JPH10128424A - Hot rolling method of steel plate and its equipment - Google Patents
Hot rolling method of steel plate and its equipmentInfo
- Publication number
- JPH10128424A JPH10128424A JP8290010A JP29001096A JPH10128424A JP H10128424 A JPH10128424 A JP H10128424A JP 8290010 A JP8290010 A JP 8290010A JP 29001096 A JP29001096 A JP 29001096A JP H10128424 A JPH10128424 A JP H10128424A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- rolled
- steel sheet
- induction heating
- hot
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、広くは金属板の熱
間圧延方法及びその設備に関し、特に鉄鋼の熱延におけ
る熱間圧延方法及びその設備に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a hot rolling method for metal sheets and its equipment, and more particularly to a hot rolling method and equipment for hot rolling steel.
【０００２】[0002]
【従来の技術】鉄鋼の熱延に代表されるような板の熱間
圧延においては、被圧延材は必要最小限の加熱温度で圧
延することが望まれている。即ち、一般的に、高温であ
るほど単位時間に失われるエネルギーが大きく、急速に
温度が低下する。従って、熱エネルギーの有効利用の観
点から、熱間の圧延は品質が確保できる限り温度を低く
して圧延を施すことが望ましい。2. Description of the Related Art In hot rolling of a sheet typified by hot rolling of steel, it is desired that a material to be rolled be rolled at a minimum necessary heating temperature. That is, generally, the higher the temperature is, the more energy is lost per unit time, and the temperature decreases rapidly. Therefore, from the viewpoint of effective use of heat energy, it is desirable that hot rolling be performed at a low temperature as long as quality can be ensured.
【０００３】従って、圧延工程の中途での被圧延材の温
度低下は問題であり、従来は、粗圧延と仕上げの圧延に
大別される圧延の工程において、仕上げ圧延後の板の温
度を一定値以上にする必要があること、あるいは変形抵
抗が増加し仕上げ圧延機の能力的な制約を逸脱すること
がないようにする必要がある、そのため仕上げ圧延機の
前で一定の温度を下回ることがないようにすることなど
の理由により、粗圧延での温度降下を見込んで初期温度
を設定していた。[0003] Therefore, there is a problem that the temperature of the material to be rolled in the middle of the rolling process is a problem. Conventionally, in the rolling process roughly divided into rough rolling and finish rolling, the temperature of the sheet after finish rolling is kept constant. Value, or the deformation resistance must be increased so that it does not deviate from the capacity limitations of the finishing mill, so that a certain temperature can be lowered before the finishing mill. The initial temperature has been set in consideration of the temperature drop in the rough rolling for reasons such as avoiding it.
【０００４】特開昭59-92114号公報及び特開昭62-21804
号公報では、特に冷えやすい板端部をトランスバース式
誘導加熱により再加熱する方法が採用されている。この
技術は特開昭63-126608 号公報のように厚板製造におい
ても利用されている。JP-A-59-92114 and JP-A-62-21804
In the publication, a method of reheating a particularly cold end of the plate by transverse induction heating is adopted. This technique is also used in the production of thick plates as disclosed in Japanese Patent Application Laid-Open No. 63-126608.
【０００５】また、特開平6-15306 号公報では、上記の
従来技術のようにある程度圧延した後で加熱するのでは
なく、軽い整形圧延の後、スラブの段階で端部を再加熱
する技術も開示されている。In Japanese Patent Application Laid-Open No. 6-15306, there is also disclosed a technique in which the end portion is reheated at the slab stage after light shaping and rolling, instead of heating after rolling to some extent as in the above-mentioned prior art. It has been disclosed.
【０００６】一方、板の先端と後端も温度低下しやすい
部位であり、上記特開昭59-92114号公報、特開昭62-218
04号公報及び特開昭63-126608 号公報で使われているエ
ッジヒータ設備を、先端と後端が通過する際に、幅方向
に移動させ先後端を幅方向全域に渡って加熱する特開平
1-321009号公報、特開平4-33715 号公報に記載の方法も
ある。On the other hand, the leading end and the trailing end of the plate are also sites where the temperature is liable to decrease, as described in the above-mentioned JP-A-59-92114 and JP-A-62-218.
Japanese Patent Application Laid-Open No. H10-204605 heats the edge heater equipment used in Japanese Patent Application Laid-Open No. 04-126608 and Japanese Patent Application Laid-Open No. 63-126608 in the width direction and heats the front and rear ends over the entire width direction when the front and rear ends pass.
There are also methods described in 1-321009 and JP-A-4-33715.
【０００７】また、長手方向の一時的な温度低下に対し
ては、特開昭56-71501号公報に開示されているように、
仕上げ圧延機の前に誘導加熱装置を設け、スキッドマー
クのように長手方向に温度が低下している部分を幅方向
全体にわたって再加熱する方法もとられていた。[0007] As to the temporary temperature decrease in the longitudinal direction, as disclosed in JP-A-56-71501,
A method has been proposed in which an induction heating device is provided in front of the finishing mill, and a portion whose temperature is reduced in the longitudinal direction, such as a skid mark, is reheated over the entire width direction.
【０００８】あるいは、特開昭61-245911 号公報のよう
に通電加熱による方法もあり、このように幅方向全体に
対する加熱の方法としては、特開昭51-122649 号公報に
示されているように鋼板に対しトランスバース式誘導加
熱装置を次処理の予熱のため、その処理装置に可能な限
り接近して設置する方法があった。[0008] Alternatively, there is a method using electric heating as disclosed in Japanese Patent Application Laid-Open No. 61-245911. A method for heating the entire width direction is disclosed in Japanese Patent Application Laid-Open No. 51-122649. There was a method in which a transverse induction heating device was installed on a steel sheet as close as possible to the treatment device for preheating in the next process.
【０００９】[0009]
【発明が解決しようとする課題】しかし、圧延前の初期
温度を低く設定するために、温度降下が大きい板端部ま
たは板の先後端の温度を補償するような上記の特開昭59
-92114号公報、特開昭62-21804号公報、特開昭63-12660
8 号公報、特開平1-321009号公報及び特開平4-33715 号
公報の方法は、初期温度をある程度下げることはできる
ものの、根本的な解決になっていない。However, in order to set the initial temperature before rolling low, the above-mentioned Japanese Patent Application Laid-Open No. SHO 59-5959 discloses a method for compensating for the temperature at the end of the plate or the front and rear ends of the plate where the temperature drop is large.
-92114, JP-A-62-21804, JP-A-63-12660
No. 8, JP-A-1-321100 and JP-A-4-33715 can reduce the initial temperature to some extent, but have not been a fundamental solution.
【００１０】そこで、中間に加熱装置を設置し、初期温
度を積極的に下げ、圧延初期で失われる熱エネルギーの
量を少なくし、適当な場所で再加熱して圧延する方法が
考えられる。これを実現する方法として、従来例の特開
昭56-71501号公報のように通電加熱装置があるが、装置
や、電極などに多大なコストがかかり、問題である。In view of this, a method is conceivable in which a heating device is installed in the middle, the initial temperature is positively lowered, the amount of heat energy lost at the beginning of rolling is reduced, and reheating is performed at an appropriate place for rolling. As a method for realizing this, there is an electric heating device as disclosed in Japanese Patent Application Laid-Open No. Sho 56-71501, but this is problematic because a large amount of cost is required for the device and electrodes.
