JPH06190419A - Method for cooling strip - Google Patents
Method for cooling stripInfo
- Publication number
- JPH06190419A JPH06190419A JP4344207A JP34420792A JPH06190419A JP H06190419 A JPH06190419 A JP H06190419A JP 4344207 A JP4344207 A JP 4344207A JP 34420792 A JP34420792 A JP 34420792A JP H06190419 A JPH06190419 A JP H06190419A
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- zone
- temperature
- stop temperature
- flow rate
- 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.)
- Withdrawn
Links
Landscapes
- Control Of Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ストリップの冷却方法
に関する。FIELD OF THE INVENTION The present invention relates to a method for cooling a strip.
【０００２】[0002]
【従来の技術】熱間圧延における仕上げ圧延終了後、コ
イル巻取り装置までの間には、一般に上下にスプレイ方
式もしくはパイプラミナー方式のストリップ冷却装置が
設けられ、巻取り温度の制御が行われる。この巻取り温
度制御は、熱延製品の材質上の特性を大きく左右するも
のであって、従来コイル巻取りまでにフェライト変態を
終了させることが主目的であったが、近年ではこれのみ
ならず、冷却によって材質を造り込むことが盛んに提唱
されている。すなわち、ＤＰ鋼、ＴＲＩＰ鋼の製造や、
ランアウトテーブル上での急冷却によりハイテン鋼の合
金成分削減、ＡＰＩ素材のホット圧延、また高炭特殊鋼
で従来変態開始が遅いとされてきた鋼種の、巻取りまで
の変態の促進等、ランアウトテーブル冷却に課せられた
課題は枚挙に暇なく、その冷却停止温度精度について
も、全長全幅で±３０℃以内、幅方向中央部精度で±１
０℃以内等、要求が厳格化しているのが実情である。2. Description of the Related Art A strip cooling device of a spray type or a pipe laminar type is generally provided between the coil winding device and the coil winding device after finishing rolling in hot rolling to control the winding temperature. This coiling temperature control greatly affects the material properties of the hot rolled product, and the conventional purpose was to finish the ferrite transformation before coiling, but in recent years not only this It has been actively advocated to build materials by cooling. That is, manufacturing of DP steel and TRIP steel,
Run-out table such as reduction of alloy components of high-tensile steel by rapid cooling on the run-out table, hot rolling of API materials, and promotion of transformation of steel types that have been considered to be slow to start transformation in high-carbon special steel until winding up. The problems that were imposed on cooling were numerous, and the cooling stop temperature accuracy was within ± 30 ° C for the entire width and ± 1 for the widthwise central part.
The reality is that the requirements are becoming stricter, such as within 0 ° C.
【０００３】しかし、冷却停止温度精度の厳格化に対し
て、既設のホットストリップミルが容易に対応し得ない
のは、以下のような理由による。既設のホットストリッ
プミルでは、巻取り温度の冷却設備の設計は従来のフェ
ライト変態を終了させることを主目的に能力が決められ
ており、厚物においてその冷却可能速度が、仕上ミル圧
延速度もしくは加熱炉の能力とアンバランスを引き起こ
さないように設計されているのが通常である。これゆ
え、生産能力が概ね等しいミルで比較した場合、巻取り
温度の冷却設備を短くし、コンパクトな設計を行ったミ
ルほど、巻取り温度の冷却設備の単位長さ当たりの冷却
能力すなわち、冷却水量密度は大きいのが実情である。However, the existing hot strip mill cannot easily cope with the strictness of the cooling stop temperature accuracy for the following reason. In the existing hot strip mill, the capacity of the cooling equipment for the coiling temperature is designed mainly for the purpose of ending the conventional ferrite transformation, and the cooling speed of the thick material depends on the finishing mill rolling speed or the heating speed. It is usually designed so that it does not create an imbalance with the capacity of the furnace. Therefore, when comparing mills that have approximately the same production capacity, the shorter the cooling equipment for the winding temperature and the more compact the mill, the cooling capacity per unit length of the cooling equipment for the winding temperature, that is, the cooling capacity. In reality, the water density is large.
