JPH0523848B2 - - Google Patents
Info
- Publication number
- JPH0523848B2 JPH0523848B2 JP61108784A JP10878486A JPH0523848B2 JP H0523848 B2 JPH0523848 B2 JP H0523848B2 JP 61108784 A JP61108784 A JP 61108784A JP 10878486 A JP10878486 A JP 10878486A JP H0523848 B2 JPH0523848 B2 JP H0523848B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- temperature
- steel plate
- water
- average
- 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.)
- Expired - Fee Related
Links
- 238000001816 cooling Methods 0.000 claims description 60
- 229910000831 Steel Inorganic materials 0.000 claims description 46
- 239000010959 steel Substances 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000012937 correction Methods 0.000 claims description 5
- 230000000704 physical effect Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Metal Rolling (AREA)
- Control Of Heat Treatment Processes (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、各種鋼板生産ライン、例えば厚鋼板
やホツトストリツプミルにおける熱間仕上圧延後
の高温厚鋼板冷却における水量決定方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for determining the amount of water used in cooling high-temperature thick steel plates after hot finish rolling in various steel plate production lines, such as thick steel plate and hot strip mills. be.
（従来の技術）
従来、ホツトストリツプミルにおけるランアウ
トテーブル冷却や厚板における加速冷却など鋼板
の強制水冷却が実施されている。例えば、特公昭
58−15202号公報に記載の方法はランアウトテー
ブルにおける薄板の冷却を主対象としたものであ
り、既知の設備の冷却能から鋼板サイズ、操業条
件を考慮し、必要冷却長を決定するものである。
この冷却長決定に際し、鋼板温度予測において、
板厚方向にて均一な温度であると仮定して基本式
を導入している。さらに、精度向上のため、実操
業データとの対応にて補正を加えている。さら
に、特開昭58−32511号公報には、厚鋼板を加速
冷却するようにした厚鋼板の冷却方法および装置
が記載されている。そして、この特開昭58−
32511号公報の場合は、前記公告公報の場合と同
様に板厚方向で均一な温度であると仮定して基本
式を導入している他、厚板を対象としているの
で、補正を加えている。(Prior Art) Forced water cooling of steel plates has conventionally been carried out, such as runout table cooling in hot strip mills and accelerated cooling of thick plates. For example, Tokko Akira
The method described in Publication No. 58-15202 is mainly aimed at cooling thin plates in run-out tables, and the required cooling length is determined by considering the steel plate size and operating conditions from the known cooling capacity of the equipment. .
When determining this cooling length, in predicting the steel plate temperature,
The basic formula is introduced assuming that the temperature is uniform in the thickness direction. Furthermore, in order to improve accuracy, corrections have been made in correspondence with actual operational data. Further, Japanese Patent Application Laid-Open No. 58-32511 describes a method and apparatus for cooling a thick steel plate in which the thick steel plate is acceleratedly cooled. And this Unexamined Patent Application Publication No. 58-
In the case of Publication No. 32511, as in the case of the above-mentioned publication, a basic formula is introduced assuming that the temperature is uniform in the thickness direction of the plate, and since the target is a thick plate, corrections are added. .
（発明が解決しようとする問題点）
前述のように、従来技術の適用範囲は、鋼板が
薄い場合や、逆に鋼板が比較的厚い時には、冷却
が比較的弱い場合に限られていた。したがつて、
鋼板が厚い場合や強い冷却能力を要求される場合
には、従来技術において、基本式の導入の前提で
ある板厚方向の均一温度分布とは掛け離れたもの
となり、少々の補正では鋼板の温度予測は不能と
なる。一方、前記の条件に対し、差分法による数
値解析を適用することも可能であるが、計算容量
の点から別途専用の計算機を用意する必要がある
などの問題がある。(Problems to be Solved by the Invention) As described above, the scope of application of the prior art is limited to cases where the steel plate is thin or, conversely, when the steel plate is relatively thick, the cooling is relatively weak. Therefore,
When the steel plate is thick or a strong cooling capacity is required, the conventional technology is far from achieving a uniform temperature distribution in the plate thickness direction, which is the premise of introducing the basic formula, and it is difficult to predict the temperature of the steel plate with a small correction. becomes impossible. On the other hand, it is possible to apply numerical analysis using the finite difference method to the above conditions, but there are problems such as the need to separately prepare a dedicated computer in terms of calculation capacity.