【００１１】実現が容易な中間加熱の方法としては、誘
導加熱があるが、従来例の特開昭51-122649 号公報のよ
うに、トランスバース式の誘導加熱では、コイルのギャ
ップ調整機構が必要であり設備が複雑になること、また
板の端部が過加熱になるなどの問題がある。As an intermediate heating method that can be easily realized, there is induction heating. However, as disclosed in Japanese Patent Laid-Open Publication No. Sho 51-122649, a transverse induction heating requires a coil gap adjusting mechanism. However, there are problems that the equipment becomes complicated and that the end of the plate is overheated.
【００１２】また、特開昭51-122649 号公報の例のよう
に再加熱装置の位置は可能な限り次工程に接近して設置
するのが通例であったが、このような設備配置では、次
工程がデスケーリングや圧延など板表面からの冷却が発
生する場合は、板の表面温度が高い状態にあるため、誘
導加熱で与えた熱エネルギーが奪われやすいという問題
がある。In addition, as in the example of Japanese Patent Application Laid-Open No. 51-122649, the position of the reheating device is usually set as close to the next process as possible. In the case where cooling from the plate surface occurs in the next step such as descaling or rolling, the surface temperature of the plate is in a high state, so that there is a problem that heat energy given by induction heating is easily taken away.
【００１３】本発明の目的は、上記のような問題点を解
決するためになされたもので、圧延前の初期温度を低く
設定し、圧延の中途に再加熱装置を設け、被圧延材の品
質を損なうことなく、全体として圧延に必要な熱エネル
ギーを低減することが可能な鋼板の熱間圧延方法及びそ
の設備を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. The initial temperature before rolling is set low, a reheating device is provided in the middle of rolling, and the quality of the material to be rolled is reduced. It is an object of the present invention to provide a hot rolling method and a facility for a steel sheet, which can reduce the heat energy required for rolling as a whole without impairing the steel sheet.
【００１４】[0014]
【課題を解決するための手段】前記課題を解決し目的を
達成するために、本発明は以下に示す手段を用いてい
る。 （１）本発明の圧延方法は、加熱した被圧延材を粗圧延
機で粗圧延する工程と、粗圧延した被圧延材を仕上げ圧
延機で仕上げ圧延する工程とを備え、少なくとも仕上げ
圧延工程の前に被圧延材をソレノイド式の誘導加熱装置
で再加熱する工程を備えたことを特徴とする鋼板の熱間
圧延方法である。 （２）本発明の圧延方法は、ソレノイド式の誘導加熱装
置が、仕上げ圧延工程前の被圧延材の表面温度が板厚中
央の温度より低くなるように設置されることを特徴とす
る上記（１）に記載の鋼板の熱間圧延方法である。 （３）本発明の圧延方法は、ソレノイド式の誘導加熱装
置を移動して、その加熱位置を調節することを特徴とす
る上記（２）に記載の鋼板の熱間圧延方法である。
（４）本発明の圧延方法は、ソレノイド式の誘導加熱装
置を複数台設置し、使用する加熱装置を選択することに
より加熱位置を調節することを特徴とする上記（２）に
記載の鋼板の熱間圧延方法である。 （５）本発明の圧延方法は、板厚方向の熱拡散時間を、
下記（１）式に従って設定することを特徴とする上記
（２）乃至（４）のいずれかに記載の鋼板の熱間圧延方
法である。In order to solve the above problems and achieve the object, the present invention uses the following means. (1) The rolling method of the present invention includes a step of roughly rolling a heated material to be rolled by a rough rolling machine and a step of finish rolling the roughly rolled material to be rolled by a finish rolling machine. A hot rolling method for a steel sheet, comprising a step of reheating a material to be rolled by a solenoid-type induction heating device before. (2) The rolling method of the present invention is characterized in that the solenoid-type induction heating device is installed so that the surface temperature of the material to be rolled before the finish rolling step is lower than the temperature at the center of the plate thickness. A method for hot rolling a steel sheet according to 1). (3) The rolling method of the present invention is the hot rolling method for a steel sheet according to (2), wherein the induction heating device of a solenoid type is moved to adjust a heating position.
(4) The rolling method according to the present invention is characterized in that a plurality of solenoid-type induction heating devices are installed, and a heating position is adjusted by selecting a heating device to be used. This is a hot rolling method. (5) In the rolling method of the present invention, the heat diffusion time in the thickness direction is
The hot rolling method for a steel sheet according to any one of the above (2) to (4), wherein the method is set according to the following equation (1).
【００１５】Ｔ：熱拡散時間、α：設備列に固有の係
数、ρ：板の密度、Ｃp ：板の比熱、λ：板の熱伝導
率、Ｈ：板の厚さとするとき、 Ｔ＝α×（ρＣp ／λ）×Ｈ2 …（１） （６）本発明の圧延方法は、被圧延材の再加熱工程が、
粗圧延工程と仕上げ圧延工程との間にさらにエッジヒー
タを配置し、被圧延材の板幅方向端部を加熱することを
特徴とする上記（１）乃至（５）のいずれかに記載の鋼
板の熱間圧延方法である。 （７）本発明の圧延方法は、被圧延材の再加熱工程が、
被圧延材を矯正した後に、再加熱することを特徴とする
上記（１）乃至（６）のいずれかに記載の鋼板の熱間圧
延方法である。 （８）本発明の圧延方法は、ソレノイド式の誘導加熱装
置を、仕上げ圧延機の入側に設置し、その励起周波数を
１０００〜３０００Ｈｚに設定することを特徴とする上
記（１）乃至（７）のいずれかに記載の鋼板の熱間圧延
方法である。 （９）本発明の圧延設備は、加熱した被圧延材を粗圧延
する粗圧延機と、粗圧延した被圧延材を仕上げ圧延する
仕上げ圧延機とを備えた鋼板の熱間圧延設備において、
少なくとも仕上げ圧延機の前に被圧延材を再加熱するソ
レノイド式の誘導加熱装置を備えてなることを特徴とす
る鋼板の熱間圧延設備である。 （１０）本発明の圧延設備は、ソレノイド式の誘導加熱
装置が、仕上げ圧延機に至る前の被圧延材の表面温度が
板厚中央の温度より低くなるように設置されていること
を特徴とする上記（９）に記載の鋼板の熱間圧延設備で
ある。 （１１）本発明の圧延設備は、ソレノイド式の誘導加熱
装置が、移動されて、その加熱位置を調節されることを
特徴とする上記（１０）に記載の鋼板の熱間圧延設備で
ある。 （１２）本発明の圧延設備は、ソレノイド式の誘導加熱
装置が、複数台設置され、使用する加熱装置を選択する
ことにより加熱位置を調節されることを特徴とする上記
（１０）に記載の鋼板の熱間圧延設備である。 （１３）本発明の圧延設備は、板厚方向の熱拡散時間
が、下記（１）式に従って設定されることを特徴とする
上記（１０）乃至（１２）のいずれかに記載の鋼板の熱
間圧延設備である。T: thermal diffusion time, α: coefficient specific to equipment row, ρ: density of plate, C p : specific heat of plate, λ: thermal conductivity of plate, H: thickness of plate, T = α × (ρC p / λ) × H 2 (1) (6) In the rolling method of the present invention, the step of reheating the material to be rolled is
The steel sheet according to any one of the above (1) to (5), wherein an edge heater is further arranged between the rough rolling step and the finish rolling step to heat an end of the material to be rolled in the sheet width direction. Hot rolling method. (7) In the rolling method of the present invention, the step of reheating the material to be rolled includes:
The hot rolling method for a steel sheet according to any one of the above (1) to (6), wherein the material to be rolled is reheated after being corrected. (8) The rolling method of the present invention is characterized in that a solenoid-type induction heating device is installed on the entrance side of a finishing mill and its excitation frequency is set at 1000 to 3000 Hz. ). (9) The rolling equipment of the present invention is a hot rolling equipment for a steel sheet, comprising: a rough rolling mill for roughly rolling a material to be heated; and a finishing rolling machine for finish rolling the material to be roughly rolled,
A hot rolling facility for a steel sheet, comprising a solenoid-type induction heating device for reheating a material to be rolled at least before a finish rolling mill. (10) The rolling equipment of the present invention is characterized in that the solenoid-type induction heating device is installed such that the surface temperature of the material to be rolled before reaching the finishing mill is lower than the temperature at the center of the plate thickness. The hot rolling equipment for a steel sheet according to the above (9). (11) The rolling equipment of the present invention is the hot-rolling equipment for a steel sheet according to (10), wherein the induction heating device of a solenoid type is moved to adjust a heating position. (12) In the rolling equipment of the present invention, a plurality of solenoid induction heating devices are installed, and a heating position is adjusted by selecting a heating device to be used, wherein the heating position is adjusted. This is a hot rolling facility for steel sheets. (13) The rolling equipment of the present invention is characterized in that the heat diffusion time in the thickness direction is set according to the following equation (1), wherein the heat diffusion time of the steel sheet according to any of (10) to (12) above is set. Cold rolling equipment.
