JP3494025B2 - Hot rolled steel strip rolling method - Google Patents
Hot rolled steel strip rolling methodInfo
- Publication number
- JP3494025B2 JP3494025B2 JP23843398A JP23843398A JP3494025B2 JP 3494025 B2 JP3494025 B2 JP 3494025B2 JP 23843398 A JP23843398 A JP 23843398A JP 23843398 A JP23843398 A JP 23843398A JP 3494025 B2 JP3494025 B2 JP 3494025B2
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- Japan
- Prior art keywords
- rolling
- slab
- rough
- steel strip
- rolled steel
- 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.)
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加熱炉で所定温度
に加熱したスラブを、粗圧延、仕上圧延して熱延鋼帯を
製造する圧延方法に関し、加熱炉内でスラブの長手方向
に発生する温度変動、特にスキッドマークを除去する熱
延鋼帯の圧延方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method for producing a hot-rolled steel strip by rough rolling and finish rolling an slab heated to a predetermined temperature in a heating furnace, which is generated in the longitudinal direction of the slab in the heating furnace. The present invention relates to a method for rolling a hot-rolled steel strip for removing temperature fluctuations, especially skid marks.
【０００２】[0002]
【従来の技術】スラブを加熱炉で所定温度に加熱して、
粗圧延、仕上圧延して熱延鋼帯を製造する圧延方法にお
いて、スラブは加熱炉内でスキッドレール上に保持され
る。スラブのスキッドレールとの接触部分は、それ以外
の部分よりも低温になり、スラブの長手方向に周期的に
低温部分が発生する。この低温部分を以下の文中ではス
キッドマークと称することにする。スキッドマークは、
熱延鋼帯の板厚、板幅の変動を引き起こし問題である。
これは、スキッドマーク部では、被圧延材の変形抵抗が
高いために、他の部分より変形しにくいことに起因して
いる。2. Description of the Related Art A slab is heated to a predetermined temperature in a heating furnace,
In the rolling method of producing a hot-rolled steel strip by rough rolling and finish rolling, a slab is held on a skid rail in a heating furnace. The temperature of the contact portion of the slab with the skid rail becomes lower than that of other portions, and the low temperature portion is periodically generated in the longitudinal direction of the slab. This low temperature part will be referred to as a skid mark in the following text. The skid mark is
This is a problem because it causes variations in the thickness and width of the hot-rolled steel strip.
This is because the skid mark portion is less likely to be deformed than other portions because the material to be rolled has a high deformation resistance.
【０００３】スキッドマークを除去するための方法とし
て、特開昭５６−７１５０１号公報が開示されている。
この従来技術は、粗圧延機と仕上圧延機の間に、粗バー
を加熱するための誘導加熱コイルを設置し、誘導加熱コ
イルへの投入電力を調整して、スキッドマークの温度を
均一化するというものである。As a method for removing skid marks, Japanese Patent Laid-Open No. 56-71501 is disclosed.
In this conventional technique, an induction heating coil for heating the rough bar is installed between the rough rolling mill and the finishing rolling mill, and the electric power supplied to the induction heating coil is adjusted to make the skid mark temperature uniform. That is.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来技
術には以下のような課題がある。スキッドマークによる
板厚、板幅の変動は、粗圧延終了後の粗バーにすでに存
在する。粗バーを加熱してスキッドマークの温度を均一
化してから仕上圧延を行っても、粗バーの板厚、板幅の
変動は、そのまま熱延鋼帯に引き継がれて残ることにな
る。However, the prior art has the following problems. Variations in plate thickness and plate width due to skid marks are already present in the rough bar after the rough rolling is completed. Even if the rough bar is heated to make the temperature of the skid marks uniform and then finish rolling is performed, the fluctuations in the plate thickness and the plate width of the rough bar are inherited as they are and remain in the hot-rolled steel strip.
【０００５】本発明の目的は、上記の問題点を解決する
ために、スキッドマークに起因した熱延鋼帯長手方向の
板厚や板幅の変動を低減することが可能な熱延鋼帯の圧
延方法を提供することにある。In order to solve the above-mentioned problems, an object of the present invention is to provide a hot-rolled steel strip capable of reducing variations in the thickness and width in the longitudinal direction of the hot-rolled steel strip due to skid marks. To provide a rolling method.