本発明は、前記従来の問題点に鑑みてなされた
もので、特に複雑な計算方法は用いずに、鋼板の
板厚方向の温度分布および強制水冷却中の鋼板表
面温度を考慮することにより、強い冷却能力が要
求される場合でも広い範囲にわたつて対応できる
高温厚鋼板冷却における水量決定方法を提供しよ
うとするものである。 The present invention has been made in view of the above-mentioned conventional problems, and by considering the temperature distribution in the thickness direction of the steel plate and the steel plate surface temperature during forced water cooling, without using any particularly complicated calculation method, The purpose of this invention is to provide a method for determining the amount of water in cooling high-temperature thick steel plates that can be applied over a wide range even when strong cooling capacity is required.
（問題点を解決するための手段）
前記問題点を解決するために、本発明は、仕上
げ圧延後の高温厚鋼板を強制水冷却する際して、
予め鋼板サイズ、冷却開始温度Ts、目標冷却停
止温度Tf0、目標平均冷却速度CR0を決めて、冷
却開始前の鋼板板厚方向の平均温度ｓを予測
し、目標の、または予測される冷却停止時の板厚
方向平均温度f0を求め、ｓ〜f0間で温度予
測に必要な物性値を決定し、前記物性値、鋼板サ
イズ、水温および（ｓ−f0）／CR0で計算さ
れる冷却時間τから、鋼板の板厚方向の温度分布
を考慮して冷却するのに必要な平均熱伝達率を
決定し、かつ冷却停止時の鋼板表面温度Tfを計
算し、予め決定した基準水量密度ω0における鋼
板表面温度Ｔと熱伝達率α0の関係より、冷却開始
温度Tsすなわち冷却開始時の鋼板表面温度と前
記冷却停止時の鋼板表面温度Tfとの間にて平均
熱伝達率0を求め、次式
ω＝ω0・（／0）n〓・ｆ（Tw）
nω：係数
ｆ（Tw）：水温の補正項
より、必要水量密度ωを決定し、鋼板サイズや冷
却条件等より決定された冷却設備での注水範囲を
考慮して、冷却設備に必要な冷却水量WTを決定
するようにした。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides the following features:
Determine the steel plate size, cooling start temperature Ts, target cooling stop temperature Tf0 , and target average cooling rate CR0 in advance, predict the average temperature s in the thickness direction of the steel plate before starting cooling, and calculate the target or predicted cooling. Find the average temperature in the thickness direction f0 at the time of stopping, determine the physical property values necessary for temperature prediction between s and f0 , and calculate the cooling calculated from the physical property values, steel plate size, water temperature, and (s- f0 )/CR 0 . From the time τ, determine the average heat transfer coefficient required for cooling by considering the temperature distribution in the thickness direction of the steel plate, calculate the steel plate surface temperature T f at the time of stopping cooling, and predetermine the reference water flow density. From the relationship between the steel plate surface temperature T and heat transfer coefficient α 0 at ω 0 , the average heat transfer coefficient is 0 between the cooling start temperature Ts, that is, the steel plate surface temperature at the start of cooling and the steel plate surface temperature T f at the time of cooling stop. Determine the required water density ω from the following formula ω = ω 0・(/ 0 ) n 〓・f(Tw) nω: coefficient f(Tw): water temperature correction term, and calculate from the steel plate size, cooling conditions, etc. The amount of cooling water W T required for the cooling equipment is determined in consideration of the determined range of water injection in the cooling equipment.
（実施例）
次に、本発明の一実施例を図面にしたがつて説
明する。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図は、本発明に係る方法を適用した厚板仕
上げ圧延設備の概略を示し、通板方向に沿つて仕
上圧延機１，冷却設備２，ホツトレベラ３が配設
してあり、鋼板４をパスライン５に沿つて図中右
から左へ通すようになつている。また、冷却設備
２の前後には厚鋼板４の表面温度を測定するため
に入側温度計６，出側温度計７が設けてある。 FIG. 1 schematically shows a thick plate finish rolling facility to which the method according to the present invention is applied, in which a finish rolling mill 1, cooling equipment 2, and hot leveler 3 are arranged along the strip threading direction, and a steel plate 4 is It is designed to pass along the pass line 5 from right to left in the figure. Furthermore, an inlet thermometer 6 and an outlet thermometer 7 are provided before and after the cooling equipment 2 in order to measure the surface temperature of the thick steel plate 4.