【００１６】Ｔ：熱拡散時間、α：設備列に固有の係
数、ρ：板の密度、Ｃp ：板の比熱、λ：板の熱伝導
率、Ｈ：板の厚さとするとき、 Ｔ＝α×（ρＣp ／λ）×Ｈ2 …（１） （１４）本発明の圧延設備は、粗圧延機と仕上げ圧延機
の間に被圧延材の板幅方向端部を加熱するエッジヒータ
が、さらに設置されていることを特徴とする上記（９）
乃至（１３）のいずれかに記載の鋼板の熱間圧延設備で
ある。 （１５）本発明の圧延設備は、ソレノイド式の誘導加熱
装置の入側に被圧延材の形状矯正装置が、設置されてい
ることを特徴とする上記（９）乃至（１４）のいずれか
に記載の鋼板の熱間圧延設備である。 （１６）本発明の圧延設備は、ソレノイド式の誘導加熱
装置が、仕上げ圧延機の入側に設置され、その励起周波
数を１０００〜３０００Ｈｚに設定されていることを特
徴とする上記（９）乃至（１５）のいずれかに記載の鋼
板の熱間圧延設備である。T: thermal diffusion time, α: coefficient specific to equipment row, ρ: density of plate, C p : specific heat of plate, λ: thermal conductivity of plate, H: thickness of plate, T = α × (ρC p / λ) × H 2 (1) (14) In the rolling equipment of the present invention, an edge heater for heating an end portion in a sheet width direction of a material to be rolled is provided between a rough rolling mill and a finishing rolling mill. (9), which is further installed.
A hot rolling equipment for steel sheets according to any one of (1) to (13). (15) The rolling equipment according to any one of (9) to (14), wherein a shape correcting device for a material to be rolled is provided on an inlet side of a solenoid-type induction heating device. It is a hot rolling facility for the described steel sheet. (16) The rolling equipment of the present invention is characterized in that a solenoid-type induction heating device is installed on the entrance side of the finishing mill, and its excitation frequency is set to 1000 to 3000 Hz. (15) The hot-rolling equipment for a steel sheet according to any one of (15).
【００１７】[0017]
【発明の実施の形態】本発明者は、圧延前の初期温度を
低く設定し、圧延の中途に再加熱装置を設け、被圧延材
の品質を損なうことなく、全体として圧延に必要な熱エ
ネルギーを低減することが可能な鋼板の熱間圧延方法及
びその設備について、鋭意研究を重ねた。 その結果、
被圧延材の品質を損なうことなく、全体として圧延に必
要な熱エネルギーを低減するためには、圧延の中途に設
ける再加熱装置としてソレノイド式の誘導加熱装置を採
用し、被圧延材に投入した熱が次工程で表面から失われ
にくいように板厚方向に十分に拡散し、被圧延材の表面
温度が板厚中央の温度より低くなるような板厚方向の熱
拡散時間を設定、管理できるように加熱装置を配置、運
用することが有効であるという知見を得た。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors set the initial temperature before rolling low, provided a reheating device in the middle of rolling, and did not impair the quality of the material to be rolled. The intense research was conducted on the hot rolling method and the equipment of the steel sheet which can reduce the temperature. as a result,
In order to reduce the heat energy required for rolling as a whole without deteriorating the quality of the material to be rolled, a solenoid-type induction heating device was adopted as a reheating device provided in the middle of rolling, and was introduced into the material to be rolled. The heat diffusion time in the thickness direction can be set and controlled so that heat is diffused sufficiently in the thickness direction so that heat is not easily lost from the surface in the next process, and the surface temperature of the material to be rolled is lower than the temperature at the center of the thickness. It has been found that it is effective to arrange and operate the heating device as described above.
【００１８】また、上記の熱拡散時間は、被圧延材の材
質や板厚に応じた関係式に従って設定できることや、圧
延機列中にエッジヒータを設け板幅方向端部を加熱する
ことで端部の温度低下を補償して、より均一な材質が得
られること、さらに、ソレノイド式の誘導加熱装置の前
に形状矯正装置を設けることで、加熱に伴う表面温度の
過度の上昇による欠陥を防止できることや、加熱装置を
熱延の仕上げ圧延機の前に設置することに限定すれば、
特定の板厚に対して加熱装置の励起周波数を一定範囲に
設定することで、高い加熱効率が得られるという知見を
得た。The above-mentioned heat diffusion time can be set according to a relational expression according to the material and the thickness of the material to be rolled, or by providing an edge heater in the rolling mill row and heating the end in the width direction of the plate. Compensation of the temperature drop in the section to obtain a more uniform material, and by installing a shape correction device before the solenoid-type induction heating device, prevents defects due to excessive rise in surface temperature due to heating If it can be limited to installing the heating device in front of the hot rolling finishing mill,
It has been found that a high heating efficiency can be obtained by setting the excitation frequency of the heating device to a certain range for a specific plate thickness.