【０００６】[0006]
【課題を解決するための手段】前記の課題を解決し目的
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、加熱炉にて加熱したスラブ
を粗圧延機で粗圧延して粗バーとなし、粗バーを加熱装
置で幅方向全体にわたって加熱した後、粗バーを仕上圧
延機で仕上圧延して熱延鋼帯とする圧延方法に関し、加
熱炉内でスラブの長手方向に発生した温度変動のスラブ
低温部分に相当する粗バーの位置を、加熱装置で加熱す
るにあたり、スラブ低温部分の加熱後の温度が、隣り合
ったスラブ非低温部分の加熱後の温度より高くなるよう
にすることを特徴とする、熱延鋼帯の圧延方法である。In order to solve the above problems and achieve the object, the present invention uses the following means. (1) In the rolling method of the present invention, a slab heated in a heating furnace is roughly rolled by a rough rolling machine to form a rough bar, and the rough bar is heated in the entire width direction by a heating device, and then the rough bar is finish-rolled. Regarding the rolling method of finishing rolling with a machine to form hot rolled steel strip, the position of the rough bar corresponding to the slab low temperature part of the temperature fluctuation generated in the longitudinal direction of the slab in the heating furnace is heated by the heating device. A method for rolling a hot-rolled steel strip, characterized in that the temperature of the low temperature portion after heating is set higher than the temperature of the adjacent slab non-low temperature portion after heating.
【０００７】（２）本発明の方法は、粗圧延機と仕上圧
延機の間に設置された粗バーの加熱装置がソレノイド型
誘導加熱装置であることを特徴とする、上記（１）に記
載の熱延鋼帯の圧延方法である。(2) The method according to the present invention is characterized in that the heating device for the rough bar installed between the rough rolling mill and the finishing rolling mill is a solenoid type induction heating device. Is a method for rolling hot-rolled steel strip.
【０００８】（３）本発明の方法は、粗バーを加熱する
前のスラブ非低温部分とスラブ低温部分の粗バーの温度
差をΔＴ1 、粗バーを加熱した後のスラブ非低温部分と
スラブ低温部分の粗バーの温度差をΔＴ2 、粗圧延でス
ラブに加えられる板厚方向の歪をεR 、仕上圧延で粗バ
ーに加えられる板厚方向の歪をεF と定義するとき、下
記（１）式を満たすように粗バーを加熱することを特徴
とする、上記（１）または（２）に記載の熱延鋼帯の圧
延方法である。(3) In the method of the present invention, the temperature difference between the slab non-low temperature portion before heating the rough bar and the slab low temperature portion is ΔT 1 , and the slab non-low temperature portion and slab after heating the rough bar are When the temperature difference of the rough bar in the low temperature part is defined as ΔT 2 , the strain in the plate thickness direction applied to the slab in the rough rolling is ε R , and the strain in the plate thickness direction applied to the rough bar in the finish rolling is defined as ε F , The method for rolling a hot-rolled steel strip according to the above (1) or (2), characterized in that the rough bar is heated so as to satisfy the formula (1).
【０００９】
ΔＴ2 ＝（εR ／εF ）・ΔＴ1 …（１）
なお、ここでいう「スラブ低温部分」と「スラブ非低温
部分」の関係については、図３に示すように長手方向全
体に温度分布をもつ例などを考えると、絶対レベルでは
特定されない。従って、個々の低温部分を加熱する際に
はその隣り合った非低温部分（実際的には前後の平均
値）との相対的関係から加熱量を決定する必要がある。ΔT 2 = (ε R / ε F ) · ΔT 1 (1) The relationship between the “slab low temperature portion” and the “slab non-low temperature portion” referred to here is as shown in FIG. Considering an example with a temperature distribution over the whole, it is not specified at the absolute level. Therefore, when heating each low-temperature portion, it is necessary to determine the heating amount from the relative relationship with the adjacent non-low-temperature portion (actually, the average value before and after).