なお、図中二点鎖線にて示すように、冷却設備
２、出側温度計７はホツトレベラ３の通板方向で
ある前方に配置することもある。 In addition, as shown by the two-dot chain line in the figure, the cooling equipment 2 and the outlet thermometer 7 may be arranged in front of the hot leveler 3 in the sheet passing direction.
冷却設備２による冷却方法は、鋼板４を搬送し
ながら後端に向かつて逐次冷却する一方向通板方
法である。ちなみに冷却方法には、この他鋼板４
を往復させながら冷却するオツシレーシヨン通板
により冷却するものがあるが、後記する本発明に
係る方法の適用に関して、冷却方法は何ら限定す
るものではない。 The cooling method using the cooling equipment 2 is a one-way sheet passing method in which the steel sheet 4 is conveyed and sequentially cooled toward the rear end. By the way, in addition to this cooling method, steel plate 4
There is a method in which cooling is performed by passing through an oscillation plate, which is cooled while reciprocating, but the cooling method is not limited in any way to the application of the method according to the present invention, which will be described later.
そして、前記設備において、仕上圧延機１を出
た鋼板４を冷却設備２での冷却終了後、ホツトレ
ベラ３前まで搬送して、一旦静止させ、つづい
て、本発明に係る方法を実施するために出側温度
計７により鋼板４の温度を測定する。すなわち、
同一場所にて温度に関して多時点のサンプリング
を行うようにしてある。測定後、再度鋼板４の搬
送を始めてホツトレベラ３にて鋼板４のレベリン
グを行い、内部応力、歪を除去する。 Then, in the equipment, after the steel plate 4 leaving the finishing mill 1 is cooled in the cooling equipment 2, it is conveyed to the front of the hot leveler 3 and once stopped, and then the method according to the present invention is carried out. The temperature of the steel plate 4 is measured by the outlet thermometer 7. That is,
Temperature sampling is performed at multiple times at the same location. After the measurement, the steel plate 4 is conveyed again, and the steel plate 4 is leveled by the hot leveler 3 to remove internal stress and distortion.
次に、本発明に係る高温厚鋼板冷却における水
量決定方法を上記設備に適用して具体的に説明す
る。 Next, the method for determining the amount of water in cooling a high-temperature thick steel plate according to the present invention will be specifically explained by applying it to the above-mentioned equipment.
第２図のフローチヤートに示すように、まずス
テツプで必要なデータを確保する。すなわち、
鋼板サイズ（板厚Ｈ，板幅Ｂ，板長さＬ）
冷却開始温度Ts（通常、鋼板表面温度である。）
目標冷却停止温度Tf0（通常、鋼板表面温度であ
る。）
目標平均冷却速度CR0
を決める。 As shown in the flowchart of FIG. 2, the first step is to secure the necessary data. That is, steel plate size (plate thickness H, plate width B, plate length L) Cooling start temperature Ts (usually the steel plate surface temperature) Target cooling stop temperature T f0 (usually the steel plate surface temperature) Target average Determine the cooling rate CR 0 .
ステツプで、冷却開始および冷却停止時の板
厚方向の平均温度ｓおよびf0の推定計算を行
う。 In step, the average temperatures s and f0 in the plate thickness direction at the start and stop of cooling are estimated.
sk＝Tsk＋cfs・（Ｈ／6λs）・｛ε・σ（Ts4ｋ
−T4/aｋ）＋αc・（Tsk−Tak）｝ ……(1)
ｓ＝sk−273 ……(2)
なお、Tsk＝Ts＋273
cfs：係数
λs：温度がTsの時の熱伝導率
ε：放射率
σ：ステフアンボルツマン定数
Tak：雰囲気温度
αc：対流熱伝導率
f0ｋ＝Tf0ｋ＋cff・（Ｈ／6λ）・｛ε・σ（T4/f0
ｋ−T4/aｋ）＋αc・（Tf0ｋ−Tak）｝ ……(3)
f0＝Tf0ｋ−273 ……(4)
なお、Tf0ｋ＝Tf0＋273
cff：係数
λf：温度がTfの時の熱伝導率
ステツプで、冷却時間τを計算する。 sk=Tsk+cfs・(H/6λs)・{ε・σ(Ts 4 k
−T 4/a k)+αc・(Tsk−Tak)} …(1) s=sk−273 …(2) In addition, Tsk=Ts+273 cfs: Coefficient λs: Thermal conductivity when the temperature is T s ε: Emissivity σ: Stephan-Boltzmann constant Tak: Ambient temperature αc: Convective thermal conductivity f0 k=T f0 k+cf f・(H/6λ)・{ε・σ(T 4/f0
k−T 4/a k)+αc・(T f0 k−Tak)} ……(3) f0 =T f0 k−273 ……(4) In addition, T f0 k=T f0 +273 cf f : Coefficient λ f : Thermal conductivity when the temperature is T f In step, calculate the cooling time τ.
