JPS6337170B2 - - Google Patents
Info
- Publication number
- JPS6337170B2 JPS6337170B2 JP59025245A JP2524584A JPS6337170B2 JP S6337170 B2 JPS6337170 B2 JP S6337170B2 JP 59025245 A JP59025245 A JP 59025245A JP 2524584 A JP2524584 A JP 2524584A JP S6337170 B2 JPS6337170 B2 JP S6337170B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- strip
- roll
- thickness
- winding angle
- 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
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】
本発明は、連続焼鈍炉冷却帯特に冷却ロールへ
の接触熱伝達によつて鋼帯を冷却するロール冷却
装置を持つ冷却帯の鋼帯冷却方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cooling a steel strip in a continuous annealing furnace cooling zone, particularly in a cooling zone having a roll cooling device for cooling the steel strip by contact heat transfer to the cooling roll.
連続焼鈍炉は、一例として第１図に示す構造を
有し、冷間圧延後の鋼帯（以下ストリツプと称
す）を熱処理するための炉設備である。設備とし
ては、例えば加熱帯Ａ、均熱帯Ｂ、第１冷却帯
Ｃ、過時効帯Ｄ、第２冷却帯Ｅからなり、第２図
に示すヒートサイクルを実現するものである。す
なわち、第１図に示すストリツプ１が炉内に至る
と、まず加熱帯Ａにてたとえば700℃程に加熱さ
れ、ついで均熱帯Ｂにて20秒間700℃に保つてま
んべんなく熱し、今度は第１冷却帯Ｃで毎秒50℃
ずつ冷却し、その後過時効帯Ｄにて２分間400℃
にて過時効処理を行ない、更に第２冷却帯Ｅにて
冷却するという過程を辿る。 A continuous annealing furnace has a structure shown in FIG. 1 as an example, and is a furnace equipment for heat-treating a cold-rolled steel strip (hereinafter referred to as a strip). The equipment includes, for example, a heating zone A, a soaking zone B, a first cooling zone C, an overaging zone D, and a second cooling zone E, and realizes the heat cycle shown in FIG. 2. That is, when the strip 1 shown in Fig. 1 reaches the furnace, it is first heated to about 700°C in the heating zone A, and then kept at 700°C for 20 seconds in the soaking zone B to heat it evenly. 50℃ per second in cooling zone C
Cool at 400°C for 2 minutes in overaging zone D.
The process includes performing an overaging treatment in the second cooling zone E, and further cooling in the second cooling zone E.
このような設備において、第１冷却帯Ｃおよび
第２冷却帯Ｅでは、ストリツプ１の冷却に当り、
従来より、冷却ガスをストリツプ１に吹き付けて
強制対流により冷却を行なういわゆるガスジエツ
ト法が行なわれていた。しかし、最近ではこのガ
スジエツト法よりも冷却能力が高くしかもランニ
ングコストが安いロール冷却法が提案されてい
る。このロール冷却法はストリツプがまきかけら
れるロールに冷媒を通してロールを冷却しロール
に接触するストリツプを冷却するものである。し
かも、ストリツプの板厚などが変化した場合には
ストリツプとロールとの巻付角度を変えることに
より板厚に応じた冷却温度を調整する冷却方法
（特開昭56−35730号公報掲載）も提案されてい
る。 In such equipment, in the first cooling zone C and the second cooling zone E, when cooling the strip 1,
Conventionally, a so-called gas jet method has been used in which cooling gas is blown onto the strip 1 to effect cooling by forced convection. However, recently, a roll cooling method has been proposed which has a higher cooling capacity than the gas jet method and is cheaper in running cost. This roll cooling method cools the roll by passing a refrigerant through the roll on which the strip is wound, thereby cooling the strip in contact with the roll. Furthermore, we have proposed a cooling method (published in Japanese Patent Application Laid-Open No. 56-35730) that adjusts the cooling temperature according to the thickness of the strip by changing the wrapping angle between the strip and the roll when the thickness of the strip changes. has been done.
かかるロール冷却装置としては、一例として第
３図に示すものがある。第３図において、２〜６
は内部に冷媒を流通させた冷却ロールである。こ
のうち、冷却ロール３および５は、巻付角度調整
のため図面の上下方向に移動可能に配置され、こ
の移動はロール駆動装置７および８にて行なわれ
る。なお、冷媒は冷却ロールから熱交換器へ送ら
れ冷却された後、再度冷却ロールに供給される。 An example of such a roll cooling device is shown in FIG. In Figure 3, 2 to 6
is a cooling roll with refrigerant flowing inside. Of these, the cooling rolls 3 and 5 are arranged so as to be movable in the vertical direction of the drawing in order to adjust the winding angle, and this movement is performed by roll drive devices 7 and 8. Note that, after the refrigerant is sent from the cooling roll to the heat exchanger and cooled, it is supplied to the cooling roll again.
このようなロール冷却法で問題となるのは、通
常ストリツプに0.1％前後存在するかた伸び（縁
（耳）のび、もしくは中のび）のため、ストリツ
プの一部が冷却ロールに接触しない現象が生じ、
この結果冷却が不均一となつてしわを発生する事
態が生ずることである。 The problem with this type of roll cooling method is that the strip usually has about 0.1% of elongation (edge (edge) elongation or middle elongation), which causes a phenomenon in which part of the strip does not come into contact with the cooling roll. arise,
As a result, cooling becomes uneven and wrinkles occur.
この問題を解消すべく、特願昭57−129069号公
報では、ロール一本当りのストリツプ温度降下量
に上限値を設けて冷却の不均一を軽減する冷却方
法が提案されている。ここで、ストリツプ温度降
下量は次式で表わされる。 In order to solve this problem, Japanese Patent Application No. 57-129069 proposes a cooling method in which an upper limit is set on the amount of strip temperature drop per roll to reduce uneven cooling. Here, the amount of strip temperature drop is expressed by the following equation.
ΔTs＝（TSI−TW）（１−exp（−
ｋ・θ・π・DR／360／ｃ・γ・ｖ・ｄ））
上式中、
ΔTS：ロール一本当りのストリツプ温度降下
量、〔℃〕
TSI：冷却ロールとの接触開始点におけるス
トリツプ温度。〔℃〕
TW：冷却ロール内冷媒温度、〔℃〕
ｖ：ライン速度、〔m/h〕
ｄ：板厚、〔ｍ〕
ｃ：ストリツプ比熱、〔kcal／Kg℃〕
γ：ストリツプ比重量、〔Kg／m3〕
ｋ：ストリツプ及び冷媒間熱通過率、
〔kcal／m3ｈ℃〕
θ：ロール巻付角（ロール一本におけ
る）、〔度〕
DR：冷却ロールの外径、〔ｍ〕である。ΔT s = (T SI −T W )(1−exp(−
k・θ・π・D R /360/c・γ・v・d)) In the above formula, ΔT S : Strip temperature drop per roll, [℃] T SI : Contact start point with cooling roll strip temperature at . [℃] T W : Refrigerant temperature in cooling roll, [℃] v: Line speed, [m/h] d: Plate thickness, [m] c: Strip specific heat, [kcal/Kg℃] γ: Strip specific weight, [Kg/m 3 ] k: Heat transfer rate between strip and refrigerant,
[kcal/m 3 h°C] θ: Roll wrapping angle (for one roll), [degrees] D R : Outside diameter of the cooling roll, [m].
この式から判明するように、ストリツプの板厚
ｄ、ライン速度ｖ等に応じてストリツプ温度降下
量ΔTSを上限値ΔTSCRに等しくすることを条件と
して、しかもストリツプの最終冷却温度を所定の
許容範囲内におさえるような巻付角度で焼鈍する
のが、ストリツプの形状不良を生ずることなく最
大生産効率で所定の材質を得る最適運転というこ
とになる。 As can be seen from this equation, the strip temperature drop ΔT S must be made equal to the upper limit ΔT SCR depending on the strip thickness d, line speed v, etc., and the final cooling temperature of the strip must be kept within a predetermined tolerance. Annealing at a winding angle within this range is the optimum operation for obtaining the desired material quality at maximum production efficiency without causing defects in the strip shape.
ところが、実際には次のように問題がある。す
なわち、ストリツプが冷却帯を通過する時間は、
数秒程度の時間しかかからないのに比べ、巻付角
度調整のためのロール移動速度は、ストリツプの
張力制御に悪影響を及ぼさないように制限され
る。一例として巻付角度を60度から120度まで変
化させるためのロールを移動する時間は、約２分
かかる。 However, in reality, there are problems as follows. That is, the time it takes the strip to pass through the cooling zone is
While it takes only a few seconds, the speed of roll movement for adjusting the winding angle is limited so as not to adversely affect strip tension control. As an example, it takes about 2 minutes to move the roll to change the winding angle from 60 degrees to 120 degrees.
したがつて、第４図ａに示すように（ストリツ
プの先行材板厚＜後行材板厚）の関係がある場
合、もしくは第４図ｂに示すように（ストリツプ
の先行材板厚＞後行材板厚）の関係がある場合の
いずれにしても、先行材と後行材との板厚の異な
る境界部（溶接部）が冷却帯の入口を通過すると
同時に後行材に対する巻付角度の変更が行なわれ
る。すなわち、板厚変更に伴い後行材の最終冷却
温度を所定の許容範囲内に冷却ししかもΔTS≦
ΔTSCRとなるのに必要な巻付角度に変更される。
ところが、前述した巻付角度の低応答性のため、
一時的にΔTS＞ΔTSCRとなることがあり板形状不
良をおこす可能性がある。このことは第４図ｂに
示すように後行材が先行材に比べて薄い場合に特
に顕著である。 Therefore, as shown in Fig. 4a, if the relationship is (thickness of the preceding material of the strip <thickness of the succeeding material), or as shown in Fig. 4b, (thickness of the preceding material of the strip > thickness of the succeeding material). In any case, when the boundary part (weld part) between the preceding material and the succeeding material, which have different thicknesses, passes through the entrance of the cooling zone, the wrapping angle with respect to the succeeding material changes. changes will be made. In other words, as the plate thickness changes, the final cooling temperature of the succeeding material is cooled to within a predetermined tolerance range, and ΔT S ≦
The winding angle is changed to the value required to achieve ΔT SCR .
However, due to the low response of the winding angle mentioned above,
∆T S > ∆T SCR may temporarily occur, which may result in a defective plate shape. This is particularly noticeable when the trailing material is thinner than the leading material, as shown in FIG. 4b.
また、一旦ストリツプの形状が乱れると後続の
ストリツプに影響を及ぼし、ΔTS＜ΔTSCRとなつ
た後でもストリツプの形状を正常に戻すのは困難
で、最悪の場合には板われを起こす場合がある。 Additionally, once the strip shape is disturbed, it will affect the subsequent strips, and even after ΔT S < ΔT SCR , it is difficult to restore the strip shape to its normal shape, and in the worst case, it may cause plate breakage. be.
そこで、本発明はストリツプの板厚変更があつ
ても前述のΔTS≦ΔTSCRの関係を保持しストリツ
プの板形状不良や板切れを防止するようにした連
続焼鈍炉冷却帯の鋼帯冷却方法の提供を目的とす
る。 Therefore, the present invention proposes a steel strip cooling method for a continuous annealing furnace cooling zone, which maintains the above-mentioned relationship of ΔT S ≦ ΔT SCR even when the thickness of the strip changes, and prevents strip shape defects and strip breakage. The purpose is to provide.
かかる目的を達成する本発明は、内部に冷媒を
流通させた冷却ロールに鋼帯をかけ回し、鋼帯冷
却温度を変化する場合には上記冷却ロールを移動
して上記鋼帯と冷却ロールとの巻付角度を変える
ようにした連続焼鈍炉冷却帯において、上記鋼帯
の後行材の板厚が先行材の板厚より薄い場合に
は、上記後行材と先行材との境界部が上記冷却帯
の入口に至る時点よりも上記巻付角度の変更応答
時間分だけ前の時刻に上記巻付角度の設定替えを
開始することを特徴とする。 The present invention achieves this object by passing a steel strip around a cooling roll through which a refrigerant is circulated, and when changing the cooling temperature of the steel strip, moving the cooling roll to connect the steel strip and the cooling roll. In a continuous annealing furnace cooling zone in which the winding angle is changed, if the thickness of the trailing material of the steel strip is thinner than that of the leading material, the boundary between the trailing material and the leading material is The winding angle setting change is started at a time corresponding to the winding angle change response time before the time when the winding angle reaches the entrance of the cooling zone.
ここで、第５図および第６図を参照して本発明
の実施例を説明する。第５図は実施例方法のため
の設備である。冷却ロール５，３のロール駆動装
置７，８は、ロール位置検出器９，１０で得たロ
ール位置から巻付角度を計算しかつこの巻付角度
が入力される巻付角度の設定値ａになるよう作動
する巻付角度制御装置１１，１２により制御され
る。したがつて、ロール駆動装置７，８は巻付角
度制御装置１１，１２の指令に基づき駆動されロ
ール５，３を移動させるものである。 An embodiment of the present invention will now be described with reference to FIGS. 5 and 6. FIG. 5 shows the equipment for the example method. The roll driving devices 7 and 8 for the cooling rolls 5 and 3 calculate the winding angle from the roll positions obtained by the roll position detectors 9 and 10, and set the winding angle set value a to which this winding angle is input. It is controlled by winding angle control devices 11 and 12 that operate so that Therefore, the roll drive devices 7 and 8 are driven based on commands from the winding angle control devices 11 and 12 to move the rolls 5 and 3.
巻付角度の設定値ａは演算装置１３から出力さ
れるが、この演算装置１３ではストリツプ長LT、
板厚、ライン速度、目標ヒートサイクルが入力さ
れ、これから所要の巻付角度を演算し所要のタイ
ミングにて演算結果である設定値ａが出力され
る。 The set value a of the winding angle is output from the calculation device 13, and this calculation device 13 calculates the strip length L T ,
The plate thickness, line speed, and target heat cycle are input, the required winding angle is calculated from these, and the set value a, which is the calculation result, is output at the required timing.
加熱帯Ａの入口にはデフレクタロール１４が配
置され、このデフレクタロール１４の軸にはパル
スジエネレータ１５が取付けられ、このパルスジ
エネレータ１５に接続されたパルスカウンタ１６
にて回転数の計数が行なわれる。パルスカウンタ
１６には境界部（溶接点）の通過でリセツト信号
が出力される境界部検出器１７が接続されるの
で、パルスカウンタ１６の計数値によつて回転数
に比例したストリツプ長LTが得られる。 A deflector roll 14 is disposed at the entrance of the heating zone A, a pulse generator 15 is attached to the shaft of the deflector roll 14, and a pulse counter 16 is connected to the pulse generator 15.
The number of rotations is counted. Since the pulse counter 16 is connected to a boundary detector 17 which outputs a reset signal when the boundary (welding point) is passed, the count value of the pulse counter 16 determines the strip length L T which is proportional to the rotation speed. can get.
更に、加熱帯Ａにはライン速度検出器１８が配
置される。このライン速度検出器１８の速度信号
と先行材のストリツプ長LTとが演算装置１３に
て次式により処理され境界部が冷却帯入口を通過
するタイミングが得られる。 Furthermore, a line speed detector 18 is arranged in the heating zone A. The speed signal from the line speed detector 18 and the strip length L T of the preceding material are processed by the following equation in the arithmetic unit 13 to obtain the timing at which the boundary passes through the cooling zone inlet.
ΔL＝LO−LT
LT≧LCのとき、
ΔT＝ΔL／Ｖ＋LC／Ｖ
LT＜LCのとき、
ΔT＝Lc／Ｖ−LT／Ｖ
ここで、ΔL：境界部検出器の位置での先行材
の残長、
LO：先行材の全長
LT：先行材が境界部検出器を通過し
た分のストリツプ長さ、
LC：境界部検出器から冷却帯入口ま
での距離、
ΔT：次の境界部が冷却帯入口を通過
するまでの時間、
Ｖ：ライン速度である。 When ΔL=L O −L T L T ≧L C , ΔT=ΔL/V+L C /V When L T <L C , ΔT=L c /V−L T /V Where, ΔL: Boundary detection Remaining length of the preceding material at the position of the cooling zone, L O : Total length of the preceding material L T : Strip length of the preceding material passing through the boundary detector, L C : Strip length from the boundary detector to the cooling zone inlet Distance, ΔT: Time until the next boundary passes through the cooling zone entrance, V: Line speed.
こうして、上記条件により境界部が冷却帯入口
に至る時間ΔTが決定される。 In this way, the time ΔT for the boundary portion to reach the cooling zone entrance is determined by the above conditions.
また、巻付角度の応答時間は予め実験などによ
つて得ておき、演算装置１３内に記憶しておけば
よい。 Further, the response time of the winding angle may be obtained in advance through experiments or the like and stored in the arithmetic unit 13.
第６図は冷却帯最終冷却温度と巻付角度の時間
応答である。第６図ａは後行材の板厚＞先行材の
板厚の場合を示しており、この場合は冷却帯出口
にストリツプの境界部が至ると巻付角度設定値が
変更され、この時点から巻付角度が変化を開始す
る。したがつて、冷却帯出口にストリツプの境界
部が至つた時点ではストリツプ温度は、その板厚
により冷却しにくくなり、このためストリツプ温
度は上昇する。よつて、ストリツプの温度降下量
は、第６図ａの末図にて示すように低下する。か
かる場合には、前述のΔTS≦TSCRの関係が保持さ
れ、問題はない。 FIG. 6 shows the time response of the final cooling temperature of the cooling zone and the winding angle. Figure 6a shows the case where the plate thickness of the succeeding material is greater than the plate thickness of the preceding material. In this case, when the boundary of the strip reaches the cooling zone outlet, the winding angle setting value is changed, and from this point on, the winding angle setting value is changed. The wrapping angle starts to change. Therefore, when the boundary of the strip reaches the exit of the cooling zone, the strip temperature becomes difficult to cool due to the thickness of the strip, and therefore the strip temperature increases. Therefore, the amount of temperature drop in the strip decreases as shown in the last diagram of FIG. 6a. In such a case, the above-mentioned relationship ΔT S ≦T SCR is maintained and there is no problem.
一方、第６図ｂは後行材の板厚＜先行材の板厚
の場合を示す。すなわち、後行材の板厚が先行材
の板厚より薄い場合には、後行材と先行材との境
界部が冷却帯の入口に至る時点より、巻付角度を
変更する応答時間分だけ前の時刻にて巻付角度の
設定替えを行なつている。この設定替えの時刻は
前述した冷却帯入口に境界部が至る時間ΔTを巻
付角度を変更させる応答時間に相応させている。
この結果、境界部が冷却帯入口に至るときには、
後行材の板厚に応じた巻付角度が得られるため、
ストリツプ温度降下量ΔTSが上限値ΔTSCRより多
くなることがない。よつて、ΔTS≦ΔTSCRの関係
が保持される。 On the other hand, FIG. 6b shows a case where the thickness of the succeeding material<thickness of the preceding material. In other words, if the plate thickness of the trailing material is thinner than that of the preceding material, from the point at which the boundary between the trailing material and the preceding material reaches the entrance of the cooling zone, the winding angle is changed by the response time. The winding angle setting was changed at the previous time. The time for this setting change is such that the time ΔT for the boundary portion to reach the cooling zone inlet described above corresponds to the response time for changing the winding angle.
As a result, when the boundary reaches the cooling zone inlet,
Since the wrapping angle can be obtained according to the thickness of the trailing material,
The strip temperature drop amount ΔT S never exceeds the upper limit value ΔT SCR . Therefore, the relationship ΔT S ≦ΔT SCR is maintained.
以上説明したように本発明によれば、ストリツ
プの後行材の板厚が先行材の板厚より厚い場合は
もちろん、後行材の板厚が先行材の板厚より薄い
場合にも、巻付角度の応答時間を予めみこしてス
トリツプ温度降下量ΔTSを上限値ΔTSCRよりも大
きくならないように巻付角度の設定替えを行なう
ようにしたため、ストリツプの板形状不良や最悪
の場合の板切れを引起こすのを防止できて安定な
焼鈍運転が可能となつた。 As explained above, according to the present invention, not only when the thickness of the trailing material of the strip is thicker than the thickness of the preceding material, but also when the thickness of the trailing material is thinner than the thickness of the preceding material, the winding can be performed. The response time of the winding angle is taken into account in advance and the winding angle setting is changed so that the strip temperature drop ΔT S does not become larger than the upper limit value ΔT SCR . This enabled stable annealing operation by preventing this from occurring.
第１図は連続焼鈍設備の一例を示す構成図、第
２図は連続焼鈍炉で熱処理する場合のヒートサイ
クルを示すグラフ、第３図は冷却ロールを用いた
連続焼鈍炉冷却帯の設備例を示す構成図、第４図
は従来のストリツプ冷却の一例の時間応答例で、
ａは後行材の板厚が先行材の板厚より厚い場合、
ｂは後行材の板厚が先行材の板厚より薄い場合を
それぞれ示すタイムチヤート、第５図は本発明方
法の一実施例のための説明に供する設備構成図、
第６図は本発明の鋼帯冷却方法の一例の時間応答
例で、ａは後行材の板厚が先行材の板厚より厚い
場合、ｂは後行材の板厚が先行材の板厚より薄い
場合をそれぞれ示すタイムチヤートである。
図面中、１はストリツプ、２，３，４，５，６
は冷却ロール、７，８はロール駆動装置、９，１
０はロール位置検出器、１１，１２は巻付角度制
御装置、１３は演算装置、１４はデフレクタロー
ル、１５はパルスジエネレータ、１６はパルスカ
ウンタ、１７は境界部検出器、１８はライン速度
検出器、ａは巻付角度の設定値、Ａは加熱帯、Ｂ
は均熱帯、Ｃは第１冷却帯、Ｄは過時効帯、Ｅは
第２冷却帯、ΔTSはストリツプ温度降下量、
ΔTSCRは上限値である。
Figure 1 is a configuration diagram showing an example of continuous annealing equipment, Figure 2 is a graph showing a heat cycle when heat treatment is performed in a continuous annealing furnace, and Figure 3 is an example of equipment for a continuous annealing furnace cooling zone using cooling rolls. The configuration diagram shown in Figure 4 is an example of the time response of an example of conventional strip cooling.
a is when the thickness of the succeeding material is thicker than that of the preceding material,
b is a time chart showing the case where the thickness of the succeeding material is thinner than that of the preceding material, FIG. 5 is an equipment configuration diagram for explaining one embodiment of the method of the present invention,
FIG. 6 shows an example of the time response of an example of the steel strip cooling method of the present invention, in which a shows a case where the thickness of the succeeding material is thicker than that of the preceding material, and b shows a case where the thickness of the succeeding material is greater than that of the preceding material. This is a time chart showing the cases where the thickness is thinner than the thickness. In the drawing, 1 is a strip, 2, 3, 4, 5, 6
is a cooling roll, 7 and 8 are roll drive devices, and 9 and 1 are
0 is a roll position detector, 11 and 12 are winding angle control devices, 13 is a calculation device, 14 is a deflector roll, 15 is a pulse generator, 16 is a pulse counter, 17 is a boundary detector, 18 is a line speed detector A is the setting value of the wrapping angle, A is the heating zone, B
is the soaking zone, C is the first cooling zone, D is the overaging zone, E is the second cooling zone, ΔTS is the strip temperature drop,
ΔT SCR is the upper limit value.
