JP2003048003A - Method for manufacturing hot-rolled steel sheet - Google Patents
Method for manufacturing hot-rolled steel sheetInfo
- Publication number
- JP2003048003A JP2003048003A JP2001232011A JP2001232011A JP2003048003A JP 2003048003 A JP2003048003 A JP 2003048003A JP 2001232011 A JP2001232011 A JP 2001232011A JP 2001232011 A JP2001232011 A JP 2001232011A JP 2003048003 A JP2003048003 A JP 2003048003A
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- Japan
- Prior art keywords
- cooling
- hot
- rolled
- rolled material
- width direction
- 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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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱延鋼板の製造方
法に関するものである。TECHNICAL FIELD The present invention relates to a method for manufacturing a hot rolled steel sheet.
【０００２】[0002]
【従来の技術】熱延鋼板の製造工程では、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し、次いで、この粗
バーを複数基の圧延スタンドからなる仕上圧延機におい
て仕上圧延して所定厚さの熱延鋼帯とし、この熱延鋼帯
をランナウトテーブル上の冷却装置において冷却した
後、コイラーで巻取ることにより熱延コイルが得られ
る。2. Description of the Related Art In the process of manufacturing a hot rolled steel sheet, a slab is heated to a predetermined temperature in a heating furnace, and the heated slab is rolled to a predetermined thickness by a rough rolling machine to form a coarse bar. A hot-rolled steel strip with a predetermined thickness is finish-rolled in a finishing rolling mill consisting of multiple rolling stands.The hot-rolled steel strip is cooled in a cooling device on the runout table and then rolled by a coiler. The coil is obtained.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このようにし
て製造される熱延鋼板は、鋼板幅方向の板厚分布に波形
様のバラツキを生じる傾向があり、長らくその原因が判
らず、適切な対策を講じることができなかった。However, the hot-rolled steel sheet produced in this manner tends to cause a wavy variation in the sheet thickness distribution in the sheet width direction, and its cause has not been clarified for a long time. I couldn't take any measures.
【０００４】したがって本発明の目的は、熱延鋼板の板
幅方向での波形様の板厚分布を解消し、板幅方向で均一
な板厚を有する熱延鋼板を製造することができる方法を
提供することにある。Therefore, an object of the present invention is to provide a method capable of eliminating a corrugated sheet thickness distribution in the sheet width direction of a hot rolled steel sheet and producing a hot rolled steel sheet having a uniform sheet thickness in the sheet width direction. To provide.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上述した
熱延鋼板の形状不良、すなわち板幅方向で波形様の板厚
分布を生じる原因と、その防止対策について検討を行っ
た。その結果、上記のような板幅方向で波形様の板厚分
布は冷却ムラが原因で発生していること、したがって、
熱延鋼板を板幅方向に均一冷却となるように冷却するこ
とにより解消できることを見出した。DISCLOSURE OF THE INVENTION The inventors of the present invention have investigated the cause of the above-mentioned defective shape of the hot-rolled steel sheet, that is, the corrugated sheet thickness distribution in the sheet width direction, and the preventive measures. As a result, the corrugated plate thickness distribution in the plate width direction as described above is caused by uneven cooling, therefore,
It has been found that this can be solved by cooling the hot-rolled steel sheet so that it is uniformly cooled in the sheet width direction.