【００１９】以上の知見に基づき、本発明者は、圧延の
中途に設ける再加熱装置としてソレノイド式の誘導加熱
装置を採用し、被圧延材に投入した熱が次工程で表面か
ら失われにくいように板厚方向に十分に拡散し、被圧延
材の表面温度が板厚中央の温度より低くなるような板厚
方向の熱拡散時間を被圧延材の材質や板厚に応じて設定
し、その時間に基づいて加熱装置を配置、運用するよう
にした。また、上記の圧延機列中にエッジヒータを設け
板幅方向端部を加熱し、さらに、ソレノイド式の誘導加
熱装置の前に形状矯正装置を設け、加熱装置を熱延の仕
上げ圧延機の前に設置する場合は、特定の板厚に対して
加熱装置の励起周波数を一定範囲に設定するようにし
て、被圧延材の品質を損なうことなく、全体として圧延
に必要な熱エネルギーを低減することが可能な鋼板の熱
間圧延方法及びその設備を見出だし、本発明を完成し
た。すなわち、本発明は、製造設備及び製造条件を下記
範囲に限定することにより、被圧延材の品質を損なうこ
となく、全体として圧延に必要な熱エネルギーを低減す
ることが可能な鋼板の熱間圧延方法及びその設備を得る
ことができる。Based on the above findings, the present inventor has adopted a solenoid-type induction heating device as a reheating device provided in the middle of rolling so that the heat input to the material to be rolled is less likely to be lost from the surface in the next step. The heat diffusion time in the thickness direction such that the surface temperature of the material to be rolled is sufficiently diffused in the thickness direction and the surface temperature of the material to be rolled is lower than the temperature at the center of the thickness is set according to the material and the thickness of the material to be rolled. The heating device was arranged and operated based on time. Also, an edge heater is provided in the above rolling mill row to heat the end in the sheet width direction, and further, a shape straightening device is provided in front of a solenoid-type induction heating device, and the heating device is provided in front of a hot rolling finish rolling mill. When installing at a specific thickness, the excitation frequency of the heating device should be set within a certain range for a specific plate thickness to reduce the heat energy required for rolling as a whole without impairing the quality of the material to be rolled. The present inventors have found a method and equipment for hot rolling a steel sheet capable of performing the present invention, and have completed the present invention. That is, the present invention, by limiting the production equipment and the production conditions to the following range, without impairing the quality of the material to be rolled, hot rolling of a steel sheet capable of reducing the heat energy required for rolling as a whole A method and its equipment can be obtained.
【００２０】以下に本発明の製造設備の限定理由、及び
製造条件の限定理由について説明する。 （１）鋼板の熱間圧延方法及びその設備 本発明の熱間圧延方法を図１に従って説明する。一般の
鋼板の熱間圧延においては、スラブや鋼塊１は凝固後そ
のまま、あるいは再加熱することによって、高温の状態
に保たれ粗圧延機２により粗圧延され、鋼板３のように
中間の厚さまで圧延される。Hereinafter, the reasons for limiting the manufacturing equipment and the manufacturing conditions of the present invention will be described. (1) Hot rolling method of steel sheet and its equipment The hot rolling method of the present invention will be described with reference to FIG. In the hot rolling of a general steel sheet, a slab or a steel ingot 1 is kept in a high temperature state by solidification or by reheating after solidification, and is roughly rolled by a rough rolling mill 2, and has an intermediate thickness like a steel sheet 3. Rolled to the end.
【００２１】その後、鋼板３は搬送ローラ７を介して搬
送され、デスケーリング装置５などにより表面のスケー
ル除去などを行った後、仕上げ圧延機６により最終的な
板厚まで仕上げ圧延する。この後、図示しない冷却設備
などにより、適正な冷却等や、コイルへの巻き取りなど
が行われる。Thereafter, the steel sheet 3 is conveyed through a conveying roller 7, and after the scale is removed from the surface by a descaling device 5 or the like, the steel sheet 3 is finish-rolled to a final thickness by a finish rolling machine 6. Thereafter, appropriate cooling or the like, winding around a coil, or the like is performed by a cooling facility (not shown) or the like.
【００２２】本発明は、このような設備列において、粗
圧延機と仕上げ圧延機の間に再加熱装置として、ソレノ
イド式の誘導加熱装置４を設け、その設置位置を加熱が
終了した時点から、デスケーリングあるいは、次の圧延
に至るまでに要する時間的距離８（熱拡散時間）を一定
時間以上とし、表皮効果によって表層のみが高温になっ
ている板内部に熱エネルギーが十分に拡散し、表面の温
度が板厚中央の温度より低くなるようにとる。According to the present invention, in such a line of equipment, a solenoid-type induction heating device 4 is provided as a reheating device between a rough rolling mill and a finishing rolling mill, and the installation position is changed from the time when heating is completed. The time distance 8 (thermal diffusion time) required for descaling or the next rolling is set to a certain time or more, and the thermal energy is sufficiently diffused into the inside of the plate where only the surface layer is at a high temperature due to the skin effect. Is lower than the temperature at the center of the sheet thickness.
【００２３】これは、一定の熱エネルギーを与えること
で、物質をある温度以下にならないようにする場合、最
初に一括して熱エネルギーを与えた場合に較べ、エネル
ギーを二分して時間をおいて与える方が、最高温度が低
いために熱の放散が少なく、より長時間にわたり高温の
状態を維持できることを利用したものである。この原理
を鋼板の熱延に適用するために、再加熱方法を機構の簡
便性、設置の容易性及び加熱効率の優位性などが必要で
あることから、ソレノイド式の誘導加熱装置とする。This is because when applying a constant heat energy to keep a substance from lowering to a certain temperature or lower, compared with the case where heat energy is applied collectively at first, the energy is divided into two and a time is allowed. Giving is based on the fact that the maximum temperature is low, so that heat dissipation is small and the high temperature state can be maintained for a longer time. In order to apply this principle to hot rolling of a steel sheet, the reheating method needs a simple mechanism, easy installation, and superior heating efficiency.
【００２４】すなわち、熱延の設備列では、加熱できる
時間（位置）の制約からパワー（電力）の大きな電気的
な加熱方法が好ましく、スパークによる鋼板表面への影
響の面で通電式は使えないため、誘導加熱に限定され
る。誘導加熱にはソレノイド式とトランスバース式があ
るが、トランスバース式は加熱領域に能力的な分布があ
り一様性に欠け、コイルとバー（鋼板）との位置関係を
最良な関係に維持する必要がある。従って、本発明の誘
導加熱装置をソレノイド式にした理由は、板厚数十ｍｍ
程度の粗バー加熱では、トランスバース式に比べ投入さ
れるパワー（電力）が板幅方向にほぼ一様であり偏熱の
問題が少ないこと、構造が簡便であり、加熱装置中をバ
ーが通過すれば加熱ができるという単純さから採用し
た。In other words, in the hot rolling equipment line, an electric heating method having a large power is preferable from the viewpoint of the heating time (position), and the energization method cannot be used in view of the influence of the spark on the steel sheet surface. Therefore, it is limited to induction heating. There are two types of induction heating: a solenoid type and a transverse type. The transverse type has a distribution of heat in the heating area and lacks uniformity, and maintains the best positional relationship between the coil and the bar (steel plate). There is a need. Therefore, the reason why the induction heating device of the present invention is a solenoid type is that the plate thickness is several tens mm.
In the case of coarse bar heating, the power (electric power) applied is almost uniform in the width direction of the plate compared to the transverse type, and there is little problem of uneven heating. The structure is simple, and the bar passes through the heating device. It was adopted because of its simplicity of heating.
【００２５】また、加熱後の熱拡散時間を一定時間以上
とする理由は、ソレノイド式加熱の場合、表面が不可避
的に高温になることから、投入した熱が次工程で表面か
ら失われにくいように板厚方向に熱が十分に拡散し、板
厚方向の温度分布が適切になるようにするためであり、
本発明では、再加熱から次工程までの時間を設定、管理
できるように加熱装置を配置、運用する。The reason for setting the heat diffusion time after heating to a certain time or more is that, in the case of solenoid heating, the surface is inevitably high in temperature, so that the input heat is unlikely to be lost from the surface in the next step. In order to ensure that the heat is sufficiently diffused in the thickness direction and the temperature distribution in the thickness direction is appropriate,
In the present invention, a heating device is arranged and operated so that the time from reheating to the next step can be set and managed.
