JPH03193824A - Method for executing continuous annealing and descaling - Google Patents
Method for executing continuous annealing and descalingInfo
- Publication number
- JPH03193824A JPH03193824A JP33102389A JP33102389A JPH03193824A JP H03193824 A JPH03193824 A JP H03193824A JP 33102389 A JP33102389 A JP 33102389A JP 33102389 A JP33102389 A JP 33102389A JP H03193824 A JPH03193824 A JP H03193824A
- Authority
- JP
- Japan
- Prior art keywords
- strip
- furnace
- annealing
- annealing furnace
- descaling
- 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.)
- Granted
Links
- 238000000137 annealing Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000007935 neutral effect Effects 0.000 abstract description 4
- 150000003839 salts Chemical class 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 239000003792 electrolyte Substances 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N hydrofluoric acid Substances F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は鉄或いはステンレス等のストリップの連続焼鈍
・脱スケール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 continuous annealing and descaling method for strips of iron, stainless steel, etc.
[従来の技術]
従来、鉄或いはステン、レス等のストリップを焼鈍炉で
焼鈍した後、焼鈍の際にストリップの表面に形成された
スケール(酸化物被膜)を酸又は中性塩浴中で電解法に
より脱スケールを行なう、所謂連続焼鈍・脱スケール装
置においては、通常ストリップは焼鈍炉内で800℃〜
1150℃程度に加熱されて伸びたり、蛇行したりする
ため、焼鈍炉内でのストリップのカテナリ(垂み)を一
定に保つように焼鈍炉の入側と出側に夫々ブライドルロ
ールを設け、該ロール間のストリップに常時一定の張力
を付与するようにブライドルロールを張力制御している
。[Prior Art] Conventionally, after annealing a strip of iron, stainless steel, stainless steel, etc. in an annealing furnace, the scale (oxide film) formed on the surface of the strip during annealing is electrolyzed in an acid or neutral salt bath. In so-called continuous annealing/descaling equipment, which descales by a method, the strip is usually heated at 800°C to 800°C in an annealing furnace.
Because the strip stretches and meanderes when heated to about 1150°C, bridle rolls are installed on the entrance and exit sides of the annealing furnace to keep the catenary (sagging) of the strip constant in the annealing furnace. The tension of the bridle rolls is controlled so that a constant tension is always applied to the strip between the rolls.
[発明が解決しようとする課題]
従来、焼鈍炉内のストリップは該炉の入側と出側に設け
たブライドルロールによって張力が一定となるように張
力制御されているが、設定張力が小さいと加熱による伸
びを完全に吸収できず、炉内で垂んだり蛇行したりする
ため焼鈍作業に支障をきたすおそれがあると共に、焼鈍
後のストリップの形状が悪く後段の電解脱スケール装置
の電極間隔を広くとらないと脱スケール装置内での円滑
なストリップの通過が図れないため、電源装置の容量を
大きくしなければならないと共に、消費電力も多くなる
等の不具合があった。[Problems to be Solved by the Invention] Conventionally, the tension of the strip in an annealing furnace is controlled by bridle rolls provided at the entrance and exit sides of the furnace so that the tension is constant, but if the set tension is small, The elongation caused by heating cannot be completely absorbed, causing the strip to sag or meander in the furnace, which may impede the annealing process.In addition, the shape of the strip after annealing may be poor and the spacing between the electrodes of the subsequent electrolytic descaling device may be affected. If the strip is not wide enough, the strip cannot pass through the descaling device smoothly, so the capacity of the power supply device must be increased, and there are problems such as increased power consumption.
一方、前記の不具合を解決すべく設定張力を大きくする
と焼鈍炉内で生じるクリープ現象による塑性伸びがスト
リップの幅方向の縮みを引起し、ストリップの幅が不均
一となるため所定のストリップ幅を得るためには相当幅
に余裕を持ったストリップを焼鈍炉に供給しなければな
らず材料の無駄が多く、製品の歩留りが悪い等、いずれ
にしても十分満足のいく結果は得られていなかった。On the other hand, if the set tension is increased to solve the above problem, the plastic elongation due to the creep phenomenon that occurs in the annealing furnace will cause the strip to shrink in the width direction, making the strip width uneven, so that it is difficult to obtain the desired strip width. In order to achieve this, it is necessary to feed a strip with a considerable width margin to the annealing furnace, resulting in a lot of wasted material and poor product yield, so that in any case, fully satisfactory results have not been obtained.
