JPH09225505A - Rolling method of hot rolled strip - Google Patents
Rolling method of hot rolled stripInfo
- Publication number
- JPH09225505A JPH09225505A JP8032171A JP3217196A JPH09225505A JP H09225505 A JPH09225505 A JP H09225505A JP 8032171 A JP8032171 A JP 8032171A JP 3217196 A JP3217196 A JP 3217196A JP H09225505 A JPH09225505 A JP H09225505A
- Authority
- JP
- Japan
- Prior art keywords
- rolling mill
- hot
- rough
- rough bar
- finish rolling
- 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
Landscapes
- General Induction Heating (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、連続熱間圧延機
において圧延された熱延鋼帯の圧延仕上温度を、その長
さ方向にわたり均一となし、長さ方向に均質な材質の熱
延鋼帯を製造する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a hot-rolled steel strip of a hot-rolled steel strip rolled in a continuous hot rolling mill, which has a uniform rolling finish temperature in the lengthwise direction and is made of a material homogeneous in the lengthwise direction. It relates to a method of manufacturing a strip.
【０００２】[0002]
【従来の技術】一般に、熱延鋼帯は、加熱炉においてス
ラブを所定温度に加熱し、加熱されたスラブを粗圧延機
で所定厚さに圧延して粗バーとなし、次いで、粗バー
を、複数基のスタンドからなる連続仕上圧延機において
仕上圧延して所定厚さの熱延鋼帯とし、この熱延鋼帯
を、ランアウトテーブル上の冷却スタンドにおいて冷却
した後、コイラーで巻取ることにより製造される。2. Description of the Related Art Generally, a hot-rolled steel strip is manufactured by heating a slab to a predetermined temperature in a heating furnace, rolling the heated slab to a predetermined thickness with a rough rolling machine to form a coarse bar, and then forming a coarse bar. By finishing rolling with a continuous finishing rolling mill consisting of multiple stands to form a hot-rolled steel strip with a predetermined thickness, cooling this hot-rolled steel strip at a cooling stand on a runout table, and then winding it with a coiler. Manufactured.
【０００３】このような熱延鋼帯の製造過程において、
熱延鋼帯の長さ方向に不均一な温度分布が発生する。即
ち、粗圧延機で圧延された粗バーの、仕上圧延機入側に
おける温度は、粗バーの長さ方向に均一ではなく、その
後部に至るほど低くなる。その理由は、粗圧延機で圧延
された粗バーが、粗圧延機を出てから仕上圧延機に入る
までの時間が、粗バーの後部ほど長いことに起因してい
る。In the process of manufacturing such a hot rolled steel strip,
A non-uniform temperature distribution occurs in the length direction of the hot-rolled steel strip. That is, the temperature of the rough bar rolled by the rough rolling mill on the entry side of the finishing rolling mill is not uniform in the length direction of the rough rolling mill, but becomes lower toward the rear part thereof. The reason is that the rough bar rolled by the rough rolling mill takes a longer time from the exit of the rough rolling mill to the finishing rolling mill at the rear portion of the rough bar.
【０００４】このような仕上圧延機に入る粗バーの長さ
方向の温度差を補償する手段として、従来、仕上圧延機
で圧延される粗バーの圧延速度を一定とせず、仕上圧延
機に粗バーの先端部が入ってから、その圧延速度を高め
る「ズーミング」と称する方法が行われている。As a means for compensating for the temperature difference in the lengthwise direction of the rough bar entering the finish rolling mill, conventionally, the rolling speed of the rough bar rolled by the finish rolling mill is not constant but the rough rolling is performed by the finish rolling mill. A method called "zooming" is used to increase the rolling speed of the bar after it is inserted.