【００１０】[0010]
【発明の実施の形態】従来技術の課題を解決するため
に、本発明者らは鋭意検討を重ね、次のような知見を得
た。図２にスキッドマーク付近の粗バー長手方向温度分
布を示す。粗バーの加熱を行う前の温度分布は細実線で
ある。従来技術では、スキッドマークが存在しないと仮
定した場合の点線の温度分布まで、粗バーの加熱を行つ
ている。しかしながら、スキッドマークによる板厚や板
幅の変動は、粗圧延によってすでに発生している。スキ
ッドマーク部では、粗バーの板厚はその他の部分に比較
して厚く、板幅は狭くなっている。被圧延材のスキッド
マーク部は変形抵抗が高いために、板厚方向に圧下され
にくく、幅広がりも小さいことが原因である。このた
め、従来技術の方法でスキッドマークを除去しても、粗
バーに存在した長手方向の形状変動は、熱延鋼帯にもそ
のまま残ることになる。BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the problems of the prior art, the present inventors have conducted extensive studies and obtained the following findings. FIG. 2 shows the temperature distribution in the longitudinal direction of the coarse bar near the skid mark. The temperature distribution before heating the coarse bar is a thin solid line. In the conventional technique, the coarse bar is heated up to the temperature distribution indicated by the dotted line when it is assumed that the skid mark does not exist. However, fluctuations in plate thickness and plate width due to skid marks have already occurred due to rough rolling. In the skid mark part, the plate thickness of the coarse bar is thicker than the other parts, and the plate width is narrow. This is because the skid mark portion of the material to be rolled has a high deformation resistance, so that it is difficult to be rolled down in the plate thickness direction and the width thereof is small. Therefore, even if the skid mark is removed by the method of the prior art, the shape change in the longitudinal direction that was present in the rough bar remains in the hot-rolled steel strip as it is.
【００１１】本発明の圧延方法では、粗バー加熱後の温
度分布が、図２の太実線で表されるように、スキッドマ
ーク部の温度がその他の部分よりも高くなっている。こ
のような温度分布を付与すれば、被圧延材のスキッドマ
ーク部の変形抵抗が下がり、仕上圧延中に他の部分より
も大きな板厚方向の圧下を加えられ、幅広がりも大きく
なる。かくして、粗圧延によって粗バーに発生した板
厚、板幅の長手方向の変動は、仕上圧延によって打ち消
され、長手方向に形状の安定した熱延鋼帯を製造するこ
とができる。In the rolling method of the present invention, the temperature distribution after heating the rough bar is such that the temperature of the skid mark portion is higher than that of other portions, as indicated by the thick solid line in FIG. By imparting such a temperature distribution, the deformation resistance of the skid mark portion of the material to be rolled is reduced, a greater reduction in the plate thickness direction than that of the other portions is applied during finish rolling, and the width spread becomes large. Thus, the variations in the plate thickness and the plate width in the longitudinal direction generated in the rough bar by the rough rolling are canceled by the finish rolling, and the hot rolled steel strip having a stable shape in the longitudinal direction can be manufactured.
【００１２】さらに、本発明者らは、スキッドマークに
起因した熱延鋼帯長手方向の形状変動をなるべく小さく
するためには、どのような加熱を行うべきかについて検
討を行った。その結果、粗圧延でスラブに加えられた板
厚方向の歪をεR 、仕上圧延で粗バーに加えられる板厚
方向の歪をεF とするとき、図２のΔＴ1 およびΔＴ2
が次式の関係を満たすように加熱すればよいということ
を見出した。Further, the present inventors have examined what kind of heating should be performed in order to minimize the shape variation in the longitudinal direction of the hot-rolled steel strip due to the skid marks. As a result, when the strain in the plate thickness direction applied to the slab in the rough rolling is ε R and the strain in the plate thickness direction applied to the rough bar in the finish rolling is ε F , ΔT 1 and ΔT 2 in FIG.
It was found that the heating should be performed so as to satisfy the relationship of
【００１３】ΔＴ2 ＝（εR ／εF ）・ΔＴ1
なお、図２では、ΔＴ1 とΔＴ2 が温度の極小と極大の
位置のみで定義されるように見えるが、実際にはスキッ
ドマーク部の任意の位置で定義される。ΔT 2 = (ε R / ε F ) ΔT 1 In FIG. 2, ΔT 1 and ΔT 2 seem to be defined only by the minimum and maximum temperature positions, but in reality, the skid mark Defined anywhere in the part.