【０００４】冷却ヘッダピツチを等しいとすれば、すな
わちテーブルローラピツチが等しい場合、巻取り温度の
冷却設備の単位長さ当たりの冷却能力が大きいことは、
冷却のインクリメントが大きいことを意味する。つま
り、巻取り温度の精度が悪いということである。図２に
冷却可能最大幅当たり体積速度（厚みｍｍ×圧延速度ｍ
ｐｍ，以下ＨＶと記す）を３０００とし、ヘッダピツチ
すなわちテーブルローラピツチを４００ｍｍとしたとき
の１ヘッダ当たりの冷却能力を示す。If the cooling header pitches are equal, that is, if the table roller pitches are equal, the cooling capacity per unit length of the cooling equipment at the winding temperature is large.
This means that the cooling increment is large. That is, the accuracy of the winding temperature is poor. Fig. 2 shows the volume speed per maximum width that can be cooled (thickness mm x rolling speed m
pm, hereinafter referred to as HV) is 3000 and the header pitch, that is, the table roller pitch is 400 mm, shows the cooling capacity per header.
【０００５】この図から明らかなように、冷却ゾーン長
（ランアウトテーブル長）を１４０ｍ有しているミル
（現在国内でも数基しかない）ですら、１ヘッダに１個
のバルブをつけた制御を行ったとしても、なお薄物材の
スレッデイング時に相当する低体積速度（ＨＶ８００）
の領域では冷却インクリメントが３℃程度となる。実際
にはどのミルにおいても、多数のバルブのメンテナンス
困難を伴う問題、バルブのオン／オフ応答性のばらつき
の問題、また計算機制御の負荷軽減等の問題から、せい
ぜい２ヘッダに１個のバルブの制御を行っている程度で
ある。従って、この精度は倍以上に悪化する。つまり、
薄物のスレッデイングのような低ＨＶ領域では、冷却イ
ンクリメントが５℃以上となってしまうことは、以上述
べた諸般の事情から避け難いことであり、これが既設ミ
ルでの冷却停止温度の高精度化を阻む大きな要因の一つ
となっているのである。As is clear from this figure, even with a mill having a cooling zone length (runout table length) of 140 m (currently, there are only a few bases in Japan), it is possible to control one header with one valve. Even if it is done, it still has a low volume velocity (HV800) equivalent to the threading of thin materials.
In the region of 3, the cooling increment is about 3 ° C. Actually, in every mill, due to problems such as maintenance of many valves being difficult, problems of valve on / off responsiveness variations, and load reduction of computer control, at most 2 valves per header It is only about controlling. Therefore, this accuracy is more than doubled. That is,
In the low HV range such as threading of thin materials, it is unavoidable that the cooling increment becomes 5 ° C or more because of the various reasons described above, and this is to improve the accuracy of the cooling stop temperature in the existing mill. It is one of the major factors that prevent
【０００６】[0006]
【発明が解決しようとする課題】本発明では、以上に述
べたような低ＨＶ領域での冷却停止温度精度向上を、簡
易なる設備構成で容易に達成し得る方法を提供するもの
である。DISCLOSURE OF THE INVENTION The present invention provides a method capable of easily achieving the above-mentioned accuracy improvement of the cooling stop temperature in the low HV region with a simple equipment configuration.