【０００６】熱間仕上圧延機では、圧延ロールの肌荒れ
やスケール性欠陥の防止などを目的として、圧延ロール
直前に冷却装置を設けるのが一般的であり、この冷却装
置としては、図６に示すようなヘッダー管７ａに多数の
噴射ノズル７ｂが取付けられた装置が一般に用いられて
いる。本発明者等は、この冷却装置で冷却される熱延鋼
板表面の板幅方向での冷却能分布を調べた。その結果を
模式的に示すと図９のようになり、ノズル７ｂの直下で
最も冷却能が高く、隣り合ったノズルの間では冷却水が
干渉しあって冷却能が低くなる。このような板幅方向で
の冷却能の高低に応じて熱延鋼板表面には熱伝達率の分
布が生じており、図９において最高熱伝達率と最低熱伝
達率との差はΔｈとなる。その結果、噴射ノズル７ｂの
直下と、隣り合ったノズル７ｂとの間では、圧延材５の
冷却のされ方が異なって、噴射ノズル７ｂの直下のほう
がノズル７ｂの間よりも圧延材５の温度が下がり、変形
抵抗が高くなる。[0006] In the hot finish rolling mill, a cooling device is generally provided immediately before the rolling roll for the purpose of preventing the roughening of the rolling roll and scale defects, and this cooling device is shown in FIG. A device in which a large number of injection nozzles 7b are attached to such a header pipe 7a is generally used. The inventors investigated the cooling capacity distribution in the width direction of the surface of the hot rolled steel sheet cooled by this cooling device. The result is schematically shown in FIG. 9, and the cooling capacity is the highest just below the nozzle 7b, and the cooling water interferes between the adjacent nozzles, and the cooling capacity is low. A distribution of the heat transfer coefficient is generated on the surface of the hot-rolled steel sheet according to such a level of the cooling capacity in the plate width direction, and the difference between the maximum heat transfer coefficient and the minimum heat transfer coefficient is Δh in FIG. . As a result, the method of cooling the rolled material 5 is different between immediately below the injection nozzle 7b and the adjacent nozzles 7b, and the temperature of the rolled material 5 immediately below the injection nozzle 7b is higher than that between the nozzles 7b. And the deformation resistance increases.
【０００７】また、図７に示すような冷却装置７を用い
て熱間仕上圧延機ロールバイト直前で圧延材を冷却した
場合には、冷却水の一部が圧延ロール３に直接当たり、
圧延材冷却装置７のノズルの位置に対応して、圧延ロー
ル３の軸方向に図８に示したような波形の温度分布（温
度ムラ）が発生することが判った。そして、このような
温度分布に対応して発生した、圧延ロール３のヒートク
ラウンは、噴射ノズル７ｂの直下で凹状のクラウンとな
ることが判った。したがって、圧延材の変形抵抗の高い
部分は前記凹状のクラウン部分で圧延され、変形抵抗の
低い部分はそれ以外の部分で圧延され、その結果、仕上
板厚の幅方向分布は図８に示すように、噴射ノズル７ｂ
の配置に対応して波型になってしまうことが判った。When the rolled material is cooled immediately before the roll bite of the hot finish rolling mill using the cooling device 7 as shown in FIG. 7, a part of the cooling water directly hits the rolling roll 3,
It was found that a temperature distribution (temperature unevenness) having a waveform as shown in FIG. 8 is generated in the axial direction of the rolling roll 3 corresponding to the position of the nozzle of the rolled material cooling device 7. Then, it was found that the heat crown of the rolling roll 3 generated corresponding to such temperature distribution becomes a concave crown immediately below the injection nozzle 7b. Therefore, the portion with high deformation resistance of the rolled material is rolled with the concave crown portion, and the portion with low deformation resistance is rolled with other portions, and as a result, the distribution of the finished plate thickness in the width direction is as shown in FIG. The injection nozzle 7b
It turns out that it becomes wavy corresponding to the arrangement of.
【０００８】このような問題に対して、本発明者等はノ
ズルピッチが異なる種々の冷却装置を用い、冷却後の熱
延鋼板の板幅方向における温度分布と熱伝達率を調査し
た。With respect to such a problem, the present inventors investigated various temperature distributions and heat transfer coefficients in the width direction of the hot rolled steel sheet after cooling using various cooling devices having different nozzle pitches.
【０００９】本発明者等は、従来型の噴射ノズルを備え
た冷却装置（実験装置）（図６，７の冷却装置７参照）
を用い、ノズルピッチや流量を変えて、ノズル冷却水直
下と、隣り合ったノズルの間における熱伝達率を求める
実験を行った。熱電対を埋め込んだ鋼材を加熱したの
ち、熱電対のある場所がノズルの直下または隣り合った
ノズルの間を通過するように搬送して鋼材を冷却した。
このときの温度変化から逆算して、熱伝達率を算出し
た。次に、上記実験で用いたノズルおよびノズルヘッダ
ーと同一の型式で同一ノズルピッチのものを実機に取付
けて、ヘッダー圧（または水量密度）を同一にして、熱
間仕上圧延機ロールバイトの直前で圧延材の表面を冷却
してから圧延を行う、実機での圧延試験を繰り返した。
その結果、仕上板厚の板幅方向でのバラツキ(Δｔ)は、
実験で求めた圧延材の幅方向における最高熱伝達率と最
低熱伝達率との差(Δｈ)（図９参照）に依存しているこ
とが明らかになった。実験で求めた圧延材の幅方向にお
ける最高熱伝達率と最低熱伝達率との差Δｈを横軸、そ
れに対応した実機試験で求めた仕上板厚の板幅方向での
バラツキΔｔを縦軸にプロットしたのが図２である。こ
れにより、Δｈが２００kcal/m2/℃/hr以下であれば、
仕上板厚の板幅方向でのバラツキはほとんど発生しない
ことが判った。The present inventors have made a cooling device (experimental device) equipped with a conventional injection nozzle (see cooling device 7 in FIGS. 6 and 7).