τ＝（ｓ−f0）／CR0 ……(5)
ステツプで、物性値を決定する。具体的に
は、比熱Ｃと熱伝導率λの温度依存性を考慮し、
温度ｓ〜f0間の平均値、すなわち第３図、第
４図の斜線部分の平均値およびを計算する。 τ=(s- f0 )/ CR0 ...(5) In step, the physical property values are determined. Specifically, considering the temperature dependence of specific heat C and thermal conductivity λ,
The average value between temperatures s and f0 , that is, the average value of the shaded areas in FIGS. 3 and 4, is calculated.
ステツプで、冷却条件を満足するのに必要な
平均熱伝達率を決定するに際して、その初期値
を決定する。この場合、平均熱伝達率を一定
値、例えば1000kcal／m2・ｈ・℃としてもよい
が、計算時間を短縮するうえから板厚Ｈと目標の
冷却速度CR0の関数としておく方が望ましく、次
式のように表わす。 In the step, when determining the average heat transfer coefficient necessary to satisfy the cooling conditions, an initial value thereof is determined. In this case, the average heat transfer coefficient may be set to a constant value, for example, 1000 kcal/m 2 · h · °C, but in order to shorten calculation time, it is preferable to set it as a function of the plate thickness H and the target cooling rate CR 0 . It is expressed as the following formula.
＝K1・（CR0・Ｈ）n ……(6)
K1，ｎ：係数
ステツプで、冷却停止平均温度fを計算す
る。 =K 1・(CR 0・H) n ... (6) K 1 , n: coefficient In step, calculate the cooling stop average temperature f .
Tf−Tw／Ts−Tw＝K
〓
〓n=1
４／Pn・Ｈ・sin2Pn・Ｈ／２／Pn・Ｈ／２＋sinPn・
Ｈ／２・cosPn・Ｈ／２・e-a T f −Tw／Ts−Tw＝ K 〓 〓 n=1 4/Pn・H・sin 2 Pn・H/2/Pn・H/2+sinPn・
H/2・cosPn・H/2・e -a
Claims (1)
際して、予め鋼板サイズ、冷却開始温度Ts、目
標冷却停止温度Tf0、目標平均冷却速度CR0を決
めて、冷却開始前の鋼板板厚方向の平均温度ｓ
を予測し、目標の、または予測される冷却停止時
の板厚方向平均温度f0を求め、ｓ〜f0間で
温度予測に必要な物性値を決定し、前記物性値、
鋼板サイズ、水温および（ｓ−f0）／CR0で
計算される冷却時間τから、鋼板の板厚方向の温
度分布を考慮して冷却するのに必要な平均熱伝達
率を決定し、かつ冷却停止時の鋼板表面温度
Tfを計算し、予め決定した基準水量密度ω0にお
ける鋼板表面温度Ｔと熱伝達率α0の関係より、冷
却開始温度Tsすなわち冷却開始時の鋼板表面温
度と前記冷却停止時の鋼板表面温度Tfとの間に
て平均熱伝達率0を求め、次式 ω＝ω0・（／0）n〓・ｆ（Tw） nω：係数 ｆ（Tw）：水温の補正項 より、必要水量密度ωを決定し、鋼板サイズや冷
却条件等より決定された冷却設備での注水範囲を
考慮して、冷却設備に必要な冷却水量WTを決定
するようにしたことを特徴とする高温厚鋼板冷却
における水量決定方法。[Claims] 1. When performing forced water cooling on a high-temperature thick steel plate after finishing rolling, the steel plate size, cooling start temperature Ts, target cooling stop temperature T f0 , and target average cooling rate CR 0 are determined in advance, and cooling is performed. Average temperature s in the thickness direction of the steel plate before starting
, calculate the target or predicted average temperature in the plate thickness direction at the time of cooling stop, f0 , determine the physical property values necessary for temperature prediction between s and f0 , and calculate the physical property values,
From the steel plate size, water temperature, and cooling time τ calculated by (s- f0 )/CR 0 , determine the average heat transfer coefficient required for cooling by considering the temperature distribution in the thickness direction of the steel plate, and Steel plate surface temperature when stopped
T f is calculated, and from the relationship between the steel plate surface temperature T and the heat transfer coefficient α 0 at a predetermined standard water flow density ω 0 , the cooling start temperature Ts, that is, the steel plate surface temperature at the start of cooling and the steel plate surface temperature at the time of stopping the cooling. Find the average heat transfer coefficient 0 between T f and use the following formula ω = ω 0・(/ 0 ) n 〓・f(Tw) nω: Coefficient f(Tw): Water temperature correction term to calculate the required water volume density. ω is determined, and the amount of cooling water W T required for the cooling equipment is determined by taking into account the range of water injection in the cooling equipment determined from the steel plate size, cooling conditions, etc. How to determine the amount of water in