【００１４】以上の知見に基づき、本発明者らは、粗バ
ーをソレノイド型誘導加熱装置で加熱する際、スラブ低
温部分の加熱後の温度がスラブ非低温部分の加熱後の温
度より高くなるように加熱制御するようにして、スキッ
ドマークに起因した熱延鋼帯長手方向の板厚や板幅の変
動を低減することが可能な熱延鋼帯の圧延方法を見出
し、本発明を完成させた。Based on the above findings, the inventors of the present invention ensured that the temperature after heating the low temperature portion of the slab was higher than the temperature after heating of the low temperature portion of the slab when the coarse bar was heated by the solenoid type induction heating device. The present invention has been completed by finding a method for rolling a hot-rolled steel strip capable of reducing fluctuations in the thickness and width of the hot-rolled steel strip in the longitudinal direction caused by skid marks by controlling the heating to .
【００１５】以下に本発明の実施の形態について説明す
る。本発明の圧延方法を実施する熱間圧延設備列の概略
側面図を図１に示す。スラブ加熱炉１で所定の温度に加
熱されたスラブは、粗圧延機２で粗圧延されて粗バーと
なる。粗バーは、さらに仕上圧延機７で仕上圧延されて
所定板厚の熱延鋼帯となる。加熱装置入側温度計３は、
粗バーのスキッドマークを検出するために設けられてい
る。ここで測定した粗バーの長手方向温度分布をもと
に、制御装置４は上述した長手方向温度分布を与えるよ
うに、粗バー加熱装置５を制御して粗バーを加熱する。
ここに示した熱間圧延設備列には、加熱装置出側温度計
６や、熱延鋼帯の形状を検出する板厚計８や板幅計９も
設置されている。Embodiments of the present invention will be described below. FIG. 1 shows a schematic side view of a row of hot rolling equipment for carrying out the rolling method of the present invention. The slab heated to a predetermined temperature in the slab heating furnace 1 is roughly rolled by the rough rolling mill 2 to form a rough bar. The rough bar is further finish-rolled by the finish rolling mill 7 to form a hot-rolled steel strip having a predetermined plate thickness. The thermometer 3 on the heating device entrance side
It is provided to detect skid marks on the coarse bar. Based on the temperature distribution in the longitudinal direction of the coarse bar measured here, the controller 4 controls the coarse bar heating device 5 to heat the coarse bar so as to give the above-mentioned temperature distribution in the longitudinal direction.
In the hot rolling equipment row shown here, a heating device outlet side thermometer 6, a strip thickness gauge 8 and a strip width gauge 9 for detecting the shape of the hot rolled steel strip are also installed.
【００１６】粗バー加熱装置５としては、制御応答性の
観点から、誘導加熱装置が考えられる。誘導加熱装置に
はトランスバース・フラックス型とソレノイド型の２種
類が知られている。しかしながら、トランスバース・フ
ラックス型には、インダクターの形状が複雑で大容量の
ものを作りにくく、高価であるということや、被加熱材
の幅端部が過加熱されるといった問題がある。さらに、
効率を比較すると、粗バー程度の板厚ではソレノイド型
のほうが高いことから、特にソレノイド型誘導加熱装置
を選択すべきである。As the rough bar heating device 5, an induction heating device can be considered from the viewpoint of control response. Two types of induction heating devices are known: a transverse flux type and a solenoid type. However, the transverse flux type has the problems that the shape of the inductor is complicated, it is difficult to make a large capacity one, it is expensive, and the width end of the material to be heated is overheated. further,
Comparing the efficiencies, a solenoid type induction heating device should be selected because the solenoid type has a higher plate thickness at a rough bar level.
【００１７】粗バー加熱装置５の圧延ライン方向の長さ
は、スキッドマーク部の長さよりも短くしなければなら
ない、実用的には１ｍ以下とすればよい。また、図１に
は、粗バー加熱装置５は１台しか表示されていないが、
複数台設置してもかまわない。The length of the rough bar heating device 5 in the rolling line direction should be shorter than the length of the skid mark portion, and may be practically 1 m or less. Although only one coarse bar heating device 5 is shown in FIG. 1,
You can install multiple units.
【００１８】ここでは、特にスキッドマークに限定して
本発明の実施形態について説明したが、スラブ加熱炉１
内でスラブの長手方向に発生した任意の温度変動に対し
て、本発明が適用できることはいうまでもない。以下に
本発明の実施例を挙げ、本発明の効果を立証する。Here, the embodiment of the present invention has been described by limiting to the skid mark, but the slab heating furnace 1
It goes without saying that the present invention can be applied to arbitrary temperature fluctuations that occur in the longitudinal direction of the slab. Examples of the present invention will be given below to prove the effects of the present invention.