【０００７】[0007]
【課題を解決するための手段】本発明の提案する方法
は、図１に示すように、仕上ミル１と巻取装置２との間
に設けられた冷却設備の後半部分に設けられて最終的な
鋼板冷却停止温度の調整に使用される最終冷却ゾーン
（バーニアバンク）３に、１ヘッダ当たり１個のオン／
オフバルブ６を設置する精密な制御方法を採用し、更に
巻取り温度の冷却水を各冷却ヘッダに供給している本管
５から、冷却ゾーンへ至る分岐管の途中に流量調整バル
ブ４を設け、特に高精度の冷却停止温度が要求される鋼
種を、スレッディング時のように低いＨＶで圧延する場
合には、冷却ゾーンの流量調整バルブ４を絞ることによ
り、冷却ゾーンの冷却インクリメントを低くし、冷却停
止温度精度の高精度化を達成する。As shown in FIG. 1, the method proposed by the present invention is finally provided in the latter half of the cooling equipment provided between the finishing mill 1 and the winding device 2. In the final cooling zone (Vernier bank) 3 used to adjust the cooling stop temperature of various steel plates, 1 on / per header
A precise control method of installing the off valve 6 is adopted, and further, a flow rate adjusting valve 4 is provided in the middle of the branch pipe from the main pipe 5 supplying the cooling water of the winding temperature to each cooling header to the cooling zone. In particular, when rolling a steel type that requires a highly accurate cooling stop temperature at a low HV as in threading, the flow rate adjusting valve 4 in the cooling zone is throttled to reduce the cooling increment of the cooling zone, Achieve higher stop temperature accuracy.
【０００８】[0008]
【作用】本発明の提案する方法においては、冷却停止温
度の高精度要求材に対し、前述した最終冷却ゾーン（バ
ーニアバンク）３で流量調整を行い、冷却設備の低流量
密度化ならびに低熱流速化を行うことにより、冷却ゾー
ンにおける冷却インクリメントを２℃以下に調整し、そ
のゾーンで有効に冷却停止温度の制御を行う。これによ
って、従来にない高い冷却停止温度精度±２℃を達成す
ることができる。In the method proposed by the present invention, the flow rate is adjusted in the final cooling zone (vernier bank) 3 for a material requiring a high cooling stop temperature to reduce the flow density and heat flow rate of the cooling equipment. By doing so, the cooling increment in the cooling zone is adjusted to 2 ° C. or less, and the cooling stop temperature is effectively controlled in that zone. This makes it possible to achieve an unprecedentedly high cooling stop temperature accuracy of ± 2 ° C.
【０００９】[0009]
【実施例】本発明による方法により、低ＨＶ領域（８０
０ｍｍ・ｍｐｍ）で図１に示す流量調整バルブ４の開度
を変更した場合の、１ヘッダ当たりの冷却インクリメン
トを図３に示す。流量調整バルブ開度４０％にて、２℃
の冷却インクリメントが得られることが判った。EXAMPLE A low HV region (80
FIG. 3 shows the cooling increment per header when the opening degree of the flow rate adjusting valve 4 shown in FIG. 1 is changed to 0 mm · mpm). Flow rate adjustment valve opening 40%, 2 ℃
It was found that a cooling increment of
【００１０】そこで、実際に薄物のスレッデイング時
に、流量調整バルブ４の開度を４０％に設定して冷却制
御を行ったところ、冷却停止温度精度が±２℃以内とな
り、図５に示すように、冷却停止温度の精度は従来法に
比べ約１／３の高精度化を達成することができた。な
お、図１ではバルブ１個の開度を変更する場合を示した
が、バルブを複数設けて各々開度を変えておき、バルブ
切換によって流量調整してもよい。Therefore, when the cooling control is performed by setting the opening of the flow rate adjusting valve 4 to 40% when actually threading a thin object, the cooling stop temperature accuracy is within ± 2 ° C., as shown in FIG. In addition, the accuracy of the cooling stop temperature can be improved to about 1/3 that of the conventional method. Although FIG. 1 shows the case where the opening of one valve is changed, a plurality of valves may be provided and the opening may be changed, and the flow rate may be adjusted by switching the valves.
【００１１】[0011]
【発明の効果】本発明によれば、従来±６℃程度の冷却
停止温度精度が±２℃以内に制御することが可能となっ
た。According to the present invention, the accuracy of the cooling stop temperature of about ± 6 ° C can be controlled within ± 2 ° C.
【図１】本発明の構成を示す概念図である。FIG. 1 is a conceptual diagram showing a configuration of the present invention.