An experiment was conducted to determine the heat transfer coefficient between the nozzles immediately below the nozzle cooling water and the adjacent nozzles by changing the nozzle pitch and flow rate. After heating the steel material in which the thermocouple was embedded, the steel material was cooled so that the place where the thermocouple was located passed directly under the nozzle or between adjacent nozzles.
The heat transfer coefficient was calculated by back-calculating from the temperature change at this time. Next, install the nozzles and nozzle headers of the same type and nozzle pitch used in the above experiment on the actual machine, make the header pressure (or water density) the same, and place just before the hot rolling mill roll bite. A rolling test in an actual machine, in which the surface of the rolled material was cooled and then rolled, was repeated.
As a result, the variation (Δt) of the finished plate thickness in the plate width direction is
It became clear that it depends on the difference (Δh) (see FIG. 9) between the maximum heat transfer coefficient and the minimum heat transfer coefficient in the width direction of the rolled material obtained by the experiment. The difference Δh between the maximum heat transfer coefficient and the minimum heat transfer coefficient in the width direction of the rolled material obtained by the experiment is shown on the horizontal axis, and the variation Δt in the width direction of the finished plate thickness obtained by the corresponding actual machine test is shown on the vertical axis. The plot is shown in FIG. As a result, if Δh is 200 kcal / m 2 / ° C / hr or less,
It was found that there is almost no variation in the finished plate thickness in the plate width direction.
【００１０】本発明はこのような知見に基づきなされた
もので、その特徴は以下の通りである。The present invention has been made on the basis of such findings, and its features are as follows.
【００１１】（１）熱間仕上圧延機ロールバイトの直前
で圧延材の表面を冷却してから圧延を行う熱延鋼板の製
造方法において、前記冷却を圧延材の幅方向における最
高熱伝達率と最低熱伝達率との差が２００kcal/m2/℃/h
r以下となるように実施することを特徴とする熱延鋼板
の製造方法。(1) In the method for producing a hot-rolled steel sheet in which the surface of the rolled material is cooled immediately before the roll bite of the hot finish rolling mill and then rolled, the cooling is performed with the maximum heat transfer coefficient in the width direction of the rolled material. The difference with the lowest heat transfer coefficient is 200 kcal / m 2 / ℃ / h
A method for manufacturing a hot-rolled steel sheet, which is carried out so as to be r or less.
【００１２】（２）熱間仕上圧延機ロールバイトの直前
での圧延材の冷却をスリットラミナーで行うことを特徴
とする上記（１）に記載の熱延鋼板の製造方法。(2) The method for producing a hot-rolled steel sheet according to (1), wherein the rolled material is cooled immediately before the roll bite of the hot finish rolling mill by a slit laminar.
【００１３】（３）熱間仕上圧延機ロールバイトの直前
での圧延材の冷却をミスト冷却で行うことを特徴とする
上記（１）に記載の熱延鋼板の製造方法。(3) The method for producing a hot-rolled steel sheet according to (1), wherein the rolled material is cooled immediately before the roll bite of the hot finish rolling mill by mist cooling.
【００１４】[0014]
【発明の実施の形態】図１は、本発明の実施に供すべ
き、熱間仕上圧延機のロールバイト直前で圧延材５を冷
却するための圧延材冷却装置１を示している。1 shows a rolling material cooling device 1 for cooling a rolling material 5 immediately before a roll bite of a hot finish rolling mill, which is to be used for carrying out the present invention.