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61108784A JPS62263816A (en) | 1986-05-12 | 1986-05-12 | Water amount determining method for high temperature steel plank cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61108784A JPS62263816A (en) | 1986-05-12 | 1986-05-12 | Water amount determining method for high temperature steel plank cooling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62263816A JPS62263816A (en) | 1987-11-16 |
| JPH0523848B2 true JPH0523848B2 (en) | 1993-04-06 |
Family
ID=14493391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61108784A Granted JPS62263816A (en) | 1986-05-12 | 1986-05-12 | Water amount determining method for high temperature steel plank cooling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62263816A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0480324A (en) * | 1990-07-24 | 1992-03-13 | Nippon Steel Corp | Method for cooling steel plate |
| JP2604518B2 (en) * | 1992-06-26 | 1997-04-30 | 新日本製鐵株式会社 | Steel plate straightening method |
| JP4890433B2 (en) * | 2007-12-28 | 2012-03-07 | 株式会社神戸製鋼所 | Rolled material temperature prediction method, rolled material cooling device control method, and continuous rolling equipment |
| JP5239887B2 (en) * | 2009-01-20 | 2013-07-17 | 新日鐵住金株式会社 | Hot rolled steel sheet manufacturing apparatus and manufacturing method |
| JP6495069B2 (en) * | 2015-03-30 | 2019-04-03 | 株式会社神戸製鋼所 | Thick steel plate cooling method and thick steel plate cooling device |
-
1986
- 1986-05-12 JP JP61108784A patent/JPS62263816A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62263816A (en) | 1987-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114888094B (en) | Flatness Compensation Method Based on Prediction of Residual Stress in Cooling Process | |
| JP5391205B2 (en) | Control device | |
| JPH09267113A (en) | Method for controlling cooling hot rolled steel sheet | |
| JP4349177B2 (en) | Steel extraction temperature prediction method for continuous heating furnace | |
| JP2786760B2 (en) | Prediction method of rolling temperature of steel sheet in hot rolling | |
| JPS62263816A (en) | Water amount determining method for high temperature steel plank cooling | |
| JP2768637B2 (en) | Rolling load prediction method | |
| JPH0671315A (en) | Method for estimating rolling temperature of steel sheet in hot rolling | |
| JP2554414B2 (en) | Prediction method of rolling temperature of steel sheet in hot rolling | |
| JP2002143913A (en) | Hot rolling method | |
| JPH0899111A (en) | Method for predicting rolling temperature of rolled material | |
| JPH06264153A (en) | Method for predicting slab temperature in continuous heating furnace | |
| JPS59125203A (en) | Method for controlling temperature of rough rolling steel sheet | |
| JPS5818401B2 (en) | Continuous heating furnace control method | |
| JPS5819435A (en) | Controlling method for continuous heating furnace | |
| JPH0480324A (en) | Method for cooling steel plate | |
| JPH0331521B2 (en) | ||
| JPH04354827A (en) | Method for estimating temperature distribution in plate thickness direction in stopping cooling | |
| JP3525522B2 (en) | Temperature Prediction Method of Steel Sheet Tip in Hot Rolling | |
| JPH0480976B2 (en) | ||
| JP6451331B2 (en) | Identification method of heat transfer coefficient | |
| JP2003138318A (en) | Quality control method of hot-rolled steel sheet, its apparatus and hot-rolled steel sheet | |
| JP2758275B2 (en) | Rolling tip warpage control method | |
| JPS5938286B2 (en) | How to cool metal strips | |
| JP2002137013A (en) | How to set cooling conditions for steel sheets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |