JPH0657339A - Method for cooling hot rolled steel - Google Patents

Method for cooling hot rolled steel

Info

Publication number
JPH0657339A
JPH0657339A JP4215147A JP21514792A JPH0657339A JP H0657339 A JPH0657339 A JP H0657339A JP 4215147 A JP4215147 A JP 4215147A JP 21514792 A JP21514792 A JP 21514792A JP H0657339 A JPH0657339 A JP H0657339A
Authority
JP
Japan
Prior art keywords
cooling
rolled steel
temperature
hot rolled
thermometer
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.)
Pending
Application number
JP4215147A
Other languages
Japanese (ja)
Inventor
Nobuhiro Ito
伸宏 伊藤
Toshisada Takechi
敏貞 武智
Ichiro Maeda
一郎 前田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP4215147A priority Critical patent/JPH0657339A/en
Publication of JPH0657339A publication Critical patent/JPH0657339A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Heat Treatment Processes (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

PURPOSE:To provide the method for cooling hot rolled steel by which hot rolled steel is cooled in a metallurgically preferable cooling pattern. CONSTITUTION:Cooling control is executed respectively by a controller 28 in such a manner that, as for 1.2mm material, it is based on the measured result with an intermediate thermometer 20, as for 6.0mm material, it is based on that with an intermediate thermometer 22 and, as for 24.0mm material, it is based on that with an intermediate thermometer 24, so that the measured temps. are regulated to the ones found from a metallurgically preferable cooling pattern. As a result, the temp. precision (within + or -10 deg.C) at the time of the cooling control is improved to 95% compared to the case in which that executed by using a thermometer 26 arranged before the conventional coiling device is 85%.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、熱間圧延鋼材の冷却方
法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling hot rolled steel.

【0002】[0002]

【従来の技術】一般に、ホットストリップミルの熱間圧
延鋼材の冷却制御は、巻取装置の直前に設けられた温度
計により測定された温度に基づいて、この温度が所定温
度になるように行なわれている(鉄鋼便覧圧延基礎・鋼
板 P427参照)。また、この冷却制御を仕上ミル出
側温度計と巻取前温度計とを用いて測温することにより
行う方法も知られている。ところが、仕上ミル出側温度
計、冷却スプレ及び巻取り前温度計をそれぞれ配置した
位置が離れているため、これらの温度計の測定結果に基
づく冷却制御では、温度測定時刻と温度測定された鋼材
が冷却された時刻との時間差が大きく、冷却された鋼材
を所定温度にするための適切な冷却制御が行えないとい
う問題がある。
2. Description of the Related Art Generally, cooling control of hot rolled steel material of a hot strip mill is carried out based on a temperature measured by a thermometer provided immediately before a winding device so that this temperature becomes a predetermined temperature. (See Iron and Steel Handbook Rolling Foundation / Steel Plate P427). There is also known a method in which this cooling control is performed by measuring the temperature using a finishing mill outlet side thermometer and a pre-winding thermometer. However, since the positions where the finishing mill exit side thermometer, the cooling spray, and the pre-winding thermometer are arranged are distant from each other, in the cooling control based on the measurement results of these thermometers, the temperature measurement time and the temperature of the steel material measured were measured. There is a problem that the time difference from the time when the steel is cooled is large, and appropriate cooling control for bringing the cooled steel material to a predetermined temperature cannot be performed.

【0003】このため、巻取温度計の直前にバーニアス
プレと呼ばれるスプレを設置し、このバーニアスプレに
よって熱間圧延鋼材を、再度冷却することにより、遅れ
時間の少ない制御を行っている。
For this reason, a spray called a vernier spray is installed immediately before the winding thermometer, and the hot rolled steel material is cooled again by this vernier spray to perform control with a short delay time.

【0004】[0004]

【発明が解決しようとする課題】ところで、冶金的な見
地から、熱間圧延鋼材の望ましい冷却パターンがある。
この望ましい冷却パターンと、上述したバーニアスプレ
によって冷却した冷却パターンとを、図4を参照して説
明する。図4では、望ましい冷却パターンを破線、バー
ニアスプレによって冷却した冷却パターンを実線で示
す。
From the metallurgical point of view, there is a desirable cooling pattern for hot rolled steel.
This desirable cooling pattern and the cooling pattern cooled by the above-mentioned vernier spray will be described with reference to FIG. In FIG. 4, a desirable cooling pattern is shown by a broken line, and a cooling pattern cooled by vernier spray is shown by a solid line.