【０００５】仕上圧延機による粗バーの仕上圧延を、上
述した「ズーミング」により行うことによって、粗バー
の仕上圧延に要する時間は、粗バーの前部よりも後部の
方が短くなる。その結果、仕上圧延機によって仕上圧延
される粗バーの、圧延ロールとの接触による抜熱および
放射による温度低下は、粗バーの後部ほど小になり、且
つ、圧延ロールの圧下によって生ずる加工発熱は、粗バ
ーの後部ほど大になる。従って、仕上圧延機によって仕
上圧延された熱延鋼帯の、圧延機出側における温度分布
は、鋼帯の先端部が低く、その後端部が高くなる傾向に
なり、熱延鋼帯の温度分布を、その長さ方向に均一化し
得るとされている。By performing the finish rolling of the rough bar by the finish rolling machine by the above-mentioned "zooming", the time required for finish rolling of the rough bar is shorter in the rear part than in the front part of the rough bar. As a result, the rough bar finish-rolled by the finish rolling mill, the heat removal due to the contact with the rolling rolls and the temperature decrease due to the radiation are smaller toward the rear part of the rough bar, and the processing heat generated by the reduction of the rolling rolls is not generated. The larger the rear part of the coarse bar, the larger. Therefore, the temperature distribution of the hot-rolled steel strip finish-rolled by the finish rolling mill on the rolling mill exit side tends to be low at the leading end of the steel strip and high at the trailing end of the hot-rolled steel strip. Is said to be uniform in the length direction.
【０００６】[0006]
【発明が解決しようとする課題】炭素鋼からなるスラブ
を連続熱間圧延するに際し、材質確保の観点から、仕上
圧延機における圧延仕上温度を、フェライト変態開始温
度（Ar3 温度）よりも高くする必要がある。圧延中にフ
ェライト変態が生ずると、フェライト粒の成長やフェラ
イト中への歪みの蓄積によって、鋼帯の強度、延性、靭
性等の特性が劣化するおそれが生ずる。In continuous hot rolling of a carbon steel slab, the rolling finishing temperature in the finishing rolling mill is set higher than the ferrite transformation start temperature (Ar 3 temperature) from the viewpoint of securing the material quality. There is a need. When ferrite transformation occurs during rolling, the properties such as strength, ductility, and toughness of the steel strip may deteriorate due to the growth of ferrite grains and the accumulation of strain in the ferrite.
【０００７】従って、仕上圧延された熱延鋼帯のうち、
圧延仕上温度を Ar3温度以上に確保することができなか
った部分は不良品となるため、製品歩留りが低下する。
実操業においては、熱延鋼帯の幅全体にわたって圧延仕
上温度をAr3 温度以上に保つために、目標仕上温度を設
定し、圧延仕上温度が目標仕上温度になるように圧延を
行っている。Therefore, among the hot rolled steel strips that have been finish rolled,
The part where the rolling finishing temperature could not be kept above the Ar 3 temperature becomes a defective product, and the product yield decreases.
In actual operation, a target finishing temperature is set in order to keep the rolling finishing temperature at the Ar 3 temperature or higher over the entire width of the hot-rolled steel strip, and rolling is performed so that the rolling finishing temperature becomes the target finishing temperature.
【０００８】上述した仕上圧延機に粗バーの先端部が入
ってから圧延速度を高める「ズーミング」法によって粗
バーの長さ方向の温度差を補償する場合、圧延速度が所
定速度に加速された後は、熱延鋼帯の圧延仕上温度を目
標仕上温度以上に高めることができる。When the temperature difference in the longitudinal direction of the rough bar is compensated by the "zooming" method of increasing the rolling speed after the tip of the rough bar is inserted into the finish rolling mill, the rolling speed is accelerated to a predetermined speed. After that, the rolling finish temperature of the hot-rolled steel strip can be raised to the target finish temperature or higher.
【０００９】しかしながら、粗バーの先端部が仕上圧延
機に入ってから、圧延速度が所定速度にまで早められる
までの加速が不十分な間は、熱延鋼帯の圧延仕上温度を
目標仕上温度以上に高めることができず、他の部分に比
べて低くなる。厚さが１．６mm以下の薄鋼帯の場合、こ
のような低温部分はその先端部から約３０％の広範囲に
及ぶ。However, while the acceleration from the end of the rough bar entering the finish rolling mill to the speed increase to the predetermined speed is insufficient, the rolling finish temperature of the hot-rolled steel strip is set to the target finishing temperature. It cannot be increased more than the above and becomes lower than other parts. In the case of a thin steel strip having a thickness of 1.6 mm or less, such a low temperature portion extends from its tip portion to a wide range of about 30%.