【００１５】この圧延材冷却装置１は、圧延材５の幅方
向における最高熱伝達率と最低熱伝達率との差Δｈが２
００kcal/m2/℃/hr以下となるように圧延材を冷却する
ことができる冷却手段を有している。In this rolled material cooling device 1, the difference Δh between the maximum heat transfer coefficient and the minimum heat transfer coefficient in the width direction of the rolled material 5 is 2
It has a cooling means capable of cooling the rolled material so as to be not more than 00 kcal / m 2 / ° C / hr.
【００１６】このような冷却手段としては、例えばス
リットラミナーで冷却する手段、ミスト冷却で冷却す
る手段、ロール冷却で冷却する手段、過熱液体噴流
冷却で冷却する手段、強制風冷で冷却する手段などが
考えられる。As such cooling means, for example, means for cooling with a slit laminar, means for cooling with mist cooling, means for cooling with roll cooling, means for cooling with superheated liquid jet cooling, means for cooling with forced air cooling, etc. Can be considered.
【００１７】図１において、圧延ロール冷却装置２は圧
延ロール３を冷却するためのもので、この例では圧延ロ
ールに面してその軸方向に沿って配置されたヘッダーと
このヘッダーの長手方向に沿って適当な間隔で設けられ
る複数のノズルとから構成される。その他に、ロール冷
却水の水切りワイパー４、サイドガイドやストリッパー
ガイド、熱間潤滑装置（図示せず）などの、圧延ロール
３の前後で通常用いられている構成要素を本発明の実施
を妨げない範囲で併用することは、全く差し支えない。
ただし、ロール冷却水の水切りワイパー４は常に圧延材
５の板幅以上をカバーする幅を有することが必要であ
る。In FIG. 1, a rolling roll cooling device 2 is for cooling the rolling roll 3. In this example, a header arranged along the axial direction of the header facing the rolling roll and a longitudinal direction of the header. And a plurality of nozzles provided at appropriate intervals. In addition, components that are normally used before and after the rolling roll 3, such as a drainer wiper 4 for roll cooling water, a side guide, a stripper guide, and a hot lubrication device (not shown), do not hinder the implementation of the present invention. There is no problem in using them together within the range.
However, the drainer wiper 4 for the roll cooling water must always have a width that covers the plate width of the rolled material 5 or more.
【００１８】上記のスリットラミナー冷却手段を用い
る場合を図３に示す。図３は図１のＡ―Ａ線に沿う矢視
図である。この冷却手段は、熱間仕上圧延機のロールバ
イト直前位置において圧延材５の幅方向に沿って配置さ
れたヘッダー１ａとこのヘッダー１ａの長手方向に沿っ
て設けられた、スリットノズル１ｂから構成され、その
スリットノズル１ｂからスリットラミナー１ｃを噴出す
る。FIG. 3 shows the case where the above slit laminar cooling means is used. FIG. 3 is a view taken along the line AA of FIG. This cooling means is composed of a header 1a arranged along the width direction of the rolled material 5 immediately before the roll bite of the hot finish rolling mill, and a slit nozzle 1b provided along the longitudinal direction of the header 1a. The slit laminar 1c is ejected from the slit nozzle 1b.
【００１９】スリットノズルから吐出されるスリットラ
ミナー１ｃは元々圧延材５の幅方向に冷却能分布を持た
ないから、圧延材５や圧延ロール３の幅方向に、波型の
温度分布を生じることなく圧延材５を圧延することがで
きる。流体としては、水または温水が使われる。Since the slit laminar 1c discharged from the slit nozzle originally has no cooling capacity distribution in the width direction of the rolled material 5, there is no corrugated temperature distribution in the width direction of the rolled material 5 or the rolling rolls 3. The rolled material 5 can be rolled. Water or hot water is used as the fluid.