【0005】図4に示すように、バーニアスプレによる
冷却パターンは、冶金的に望ましい冷却パターンとは異
なるため、見掛上の巻取温度が一致しても鋼材の材質が
異なるという問題がある。本発明は、上記事情に鑑み、
冶金的に望ましい冷却パターンで熱間圧延鋼材を冷却す
る熱間圧延鋼材の冷却方法を提供することを目的とす
る。
As shown in FIG. 4, the vernier spray cooling pattern is different from the metallurgically desirable cooling pattern, so that there is a problem in that the steel material is different even if the apparent winding temperatures are the same. In view of the above circumstances, the present invention is
An object of the present invention is to provide a method for cooling a hot rolled steel product which cools the hot rolled steel product in a metallurgically desirable cooling pattern.

【0006】[0006]

【課題を解決するための手段】本発明は、ホットストリ
ップミルの冷却制御においては、図4に示す冶金的要求
冷却パターンを満たすことが、鋼の材質をコントロール
する上で重要であるという知見に基づくものである。発
明者らは、ホットストリップミルの冶金的必要冷却パタ
ーンを各種のサイズ、鋼種について検討した。この結
果、冷却ゾーン設備内に設置された複数個の温度計のう
ち、水冷却終了点に設置した温度計、または冷却ゾーン
における鋼板進行方向の最適な温度計を選択して、これ
らのうちのいずれかの温度計による測温結果に基づいて
冷却スプレを調整して冷却制御することにより、例えば
図4の破線で示す冶金的要求冷却パターンを精度良く得
ることができることを見出し、本発明をなすに至った。
The present invention has found that, in the cooling control of a hot strip mill, it is important to satisfy the metallurgical required cooling pattern shown in FIG. 4 in order to control the steel material. It is based. The inventors investigated the metallurgical required cooling pattern of the hot strip mill for various sizes and steel grades. As a result, among a plurality of thermometers installed in the cooling zone facility, a thermometer installed at the water cooling end point or an optimal thermometer in the steel plate traveling direction in the cooling zone is selected, and It is found that, for example, the metallurgical required cooling pattern shown by the broken line in FIG. 4 can be accurately obtained by adjusting the cooling spray and controlling the cooling based on the temperature measurement result by any of the thermometers, and the present invention is made. Came to.

【0007】具体的には、本発明の熱間圧延鋼材の冷却
方法は、(1)冷却スプレによって冷却された熱間圧延
鋼材が復熱する位置を鋼種、寸法ごとに予め求めてお
き、(2)鋼種、寸法に応じてこの位置における熱間圧
延鋼材の表面温度が目標温度に一致するように、熱間圧
延鋼材の冷却をフィードバック制御することを特徴とす
るものである。
Specifically, in the method for cooling a hot rolled steel product according to the present invention, (1) the position at which the hot rolled steel product cooled by the cooling spray reheats is obtained in advance for each steel type and size. 2) The cooling of the hot-rolled steel product is feedback-controlled so that the surface temperature of the hot-rolled steel product at this position matches the target temperature according to the steel type and size.

【0008】ここで、「復熱する」とは、熱間圧延鋼材
を冷却することにより板厚方向に生じる非定状温度分布
が、空冷時の定常温度分布になることをいう。
Here, "recovering" means that the non-uniform temperature distribution generated in the plate thickness direction by cooling the hot rolled steel material becomes a steady temperature distribution during air cooling.