【００１０】このように、熱延鋼帯の仕上圧延に当り、
従来の「ズーミング」法によっては、熱延鋼帯の長さ方
向全体にわたって圧延仕上温度を均一に保つことは困難
であり、特に、厚さが１．６mm以下の薄鋼帯の場合に
は、その先端部から約３０％の広範囲にわたって、圧延
仕上温度を目標仕上温度以上に高めることができず、製
品歩留りの低下を招いていた。In this way, in the finish rolling of the hot rolled steel strip,
With the conventional "zooming" method, it is difficult to keep the rolling finish temperature uniform over the entire length of the hot-rolled steel strip. Especially, in the case of a thin steel strip having a thickness of 1.6 mm or less, In a wide range of about 30% from the tip, the rolling finishing temperature could not be raised to the target finishing temperature or higher, resulting in a decrease in product yield.
【００１１】上述した問題を解決する手段として、特開
平７−155822号公報には、粗圧延機で圧延された粗バー
に対し、仕上圧延機の入側において、通電加熱装置によ
りその先端部を直接加熱して先端部の温度を高める方法
（以下、先行技術１という）が開示されている。しかし
ながら、先行技術１においては、粗バーを直接通電加熱
するものであるために、通電中にスパークが発生して粗
バーの一部が溶融し、疵が生ずる問題がある。As a means for solving the above-mentioned problems, Japanese Patent Laid-Open No. 7-155822 discloses that a leading end of a rough bar rolled by a rough rolling mill is installed on the inlet side of a finish rolling mill by an electric heating device. A method of directly heating to raise the temperature of the tip portion (hereinafter referred to as prior art 1) is disclosed. However, in Prior Art 1, since the coarse bar is directly heated by energization, there is a problem that sparks are generated during energization and a part of the coarse bar is melted to cause a flaw.
【００１２】また、特開平４−33715 号公報および特開
平４−190916号公報には、粗バーの長さ方向端部をヒー
タによって加熱する方法（以下、先行技術２という）が
開示されている。しかしながら、先行技術２の方法は、
粗バーの長さ方向端部のみを加熱するものであり、粗バ
ーの長さ方向を広い範囲にわたり加熱するものではな
い。Further, Japanese Patent Laid-Open Nos. 4-33715 and 4-190916 disclose a method (hereinafter referred to as prior art 2) of heating the end portion in the length direction of the rough bar with a heater. . However, the method of Prior Art 2 is
Only the lengthwise ends of the coarse bar are heated, and the lengthwise direction of the coarse bar is not heated over a wide range.
【００１３】従って、この発明の目的は、上述した問題
を解決し、熱延鋼帯の仕上圧延に当り、熱延鋼帯の長さ
方向全体にわたって圧延仕上温度を所定温度以上に高め
そして均一に保つことができ、しかも、加熱により疵等
が発生することがなく、均質な材質の熱延鋼帯を歩留り
高く製造し得る方法を提供することにある。Therefore, an object of the present invention is to solve the above-mentioned problems, and in finish rolling of a hot-rolled steel strip, raise the rolling finish temperature to a predetermined temperature or more and make it uniform over the entire length of the hot-rolled steel strip. It is an object of the present invention to provide a method which can maintain the temperature and does not generate a flaw or the like due to heating and can manufacture a hot-rolled steel strip of a homogeneous material with high yield.
【００１４】[0014]
【課題を解決するための手段】本発明者等は、上述した
観点から、熱延鋼帯の仕上圧延に当り、熱延鋼帯の長さ
方向全体にわたって圧延仕上温度を所定温度以上に高め
そして均一に保つことができる方法を開発すべく鋭意研
究を重ねた。その結果、粗バーの先端部が仕上圧延機に
入ってから、「ズーミング」によって圧延速度が所定温
度に十分に加速されるまでの間、仕上圧延機入側におい
て粗バーの先端部を誘導加熱装置により加熱すれば、仕
上圧延機での圧延仕上温度を、熱延鋼帯の長さ方向に均
一化することができ、加熱により疵等が発生することが
なく、均質な材質の熱延鋼帯を歩留り高く製造し得るこ
とを知見した。From the above-mentioned viewpoints, the inventors of the present invention, when finishing rolling a hot-rolled steel strip, raise the rolling finishing temperature to a predetermined temperature or more over the entire length of the hot-rolled steel strip, and We have earnestly studied to develop a method that can maintain the uniformity. As a result, the tip of the rough bar is induction-heated on the entry side of the finishing mill from the time the tip of the rough bar enters the finishing mill until the rolling speed is sufficiently accelerated to a predetermined temperature by "zooming". By heating with a device, the rolling finishing temperature in the finishing rolling mill can be made uniform in the length direction of the hot-rolled steel strip. It was found that the band can be manufactured with high yield.
