectively. It also includes a control computer 23 and a controller 24 connected thereto.
3 is connected to a host computer (not shown) and the scale detector 21 mentioned above. The tension leveler 5 is composed of an inlet prydle 6, a work roll 7, and an outlet prydle 8.

ペイオフリール１で巻きほどかれた熱延鋼板Ｈは入側ル
ープカー３に蓄積された後、テンションレベラ−５で７
．０ｚ以下の伸びを与えられブラシロール１０で剥離し
かけた表面スケールを研掃される。ついで、熱延鋼板Ｈ
は酸洗層１２で酸洗され、ホットリンスタンク１３、ド
ライヤー１４、出側ループカー１６を通ったあとテンシ
ョンリール１８で巻き取られる。The hot-rolled steel sheet H unwound on the payoff reel 1 is accumulated on the entry side loop car 3, and then the tension leveler 5
．． The surface scale which has been elongated to 0z or less and is about to peel off is polished off by the brush roll 10. Then, hot rolled steel sheet H
is pickled in a pickling layer 12, passed through a hot rinse tank 13, a dryer 14, and an exit loop car 16, and then wound up on a tension reel 18.

この、とき、熱延コイルの製造条件のデーターａをホス
トコンピューターから、またスケール性状Φ量等のデー
ターｂを上記スケール検出器２１から制御コンピュータ
ー２３に入力する。酸洗能力に余裕がある場合には、テ
ンションレベラー５のワークロール７のインターメツシ
ュおよび入、出側プライドル６．８のロール回転速度差
の少なくとも一方を変化させて、熱延鋼板Ｈに与える伸
び率を所定の時間で脱スケールを終え、酸洗不良が発生
しない最小に制御する。At this time, data a on the manufacturing conditions of the hot rolled coil is input from the host computer, and data b on the scale properties Φ amount etc. are input from the scale detector 21 to the control computer 23. If there is sufficient pickling capacity, at least one of the intermesh of the work roll 7 of the tension leveler 5 and the roll rotation speed difference between the inlet and outlet priddles 6.8 may be changed to apply the same to the hot rolled steel sheet H. The elongation rate is controlled to a minimum value so that descaling is completed within a predetermined time and pickling failure does not occur.

つぎに、スケール破砕およびスケール除去に引続いて冷
間圧延および連続焼鈍を連続して行なう例について説明
する。第３図はその設備を示しており、第２図に示す装
置と同様の装置には同一の参照符号を付け、その説明は
省略する。Next, an example will be described in which scale crushing and scale removal are followed by cold rolling and continuous annealing. FIG. 3 shows the equipment, and devices similar to those shown in FIG. 2 are given the same reference numerals and their explanation will be omitted.

前記出側ループカー１６に続いて冷間圧延機列２６、電
気清浄装置２８、入側ループカー３０、連続焼鈍装置３
２．焼鈍済冷延板の後処理装置３４、出側／ｌ／　−フ
カ−３６，スキンパスミル３８、およびテンションリー
ル４０か順次配列されている。」−記設備において、酸
洗された熱延鋼板Ｈは直ちに冷間圧延および連続焼鈍さ
れる。Following the exit loop car 16 are a cold rolling mill row 26, an electric cleaning device 28, an entry loop car 30, and a continuous annealing device 3.
2. A post-processing device 34 for annealed cold-rolled sheets, an outlet/l/-hooker 36, a skin pass mill 38, and a tension reel 40 are arranged in this order. In the equipment mentioned above, the pickled hot rolled steel sheet H is immediately cold rolled and continuously annealed.

上記設備において、スケール除去のために熱延鋼板Ｈに
与える最適の伸びは次のようにして求める。第４図は最
適の伸びを求める手順を示すフローチャートである。In the above equipment, the optimum elongation given to the hot rolled steel sheet H for scale removal is determined as follows. FIG. 4 is a flowchart showing the procedure for determining the optimum elongation.

まず、制御コンピューターに熱延鋼板の鋼種。First, the steel type of the hot rolled steel plate is sent to the control computer.