【００１９】[0019]
【実施例】本発明を実施した熱間圧延設備列は、図１に
示すようなものであるが、粗バー加熱装置５として５０
００ｋＷ級のソレノイド型誘導加熱装置が２台備えられ
ている。EXAMPLE A hot rolling equipment train in which the present invention is carried out is as shown in FIG.
Two 00kW class solenoid type induction heating devices are provided.
【００２０】板厚２３５ｍｍ、幅１２００ｍｍ、長さ８
２００ｍｍの鋼スラブをスラブ加熱炉１で１２４０℃に
加熱した後、粗圧延を行って板厚３５ｍｍの粗バーとし
た。さらに粗バーを仕上圧延して、板厚２．６ｍｍ、幅
１，２００ｍｍの熱延鋼帯を製造した。Thickness 235 mm, width 1200 mm, length 8
A 200 mm steel slab was heated to 1240 ° C. in the slab heating furnace 1 and then rough-rolled to obtain a rough bar having a plate thickness of 35 mm. Further, the rough bar was finish-rolled to manufacture a hot rolled steel strip having a plate thickness of 2.6 mm and a width of 1,200 mm.
【００２１】図３に加熱装置出側温度計６で測定した粗
バーの長手方向温度分布を示す。細実線は粗バーの加熱
を行わなかった場合（比較例）で、５個所にスキッドマ
ークが存在している。スキッドマークの谷底と、スキッ
ドマーク以外の部分の温度差は約３０℃である。これは
つまり、スキッドマークの谷底ではΔＴ1 ＝３０℃とい
うことである。点線のグラフは、従来技術の方法にのっ
とって、スキッドマークの温度を均一化したものであ
る。太実線は本発明を実施した場合の温度分布である。
加熱制御は次のようにして行われた。粗圧延で板厚方向
に加えられた真歪は、εR ＝ｌｎ（２３５／３５）であ
る。仕上圧延で根厚方向に加えられた真歪は、εF ＝ｌ
ｎ（３５／２．６）である。粗バー加熱後のスキッドマ
ーク部の、スキッドマーク以外の部分との温度差ΔＴ2
が、
ΔＴ2 ＝（εR ／εF ）・ΔＴ1
で与えられるように、加熱制御を行った。スキッドマー
クの谷底であった部分についてみると、加熱後はスキッ
ドマーク以外の部分に比べて約２０℃高温になっている
ことがわかる。FIG. 3 shows the temperature distribution in the longitudinal direction of the rough bar measured by the thermometer 6 on the outlet side of the heating device. The thin solid line shows the case where the coarse bar is not heated (Comparative Example), and skid marks are present at five points. The temperature difference between the bottom of the skid mark and the portion other than the skid mark is about 30 ° C. This means that ΔT 1 = 30 ° C. at the valley bottom of the skid mark. The dotted line graph shows the temperature of the skid marks made uniform according to the method of the prior art. The thick solid line is the temperature distribution when the present invention is implemented.
The heating control was performed as follows. The true strain applied in the plate thickness direction by rough rolling is ε R = ln (235/35). The true strain applied in the root thickness direction by finish rolling is ε F = 1
n (35 / 2.6). Temperature difference ΔT 2 between the skid mark part after heating the rough bar and the part other than the skid mark part
Was controlled so that ΔT 2 = (ε R / ε F ) · ΔT 1 . As for the part that was the bottom of the skid mark, it can be seen that after heating, the temperature is about 20 ° C. higher than that of the part other than the skid mark.
【００２２】板厚計８で測定した、このときの熱延鋼帯
の板厚と目標板厚の差を図４に示す。粗バー加熱を行わ
なかったときは、スキッドマークの影響によって±３０
μｍの板厚変動が発生している。従来技術の方法で粗バ
ーを加熱し、スキッドマークを均一化したときの板厚の
変化を点線のグラフに示す。依然として±１０μｍ以上
の板厚変動が存在する。これは、粗バーの段階ですでに
生じていた変動が原因と考えられる。これらに対して、
本発明により粗バーを加熱したときの板厚変動は±１０
μｍ以下におさえられている。FIG. 4 shows the difference between the thickness of the hot-rolled steel strip and the target thickness measured by the thickness gauge 8. When coarse bar heating is not performed, it will be ± 30 due to the influence of skid marks.