【００２０】上記のミスト冷却手段を用いる場合、ミ
スト冷却は、高速空気流とともに、水をノズルから噴射
して冷却する方法である。液滴を加速して冷却能力を高
める目的で空気を用いる場合と、液滴を極く微細化し、
あまり大きな運動量を与えず、冷却能力を微細制御する
目的で空気を用いる場合がある。後者はフォグ冷却と呼
ばれることもあるが、本発明のミスト冷却に含まれるも
のとする。ノズル間の干渉がほとんどないため、本発明
の冷却手段に適している。また、ミストをスリットから
噴出するスリットミストノズルといった技術も知られて
おり、本発明の冷却手段として用いることができる。When the above mist cooling means is used, mist cooling is a method in which water is jetted from a nozzle together with a high-speed air stream to cool it. When air is used for the purpose of accelerating the droplets to increase the cooling capacity, and when the droplets are extremely miniaturized,
Air may be used for the purpose of finely controlling the cooling capacity without giving a very large momentum. The latter is sometimes called fog cooling, but is included in the mist cooling of the present invention. Since there is almost no interference between nozzles, it is suitable for the cooling means of the present invention. A technique such as a slit mist nozzle that ejects mist from a slit is also known, and can be used as the cooling means of the present invention.
【００２１】上記のロール冷却手段を用いる場合を図
４および図５に示す。図４は側面図、図５は図４のＡ−
Ａ線に沿う矢視図である。The case of using the above roll cooling means is shown in FIGS. 4 is a side view, and FIG. 5 is A- of FIG.
It is an arrow view which follows the A line.
【００２２】熱間仕上圧延機のロールバイト直前で、圧
延材５に内部が水冷された水冷ロール６を押し付けるこ
とにより、圧延材５の表面を冷却するロール冷却を用い
た水冷ロール６を有する。Immediately before the roll bite of the hot finish rolling mill, there is provided a water-cooling roll 6 for cooling the surface of the rolled material 5 by pressing a water-cooled roll 6 whose interior is water-cooled onto the rolled material 5.
【００２３】図４および図５の冷却方法では、圧延材５
の幅方向に、冷却による特定の温度分布が発生しにく
い。圧延ロール３も水冷ロール６と接触していないた
め、従来技術のように幅方向に波型の温度分布が発生す
ることはない。圧延ロール冷却装置２、ロール冷却水の
水切りワイパー４等の実施形態は図１に示すものと同様
である。In the cooling method shown in FIGS. 4 and 5, the rolled material 5 is used.
A specific temperature distribution due to cooling is unlikely to occur in the width direction of. Since the rolling roll 3 is also not in contact with the water-cooling roll 6, a corrugated temperature distribution does not occur in the width direction unlike the conventional technique. Embodiments of the rolling roll cooling device 2, the roll cooling water draining wiper 4 and the like are the same as those shown in FIG.
【００２４】上記の過熱液体噴流冷却手段を用いる場
合、過熱液体噴流冷却は、廃熱から過熱水を製造し、こ
れを冷却に利用する方法である。過熱水をノズルから噴
出すると、突発的な減圧沸騰により、一部が自己蒸発し
て液体は微細化され、広範囲に広がる高速の蒸気液滴二
相流となる。この冷却方法は、高速の二相流を高温の圧
延材に衝突させ冷却を行うものである。空気を用いるミ
スト冷却に比べて動力の低減が図れると共に、広範囲な
噴射と、より均一な冷却が可能である。When the above-mentioned superheated liquid jet cooling means is used, the superheated liquid jet cooling is a method of producing superheated water from waste heat and utilizing it. When superheated water is ejected from the nozzle, a part of it self-evaporates due to sudden depressurization boiling, and the liquid is atomized to become a high-speed vapor droplet two-phase flow that spreads over a wide area. In this cooling method, a high-speed two-phase flow is collided with a hot rolled material for cooling. Compared with mist cooling using air, power can be reduced, wide-range injection and more uniform cooling are possible.
【００２５】上記の強制風冷手段を用いる場合、強制
風冷は、圧延材の表面に気体を噴射して冷却する方法で
ある。衝風冷却、強制空冷と呼ばれることもある。製鉄
工程で幅広く用いられている技術である。スリットノズ
ルから噴射すれば、圧延材を幅方向に均一に冷却するこ
とができる。吹き付ける気体としては、空気だけでな
く、窒素ガスなどの、スケール生成を抑制するガス種を
用いることもできる。When the above-mentioned forced air cooling means is used, forced air cooling is a method of injecting gas onto the surface of the rolled material to cool it. Sometimes called blast cooling or forced air cooling. This technology is widely used in the iron making process. By injecting from the slit nozzle, the rolled material can be uniformly cooled in the width direction. As the gas to be sprayed, not only air but also gas species such as nitrogen gas that suppress scale formation can be used.