冷却条件、および巻取り温度を初期設定する。ついで、
ホストコンピューターからのデーターにより処理する熱
延鋼板の鋼種、冷却条件、および巻取り温度が変更され
たか、どうかを順次判断する。変更があれば、変更され
たものに設定し直す。つぎに、前記スケール検出器２１
により検出されたスケールの性状および量が制御コンピ
ューター２３に入力されるとともに、ホストコンピュー
ターから連続焼鈍装置３２の通板速度を加味した冷間圧
延機２６人側の速度が入力される。上記データーにノＳ
づき所要の伸び率を計算する。このとき、まず圧延機入
側の速度から酸洗速度を求め、この酸洗速度に応じた伸
び率を求める。第５図は伸び率を求める線図の一例を示
している。種々の条件に従って多数の線図が予め求めら
れており、制御コンピューター２３に記憶されている。Initialize cooling conditions and winding temperature. Then,
Based on data from the host computer, it is sequentially determined whether the steel type, cooling conditions, and coiling temperature of the hot-rolled steel sheet to be processed have been changed. If there is a change, reset the settings to the changed one. Next, the scale detector 21
The properties and amount of scale detected by the above are input to the control computer 23, and the speed of the cold rolling mill 26, which takes into account the sheet passing speed of the continuous annealing device 32, is input from the host computer. The above data
Calculate the required growth rate. At this time, first, the pickling speed is determined from the speed at the entrance of the rolling mill, and the elongation rate is determined according to this pickling speed. FIG. 5 shows an example of a diagram for determining the elongation rate. A large number of diagrams have been determined in advance according to various conditions and are stored in the control computer 23.

冷却条件（この例では、急冷または徐冷）および巻取り
温度が指定されれば、これらの線図から所要の伸び率が
求められる。求められた伸び率Ｃは制御コンピューター
２３からコントローラー２４に出力される。コントロー
ラー２４は伸び率に基づき所要の張力ｄをテンションレ
ベラー５に出力する。Once the cooling conditions (in this example, rapid cooling or slow cooling) and winding temperature are specified, the required elongation rate can be determined from these diagrams. The determined elongation rate C is output from the control computer 23 to the controller 24. The controller 24 outputs the required tension d to the tension leveler 5 based on the elongation rate.

上記実施例ではスケール破砕およびスケール除去に引続
いて冷１７Ｊ１圧延および連続焼鈍を連続して行なった
が、スケール除去に引き続いて冷間圧延のみを行なうよ
うにしてもよい。この場合には、第３図のＡの位置にテ
ンションリールが設けられる。また、冷間圧延機の入側
速度が制御コンピューターに入力され、伸び率の計算に
用いられる。In the above embodiment, scale crushing and scale removal were followed by cold 17J1 rolling and continuous annealing, but scale removal may be followed by only cold rolling. In this case, a tension reel is provided at position A in FIG. Additionally, the entry speed of the cold rolling mill is input to the control computer and used to calculate the elongation rate.

つぎに、」−記フイードフォワード制御に加えて更にフ
ィードパ・ンク制御を行なって伸び率を調整し、スケー
ルを除去する方法について説明する。Next, a method of adjusting the elongation rate and removing scale by performing feed punch control in addition to the feed forward control described above will be explained.

第６図は伸び率を制御する手順を示すフローチャートで
ある。伸び率を出力するまでは前記実施例と同じである
。前記スケール検出器２２により検出されたスケールの
破砕および除去状況が制御コンピューター２３に入力さ
れ、制御コンピューター２３はこれら状況からスケール
が残留しているか、どうかを判断する。スケールが残留
しておれば、現在テンションレベラー５に出力中の張力
を増し、熱延鋼板Ｈに実える伸び率をｏ、ｉｘ増加する
。以下、この伸び率増加の操作はスケールが十分に除去
されるまで繰り返される。なお、スケール除去状況の検
出はスケール検出温による自動検出によらずに、ＩＴＶ
による間接目視観察、あるいは検査員による直接目視観
察によってもよい。FIG. 6 is a flowchart showing the procedure for controlling the elongation rate. The process is the same as in the previous embodiment until the elongation rate is output. The scale crushing and removal status detected by the scale detector 22 is input to the control computer 23, and the control computer 23 determines whether scale remains or not based on these statuses. If scale remains, the tension currently being output to the tension leveler 5 is increased, and the elongation rate of the hot rolled steel sheet H is increased by o, ix. Thereafter, this operation of increasing the elongation rate is repeated until the scale is sufficiently removed. Note that the scale removal status is not detected automatically by scale detection temperature, but by ITV.
Indirect visual observation by an inspector, or direct visual observation by an inspector.

（発明の効果） この発明によると、常に適切なスケール除去のだめの伸
びが熱延鋼板に与えられる。したがって、残留スケール
によって冷延鋼板の表面性状が損なわれることはなく、
またスケール破砕圧延機あるいはテンションレベラーな
どに余分の動力を要することもない。(Effects of the Invention) According to the present invention, an appropriate elongation for removing scale is always given to the hot rolled steel sheet. Therefore, the surface quality of cold-rolled steel sheets is not impaired by residual scale, and
Further, no extra power is required for a scale crushing rolling mill or a tension leveler.