【００２６】この熱拡散時間の設定基準は、ソレノイド
式誘導加熱装置で投入した熱エネルギーを一定にしたと
きに、その熱エネルギーが仕上げ圧延後に十分に残存し
ているようにとる。The standard for setting the heat diffusion time is such that when the heat energy supplied by the solenoid-type induction heating device is fixed, the heat energy sufficiently remains after the finish rolling.
【００２７】これは、鋼板の表面と鋼板中心の温度差が
少なくとも負の値、望ましくは、−１０℃以下になるよ
うな値にすれば良い。また、仕上げ圧延の速度が変化す
る場合は、再加熱装置の位置を可変にする方法や、複数
の再加熱装置を配置して、使用する加熱装置を切り替え
て加熱位置を変更し、熱の拡散する時間を変える方法を
とっても良い。This may be set so that the temperature difference between the surface of the steel sheet and the center of the steel sheet is at least a negative value, preferably -10 ° C. or less. Also, when the speed of the finish rolling changes, a method of changing the position of the reheating device, or disposing a plurality of reheating devices, switching the heating device to be used, changing the heating position, and dispersing heat. You may take a method to change the time to do.
【００２８】ここで、再加熱装置の設置位置は粗圧延機
と仕上げ圧延機の間に限定されず、粗圧延機の中間にあ
っても良い。また、この熱拡散時間は鋼板の材質や誘導
加熱時の板厚によっても変化するが、材質と板厚に応じ
た時間の値を下記（１）式に従って求めれば良い。Here, the installation position of the reheating device is not limited to between the rough rolling mill and the finishing rolling mill, but may be located between the rough rolling mills. Further, the heat diffusion time varies depending on the material of the steel sheet and the thickness at the time of induction heating, and the value of the time according to the material and the thickness may be obtained according to the following equation (1).
【００２９】Ｔ：熱拡散時間、α：設備列に固有の係
数、ρ：板の密度、Ｃp ：板の比熱、λ：板の熱伝導
率、Ｈ：板の厚さとするとき、 Ｔ＝α×（ρＣp ／λ）×Ｈ2 …（１） 即ち、材質，板厚などの条件変動により変化する熱の拡
散時間を、上記（１）式なる関係により、誘導加熱装置
の位置により設定することで、高い加熱効率を維持でき
る。T: thermal diffusion time, α: coefficient specific to equipment row, ρ: density of plate, C p : specific heat of plate, λ: thermal conductivity of plate, H: thickness of plate, T = α × (ρC p / λ) × H 2 (1) That is, the diffusion time of heat that changes due to the change in conditions such as the material and the plate thickness is set by the position of the induction heating device according to the relationship of the above equation (1). By doing so, high heating efficiency can be maintained.
【００３０】これは、加熱終了後に放射冷却しながら板
内部へ熱が拡散する状況を、断熱条件の伝熱方程式と近
似して、以下のフーリエ級数解のなかで、減衰の時定数
が最も大きい減衰の時定数（ρＣp ／λ）（Ｈ／２π）
2 を利用したものである。This is because the situation in which heat diffuses inside the plate while radiating and cooling after the end of heating is approximated to a heat transfer equation under adiabatic conditions, and the time constant of attenuation is the largest among the following Fourier series solutions. Decay time constant (ρC p / λ) (H / 2π)
It is based on 2 .
【００３１】[0031]
【数１】 (Equation 1)
【００３２】ここに、この式での時定数は一般的な値で
あり、個々の設備に応じた定数αを決定することで、材
質、板厚の変動に応じた最適な熱拡散時間を決定でき
る。具体的には最適な熱拡散時間を１点決めれば、αが
決定できる。Here, the time constant in this equation is a general value, and by determining the constant α corresponding to each facility, the optimum heat diffusion time according to the variation of the material and the plate thickness is determined. it can. More specifically, if one optimal heat diffusion time is determined, α can be determined.
【００３３】また、本発明の設備列中に、エッジヒータ
９を設け板幅方向端部を加熱する。この理由は、端部の
温度低下を補償して、より均一な材質が得られるように
するためである。その配置は自由に設定でき、誘導加熱
装置の前でも良い。Further, an edge heater 9 is provided in the equipment row of the present invention to heat the end in the plate width direction. The reason for this is to compensate for the temperature drop at the end so that a more uniform material can be obtained. The arrangement can be freely set and may be in front of the induction heating device.
【００３４】さらに、ソレノイド式誘導加熱装置に板を
安定して通すための形状矯正装置１０を加熱装置の入側
に設け、これを望ましくは上記熱拡散時間内にソレノイ
ド式誘導加熱が始まるように配置する。この理由は、形
状矯正装置の工具等により低下した板の表面が復熱する
前に再加熱を開始することで、再加熱時の表面温度が必
要以上に上がることを防ぐためである。Further, a shape correcting device 10 for stably passing the plate through the solenoid-type induction heating device is provided on the inlet side of the heating device so that the solenoid-type induction heating is desirably started within the heat diffusion time. Deploy. The reason for this is to prevent the surface temperature during reheating from rising more than necessary by starting reheating before the surface of the plate lowered by the tool or the like of the shape correction device is reheated.
【００３５】即ち、ソレノイド式誘導加熱装置において
は、開口部のギャップ調整が不可能であるため、板の形
状が不良である場合、ソレノイド式誘導加熱装置の中を
通過させることができず加熱ができない。このため、ソ
レノイド式誘導加熱装置に先立って形状を矯正する必要
があるが、形状矯正を行うと不可避的に表面の温度が低
下する。ところが、ソレノイド式誘導加熱装置は表面の
温度上昇量が大きいため、形状矯正装置を誘導加熱が開
始される前、望ましくは前記熱拡散時間以内に設置する
ことで加熱に伴う表面温度の上昇量を低く抑えることが
でき、加熱中に放射で失われる熱エネルギーを極小にす
るとともに、表面温度が過度に上昇することによる欠陥
を防止することができる。That is, in the solenoid-type induction heating device, since it is impossible to adjust the gap of the opening, if the plate has a bad shape, it cannot be passed through the solenoid-type induction heating device and heating is not performed. Can not. For this reason, it is necessary to correct the shape prior to the solenoid-type induction heating device, but if the shape is corrected, the surface temperature inevitably decreases. However, since the solenoid type induction heating device has a large surface temperature rise, before the induction heating is started, the shape correction device is preferably installed within the heat diffusion time to reduce the surface temperature rise due to heating. It is possible to minimize the heat energy lost due to radiation during heating, and to prevent defects caused by an excessive rise in surface temperature.
【００３６】本発明によれば、板端部も加熱されるもの
の、その温度上昇量は中央部と同程度のため、エッジヒ
ータも併設することで端部の温度を完全に補償すること
が可能になる。According to the present invention, the edge of the plate is also heated, but the temperature rise is about the same as that of the central part. Therefore, the temperature at the end can be completely compensated for by providing an edge heater. become.