A plate thickness variation of μm occurs. The change in plate thickness when the coarse bar is heated and the skid marks are made uniform by the conventional method is shown in a dotted line graph. There is still a plate thickness variation of ± 10 μm or more. This is probably due to the fluctuations already occurring at the coarse bar stage. Against these,
According to the present invention, the variation in plate thickness when the rough bar is heated is ± 10.
It is kept below μm.
【００２３】板幅計９で測定した熱延鋼帯の仕上板幅と
目標板幅の差を図５に示す。細実線のグラフで表されて
いるように、粗バーの加熱を行わなかったときは、３〜
６ｍｍの板幅変動がある。点線で示される従来技術を適
用したときの結果では３〜５ｍｍと、２ｍｍ程度のばら
つきがある。太実線の本発明のグラフをみると、仕上板
幅と目標板幅の差が約４ｍｍのところで安定しているこ
とがわかる。以上の実施例から、本発明の熱延鋼帯の圧
延方法により、熱延鋼帯長手方向の形状変動を従来技術
よりも低減できることがわかる。FIG. 5 shows the difference between the final strip width and the target strip width of the hot-rolled steel strip measured by the strip width meter 9. As shown by the thin solid line graph, when the coarse bar is not heated,
There is a plate width variation of 6 mm. The result of applying the conventional technique indicated by the dotted line is 3 to 5 mm, which is about 2 mm. It can be seen from the graph of the present invention indicated by the thick solid line that it is stable when the difference between the finish plate width and the target plate width is about 4 mm. From the above examples, it can be understood that the hot-rolled steel strip rolling method of the present invention can reduce the shape variation in the longitudinal direction of the hot-rolled steel strip as compared with the prior art.
【００２４】[0024]
【発明の効果】本発明の熱延鋼帯の圧延方法により、熱
延鋼帯の長手方向について板厚や板幅の変動を低減する
ことができ、歩留りが向上する。さらに、需要家の信頼
を得ることができるなど、工業上の利用価値は高い。According to the method for rolling a hot-rolled steel strip of the present invention, it is possible to reduce the variation of the sheet thickness and the sheet width in the longitudinal direction of the hot-rolled steel strip, which improves the yield. Furthermore, it has high industrial utility value, such as being able to earn the trust of customers.
【図１】本発明の実施の形態に係る熱間圧延設備列の概
略側面図。FIG. 1 is a schematic side view of a row of hot rolling equipment according to an embodiment of the present invention.
【図２】本発明の実施の形態に係るスキッドマーク付近
の温度分布を従来技術と本発明例で比較した図。FIG. 2 is a diagram comparing a temperature distribution near a skid mark according to an embodiment of the present invention between a conventional technique and an example of the present invention.
【図３】本発明の実施例に係る粗バー加熱装置出側温度
の分布を従来技術と本発明例で比較した図。FIG. 3 is a diagram comparing the temperature distribution on the outlet side of the coarse bar heating device according to the embodiment of the present invention between the prior art and the present invention example.
【図４】本発明の実施例に係る熱延鋼帯の仕上板厚と目
標板厚の差を従来技術と本発明例で比較した図。FIG. 4 is a diagram comparing a difference between a finish plate thickness and a target plate thickness of a hot-rolled steel strip according to an example of the present invention between a conventional technique and an example of the present invention.
【図５】本発明の実施例に係る熱延鋼帯の仕上板幅と目
標板幅の差を従来技術と本発明例で比較した図。FIG. 5 is a diagram comparing the difference between the finish strip width and the target strip width of the hot rolled steel strip according to the example of the present invention between the conventional technique and the example of the present invention.