【００２６】本発明では、以上に述べた〜までの冷
却方法を、任意に組み合わせて用いることができる。ま
た、圧延材５の幅方向に均一な冷却能分布を持っていれ
ば、どのような冷却装置も本発明に用いることは差し支
えない。In the present invention, the cooling methods up to the above can be used in any combination. Further, any cooling device can be used in the present invention as long as it has a uniform cooling capacity distribution in the width direction of the rolled material 5.
【００２７】本発明の熱間圧延方法では、熱間仕上圧延
機のロールバイト直前で圧延材５の表面の冷却を行った
際の圧延ロール３のヒートクラウンの発生を防止し、圧
延材５の板幅方向での仕上板厚を均一化する基本的な効
果があり、さらに熱間仕上圧延機のロールバイト直前で
圧延材５を冷却してその表面温度を下げるため圧延ロー
ル３の肌荒れが低減する。また、２次スケールの成長が
抑制され、デスケーリングの効果も加わってスケール性
欠陥が減少する。In the hot rolling method of the present invention, generation of a heat crown of the rolling roll 3 when the surface of the rolled material 5 is cooled immediately before the roll bite of the hot finish rolling mill is prevented, and It has a basic effect of making the finished plate thickness uniform in the plate width direction, and further reduces the surface roughness of the rolling roll 3 by cooling the rolled material 5 immediately before the roll bite of the hot finishing mill to lower the surface temperature. To do. Further, the growth of the secondary scale is suppressed, and the effect of descaling is added to reduce the scale defects.
【００２８】[0028]
【実施例】本発明を熱間仕上圧延機に適用した例につい
て述べる。本実施例の熱間仕上圧延機は圧延機７台から
なる仕上圧延機群を備え、板厚３０〜４０ｍｍの粗バー
を仕上圧延機で仕上圧延して、仕上圧延が１．２〜１０
ｍｍの熱延鋼鈑を製造している。仕上圧延機の１段目か
ら５段目のロールバイト直前に図６および図７に示すよ
うな圧延材冷却装置７を設置した。EXAMPLE An example in which the present invention is applied to a hot finish rolling mill will be described. The hot finish rolling mill of the present example is equipped with a finishing rolling mill group consisting of seven rolling mills, and a rough bar having a plate thickness of 30 to 40 mm is finish rolled by the finishing rolling mill to give a finish rolling of 1.2 to 10.
mm hot rolled steel sheet is manufactured. The rolled material cooling device 7 as shown in FIGS. 6 and 7 was installed immediately before the first to fifth roll bites of the finish rolling mill.
【００２９】この設備で圧延を行ったところ、圧延材冷
却装置７のノズル７ｂの配置に対応して、圧延材板幅方
向の仕上板厚が波形になった。ここで、圧延材冷却装置
７のノズル７ｂの幅方向ノズル配置ピッチは１３０ｍ
ｍ、ノズル数は１５である。仕上板厚が３ｍｍの熱延鋼
板の場合、仕上板厚の板幅方向でのバラツキは、最大で
１５μｍにも達した。When rolling was carried out with this equipment, the finished plate thickness in the width direction of the rolled material became corrugated in correspondence with the arrangement of the nozzles 7b of the rolled material cooling device 7. Here, the width direction nozzle arrangement pitch of the nozzles 7b of the rolled material cooling device 7 is 130 m.
m and the number of nozzles is 15. In the case of a hot-rolled steel sheet having a finished sheet thickness of 3 mm, the variation in the finished sheet thickness in the sheet width direction reached 15 μm at the maximum.
【００３０】そこで、図１および図３に示すように、ス
リットラミナーで圧延材を冷却するようにしたところ、
熱延鋼板板幅方向の仕上板厚から波形のパターンが消滅
した。Therefore, as shown in FIGS. 1 and 3, when the rolled material is cooled by a slit laminar,
The corrugated pattern disappeared from the finished plate thickness in the width direction of the hot rolled steel plate.
【００３１】[0031]
【発明の効果】本発明を適用すれば、圧延材の表面を熱
間仕上圧延機ロールバイトの直前で、圧延材の幅方向に
均一に冷却することにより、圧延ロールの肌荒れやスケ
ール性欠陥を低減できるだけでなく、圧延材の板幅方向
での仕上板厚を均一化することができる。EFFECTS OF THE INVENTION According to the present invention, the surface of a rolled material is cooled in the width direction of the rolled material evenly just before the roll bite of the hot finish rolling mill, so that the surface roughness and scale defects of the rolled material can be prevented. Not only can it be reduced, but the finished plate thickness in the plate width direction of the rolled material can be made uniform.