【0009】[0009]

【作用】本発明の熱間圧延鋼材の冷却方法によれば、圧
延後に冷却された熱間圧延鋼材の復熱する位置が鋼種、
寸法ごとに予め求められており、この復熱する位置にお
いて熱間圧延鋼材の表面温度が測定される。この復熱す
る位置は、水冷によって板厚断面方向に生じた非平衡状
態の温度分布から定常状態の温度分布に回復した位置で
あると共に、冷却終了点直近の位置である。このため、
断面平均温度の誤差が極めて少なくなると共に、目標温
度から異なっていることが判明した場合であっても温度
測定位置が冷却終了点直近にあるため、制御応答が向上
し温度精度が改善される。
According to the method for cooling a hot rolled steel product of the present invention, the position where the hot rolled steel product cooled after rolling is reheated is the type of steel,
The surface temperature of the hot-rolled steel material is measured at the position where the heat is restored, which is obtained in advance for each dimension. The position where the heat is regenerated is a position where the temperature distribution in the non-equilibrium state generated in the plate thickness cross-section direction due to water cooling is restored to the temperature distribution in the steady state, and is a position near the cooling end point. For this reason,
The error of the average temperature of the cross section becomes extremely small, and even if it is found that the temperature differs from the target temperature, the temperature measurement position is close to the cooling end point, so the control response is improved and the temperature accuracy is improved.

【0010】[0010]

【実施例】次に、本発明の実施例を図面を参照して説明
する。図1は、本発明の一実施例の熱間圧延鋼材の冷却
方法を行う際に使用した冷却設備の概略構成を示す概略
図である。最終仕上ミル10によって圧延された鋼材1
2は、複数の冷却スプレ14によって冷却され、コイラ
16で巻き取られる。この鋼材は、必要に応じて温度計
18、26、中間温度計20、22、24によって測温
され、この測温結果はコントローラ28に入力され、こ
れにより冷却スプレ14の冷却パターンが変更される。
Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of a cooling facility used when performing a method for cooling a hot-rolled steel product according to an embodiment of the present invention. Steel material 1 rolled by final finishing mill 10
2 is cooled by a plurality of cooling sprays 14 and wound up by a coiler 16. The temperature of this steel material is measured by the thermometers 18, 26 and the intermediate thermometers 20, 22, 24 as necessary, and the temperature measurement result is input to the controller 28, whereby the cooling pattern of the cooling spray 14 is changed. .

【0011】図2は、冷却熱流束1.2×106kca
l/m2 ・hrで、冷却を行った際の、冷却開始後の経
過時間(秒)と、平均温度と表面温度の差(℃)との関
係を示すグラフである。平均温度と表面温度の差が0に
近くなったときが復熱完了を示し、板厚の厚い材料程、
復熱が完了するまでに長時間を要することがわかる。こ
の板厚と復熱所要時間との関係に基づいて、本発明者
は、冷却ゾーン開始点から冶金的必要冷却パターンに復
熱時間を加味した45m、60m、75mの3点に中間
温度計1、2、3、を設置した冷却装置により、板厚が
24mm、6.0mm、1.2mmの材料を冷却して、
その冷却曲線を求めた。
FIG. 2 shows a cooling heat flux of 1.2 × 106 kca.
6 is a graph showing the relationship between the elapsed time (seconds) after the start of cooling and the difference (° C.) between the average temperature and the surface temperature when cooling is performed at 1 / m 2 · hr. When the difference between the average temperature and the surface temperature is close to 0, the recuperation is complete, and the thicker the material,
It can be seen that it takes a long time to complete the recuperation. Based on the relationship between the plate thickness and the required reheat time, the present inventor has determined that the intermediate thermometer 1 has three points, 45 m, 60 m, and 75 m, in which the reheat time is added to the metallurgical required cooling pattern from the starting point of the cooling zone. Cooling materials with plate thicknesses of 24 mm, 6.0 mm, and 1.2 mm by cooling devices equipped with 2, 3,
The cooling curve was calculated.

【0012】図3に、板厚24.0mm材、6.0mm
材、1.2mm材のそれぞれの冷却開始から冷却終了
後、復熱完了までの表面温度と平均温度の推移を、RO
T(ランナウトテーブル)上の位置と対応させて示す。
1.2mm材は中間温度計1、6.0mm材は中間温度
計2、24.0mm材は中間温度計3のそれぞれ計測結
果に基づいて、この測定温度が冶金的必要冷却パターン
から求められた所定温度になるように、コントローラ2
8により冷却制御が行われた。
FIG. 3 shows a material having a plate thickness of 24.0 mm and 6.0 mm.
The transition of the surface temperature and the average temperature from the start of cooling of each material and 1.2 mm material to the end of recuperation
It is shown in correspondence with the position on the T (runout table).
Based on the measurement results of the intermediate thermometer 1 for the 1.2 mm material, the intermediate thermometer 2 for the 6.0 mm material, and the intermediate thermometer 3 for the 24.0 mm material, this measured temperature was determined from the metallurgical required cooling pattern. Controller 2 so that it reaches a predetermined temperature
The cooling control was performed by 8.