【符号の説明】 １…スラブ加熱炉 ２…粗圧延磯 ３…加熱装置入側温度計 ４…制御装置 ５…粗バー加熱装置 ６…加熱装置出側温度計 ７…仕上圧延機 ８…板厚計 ９…板幅計[Explanation of symbols] 1 ... Slab heating furnace 2 ... Rough rolling beach 3 ... Thermometer on inlet side of heating device 4 ... Control device 5 ... Coarse bar heating device 6 ... Heating device outlet thermometer 7 ... Finishing mill 8 ... Plate thickness gauge 9 ... Board width gauge
───────────────────────────────────────────────────── フロントページの続き (72)発明者 本屋敷 洋一 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 (56)参考文献 特開 平10−118701（ＪＰ，Ａ) 特開 平10−27678（ＪＰ，Ａ) 特開 昭57−119492（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 1/26 B21B 45/00 C21D 9/00 101 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoichi Yashiki Yoichi Marunouchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (56) References 10-27678 (JP, A) JP-A-57-119492 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B21B 1/26 B21B 45/00 C21D 9/00 101
Claims (3)
粗圧延して粗バーとなし、粗バーを加熱装置で幅方向全
体にわたって加熱した後、粗バーを仕上圧延機で仕上圧
延して熱延鋼帯とする圧延方法において、 加熱炉内でスラブの長手方向に発生した温度変動のスラ
ブ低温部分に相当する粗バーの位置を、加熱装置で加熱
するにあたり、スラブ低温部分の加熱後の温度が、隣り
合ったスラブ非低温部分の加熱後の温度より高くなるよ
うにすることを特徴とする、熱延鋼帯の圧延方法。1. A slab heated in a heating furnace is roughly rolled by a rough rolling machine to form a rough bar, and the rough bar is heated by a heating device over the entire width direction, and then the rough bar is finish rolled by a finish rolling machine. In the rolling method for forming a hot rolled steel strip, the position of the rough bar corresponding to the low temperature slab portion of the temperature fluctuation generated in the longitudinal direction of the slab in the heating furnace is heated by the heating device. The method for rolling a hot-rolled steel strip is characterized in that the temperature of the hot rolled steel strip is set higher than the temperature of the adjacent non-low temperature slabs after heating.
粗バーの加熱装置がソレノイド型誘導加熱装置であるこ
とを特徴とする、請求項１に記載の熱延鋼帯の圧延方
法。2. The method for rolling a hot-rolled steel strip according to claim 1, wherein the heating device for the rough bar installed between the rough rolling mill and the finish rolling mill is a solenoid type induction heating device. .
とスラブ低温部分の粗バーの温度差をΔＴ1 、粗バーを
加熱した後のスラブ非低温部分とスラブ低温部分の粗バ
ーの温度差をΔＴ2 、粗圧延でスラブに加えられる板厚
方向の歪をεR 、仕上圧延で粗バーに加えられる板厚方
向の歪をεF と定義するとき、下記（１）式を満たすよ
うに粗バーを加熱することを特徴とする、請求項１また
は２に記載の熱延鋼帯の圧延方法。 ΔＴ2 ＝（εR ／εF ）・ΔＴ1 …（１）3. The temperature difference between the slab non-low temperature portion and the slab low temperature portion before heating the rough bar is ΔT 1 , and the temperature of the slab non-low temperature portion and slab low temperature portion after heating the rough bar. When the difference is defined as ΔT 2 , the strain in the plate thickness direction applied to the slab in rough rolling is defined as ε R , and the strain in the plate thickness direction added to the rough bar in finish rolling is defined as ε F , the following formula (1) should be satisfied. The method for rolling a hot-rolled steel strip according to claim 1 or 2, characterized in that the coarse bar is heated. ΔT 2 = (ε R / ε F ) · ΔT 1 (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23843398A JP3494025B2 (en) | 1998-08-25 | 1998-08-25 | Hot rolled steel strip rolling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23843398A JP3494025B2 (en) | 1998-08-25 | 1998-08-25 | Hot rolled steel strip rolling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000061503A JP2000061503A (en) | 2000-02-29 |
| JP3494025B2 true JP3494025B2 (en) | 2004-02-03 |
Family
ID=17030152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23843398A Expired - Fee Related JP3494025B2 (en) | 1998-08-25 | 1998-08-25 | Hot rolled steel strip rolling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3494025B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945776B2 (en) | 2002-07-25 | 2005-09-20 | Posco | Method and a skid member for reducing temperature difference in a heating subject and a skid apparatus using them |
-
1998
- 1998-08-25 JP JP23843398A patent/JP3494025B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000061503A (en) | 2000-02-29 |
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