【図１】本発明の実施に供すべき、熱間仕上圧延機のロ
ールバイト直前で圧延材を冷却するための圧延材冷却装
置を示す側面図FIG. 1 is a side view showing a rolled material cooling device for cooling rolled material just before a roll bite of a hot finish rolling mill to be used for carrying out the present invention.
【図２】仕上板厚の板幅方向でのバラツキ(Δｔ)と、圧
延材の幅方向における最高熱伝達率と最低熱伝達率との
差(Δｈ)との関係の一例を示すグラフFIG. 2 is a graph showing an example of the relationship between the variation (Δt) of the finished plate thickness in the plate width direction and the difference (Δh) between the maximum heat transfer coefficient and the minimum heat transfer coefficient in the width direction of the rolled material.
【図３】本発明のスリットラミナー冷却手段を用いる場
合の図１のＡ―Ａ線に沿う矢視図FIG. 3 is a view taken along the line AA of FIG. 1 when the slit laminar cooling means of the present invention is used.
【図４】本発明のロール冷却手段による圧延材冷却装置
を示す側面図FIG. 4 is a side view showing a rolled material cooling device by roll cooling means of the present invention.
【図５】図４のＡ−Ａ線に沿う矢視図5 is an arrow view taken along the line AA of FIG.
【図６】一般的な冷却装置を示す側面図FIG. 6 is a side view showing a general cooling device.
【図７】従来技術の熱間仕上圧延機のロールバイト直前
で圧延材を冷却するための圧延材冷却装置を示す側面図FIG. 7 is a side view showing a rolled material cooling device for cooling a rolled material just before a roll bite of a hot finish rolling mill according to the prior art.
【図８】圧延材の冷却で発生する圧延ロールの軸方向温
度分布と圧延材の板幅方向の仕上板厚分布を示す図FIG. 8 is a diagram showing a temperature distribution in the axial direction of a rolling roll and a finished plate thickness distribution in the plate width direction of the rolled material, which are generated by cooling the rolled material
【図９】一般的な冷却装置で発生する熱伝達率（冷却
能）の分布を示す図FIG. 9 is a diagram showing a distribution of heat transfer coefficient (cooling capacity) generated in a general cooling device.
１ 圧延材冷却装置 １ａ 圧延材冷却ヘッダー １ｂ 圧延材冷却ノズル １ｃ スリットラミナー ２ 圧延ロール冷却装置 ３ 圧延ロール ４ 水切りワイパー ５ 圧延材 ６ 水冷ロール ７ 圧延材冷却装置 ７ａ 圧延材冷却ヘッダー ７ｂ 圧延材冷却ノズル 1 Rolled material cooling device 1a Rolled material cooling header 1b Rolling material cooling nozzle 1c slit laminar 2 Rolling roll cooling device 3 rolling rolls 4 Drainer wiper 5 rolled material 6 water-cooled roll 7 Rolled material cooling device 7a Rolled material cooling header 7b Rolling material cooling nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 堤 康一 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 Ｆターム(参考） 4E002 AD04 BD07 CA02 CA08 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Koichi Tsutsumi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. F-term (reference) 4E002 AD04 BD07 CA02 CA08
Claims (3)
延材の表面を冷却してから圧延を行う熱延鋼板の製造方
法において、前記冷却を圧延材の幅方向における最高熱
伝達率と最低熱伝達率との差が２００kcal/m2/℃/hr以
下となるように実施することを特徴とする熱延鋼板の製
造方法。1. A method for producing a hot-rolled steel sheet in which a surface of a rolled material is cooled immediately before a roll bite of a hot finish rolling mill and then rolled, in which the cooling is performed with a maximum heat transfer coefficient and a minimum heat transfer coefficient in a width direction of the rolled material. A method for producing a hot-rolled steel sheet, which is performed so that the difference from the heat transfer coefficient is 200 kcal / m 2 / ° C / hr or less.