【図２】ランアウトテーブル（ＲＯＴ）長をパラメータ
としたＨＶと１ヘッダ当たり冷却能力の関係を示す図で
ある。FIG. 2 is a diagram showing a relationship between an HV and a cooling capacity per header using a runout table (ROT) length as a parameter.
【図３】流量調整バルブ開度と１ヘッダ当たりの冷却イ
ンクリメントの関係を示す図である。FIG. 3 is a diagram showing a relationship between a flow control valve opening and a cooling increment per header.
【図４】従来法と本法の冷却停止温度精度の比較を表わ
す図である。FIG. 4 is a diagram showing a comparison of cooling stop temperature accuracy between the conventional method and the present method.
１ 仕上げミル ２ 巻取装置 ３ 最終冷却ゾーン（バーニアバンク） ４ 流量調整バルブ ５ 冷却水本管 ６ オン／オフバルブ 1 Finishing Mill 2 Winding Device 3 Final Cooling Zone (Vernier Bank) 4 Flow Control Valve 5 Cooling Water Main 6 On / Off Valve
Claims (1)
巻取り温度に水冷冷却する工程において、低体積速度操
業時に材料を冷却停止温度に制御する最終冷却ゾーンの
流量密度を低くして制御し、冷却停止温度精度を向上す
ることを特徴とするストリップの冷却方法。1. In a step of water-cooling a strip after hot finish rolling to a target coiling temperature, the flow density in a final cooling zone for controlling a material to a cooling stop temperature during low volume speed operation is controlled by lowering the flow density. A method for cooling a strip, characterized in that the accuracy of cooling stop temperature is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4344207A JPH06190419A (en) | 1992-12-24 | 1992-12-24 | Method for cooling strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4344207A JPH06190419A (en) | 1992-12-24 | 1992-12-24 | Method for cooling strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06190419A true JPH06190419A (en) | 1994-07-12 |
Family
ID=18367462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4344207A Withdrawn JPH06190419A (en) | 1992-12-24 | 1992-12-24 | Method for cooling strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06190419A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2116313A1 (en) * | 2007-02-26 | 2009-11-11 | JFE Steel Corporation | Device and method for cooling hot-rolled steel strip |
| CN103866108A (en) * | 2012-12-10 | 2014-06-18 | 宝山钢铁股份有限公司 | Method for controlling thick plate quenching machine |
| CN106269905A (en) * | 2015-05-20 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of control method solving hot-rolling high-strength steel intensive cooling zone discount steel scrap |
| EP1633894B1 (en) | 2003-06-18 | 2017-04-26 | SMS group GmbH | Method and installation for the production of hot-rolled strip having a dual-phase structure |
| CN111215456A (en) * | 2018-11-23 | 2020-06-02 | 宝山钢铁股份有限公司 | Method for controlling threading stability of strip steel in hot-rolling laminar cooling area |
-
1992
- 1992-12-24 JP JP4344207A patent/JPH06190419A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1633894B1 (en) | 2003-06-18 | 2017-04-26 | SMS group GmbH | Method and installation for the production of hot-rolled strip having a dual-phase structure |
| EP2116313A1 (en) * | 2007-02-26 | 2009-11-11 | JFE Steel Corporation | Device and method for cooling hot-rolled steel strip |
| KR100976758B1 (en) * | 2007-02-26 | 2010-08-18 | 제이에프이 스틸 가부시키가이샤 | Device and method for cooling hot-rolled steel strip |
| EP2116313A4 (en) * | 2007-02-26 | 2013-04-17 | Jfe Steel Corp | Device and method for cooling hot-rolled steel strip |
| CN103866108A (en) * | 2012-12-10 | 2014-06-18 | 宝山钢铁股份有限公司 | Method for controlling thick plate quenching machine |
| CN106269905A (en) * | 2015-05-20 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of control method solving hot-rolling high-strength steel intensive cooling zone discount steel scrap |
| CN111215456A (en) * | 2018-11-23 | 2020-06-02 | 宝山钢铁股份有限公司 | Method for controlling threading stability of strip steel in hot-rolling laminar cooling area |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000307 |