【００３７】さらに、ソレノイド式の誘導加熱装置を熱
延の仕上げ圧延機の前に設置する場合は、加熱装置の励
起周波数を１０００〜３０００Ｈｚに設定して加熱す
る。即ち、本発明での設備列において、誘導加熱装置を
鉄鋼用の熱延仕上げ圧延機の前に設置することに限定す
れば、板の厚さは１０〜５０ｍｍ程度に限定され、材質
も限定されるから、コイルの励起周波数を１０００〜３
０００Ｈｚに設定することで、加熱時の温度分布を本発
明の効果が十分に発揮できるものとすることができ、高
い加熱効率が得られる。Further, when a solenoid-type induction heating device is installed in front of a hot rolling finishing mill, the heating frequency of the heating device is set to 1000 to 3000 Hz for heating. That is, in the equipment row in the present invention, if the induction heating device is limited to being installed before the hot-rolling finishing mill for steel, the thickness of the plate is limited to about 10 to 50 mm, and the material is also limited. Therefore, the excitation frequency of the coil should be 1000-3
By setting to 000 Hz, the temperature distribution at the time of heating can be made to sufficiently exert the effects of the present invention, and high heating efficiency can be obtained.
【００３８】この理由は、ソレノイド式誘導加熱装置で
あるため特に鋼板の熱延の仕上げ圧延前の段階では、加
熱の効率が上記の板厚に依存し、周波数が３０００Ｈｚ
を越えると表面の温度が過度に上昇し、また、１０００
Ｈｚより低い周波数では誘導加熱の加熱効率が悪くなる
ためである。従って、周波数の下限は１０００Ｈｚであ
り、上限は３０００Ｈｚである。この周波数は、板厚に
応じて変化させても良いし、代表的な周波数を与えても
よい。The reason for this is that the heating efficiency depends on the above-mentioned thickness, especially at the stage before the finish rolling of the hot rolling of the steel sheet, and the frequency is 3000 Hz because of the solenoid type induction heating apparatus.
Exceeds 1000, the surface temperature rises excessively, and 1000
This is because if the frequency is lower than Hz, the heating efficiency of the induction heating deteriorates. Therefore, the lower limit of the frequency is 1000 Hz and the upper limit is 3000 Hz. This frequency may be changed according to the plate thickness, or a representative frequency may be given.
【００３９】このように、本発明の製造方法及びその設
備によれば、被圧延材の品質を損なうことなく、全体と
して圧延に必要な熱エネルギーを低減することが可能な
鋼板の熱間圧延方法及びその設備を提供することが可能
である。以下に本発明の実施例を挙げ、本発明の効果を
立証する。As described above, according to the production method and the equipment of the present invention, the hot rolling method for a steel sheet can reduce the heat energy required for rolling as a whole without impairing the quality of the material to be rolled. And its equipment can be provided. Hereinafter, examples of the present invention will be described to demonstrate the effects of the present invention.
【００４０】[0040]
【実施例】本発明を実験的な圧延機を用いて、板厚３０
ｍｍから２５ｍｍまで一回の仕上げ圧延を施した場合の
効果を以下に述べる。この仕上げ圧延機の手前３ｍには
デスケーリング装置がある。仕上げ圧延は６０ｍｐｍで
行った。ソレノイド式誘導加熱装置をデスケーリング装
置の前に設置し、その位置を変更することで熱拡散時間
を変化させた。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to an experimental rolling mill with a thickness of 30 mm.
The effect of performing a single finish rolling from 25 mm to 25 mm will be described below. There is a descaling device 3 m before this finishing mill. Finish rolling was performed at 60 mpm. A solenoid induction heating device was installed in front of the descaling device, and its position was changed to change the heat diffusion time.
【００４１】この例では、デスケーリング装置の直近で
ある１ｍ前に誘導加熱装置を設置した場合が従来の考え
方であり、加熱終了からデスケーリングまでに１秒が経
過する（従来例）。投入するエネルギーを一定にして、
誘導加熱装置の位置をデスケーリング装置に至るまでに
４秒及び９秒が経過する位置に離して移動した場合が本
発明例である。In this example, the conventional idea is that the induction heating device is installed 1 m immediately before the descaling device, and one second elapses from the end of heating to the descaling (conventional example). With constant energy input,
An example of the present invention is a case where the position of the induction heating device is moved to a position where 4 seconds and 9 seconds elapse before reaching the descaling device.
【００４２】図２に示すようにこの熱拡散時間が短い従
来例では、デスケーリング装置の直前での表面温度が高
い。本発明のように４秒以上の熱拡散時間を設定した場
合は、デスケーリング直前での表面温度は低いものの、
仕上げ圧延が終わった時点では、従来例に比較して表面
温度はむしろ高く、デスケーリング及び仕上げ圧延で失
われる熱エネルギーが少ないことがわかる。As shown in FIG. 2, in the conventional example in which the heat diffusion time is short, the surface temperature immediately before the descaling device is high. When a heat diffusion time of 4 seconds or more is set as in the present invention, although the surface temperature immediately before descaling is low,
When the finish rolling is completed, the surface temperature is rather high as compared with the conventional example, and it can be seen that the heat energy lost in the descaling and the finish rolling is small.
【００４３】本発明の成立条件をより詳細に調べるた
め、図２に示した熱拡散時間による表面温度と板厚中央
の温度の差を測定した結果、図３のように、表面温度が
板厚中央を下回れば、仕上げ圧延後の温度を従来例より
も高くできることが分かった。In order to investigate the conditions for realizing the present invention in more detail, the difference between the surface temperature due to the heat diffusion time and the temperature at the center of the sheet thickness as shown in FIG. 2 was measured. It was found that the temperature after the finish rolling could be higher than that of the conventional example if the temperature was lower than the center.
【００４４】また、表１に示すように、鋼板の材質と板
厚を変えて圧延を行い、熱拡散時間の適正値（鋼板表面
と中心の温度差が−１０℃となるより望ましい条件を満
たす）を求め、α（設備列に固有の係数）を求めたとこ
ろ、この値が一定であることが分かった。Further, as shown in Table 1, rolling was carried out while changing the material and thickness of the steel sheet to satisfy an appropriate value of the heat diffusion time (which satisfies the more desirable condition that the temperature difference between the steel sheet surface and the center becomes −10 ° C.). ) And α (a coefficient peculiar to the equipment row) was determined, and it was found that this value was constant.
【００４５】エッジヒータ設置の効果を調べるため、仕
上げ圧延後の幅方向の分布温度を測定したものが図４で
ある。このようにエッジヒータを設けることで、幅方向
に一様な温度分布を得ることができ、幅方向に均質な製
品特性を得ることができるため、幅端部の温度を確保す
るために初期温度や、再加熱温度を高く設定する必要が
無かった。FIG. 4 shows the measured distribution temperature in the width direction after finish rolling in order to examine the effect of the installation of the edge heater. By providing the edge heater in this manner, a uniform temperature distribution can be obtained in the width direction, and uniform product characteristics can be obtained in the width direction. Also, there was no need to set the reheating temperature high.