【００１５】この発明は、上記知見に基づいてなされた
ものであって、請求項１に記載の発明は、所定温度に加
熱されたスラブを粗圧延機によって粗圧延し、次いで、
粗圧延された粗バーを連続熱間仕上圧延機によって仕上
げ圧延するに際し、前記仕上圧延機の入側における前記
粗バーの長さ方向の温度分布を均一化するために、前記
仕上圧延機における前記粗バーの圧延速度を、前記粗バ
ーの先端部が前記仕上圧延機に入ってから加速する熱延
鋼帯の圧延方法において、前記仕上圧延機で圧延される
前記粗バーが所定速度に加速されるまでの間、前記仕上
圧延機の入側に設けられた誘導加熱装置により前記粗バ
ーを加熱し、かくして、前記仕上圧延機により圧延され
る前記粗バーの温度分布を、その先端部から後端部に至
るまで長さ方向に均一化し、均質な材質の熱延鋼帯を製
造することに特徴を有するものである。The present invention has been made on the basis of the above-mentioned findings. The invention according to claim 1 rough-rolls a slab heated to a predetermined temperature by a rough-rolling machine, and then,
When finish rolling the rough rolled rough bar by a continuous hot finishing mill, in order to make the temperature distribution in the length direction of the rough bar on the inlet side of the finishing mill uniform, the finish rolling machine In the rolling method of the hot-rolled steel strip, which accelerates the rolling speed of the rough bar after the tip of the rough bar enters the finishing mill, the rough bar rolled by the finishing mill is accelerated to a predetermined speed. Until that time, the rough bar is heated by an induction heating device provided on the inlet side of the finish rolling mill, and thus the temperature distribution of the rough bar rolled by the finish rolling mill is changed from the tip to the rear. It is characterized in that the hot-rolled steel strip is made of a uniform material by making it uniform in the length direction up to the end.
【００１６】この出願の請求項２に記載の発明は、前記
誘導加熱装置の入側に粗バー先端検知器を設け、前記検
知器により前記粗バーの先端が前記誘導加熱装置に到達
したことを検知した時点で、前記誘導加熱装置による前
記粗バーの加熱を開始し、そして、前記仕上圧延機の最
終スタンドのロール周速および前記仕上圧延機出側にお
ける熱延鋼帯の温度が一定条件を満たしたときに前記粗
バーの加熱を止めることに特徴を有するものである。According to a second aspect of the present application, a coarse bar tip detector is provided on the inlet side of the induction heating device, and the tip of the rough bar reaches the induction heating device by the detector. At the time of detection, the heating of the rough bar by the induction heating device is started, and the roll peripheral speed of the final stand of the finishing rolling mill and the temperature of the hot-rolled steel strip on the exit side of the finishing rolling mill are kept constant. It is characterized in that the heating of the rough bar is stopped when it is filled.
【００１７】[0017]
【発明の実施の形態】図１は、この発明の方法を示す連
続熱間圧延ラインの概略説明図である。図１に示すよう
に、粗圧延機１、誘導加熱装置４および複数スタンドか
らなる連続熱間仕上圧延機６がこの順序で配置されてい
る。３は誘導加熱装置４の入側に設けられた、粗圧延機
１によって粗圧延された粗バー２の先端を検出するため
の粗バー先端検出器、５は仕上圧延機入側温度計、７は
仕上圧延機出側温度計である。1 is a schematic explanatory view of a continuous hot rolling line showing the method of the present invention. As shown in FIG. 1, a rough rolling mill 1, an induction heating device 4, and a continuous hot finish rolling mill 6 including a plurality of stands are arranged in this order. 3 is a rough bar tip detector for detecting the tip of the rough bar 2 roughly rolled by the rough rolling machine 1 provided on the inlet side of the induction heating device 4, 5 is a thermometer on the inlet side of the finish rolling machine, 7 Is a thermometer on the exit side of the finishing rolling mill.