第７図〜第９図はそれぞれ電力コストおよびロールコス
トについて従来法と本発明とを比較している。第７図は
酸洗、乾燥までの工程の場合（第２図に示す設備による
場合）で、図から明らかな様に本発明の実施により電力
コストが約２５％、ロールコストが約５ｚ節減できた。7 to 9 compare the conventional method and the present invention in terms of power cost and roll cost, respectively. Figure 7 shows the process from pickling to drying (using the equipment shown in Figure 2).As is clear from the figure, by implementing the present invention, the electricity cost can be reduced by about 25% and the roll cost can be reduced by about 5z. Ta.

また、第８図は冷間圧延まで連続した工程の場合で、本
発明の実施により電力コストが約２ｏｚ、ロールコスト
が約７ｚ節減できた。さらに、第９図は連続焼鈍まで連
続した工程の場合で、本発明の実施により電力コストが
約２５ｚ、ロールコストが約１（１％節減できた。Moreover, FIG. 8 shows the case of the continuous process up to cold rolling, and by implementing the present invention, the electric power cost was reduced by about 2 oz and the roll cost was reduced by about 7 oz. Furthermore, FIG. 9 shows the case of a continuous process including continuous annealing, and by implementing the present invention, the electric power cost was reduced by about 25z, and the roll cost was reduced by about 1% (1%).

【図面の簡単な説明】[Brief explanation of drawings]

第１図はテンションレベラーおよび圧延機によってそれ
ぞれ鋼板に与えた伸び率と脱スケール時間短縮率との関
係の一例を示す線図、第２図は本発明を実施する設備の
一例を示す設備構成図、第３図は本発明の他の例を実施
する設備の構成図、第４図は最適の伸び率を求める手順
を示すフローチャート、第５図は伸び率を求める線図、
第６図は最適の伸び率を求める他の手順を示すフローチ
ャート、ならびに第７図〜第９図はそれぞれ従来法と本
発明とを比較して電力コストおよびロールコストを示す
線図である。 ■・・・ヘイオフリール、５・・・テンションレベラー
、ＩＯ・・・ブラシロール、１２・・・酸洗槽、１８．
４０・・・テンションリール、２１．２２・・・スケー
ル検出器、２３・・・制御コンピューター、２４・・・
コントローラー、２６・・・冷間圧延機列、３２・・・
連続焼鈍装置。Fig. 1 is a diagram showing an example of the relationship between the elongation rate given to a steel plate by a tension leveler and a rolling mill and the descaling time reduction rate, and Fig. 2 is an equipment configuration diagram showing an example of equipment for implementing the present invention. , FIG. 3 is a block diagram of equipment for implementing another example of the present invention, FIG. 4 is a flowchart showing the procedure for determining the optimal elongation rate, and FIG. 5 is a diagram for determining the elongation rate.
FIG. 6 is a flowchart showing another procedure for determining the optimum elongation rate, and FIGS. 7 to 9 are diagrams showing electric power cost and roll cost by comparing the conventional method and the present invention, respectively. ■... Hayo reel, 5... Tension leveler, IO... Brush roll, 12... Pickling tank, 18.
40... Tension reel, 21.22... Scale detector, 23... Control computer, 24...
Controller, 26...Cold rolling mill row, 32...
Continuous annealing equipment.

Claims (1)