【００４６】本発明の実施例の実験的な誘導加熱装置の
前には、３ロール式の矯正機を設置したが、その位置を
移動して矯正終了からの再加熱開始までの時間を変えて
加熱終了直後の表面温度を放射温度計で測定したところ
図６に示すように、本発明に属する熱拡散時間内に設定
することで表面温度を低下させることが可能であった。
図中の矢印で示した本発明における矯正から再加熱ま
での時間の範囲を越えると、表面温度が高くなり、本実
施例においては、１２５０℃に達して表面品質が劣化
し、かつ表面から放散する熱も大きくなった。Before the experimental induction heating apparatus of the embodiment of the present invention, a three-roll type straightening machine was installed, but the position was moved to change the time from the end of straightening to the start of reheating. When the surface temperature immediately after the completion of the heating was measured with a radiation thermometer, as shown in FIG. 6, it was possible to lower the surface temperature by setting the temperature within the heat diffusion time belonging to the present invention.
Exceeding the range of the time from straightening to reheating in the present invention indicated by the arrow in the drawing, the surface temperature increases, and in this embodiment, reaches 1250 ° C., the surface quality is deteriorated, and the heat is radiated from the surface. The heat to do it also got bigger.
【００４７】本発明の設備列において一定の誘導加熱電
力を投入した際の、励起周波数と仕上げ圧延後の板表面
温度の関係を調べたものが図５である。熱延の仕上げ前
の板厚では、１０００Ｈｚを下回る周波数では、板厚１
０ｍｍの加熱能力が極端に悪く、３０００Ｈｚを越える
と板厚５０ｍｍの加熱能力が低下した。FIG. 5 shows the relationship between the excitation frequency and the sheet surface temperature after finish rolling when a fixed induction heating power is applied to the equipment row of the present invention. At the frequency below 1000 Hz, the thickness before hot-rolling finish is 1
The heating capacity at 0 mm was extremely poor, and when exceeding 3000 Hz, the heating capacity at a plate thickness of 50 mm was reduced.
【００４８】このように、本発明の配置であっても、投
入した電力を仕上げ圧延の温度に有効に利用できるよう
な周波数が存在し、１０００〜３０００Ｈｚに至る周波
数帯であった。As described above, even with the arrangement of the present invention, there are frequencies at which the supplied electric power can be used effectively for the temperature of the finish rolling, and the frequency range is from 1000 to 3000 Hz.
【００４９】[0049]
【表１】 [Table 1]
【００５０】[0050]
【発明の効果】本発明によれば、複数の圧延機の中間に
ソレノイド式誘導加熱による再加熱装置を設け、与えた
熱が内部に拡散する時間が確保できるように設備を配置
し、あるいは、その設備も条件に応じた運用ができるよ
うにすることで、圧延前の加熱炉での被圧延材加熱温度
を低く設定することができ、材質を確保し、仕上げ圧延
機への負荷を低減し、粗圧延での熱エネルギーの損失を
小さくすることができ、再加熱における熱エネルギーを
効率的に使える効果がある。According to the present invention, a reheating device by solenoid-type induction heating is provided in the middle of a plurality of rolling mills, and equipment is arranged so as to secure time for the applied heat to diffuse inside, or By enabling the equipment to operate according to the conditions, the heating temperature of the material to be rolled in the heating furnace before rolling can be set low, ensuring the material and reducing the load on the finishing mill. In addition, the heat energy loss in the rough rolling can be reduced, and the heat energy in the reheating can be used efficiently.
【図１】本発明の実施の形態に係る熱間圧延設備の各装
置の構成を示す側面図。FIG. 1 is a side view showing a configuration of each device of a hot rolling facility according to an embodiment of the present invention.
【図２】本発明の実施例に係る熱拡散時間とデスケーリ
ング直前及び仕上げ圧延直後の板表面温度との関係を示
す図。FIG. 2 is a diagram showing a relationship between a heat diffusion time and a sheet surface temperature immediately before descaling and immediately after finish rolling according to an embodiment of the present invention.
【図３】本発明の実施例に係る熱拡散時間と板の表面温
度と板厚中央の温度差との関係を示す図。FIG. 3 is a diagram illustrating a relationship between a heat diffusion time, a surface temperature of a plate, and a temperature difference at a center of a plate thickness according to the embodiment of the present invention.
【図４】本発明の実施例に係るエッジヒータの付与によ
る仕上げ圧延後の板幅方向の温度分布を示す図。FIG. 4 is a diagram showing a temperature distribution in a sheet width direction after finish rolling by application of an edge heater according to an embodiment of the present invention.
【図５】本発明の実施例に係る再加熱装置の周波数と仕
上げ圧延後の板表面温度との関係を示す図。FIG. 5 is a diagram showing the relationship between the frequency of the reheating device and the sheet surface temperature after finish rolling according to the embodiment of the present invention.
【図６】本発明の実施例に係る矯正完了から再加熱まで
の時間と再加熱後の板表面温度との関係を示す図。FIG. 6 is a diagram showing a relationship between a time from completion of straightening to reheating and a sheet surface temperature after reheating according to the embodiment of the present invention.
１…鋼スラブ ２…粗圧延機 ３…鋼板 ４…ソレノイド式の誘導加熱装置 ５…デスケーリング装置 ６…仕上げ圧延機 ７…搬送ローラ ８…加熱終了から次工程に至るまでの時間的距離 ９…エッジヒータ １０…形状矯正装置 DESCRIPTION OF SYMBOLS 1 ... Steel slab 2 ... Rough rolling mill 3 ... Steel plate 4 ... Solenoid type induction heating device 5 ... Descaling device 6 ... Finishing rolling mill 7 ... Transport roller 8 ... Time distance from the end of heating to the next process 9 ... Edge heater 10: Shape correction device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０５Ｂ 6/10 ３８１ Ｈ０５Ｂ 6/10 ３８１ (72)発明者 山本 雅明 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 江田 尚智 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 寺内 琢雅 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification symbol FI H05B 6/10 381 H05B 6/10 381 (72) Inventor Masaaki Yamamoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Stock Within the Company (72) Inventor Naoshichi Eda 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Takuya Terauchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Stock In company
Claims (16)
る工程と、粗圧延した被圧延材を仕上げ圧延機で仕上げ
圧延する工程とを備え、少なくとも仕上げ圧延工程の前
に被圧延材をソレノイド式の誘導加熱装置で再加熱する
工程を備えたことを特徴とする鋼板の熱間圧延方法。1. A step of roughly rolling a heated material to be rolled by a rough rolling machine, and a step of finish rolling the roughly rolled material to be rolled by a finish rolling machine. A step of reheating the steel sheet with a solenoid-type induction heating device.
圧延工程前の被圧延材の表面温度が板厚中央の温度より
低くなるように設置されることを特徴とする請求項１に
記載の鋼板の熱間圧延方法。2. The steel sheet according to claim 1, wherein the solenoid-type induction heating device is installed such that the surface temperature of the material to be rolled before the finish rolling step is lower than the temperature at the center of the sheet thickness. Hot rolling method.
て、その加熱位置を調節することを特徴とする請求項２
に記載の鋼板の熱間圧延方法。3. The heating position of the solenoid-type induction heating device is adjusted by moving the solenoid-type induction heating device.
2. The hot rolling method for a steel sheet according to item 1.
置し、使用する加熱装置を選択することにより加熱位置
を調節することを特徴とする請求項２に記載の鋼板の熱
間圧延方法。4. The hot rolling method for a steel sheet according to claim 2, wherein a plurality of solenoid-type induction heating devices are installed, and a heating position is adjusted by selecting a heating device to be used.