【００１８】粗圧延機１で圧延された粗バー２は、仕上
圧延機６の入側に設置された誘導加熱装置４により、図
２に部分概略平面図で示すように、その幅方向全体にわ
たり加熱される。The rough bar 2 rolled by the rough rolling mill 1 is spread over the entire width thereof by the induction heating device 4 installed on the inlet side of the finish rolling mill 6, as shown in a partial schematic plan view of FIG. Be heated.
【００１９】粗圧延機１によって粗圧延された粗バー２
の先端部を、誘導加熱装置４の入側に設けられた検出器
３が検出すると、誘導加熱装置４のスイッチが入り、誘
導加熱装置４によって粗バー２の加熱が開始される。加
熱された粗バー２は連続熱間仕上圧延機６に導かれ仕上
圧延されるが、そのときの仕上圧延機６の圧延速度は、
粗バー２の先端部が入ってから「ズーミング」によって
早められ、粗バーの仕上圧延に要する時間は、粗バーの
前部よりも後部の方が短くなる。仕上圧延機の圧延速度
が所定速度にまで加速され、圧延仕上温度が目標温度以
上になったときに、誘導加熱装置４による粗バー２の加
熱を止める。A rough bar 2 roughly rolled by a rough rolling mill 1.
When the detector 3 provided on the inlet side of the induction heating device 4 detects the tip end of the induction heating device 4, the induction heating device 4 is turned on, and the induction heating device 4 starts heating the coarse bar 2. The heated rough bar 2 is guided to the continuous hot finish rolling mill 6 for finish rolling, and the rolling speed of the finish rolling mill 6 at that time is
After the leading end of the rough bar 2 is inserted, it is accelerated by "zooming", and the time required for finish rolling the rough bar is shorter in the rear part than in the front part of the rough bar. The heating of the rough bar 2 by the induction heating device 4 is stopped when the rolling speed of the finish rolling mill is accelerated to a predetermined speed and the rolling finishing temperature becomes equal to or higher than the target temperature.
【００２０】このようにして、仕上圧延機６におけるズ
ーミングによって仕上圧延される熱延鋼帯の圧延速度が
所定速度に早められるまでの間、即ち、圧延仕上温度が
目標温度に達するまでの間、誘導加熱装置４による粗バ
ーの加熱により補償されるので、熱延鋼帯の長さ方向全
体にわたって目標仕上温度以上の均一な温度となり、均
質な材質の熱延鋼帯を製造することができる。Thus, until the rolling speed of the hot-rolled steel strip finish-rolled by zooming in the finishing rolling mill 6 is increased to a predetermined speed, that is, until the rolling finishing temperature reaches the target temperature. Since it is compensated by the heating of the rough bar by the induction heating device 4, a uniform temperature equal to or higher than the target finishing temperature is obtained over the entire length of the hot rolled steel strip, and a hot rolled steel strip of a homogeneous material can be manufactured.
【００２１】[0021]
【実施例】次に、この発明の方法を、実施例により更に
説明する。加熱炉において、１２８０℃の温度に加熱さ
れた、厚さ２２６mm、幅１０５０mm、長さ９２００mmの
寸法の炭素鋼からなるスラブを、図１に示す粗圧延機１
において９６％の圧下率により粗圧延し、次いで、７ス
タンドからなる連続熱間仕上圧延機５において、９６％
の圧下率により仕上圧延した。仕上圧延機６は、粗バー
２の先端部が入ってから、「ズーミング」によってその
圧延速度を加速した。粗圧延機１において粗圧延された
粗バー２の先端部が、誘導加熱装置４の入側に設けられ
た検出機３で検出されたときに、誘導加熱装置４のスイ
ッチを入れ、誘導加熱装置４によって粗バー２の加熱を
開始した。Next, the method of the present invention will be further described with reference to examples. A slab made of carbon steel having a thickness of 226 mm, a width of 1050 mm and a length of 9200 mm, which was heated in a heating furnace to a temperature of 1280 ° C., was used as a rough rolling mill 1 shown in FIG.