[課題を解決するための手段]
本発明によれば、焼鈍炉と、該炉の後段に設けた電解脱
スケール装置とを有する連続焼鈍・脱スケール装置にお
いて、焼鈍炉の入側と出側に夫々ブライドルロールを設
けると共に、入側ブライドルロールと出側ブライドルロ
ールを焼鈍炉内におけるストリップの伸び率が一定とな
るように速度制御することにより、ストリップの長手方
向の伸び率及び幅方向の縮み量が一定で焼鈍炉内でスト
リップに垂みや蛇行を生じさせることもない連続焼鈍・
脱スケール方法が得られる。[Means for Solving the Problems] According to the present invention, in a continuous annealing/descaling apparatus having an annealing furnace and an electrolytic descaling device provided at the rear stage of the annealing furnace, By providing a bridle roll for each and controlling the speed of the inlet bridle roll and the outlet bridle roll so that the elongation rate of the strip in the annealing furnace is constant, the elongation rate in the longitudinal direction and the amount of shrinkage in the width direction of the strip can be controlled. Continuous annealing with a constant temperature and no sagging or meandering of the strip in the annealing furnace.
A descaling method is obtained.
[実施例] 以下、本発明の一実施例を説明する。[Example] An embodiment of the present invention will be described below.
図は、本発明を実施した連続焼鈍・脱スケール装置の概
略を示すものである。The figure schematically shows a continuous annealing/descaling apparatus in which the present invention is implemented.
図において、1は焼鈍炉、2,2′は冷却装置、3は焼
鈍炉1の入側に設けた入側ブライドルロール、4は焼鈍
炉(冷却装置)1の出側に設けた出側ブライドルロール
である。In the figure, 1 is an annealing furnace, 2 and 2' are cooling devices, 3 is an entry bridle roll provided on the entry side of the annealing furnace 1, and 4 is an exit bridle provided on the exit side of the annealing furnace (cooling device) 1. It's a roll.
6.6′は脱スケール装置で、本実施例では前記焼鈍炉
1の後段に中性塩電解装置6と酸性液電解装置6′が直
列に2組設けられている。Reference numeral 6.6' denotes a descaling device, and in this embodiment, two sets of a neutral salt electrolyzer 6 and an acidic liquid electrolyzer 6' are provided in series downstream of the annealing furnace 1.
この脱スケール装置6,6′は浴槽7.7′に中性塩或
いは酸液等の電解液を充填すると共に、該電解液に浸る
ように電極8,8′を夫々対向して設け、これらの間に
前記焼鈍炉1で焼鈍した鉄或いはステンレス等のストリ
ップ10を連続して挿通し、焼鈍の際にストリップ10
の表面に形成されたスケール(酸化物被膜)を電解して
分離するようになっている。These descaling devices 6, 6' are constructed by filling a bath 7, 7' with an electrolytic solution such as a neutral salt or acid solution, and installing electrodes 8, 8' facing each other so as to be immersed in the electrolytic solution. During the annealing, a strip 10 of iron or stainless steel annealed in the annealing furnace 1 is continuously inserted.
The scale (oxide film) formed on the surface is separated by electrolysis.
11.11’、12.12’は入側ガイドロール、13
.13’ 14.14’は出側ガイドロールである。11.11', 12.12' are entrance guide rolls, 13
.. 13' 14. 14' is an exit guide roll.
15.15’は夫々前記脱スケール装置6゜6′の出側
に設けたブラシロールユニットで、脱スケール装置6.
6′で処理されたストリップ10の表面のスケールを払
い落すためのものである。Reference numerals 15 and 15' denote brush roll units installed on the outlet side of the descaling devices 6 and 6', respectively.
This is to remove scale on the surface of the strip 10 treated in step 6'.
なお、前記脱スケール装置6.6′は実施例に示した2
組に限定されるものではなく、1組成いは必要に応じて
3組以上設けても良いことは言うまでもない。Note that the descaling device 6.6' is the same as the 2 shown in the embodiment.
It goes without saying that the number of sets is not limited, and one composition may be provided with three or more sets as necessary.