【0013】この結果、従来の巻取装置前に配置された
温度計26(図1参照)を用いて行った冷却制御時の温
度精度(±10℃以内)が85%であるのに対し、本実
施例の方法では95%に向上した。なお、本実施例の方
法は、復熱時間後に温度測定した例であるが、板厚、材
質及び冷却パターン毎の平均温度と表面温度との差を予
め求めておき、冷却終了点の温度測定値から上記温度差
を減算した値に基づいて、この測定温度が所定温度にな
るように冷却制御を行ってもよい。この場合は、特に、
復熱に時間を要する厚い板の場合に遅れ時間がなくなる
ため有効である。
As a result, the temperature accuracy (within ± 10 ° C.) during the cooling control performed using the thermometer 26 (see FIG. 1) arranged in front of the conventional winding device is 85%, whereas With the method of this example, it was improved to 95%. The method of this example is an example in which the temperature was measured after the recuperation time, but the difference between the average temperature and the surface temperature for each of the plate thickness, the material and the cooling pattern was previously obtained, and the temperature at the cooling end point was measured. Based on the value obtained by subtracting the temperature difference from the value, cooling control may be performed so that the measured temperature becomes the predetermined temperature. In this case, in particular,
This is effective because the delay time is eliminated in the case of thick plates that require time to reheat.

【0014】[0014]

【発明の効果】本発明の熱間圧延鋼材の冷却方法では、
冷却された熱間圧延鋼材が復熱する位置が予め求めら
れ、この位置において熱間圧延鋼材の表面温度が測定さ
れて冷却が制御されるため、冶金的要求冷却パターンを
精度よく実現できる。このため鋼材の材質制御が容易に
なり、鋼材の材質精度が向上する。
According to the cooling method of the hot rolled steel material of the present invention,
A position where the cooled hot-rolled steel material reheats is obtained in advance, and the surface temperature of the hot-rolled steel material is measured at this position to control the cooling, so that the required metallurgical cooling pattern can be accurately realized. Therefore, the material control of the steel material is facilitated and the material accuracy of the steel material is improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例の熱間圧延鋼材の冷却方法を
行う際に使用した冷却設備の概略構成を示す概略図であ
る。
FIG. 1 is a schematic view showing a schematic configuration of a cooling facility used when performing a method for cooling a hot rolled steel product according to an embodiment of the present invention.

【図2】冷却熱流束1.2×106kcal/m2 ・h
rで冷却を行った際の、冷却開始後の経過時間(秒)と
平均温度及び表面温度の差(℃)との関係を示すグラフ
である。
[Fig. 2] Cooling heat flux 1.2 × 106 kcal / m 2 · h
It is a graph which shows the relationship between the elapsed time (second) after the start of cooling and the difference (° C.) between the average temperature and the surface temperature when cooling is performed at r.

【図3】板厚24.0mm材、6.0mm材、1.2m
m材の冷却開始から冷却終了後復熱完了間での表面温度
と平均温度の推移を、ROT上の位置と対応させて示す
グラフである。
[Fig. 3] Plate thickness 24.0 mm material, 6.0 mm material, 1.2 m
7 is a graph showing changes in surface temperature and average temperature between the start of cooling of the m material and the completion of recuperation after the end of cooling, in association with the position on the ROT.

【図4】冶金的な見地から望ましい冷却パターンと、バ
ーニアスプレによって冷却した冷却パターンとを示すグ
ラフであり、破線は望ましい冷却パターン、実線はバー
ニアスプレによる冷却パターンを示す。
FIG. 4 is a graph showing a desirable cooling pattern from a metallurgical point of view and a cooling pattern cooled by vernier spray, in which a broken line shows a desirable cooling pattern and a solid line shows a cooling pattern by vernier spray.