に従って設定することを特徴とする請求項２乃至４のい
ずれかに記載の鋼板の熱間圧延方法。 Ｔ：熱拡散時間、α：設備列に固有の係数、ρ：板の密
度、Ｃp ：板の比熱、λ：板の熱伝導率、Ｈ：板の厚さ
とするとき、 Ｔ＝α×（ρＣp ／λ）×Ｈ2 …（１）5. The hot rolling method for a steel sheet according to claim 2, wherein the heat diffusion time in the thickness direction is set according to the following equation (1). T: thermal diffusion time, α: coefficient specific to equipment row, ρ: density of plate, C p : specific heat of plate, λ: thermal conductivity of plate, H: thickness of plate, T = α × ( ρC p / λ) × H 2 (1)
仕上げ圧延工程との間にさらにエッジヒータを配置し、
被圧延材の板幅方向端部を加熱することを特徴とする請
求項１乃至５のいずれかに記載の鋼板の熱間圧延方法。6. The reheating step of the material to be rolled, wherein an edge heater is further arranged between the rough rolling step and the finish rolling step,
The hot rolling method for a steel sheet according to any one of claims 1 to 5, wherein an end portion in a width direction of the material to be rolled is heated.
正した後に、再加熱することを特徴とする請求項１乃至
６のいずれかに記載の鋼板の熱間圧延方法。7. The hot rolling method for a steel sheet according to claim 1, wherein in the step of reheating the material to be rolled, the material to be rolled is reheated after straightening.
圧延機の入側に設置し、その励起周波数を１０００〜３
０００Ｈｚに設定することを特徴とする請求項１乃至７
のいずれかに記載の鋼板の熱間圧延方法。8. An induction heating device of a solenoid type is installed on the entrance side of a finishing mill, and its excitation frequency is set to 1000-3.
000 Hz is set.
The hot rolling method for a steel sheet according to any one of the above.
と、粗圧延した被圧延材を仕上げ圧延する仕上げ圧延機
とを備えた鋼板の熱間圧延設備において、少なくとも仕
上げ圧延機の前に被圧延材を再加熱するソレノイド式の
誘導加熱装置を備えてなることを特徴とする鋼板の熱間
圧延設備。9. A steel plate hot rolling facility comprising a rough rolling mill for roughly rolling a heated material to be rolled and a finish rolling machine for finish rolling of a roughly rolled material to be rolled, wherein at least before the finish rolling mill A hot-rolling equipment for a steel sheet, further comprising a solenoid-type induction heating device for reheating the material to be rolled.
げ圧延機に至る前の被圧延材の表面温度が板厚中央の温
度より低くなるように設置されていることを特徴とする
請求項９に記載の鋼板の熱間圧延設備。10. The apparatus according to claim 9, wherein the solenoid-type induction heating device is installed such that the surface temperature of the material to be rolled before reaching the finishing mill is lower than the temperature at the center of the plate thickness. A hot-rolling equipment for the described steel sheet.
されて、その加熱位置を調節されることを特徴とする請
求項１０に記載の鋼板の熱間圧延設備。11. The hot-rolling equipment for a steel sheet according to claim 10, wherein the solenoid-type induction heating device is moved to adjust a heating position.
台設置され、使用する加熱装置を選択することにより加
熱位置を調節されることを特徴とする請求項１０に記載
の鋼板の熱間圧延設備。12. The hot-rolling equipment for a steel sheet according to claim 10, wherein a plurality of solenoid-type induction heating devices are provided, and a heating position is adjusted by selecting a heating device to be used. .
式に従って設定されることを特徴とする請求項１０乃至
１２のいずれかに記載の鋼板の熱間圧延設備。 Ｔ：熱拡散時間、α：設備列に固有の係数、ρ：板の密
度、Ｃp ：板の比熱、λ：板の熱伝導率、Ｈ：板の厚さ
とするとき、 Ｔ＝α×（ρＣp ／λ）×Ｈ2 …（１）13. The heat diffusion time in the thickness direction is as follows:
The hot-rolling equipment for a steel sheet according to any one of claims 10 to 12, wherein the hot-rolling equipment is set according to a formula. T: thermal diffusion time, α: coefficient specific to equipment row, ρ: density of plate, C p : specific heat of plate, λ: thermal conductivity of plate, H: thickness of plate, T = α × ( ρC p / λ) × H 2 (1)
材の板幅方向端部を加熱するエッジヒータが、さらに設
置されていることを特徴とする請求項９乃至１３のいず
れかに記載の鋼板の熱間圧延設備。14. An apparatus according to claim 9, further comprising an edge heater for heating an end portion in the sheet width direction of the material to be rolled, between the rough rolling mill and the finishing rolling mill. A hot-rolling equipment for the described steel sheet.
被圧延材を矯正する形状矯正装置が、設置されているこ
とを特徴とする請求項９乃至１４のいずれかに記載の鋼
板の熱間圧延設備。15. The hot-rolling of a steel sheet according to claim 9, wherein a shape straightening device for straightening the material to be rolled is provided on the inlet side of the solenoid-type induction heating device. Rolling equipment.
げ圧延機の入側に設置され、その励起周波数を１０００
〜３０００Ｈｚに設定されていることを特徴とする請求
項９乃至１５のいずれかに記載の鋼板の熱間圧延設備。16. An induction heating device of a solenoid type is installed on the entrance side of a finishing mill, and has an excitation frequency of 1000.
The hot rolling equipment for steel sheets according to any one of claims 9 to 15, wherein the frequency is set to -3000 Hz.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29001096A JP3345770B2 (en) | 1996-10-31 | 1996-10-31 | Hot rolling method of steel sheet and its equipment |
| US08/958,069 US5990464A (en) | 1996-10-30 | 1997-10-27 | Method for producing hot rolled steel sheet using induction heating and apparatus therefor |
| KR1019970056078A KR100254494B1 (en) | 1996-10-30 | 1997-10-29 | Method for producing hot rolled steel sheet and apparatus therefor |
| EP01126517A EP1179375B1 (en) | 1996-10-30 | 1997-10-30 | Method for producing hot rolled steel sheet and apparatus therefor |
| DE69712704T DE69712704T2 (en) | 1996-10-30 | 1997-10-30 | Method and device for producing hot-rolled steel sheet |
| EP97118950A EP0839588B1 (en) | 1996-10-30 | 1997-10-30 | Method for producing hot rolled steel sheet and apparatus therefor |
| DE69736208T DE69736208T2 (en) | 1996-10-30 | 1997-10-30 | Method and device for producing hot-rolled steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29001096A JP3345770B2 (en) | 1996-10-31 | 1996-10-31 | Hot rolling method of steel sheet and its equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10128424A true JPH10128424A (en) | 1998-05-19 |
| JP3345770B2 JP3345770B2 (en) | 2002-11-18 |
Family
ID=17750619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29001096A Expired - Fee Related JP3345770B2 (en) | 1996-10-30 | 1996-10-31 | Hot rolling method of steel sheet and its equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3345770B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7694870B2 (en) * | 2002-12-06 | 2010-04-13 | Bauder Hans-Joerg | Method for the production of a strip comprising a staggered profile that runs in the longitudinal direction thereof |
-
1996
- 1996-10-31 JP JP29001096A patent/JP3345770B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7694870B2 (en) * | 2002-12-06 | 2010-04-13 | Bauder Hans-Joerg | Method for the production of a strip comprising a staggered profile that runs in the longitudinal direction thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3345770B2 (en) | 2002-11-18 |
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