16は酸洗装置で、硝フッ酸液等により、前記脱スケー
ル装置6.6′により処理したストリップ10の表面を
化学的に仕上げ処理するものである。Reference numeral 16 denotes a pickling device for chemically finishing the surface of the strip 10 treated by the descaling device 6.6' using a nitric-hydrofluoric acid solution or the like.
なお、この酸洗装置16は脱スケール装置による処理で
十分であれば必ずしも設ける必要がないことは言うまで
もない。It goes without saying that this pickling device 16 does not necessarily need to be provided if treatment by a descaling device is sufficient.
本発明は前記の如き構成の連続焼鈍・脱スケール装置の
焼鈍炉1の入側と出側に夫々設けたブライドルロール3
.4の相対速度を制御することによってブライドルロー
ル3,4間、即ち、焼鈍炉1内のストリップ10に予め
設定した一定の伸び率を付与する。The present invention provides bridle rolls 3 provided at the entrance and exit sides of the annealing furnace 1 of the continuous annealing/descaling apparatus configured as described above.
.. By controlling the relative speed of the bridle rolls 3 and 4, a preset constant elongation rate is imparted to the strip 10 between the bridle rolls 3 and 4, that is, in the annealing furnace 1.
即ち、入側ブライドルロール3の回転数(周速)をnl
、出側ブライドルロール4の回転数(周速)naとした
時、伸び率ε、を次式で導びかれるストリップ10の材
質に応じた最適の伸び率となるように制御する。That is, the number of rotations (peripheral speed) of the entry side bridle roll 3 is nl
, when the rotational speed (peripheral speed) of the exit bridle roll 4 is na, the elongation rate ε is controlled to be the optimum elongation rate according to the material of the strip 10 derived from the following equation.
この伸び率は、ストリップ10に引張り矯正効果が与え
られ焼鈍後のストリップ10が高い平坦度を有する値(
0,2〜1.0%)を選定する。This elongation rate is a value (
0.2 to 1.0%).
なお、前記ブライドルロールの速度制御に際しては、入
側ブライドルロール3又は出側ブライドルロール4のい
ずれか一方を、焼鈍炉1及び脱スケール装置6.6′の
速度基準に合せて他方をそれより速くするか又は遅くす
るように制御する。In addition, when controlling the speed of the bridle roll, either one of the entry side bridle roll 3 or the exit side bridle roll 4 is adjusted to a speed standard of the annealing furnace 1 and the descaling device 6, 6', and the other is set faster than that. control to speed up or slow down.
このようにして、ストリップ10の伸び率(長手方向の
)を一定に制御することにより、ストリップの幅方向の
縮み量εCは、入側の幅をbo+出側の幅をblとした
時、
=1−()r+1
1−ε。In this way, by controlling the elongation rate (longitudinal direction) of the strip 10 to be constant, the shrinkage amount εC of the strip in the width direction is calculated as follows: where the input side width is bo + the output side width is bl. 1-()r+1 1-ε.
(但し、r=ランクフォード値) の式で導き出される。(However, r = Lankford value) It is derived by the formula.
従って、予めストリップ10の長手方向の伸び率が解か
れば、それに応じた幅方向の縮み量も解かるので、製品
ストリップ幅に予め縮み量を加算して素材ストリップ幅
を選定することにより材料の無駄がなくなる。Therefore, if the elongation rate of the strip 10 in the longitudinal direction is determined in advance, the corresponding amount of shrinkage in the width direction can also be determined. There will be no waste.
また、焼鈍されたストリップ10は、塑性伸びが与えら
れ、所謂引張り矯正による高い平坦度が得られるので、
電解脱スケール装置6゜6′の電極間隔を狭くしてもス
トリップ10をスムースに挿通できる。Further, the annealed strip 10 is given plastic elongation and high flatness is obtained by so-called tensile straightening.
Even if the electrode spacing of the electrolytic descaling device 6°6' is narrowed, the strip 10 can be inserted smoothly.
従って、電極間隔りと通電時の抵抗電圧ECは次式で示
す如く比例する。Therefore, the electrode spacing and the resistance voltage EC when energized are proportional as shown by the following equation.
よって、電極間距離を狭くすることにより、電解電圧が
低下し、脱スケールに必要な電流を流した場合、消費電
力も低減できることになる。Therefore, by narrowing the distance between the electrodes, the electrolytic voltage is reduced, and when the current necessary for descaling is passed, power consumption can also be reduced.