【特許請求の範囲】 （１）熱延鋼板を送りながらこれに伸びを与えて熱延鋼
板表面のスケールを破砕し、ついで破砕スケールを熱延
鋼板表面から除去する方法において、熱延鋼板の製造条
件もしくは熱延鋼板表面スケールの性状および量、また
は熱延鋼板の製造条件ならびに熱延鋼板表面スケールの
性状および量に基づき伸び率を制御することを特徴とす
る熱延鋼板の脱スケール方法。 （２）テンションレベラーで伸び率７．０％以下の伸び
を熱延鋼板に与えることを特徴とする特許請求の範囲第
１項記載の熱延鋼板の脱スケール方法。 （３）圧延機で伸び率７．０％以下の伸びを熱延鋼板に
与えることを特徴とする特許請求の範囲第１項記載の熱
延鋼板の脱スケール方法。 （４）ブラシ研削、酸洗、湿式ブラスト、および乾式ブ
ラストのうちの少なくとも一つにより前記破砕スケール
を熱延鋼板表面から除去することを特徴とする特許請求
の範囲第１項記載の熱延鋼板の脱スケール方法。 （５）冷間圧延が脱スケールに続いて行なわれる連続工
程において、前記スケールの破砕と破砕スケールの除去
とを前記冷間圧延の直前に行なうことを特徴とする特許
請求の範囲第１項記載の熱延鋼板の脱スケール方法。 （８）冷間圧延および連続焼鈍が順次脱スケールに続い
て行なわれる連続工程において、前記スケールの破砕と
破砕スケールの除去とを前記冷間圧延の直前に行なうこ
とを特徴とする特許請求の範囲第１項記載の熱延鋼板の
脱スケール方法。[Scope of Claims] (1) A method for manufacturing a hot-rolled steel plate in which the scale on the surface of the hot-rolled steel plate is crushed by giving elongation to the hot-rolled steel plate while feeding, and then the crushed scale is removed from the surface of the hot-rolled steel plate. A method for descaling a hot-rolled steel sheet, the method comprising controlling the elongation rate based on the conditions or the properties and amount of the hot-rolled steel sheet surface scale, or the hot-rolled steel sheet manufacturing conditions and the properties and amount of the hot-rolled steel sheet surface scale. (2) The method for descaling a hot-rolled steel sheet according to claim 1, which comprises applying an elongation of 7.0% or less to the hot-rolled steel sheet using a tension leveler. (3) A method for descaling a hot-rolled steel sheet according to claim 1, characterized in that the hot-rolled steel sheet is given an elongation of 7.0% or less in a rolling mill. (4) The hot-rolled steel sheet according to claim 1, wherein the crushed scale is removed from the surface of the hot-rolled steel sheet by at least one of brush grinding, pickling, wet blasting, and dry blasting. Descaling method. (5) In a continuous process in which cold rolling is performed subsequent to descaling, crushing of the scale and removal of the crushed scale are performed immediately before the cold rolling. method for descaling hot-rolled steel sheets. (8) In a continuous process in which cold rolling and continuous annealing are sequentially performed after descaling, crushing of the scale and removal of the crushed scale are performed immediately before the cold rolling. 2. The method for descaling a hot rolled steel sheet according to item 1.
JP60261294A 1985-03-15 1985-11-22 Descaling method for hot rolled steel plate Pending JPS62124017A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP60261294A JPS62124017A (en) 1985-11-22 1985-11-22 Descaling method for hot rolled steel plate
KR1019860001735A KR900007072B1 (en) 1985-03-15 1986-03-11 Method and apparatus for manufacturing coldrolled steel strip
CA000504111A CA1268932A (en) 1985-03-15 1986-03-14 Method and apparatus for manufacturing cold-rolled steel strip
ES553020A ES8703756A1 (en) 1985-03-15 1986-03-14 Method and apparatus for manufacturing cold-rolled steel strip.
EP86103479A EP0195385B1 (en) 1985-03-15 1986-03-14 Method and apparatus for manufacturing cold-rolled steel strip
AT86103479T ATE65721T1 (en) 1985-03-15 1986-03-14 METHOD AND DEVICE FOR PRODUCTION OF COLD ROLLED STEEL STRIP.
BR8601145A BR8601145A (en) 1985-03-15 1986-03-14 APPARATUS FOR THE MANUFACTURE OF COLD-LAMINATED STEEL STRIPS AS WELL AS A PROCESS FOR THE PRODUCTION OF COLD-LAMINATED STRIPS-REMOVE THE CARE FORMED ON THE SURFACE OF HOT-LAMINATED STRIPS
DE8686103479T DE3680560D1 (en) 1985-03-15 1986-03-14 METHOD AND DEVICE FOR PRODUCING COLD ROLLED STEEL STRIP.
US07/143,311 US4872245A (en) 1985-03-15 1988-01-11 Method and apparatus for manufacturing cold-rolled steel strip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60261294A JPS62124017A (en) 1985-11-22 1985-11-22 Descaling method for hot rolled steel plate

Publications (1)

Publication Number Publication Date
JPS62124017A true JPS62124017A (en) 1987-06-05

Family

ID=17359799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60261294A Pending JPS62124017A (en) 1985-03-15 1985-11-22 Descaling method for hot rolled steel plate

Country Status (1)

Country Link
JP (1) JPS62124017A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169581A (en) * 1984-02-13 1985-09-03 Nippon Steel Corp Method for discriminating remaining scale condition of copper strip
JPS60169580A (en) * 1984-02-10 1985-09-03 Nippon Steel Corp Method for discriminating remaining scale condition of copper strip

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169580A (en) * 1984-02-10 1985-09-03 Nippon Steel Corp Method for discriminating remaining scale condition of copper strip
JPS60169581A (en) * 1984-02-13 1985-09-03 Nippon Steel Corp Method for discriminating remaining scale condition of copper strip

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