Rough rolling at a reduction ratio of 96% in the following, and then 96% in a continuous hot finish rolling mill 5 consisting of 7 stands.
Finish rolling was carried out according to the rolling reduction. The finishing rolling mill 6 accelerated the rolling speed by "zooming" after the tip of the rough bar 2 was inserted. When the tip end of the rough bar 2 roughly rolled in the rough rolling mill 1 is detected by the detector 3 provided on the inlet side of the induction heating device 4, the induction heating device 4 is turned on to turn on the induction heating device. The heating of the coarse bar 2 was started by 4.
【００２２】図３に、仕上圧延機６の最終スタンドにお
けるロール周速と圧延時間との関係を示す。上述した
「ズーミング」によって、時間と共に仕上圧延機６のロ
ール周速は早められ、操業条件から決定される最大ロー
ル周速ｔ0 に到達すると、それ以降は一定速度になる。FIG. 3 shows the relationship between the roll peripheral speed and the rolling time in the final stand of the finish rolling mill 6. By the above-mentioned "zooming", the roll peripheral speed of the finish rolling mill 6 is increased with time, and when it reaches the maximum roll peripheral speed t 0 determined from the operating condition, it becomes a constant speed thereafter.
【００２３】上述した仕上圧延機６の最終スタンドロー
ル周速と、仕上圧延機出側温度計７で検出された熱延鋼
帯の温度とが適当な条件を満たす時間ｔ1 （後述する図
４に示す目標仕上温度を超えたとき）において、誘導加
熱装置４のスイッチを切った。従って、それ以降、粗バ
ーは誘導加熱装置４によっては加熱されず、仕上圧延機
６の「ズーミング」によって、粗バーの仕上圧延に要す
る時間が短くなり、その結果、仕上圧延機６によって仕
上圧延された熱延鋼帯の長さ方向の温度分布は均一にな
った。The time t 1 of the final stand roll peripheral speed of the finish rolling mill 6 and the temperature of the hot-rolled steel strip detected by the finish rolling mill outlet side thermometer 7 satisfy the appropriate condition (see FIG. 4 which will be described later). When the target finishing temperature shown in (1) was exceeded), the induction heating device 4 was switched off. Therefore, after that, the rough bar is not heated by the induction heating device 4, and the time required for finish rolling of the rough bar is shortened by the "zooming" of the finish rolling mill 6, and as a result, the finish rolling is performed by the finish rolling mill 6. The temperature distribution in the longitudinal direction of the hot-rolled steel strip thus formed became uniform.
【００２４】図４に、仕上圧延機出側温度計７で測定さ
れた、熱延鋼帯の長さ方向の温度分布を示す。図４に黒
丸印で示すように、圧延仕上温度は、熱延鋼帯の長さ方
向にわたって均一であり、目標仕上温度以上を確保する
ことができた。なお、上述した誘導加熱装置４のスイッ
チを切る時間ｔ1 は、図４に示す熱延鋼帯の目標仕上温
度を超えたときである。FIG. 4 shows the temperature distribution in the length direction of the hot-rolled steel strip measured by the thermometer 7 on the exit side of the finish rolling mill. As indicated by black circles in FIG. 4, the rolling finishing temperature was uniform in the length direction of the hot-rolled steel strip, and the target finishing temperature or higher could be secured. The time t 1 for switching off the induction heating device 4 described above is when the target finishing temperature of the hot-rolled steel strip shown in FIG. 4 is exceeded.
【００２５】これに対し、仕上圧延機入側において加熱
せず、仕上圧延機６の「ズーミング」のみによって圧延
した従来の場合には、図４に白丸印で示すように、熱延
鋼帯の先端から約３０％の部分は Ar3温度から決定され
る目標仕上温度以下となり、材質の劣化が生じた。On the other hand, in the case of the conventional rolling in which only the "zooming" of the finish rolling mill 6 is performed without heating on the entrance side of the finish rolling mill, as shown by the white circles in FIG. About 30% from the tip was below the target finishing temperature determined from the Ar 3 temperature, and the material deteriorated.