[発明の効果]
本発明によれば、ストリップを焼鈍する際に該ストリッ
プの長手方向の伸び率が一定になるように制御すること
により、ストリップの幅方向の縮み量も一定に保つこと
が可能となり、予め、ストリップの幅方向の縮み量を見
越して材料ストリップ幅を選定することにより、製品の
歩留りが向上すると共に、材料に応じた最適な伸び率を
任意に与えることができるから、ストリップに十分な塑
性伸びを与えて引張り矯正による高い平坦度が得られる
ので、電解脱スケール装置の電極間距離を狭くすること
が可能となり、電解電力の省エネルギー化も図れる等の
効果を有する。[Effects of the Invention] According to the present invention, by controlling the elongation rate in the longitudinal direction of the strip to be constant when annealing the strip, it is possible to keep the amount of shrinkage of the strip constant in the width direction. Therefore, by selecting the material strip width in advance by anticipating the amount of shrinkage in the width direction of the strip, the yield of the product can be improved, and the optimum elongation rate can be arbitrarily given to the material. Since high flatness can be obtained by applying sufficient plastic elongation and tensile straightening, it becomes possible to narrow the distance between the electrodes of the electrolytic descaling device, and it has effects such as saving energy in electrolytic power.
図は本発明を実施した連続焼鈍・脱スケール装置の概略
図である。
1・・・焼鈍炉 3・・・入側ブライドルロール4
・・・出側ブライドルロール
6.6′・・・電解脱スケール装置The figure is a schematic diagram of a continuous annealing/descaling apparatus in which the present invention is implemented. 1... Annealing furnace 3... Entry side bridle roll 4
...Output bridle roll 6.6'...Electrolytic descaling device
Claims (1)
を有する連続焼鈍・脱スケール装置において、焼鈍炉の
入側と出側に夫々ブライドルロールを設けると共に、入
側ブライドルロールと出側ブライドルロールを焼鈍炉内
におけるストリップの伸び率が一定となるように速度制
御することを特徴とする連続焼鈍・脱スケール方法。1) In a continuous annealing/descaling device that has an annealing furnace and an electrolytic descaling device installed at the rear stage of the furnace, bridle rolls are provided on the entrance and exit sides of the annealing furnace, and the entrance bridle roll and the exit side A continuous annealing/descaling method characterized by controlling the speed of a bridle roll in an annealing furnace so that the elongation rate of the strip is constant.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1331023A JP2787720B2 (en) | 1989-12-22 | 1989-12-22 | Continuous annealing / descaling method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1331023A JP2787720B2 (en) | 1989-12-22 | 1989-12-22 | Continuous annealing / descaling method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03193824A true JPH03193824A (en) | 1991-08-23 |
JP2787720B2 JP2787720B2 (en) | 1998-08-20 |
Family
ID=18238961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1331023A Expired - Lifetime JP2787720B2 (en) | 1989-12-22 | 1989-12-22 | Continuous annealing / descaling method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2787720B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013124415A (en) * | 2011-12-16 | 2013-06-24 | Ihi Corp | Device and method for heat treatment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60177137A (en) * | 1984-02-22 | 1985-09-11 | Nisshin Steel Co Ltd | Annealing and pickling installation for stainless steel strip |
JPS6233011U (en) * | 1985-08-13 | 1987-02-27 | ||
JPS63161198A (en) * | 1986-12-24 | 1988-07-04 | Mitsubishi Heavy Ind Ltd | Equipment for electrolytically cleaning band steel |
-
1989
- 1989-12-22 JP JP1331023A patent/JP2787720B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60177137A (en) * | 1984-02-22 | 1985-09-11 | Nisshin Steel Co Ltd | Annealing and pickling installation for stainless steel strip |
JPS6233011U (en) * | 1985-08-13 | 1987-02-27 | ||
JPS63161198A (en) * | 1986-12-24 | 1988-07-04 | Mitsubishi Heavy Ind Ltd | Equipment for electrolytically cleaning band steel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013124415A (en) * | 2011-12-16 | 2013-06-24 | Ihi Corp | Device and method for heat treatment |
Also Published As
Publication number | Publication date |
---|---|
JP2787720B2 (en) | 1998-08-20 |
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