圧延材の冷却をスリットラミナーで行うことを特徴とす
る請求項１に記載の熱延鋼板の製造方法。2. The method for producing a hot-rolled steel sheet according to claim 1, wherein the rolled material is cooled immediately before the roll bite of the hot finish rolling mill by a slit laminar.
圧延材の冷却をミスト冷却で行うことを特徴とする請求
項１に記載の熱延鋼板の製造方法。3. The method for producing a hot rolled steel sheet according to claim 1, wherein the rolled material is cooled immediately before the roll bite of the hot finish rolling mill by mist cooling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001232011A JP4586314B2 (en) | 2001-07-31 | 2001-07-31 | Manufacturing method of hot-rolled steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001232011A JP4586314B2 (en) | 2001-07-31 | 2001-07-31 | Manufacturing method of hot-rolled steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003048003A true JP2003048003A (en) | 2003-02-18 |
| JP4586314B2 JP4586314B2 (en) | 2010-11-24 |
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ID=19063990
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001232011A Expired - Fee Related JP4586314B2 (en) | 2001-07-31 | 2001-07-31 | Manufacturing method of hot-rolled steel sheet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014087520A1 (en) | 2012-12-06 | 2014-06-12 | 新日鐵住金株式会社 | Device for cooling hot-rolled steel sheet |
| WO2014087516A1 (en) | 2012-12-06 | 2014-06-12 | 新日鐵住金株式会社 | Method for producing steel sheet |
| WO2014087524A1 (en) | 2012-12-06 | 2014-06-12 | 新日鐵住金株式会社 | Method for cooling hot-rolled steel sheet |
| US9186710B2 (en) | 2011-06-07 | 2015-11-17 | Nippon Steel & Sumitomo Metal Corporation | Method for cooling hot-rolled steel sheet |
| US9211574B2 (en) | 2011-07-27 | 2015-12-15 | Nippon Steel & Sumitomo Metal Corporation | Method for manufacturing steel sheet |
| US9566625B2 (en) | 2011-06-07 | 2017-02-14 | Nippon Steel & Sumitomo Metal Corporation | Apparatus for cooling hot-rolled steel sheet |
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| JPH06210339A (en) * | 1993-01-12 | 1994-08-02 | Sumitomo Metal Ind Ltd | Cooling device for high temperature steel sheet |
| JPH06238320A (en) * | 1993-02-18 | 1994-08-30 | Kawasaki Steel Corp | Spray cooling method |
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2001
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|---|---|---|---|---|
| JPS5462151A (en) * | 1977-10-28 | 1979-05-18 | Kawasaki Steel Co | Temperature equalizing method of steel plate during rolling |
| JPH06210339A (en) * | 1993-01-12 | 1994-08-02 | Sumitomo Metal Ind Ltd | Cooling device for high temperature steel sheet |
| JPH06238320A (en) * | 1993-02-18 | 1994-08-30 | Kawasaki Steel Corp | Spray cooling method |
| JPH1071412A (en) * | 1996-04-08 | 1998-03-17 | Nippon Steel Corp | Method for controlling temperature or rolled stock in continuous hot rolling and cotinuous hot rolling equipment |
| JPH10156414A (en) * | 1996-11-29 | 1998-06-16 | Kawasaki Steel Corp | Method for jetting rolling oil in hot rolling of steel strip |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9186710B2 (en) | 2011-06-07 | 2015-11-17 | Nippon Steel & Sumitomo Metal Corporation | Method for cooling hot-rolled steel sheet |
| US9566625B2 (en) | 2011-06-07 | 2017-02-14 | Nippon Steel & Sumitomo Metal Corporation | Apparatus for cooling hot-rolled steel sheet |
| US9211574B2 (en) | 2011-07-27 | 2015-12-15 | Nippon Steel & Sumitomo Metal Corporation | Method for manufacturing steel sheet |
| WO2014087520A1 (en) | 2012-12-06 | 2014-06-12 | 新日鐵住金株式会社 | Device for cooling hot-rolled steel sheet |
| WO2014087516A1 (en) | 2012-12-06 | 2014-06-12 | 新日鐵住金株式会社 | Method for producing steel sheet |
| WO2014087524A1 (en) | 2012-12-06 | 2014-06-12 | 新日鐵住金株式会社 | Method for cooling hot-rolled steel sheet |
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|---|---|
| JP4586314B2 (en) | 2010-11-24 |
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