【００２６】特に、１．６mm以下の板厚の薄鋼帯の場合
には、従来、鋼帯の先端部付近で圧延仕上温度が Ar3以
下になるために、歩留りが低下する問題があったが、こ
の発明の方法によれば、粗バーの先端部が仕上圧延機に
入ってから、「ズーミング」によって圧延速度が十分に
加速されるまでの間、仕上圧延機入側に設けられた誘導
加熱装置４による加熱によって圧延仕上温度が補償され
るので、鋼帯先端部付近の圧延仕上温度が Ar3以下にな
ることはなく、製品歩留りを向上させることができた。Particularly, in the case of a thin steel strip having a plate thickness of 1.6 mm or less, there has been a problem that the yield is lowered because the rolling finishing temperature becomes Ar 3 or less near the tip of the steel strip. However, according to the method of the present invention, after the tip of the rough bar enters the finishing mill, until the rolling speed is sufficiently accelerated by "zooming", the induction provided on the entry side of the finishing mill. Since the rolling finish temperature is compensated by the heating by the heating device 4, the rolling finish temperature in the vicinity of the front end of the steel strip does not fall below Ar 3 and the product yield can be improved.
【００２７】このようにして仕上圧延された熱延鋼帯を
冷却スタンドにおいて、約１７℃／sec で冷却した後、
コイラーで巻き取った。かくして、板厚１．２mm、幅１
０５０mmの、長さ方向に均質な材質の熱延鋼帯を製造す
ることができた。The hot-rolled steel strip thus finish-rolled is cooled at about 17 ° C./sec in a cooling stand,
I wound it up with a coiler. Thus, the plate thickness 1.2mm, width 1
It was possible to produce a hot-rolled steel strip of 050 mm, which was made of a homogeneous material in the longitudinal direction.
【００２８】[0028]
【発明の効果】以上述べたように、この発明の方法によ
れば、熱延鋼帯の仕上圧延に当り、熱延鋼帯の長さ方向
全体にわたって圧延仕上温度を所定温度以上に高め、そ
してその長さ方向にわたり一定に保つことができ、従来
Ar3温度以上の圧延仕上温度を確保することができなか
ったために製造が不可能であった、板厚の薄い熱延鋼帯
も製造することが可能になった。また、誘導加熱装置を
使用することにより、制御性が良好となって、通電加熱
で懸念されるスパークによる疵の発生も生ぜず、その
上、粗圧延されるスラブに対する再加熱温度も下げるこ
とができる等、多くの工業上有用な効果がもたらされ
る。As described above, according to the method of the present invention, in the finish rolling of the hot rolled steel strip, the rolling finishing temperature is raised to a predetermined temperature or more over the entire length of the hot rolled steel strip, and Conventionally it can be kept constant over its length
It became possible to manufacture hot-rolled steel strip with a thin plate thickness, which was impossible to manufacture because the rolling finishing temperature higher than the Ar 3 temperature could not be secured. In addition, by using the induction heating device, the controllability is improved, the occurrence of flaws due to sparks that may be a concern in energization heating does not occur, and the reheating temperature for the roughly rolled slab can be lowered. As a result, many industrially useful effects are brought about.
【図１】この発明の方法を示す連続熱間圧延ラインの概
略説明図である。FIG. 1 is a schematic explanatory view of a continuous hot rolling line showing the method of the present invention.
【図２】加熱装置部分の概略平面図である。FIG. 2 is a schematic plan view of a heating device portion.
【図３】仕上圧延機の最終スタンドにおけるロール周速
と圧延時間との関係を示すグラフである。FIG. 3 is a graph showing the relationship between roll peripheral speed and rolling time in the final stand of the finish rolling mill.
【図４】仕上圧延温度の、熱延鋼帯長さ方向の温度分布
を示すグラフである。FIG. 4 is a graph showing the temperature distribution of the finish rolling temperature in the length direction of the hot-rolled steel strip.