Claims (1)
かけ回し、鋼帯冷却温度を変化する場合には上記
冷却ロールを移動して上記鋼帯と冷却ロールとの
巻付角度を変えるようにした連続焼鈍炉冷却帯に
おいて、上記鋼帯の後行材の板厚が先行材の板厚
より薄い場合には、上記後行材と先行材との境界
部が上記冷却帯の入口に至る時点よりも上記巻付
角度の変更応答時間分だけ前の時刻に上記巻付角
度の設定替えを開始することを特徴とする連続焼
鈍炉冷却帯の鋼帯冷却方法。1. A steel strip is wound around a cooling roll through which a refrigerant is circulated, and when changing the cooling temperature of the steel strip, the cooling roll is moved to change the wrapping angle between the steel strip and the cooling roll. In the continuous annealing furnace cooling zone, if the thickness of the trailing material of the steel strip is thinner than the thickness of the preceding material, from the point at which the boundary between the trailing material and the preceding material reaches the entrance of the cooling zone. A method for cooling a steel strip in a continuous annealing furnace cooling zone, characterized in that changing the setting of the winding angle is started at a time just before the winding angle change response time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2524584A JPS60169525A (en) | 1984-02-15 | 1984-02-15 | Method for cooling steel strip in cooling zone of continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2524584A JPS60169525A (en) | 1984-02-15 | 1984-02-15 | Method for cooling steel strip in cooling zone of continuous annealing furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60169525A JPS60169525A (en) | 1985-09-03 |
| JPS6337170B2 true JPS6337170B2 (en) | 1988-07-25 |
Family
ID=12160597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2524584A Granted JPS60169525A (en) | 1984-02-15 | 1984-02-15 | Method for cooling steel strip in cooling zone of continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60169525A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2469102C2 (en) | 2007-02-23 | 2012-12-10 | Тата Стил Эймейден Б.В. | Method of thermomechanical shaping of finished product with very high strength, and product produced in such way |
| EP2171102B1 (en) * | 2007-07-19 | 2017-09-13 | Muhr und Bender KG | A strip of steel having a variable thickness in length direction |
| PL2171104T3 (en) | 2007-07-19 | 2018-08-31 | Muhr Und Bender Kg | Method for annealing a strip of steel having a variable thickness in length direction |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5015712A (en) * | 1973-06-15 | 1975-02-19 | ||
| JPS5186009A (en) * | 1975-01-27 | 1976-07-28 | Chugai Ro Kogyo Kaisha Ltd | KINZOKUSUTORITSUPURENZOKUSHODONRONIOKERUONDOSEIGYOHOHO |
| JPS5229410A (en) * | 1975-08-30 | 1977-03-05 | Nippon Kokan Kk <Nkk> | Temperature controlling method for continuous annealing and heating ap paratus |
| JPS5228412A (en) * | 1975-08-30 | 1977-03-03 | Nippon Kokan Kk <Nkk> | Temperature control method in continuous annealing furnaces at the cha nging of heating conditions |
| JPS5830376B2 (en) * | 1976-06-11 | 1983-06-29 | 日本鋼管株式会社 | Control method of continuous annealing furnace |
| JPS5826416B2 (en) * | 1977-04-20 | 1983-06-02 | 日本鋼管株式会社 | Forced convection cooling control method |
| JPS5723036A (en) * | 1980-07-18 | 1982-02-06 | Mitsubishi Heavy Ind Ltd | Method for cooling steel plate |
| JPS5847457A (en) * | 1981-09-16 | 1983-03-19 | Mitsubishi Acetate Co Ltd | Method for coagulating soya milk |
| JPS5896824A (en) * | 1981-12-03 | 1983-06-09 | Nippon Kokan Kk <Nkk> | Method for cooling strips using cooling rolls in continuous annealing equipment |
| JPS599130A (en) * | 1982-07-08 | 1984-01-18 | Kawasaki Steel Corp | Roll cooling method of steel strip |
| JPS5920426A (en) * | 1982-07-27 | 1984-02-02 | Nippon Kokan Kk <Nkk> | Method for controlling temperature of plate in continuous annealing installation |
| JPS5923826A (en) * | 1982-07-28 | 1984-02-07 | Mitsubishi Heavy Ind Ltd | Cooling method of metallic strip by cooling roll |
-
1984
- 1984-02-15 JP JP2524584A patent/JPS60169525A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60169525A (en) | 1985-09-03 |
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