【符号の説明】[Explanation of symbols]

10 最終仕上ミル 12 鋼材 14 冷却スプレ 16 コイラ 20、22、24 中間温度計 28 コントローラ 10 Final Finishing Mill 12 Steel Material 14 Cooling Spray 16 Coiler 20, 22, 24 Intermediate Thermometer 28 Controller

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 冷却スプレによって冷却された熱間圧延
鋼材が復熱する位置を鋼種、寸法ごとに予め求めてお
き、 鋼種、寸法に応じて前記位置における前記熱間圧延鋼材
の表面温度が目標温度に一致するように、前記熱間圧延
鋼材の冷却をフィードバック制御することを特徴とする
熱間圧延鋼材の冷却方法。
1. The position at which the hot-rolled steel material cooled by the cooling spray reheats is obtained in advance for each steel type and size, and the surface temperature of the hot-rolled steel material at the position is targeted according to the steel type and size. A method for cooling a hot-rolled steel product, characterized in that the cooling of the hot-rolled steel product is feedback-controlled so as to match the temperature.
JP4215147A 1992-08-12 1992-08-12 Method for cooling hot rolled steel Pending JPH0657339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4215147A JPH0657339A (en) 1992-08-12 1992-08-12 Method for cooling hot rolled steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4215147A JPH0657339A (en) 1992-08-12 1992-08-12 Method for cooling hot rolled steel

Publications (1)

Publication Number Publication Date
JPH0657339A true JPH0657339A (en) 1994-03-01

Family

ID=16667459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4215147A Pending JPH0657339A (en) 1992-08-12 1992-08-12 Method for cooling hot rolled steel

Country Status (1)

Country Link
JP (1) JPH0657339A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100496824B1 (en) * 2000-11-08 2005-06-22 주식회사 포스코 Cooling control method of hot strip using intermediate pyrometer on run-out table

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100496824B1 (en) * 2000-11-08 2005-06-22 주식회사 포스코 Cooling control method of hot strip using intermediate pyrometer on run-out table

Similar Documents

Publication Publication Date Title
US4274273A (en) Temperature control in hot strip mill
US10655197B2 (en) Determining the ferrite phase fraction after heating or cooling of a steel strip
JPS587366B2 (en) Stritupuo Reiki Yakusuru Hohou
JPH06198302A (en) Method and equipment for producing hot rolled steel strip particularly from material continuously cast into strip form
JPH0657339A (en) Method for cooling hot rolled steel
KR101498890B1 (en) Method for controlling edge mask of cooling apparatus
JP3546864B2 (en) Hot rolling method and apparatus
JPH11267730A (en) Device for controlling temperature of hot rolled sheet and its method
JP3058403B2 (en) Cooling control method for hot rolled steel sheet
JP2004331992A (en) Method for predicting temperature of and cooling metal sheet in hot rolling
JP2002219504A (en) Hot rolling method and its facilities
JP3698088B2 (en) Manufacturing method of hot-rolled steel strip
JP4192013B2 (en) Manufacturing method of steel plate for striping in hot rolling line
JP2538785B2 (en) Work crown control method
JP3329297B2 (en) Hot rolling method
JP2001137943A (en) Method and device for controlling flatness of metallic sheet
KR100451823B1 (en) Slow Cooling Method For Hot Rolled Wire Rod
KR100496824B1 (en) Cooling control method of hot strip using intermediate pyrometer on run-out table
JP4691836B2 (en) Hot endless rolling method and manufacturing method of hot endless rolled product
KR100306142B1 (en) Method for setting inductive heating patterns in mini-mill process
JPH0671321A (en) Coiling temperature controlling method for hot rolled steel sheet
JP2001137931A (en) Manufacture of hot-rolled steel sheet excellent in uniformity of crown and shape of steel sheet
JPH08257615A (en) Method and device for controlling temperature on outlet side of finishing of hot rolling mill
JP3113379B2 (en) Cooling method of hot rolled steel sheet
JPS58125312A (en) Method for making structure of band steel uniform in hot rolling mill

Legal Events

Date Code Title Description
A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20030212