１ 粗圧延機 ２ 粗バー ３ 粗バー先端検出器 ４ 誘導加熱装置 ５ 仕上圧延機入側温度計 ６ 連続熱間仕上圧延機 ７ 仕上圧延機出側温度計 1 Rough rolling mill 2 Rough bar 3 Rough bar tip detector 4 Induction heating device 5 Finishing mill input side thermometer 6 Continuous hot finishing rolling mill 7 Finishing rolling machine output side thermometer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 東 祥三 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 升田 貞和 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shozo Higashi 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Sadakazu Masuda 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd.
Claims (2)
によって粗圧延し、次いで、粗圧延された粗バーを連続
熱間仕上圧延機によって仕上げ圧延するに際し、前記仕
上圧延機の入側における前記粗バーの長さ方向の温度分
布を均一化するために、前記仕上圧延機における前記粗
バーの圧延速度を、前記粗バーの先端部が前記仕上圧延
機に入ってから加速する熱延鋼帯の圧延方法において、 前記仕上圧延機で圧延される前記粗バーが所定速度に加
速されるまでの間、前記仕上圧延機の入側に設けられた
誘導加熱装置により前記粗バーを加熱し、かくして、前
記仕上圧延機により圧延される前記粗バーの温度分布
を、その先端部から後端部に至るまで長さ方向に均一化
し、均質な材質の熱延鋼帯を製造することを特徴とす
る、熱延鋼帯の圧延方法。1. A slab heated to a predetermined temperature is roughly rolled by a rough rolling mill, and then the rough rolled rough bar is finish-rolled by a continuous hot finishing mill, at the entrance side of the finishing rolling mill. Hot-rolled steel that accelerates the rolling speed of the rough bar in the finish rolling mill after the tip of the rough bar enters the finish rolling mill in order to make the temperature distribution in the longitudinal direction of the rough bar uniform. In the band rolling method, until the rough bar rolled by the finish rolling mill is accelerated to a predetermined speed, the rough bar is heated by an induction heating device provided on the inlet side of the finish rolling mill, Thus, the temperature distribution of the rough bar rolled by the finish rolling mill is made uniform in the length direction from the leading end to the trailing end thereof to produce a hot rolled steel strip of a homogeneous material. How to roll hot-rolled steel strip .
知器を設け、前記検知器により前記粗バーの先端が前記
誘導加熱装置に到達したことを検知した時点で、前記誘
導加熱装置による前記粗バーの加熱を開始し、そして、
前記仕上圧延機の最終スタンドのロール周速および前記
仕上圧延機出側における熱延鋼帯の温度が一定条件を満
たしたときに前記粗バーの加熱を止める、請求項１に記
載の方法。2. A rough bar tip detector is provided on the inlet side of the induction heating device, and when the detector detects that the tip of the rough bar has reached the induction heating device, the induction heating device is activated. Start heating the coarse bar, and
The method according to claim 1, wherein the heating of the rough bar is stopped when the roll peripheral speed of the final stand of the finish rolling mill and the temperature of the hot-rolled steel strip on the exit side of the finish rolling mill satisfy certain conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03217196A JP3243994B2 (en) | 1996-02-20 | 1996-02-20 | Hot rolled steel strip rolling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03217196A JP3243994B2 (en) | 1996-02-20 | 1996-02-20 | Hot rolled steel strip rolling method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001262189A Division JP2002143917A (en) | 2001-08-30 | 2001-08-30 | Method for rolling hot rolled steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09225505A true JPH09225505A (en) | 1997-09-02 |
| JP3243994B2 JP3243994B2 (en) | 2002-01-07 |
Family
ID=12351500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03217196A Expired - Fee Related JP3243994B2 (en) | 1996-02-20 | 1996-02-20 | Hot rolled steel strip rolling method |
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| Country | Link |
|---|---|
| JP (1) | JP3243994B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120227547A1 (en) * | 2009-11-27 | 2012-09-13 | Boehler Ybbstal Profil Gmbh | Method for producing reversible blades |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110055391A (en) * | 2019-04-24 | 2019-07-26 | 首钢集团有限公司 | A method of eliminating fine steel hot rolling edge crack defect |
-
1996
- 1996-02-20 JP JP03217196A patent/JP3243994B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120227547A1 (en) * | 2009-11-27 | 2012-09-13 | Boehler Ybbstal Profil Gmbh | Method for producing reversible blades |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3243994B2 (en) | 2002-01-07 |
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