JP2960195B2 - Descaling control method for steel strip - Google Patents
Descaling control method for steel stripInfo
- Publication number
- JP2960195B2 JP2960195B2 JP9239191A JP9239191A JP2960195B2 JP 2960195 B2 JP2960195 B2 JP 2960195B2 JP 9239191 A JP9239191 A JP 9239191A JP 9239191 A JP9239191 A JP 9239191A JP 2960195 B2 JP2960195 B2 JP 2960195B2
- Authority
- JP
- Japan
- Prior art keywords
- pickling
- steel strip
- bubbles
- tank
- scale
- 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 - Lifetime
Links
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は金属材料、特に鋼帯のス
ケールを高速に酸洗除去する方法に係わり、熱延鋼帯の
酸洗に限らず例えば電気めっきや電解洗浄等の前処理手
段に適用可能な連続酸洗方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rapidly pickling and removing scales of a metal material, particularly a steel strip, and is not limited to pickling of a hot-rolled steel strip, but includes pretreatment means such as electroplating and electrolytic cleaning. The present invention relates to a continuous pickling method applicable to the present invention.
【０００２】[0002]
【従来の技術】従来の連続酸洗装置の一例を図４に示
す。図４において１は鋼帯、２は酸洗槽、３は酸洗液、
４ａ，４ｂ，４ｃ，４ｄ，４ｅはガイドロールで鋼帯１
を案内通板する。概略は、常温の鋼帯１が図示しないペ
イオフリールから捲き出された後、酸洗槽２内の酸液３
に浸りながら走行する間に鋼帯表面に生成していたスケ
ールが酸液３により酸洗されて除去され、脱スケールさ
れた鋼帯１が酸洗槽２より出て、図示しない後工程に供
給されるというものである。2. Description of the Related Art FIG. 4 shows an example of a conventional continuous pickling apparatus. In FIG. 4, 1 is a steel strip, 2 is a pickling tank, 3 is a pickling solution,
4a, 4b, 4c, 4d, and 4e are guide rolls and steel strip 1
Through the guide. Briefly, after the steel strip 1 at normal temperature is unwound from a pay-off reel (not shown), the acid solution 3 in the pickling tank 2 is removed.
The scale formed on the surface of the steel strip during running while immersed in the steel strip is pickled with an acid solution 3 and removed, and the descaled steel strip 1 comes out of the pickling tank 2 and is supplied to a post-process (not shown). Is to be done.
【０００３】前述の連続酸洗装置では、スケールを除去
するという目的を達成するために鋼帯１の表面が、酸洗
液３と一定時間接触していることが必要である。これに
ついては酸洗装置の耐熱耐食性あるいはランニングコス
トのことを考えて、これまで１０〜１５％濃度で約８０
℃程度の塩酸、硫酸が一般に使われていた。In the above-mentioned continuous pickling apparatus, the surface of the steel strip 1 needs to be in contact with the pickling liquid 3 for a certain time in order to achieve the purpose of removing scale. Considering the heat resistance and corrosion resistance of the pickling apparatus or the running cost, about 10 to 15% concentration and about 80%
Hydrochloric acid and sulfuric acid at about ° C were commonly used.
【０００４】このため、通板スピードを速くすると酸液
槽を長くしなければならず、設備費の高額化、設備スペ
ースの長大化、処理酸液の増大化が必要となる問題が生
じる。かかることから、酸洗設備のコンパクト化や、ま
た最近増産傾向にある難酸洗材、例えばステンレス鋼な
どの酸洗処理に対応するため、高い酸洗能力を有する設
備の必要性が高まっている。[0004] For this reason, if the passing speed is increased, the acid solution tank must be lengthened, which causes a problem that the equipment cost is increased, the equipment space is lengthened, and the treatment acid solution is required to be increased. For this reason, there is an increasing need for equipment having a high pickling ability in order to reduce the size of the pickling equipment and to cope with pickling treatment of hard-to-pick materials, such as stainless steel, which have recently been increasing in production. .
【０００５】酸洗能力向上の一手段として、例えば特開
昭６０−６１１１２号公報にはスケールブレーカで鋼帯
のスケールに引っ張り曲げ歪みを与えて微細クラックを
入れ、次いで狭めた酸洗液路に鋼帯を通板して酸洗液と
高速にて接触させ酸洗する方法が提案されている。As one means for improving the pickling ability, for example, Japanese Patent Application Laid-Open No. 61-11212 discloses that a scale breaker applies tensile bending strain to the scale of a steel strip to form fine cracks, and then to a narrowed pickling liquid passage. A method has been proposed in which a steel strip is passed through a steel strip and brought into contact with a pickling solution at a high speed to perform pickling.
【０００６】また、特開昭６１−４１７８３号公報には
酸洗槽に狭い間隔で帯状帯を設けて鋼帯の通板路とし、
該通板路に酸洗液を供給し、乱流の薄い酸液層により酸
洗する方法が示されている。これらでは相応の作用効果
があるが、一方、次のような課題がある。In Japanese Patent Application Laid-Open No. 61-41783, strip belts are provided at narrow intervals in an acid pickling tank to provide a steel strip passing path.
There is shown a method in which an pickling solution is supplied to the passage plate and pickled by a thin turbulent acid solution layer. Although these have a corresponding effect, they have the following problems.
【０００７】[0007]
【発明が解決しようとする課題】実操業ラインで製造さ
れる鋼帯、例えば熱延鋼帯は側波や中伸びと称されるよ
うな必ずしも平坦でないものがある。また通板は生産性
確保の観点からできるだけ高速とすることが望ましい
が、通板時には板の上下振動は避けられず、狭い酸洗通
板路では鋼帯が通板路構成物に接触し疵や通板路損傷等
を生じるので、高速通板には限界がある。また、酸洗の
際は鋼帯表面に酸液境界層が生じて反応速度が高まらな
いことがある。Some steel strips produced on actual production lines, for example, hot-rolled steel strips, are not always flat, such as side waves and medium elongation. In addition, it is desirable to increase the speed of the sheet passing as much as possible from the viewpoint of securing productivity. And high-speed threading have a limit because they cause damage to the threading path and the like. In addition, in the case of pickling, an acid solution boundary layer may be formed on the surface of the steel strip, and the reaction rate may not be increased.
【０００８】これに対して、酸液の温度を沸点以上の高
温とし沸騰時に発生する気泡、または高温の蒸気やガス
を酸洗槽内に吹き込み気泡を発しせしめ、鋼帯表面の酸
液境界層を破壊して反応速度を高めることで、酸洗を短
時間化し、また被酸洗鋼帯の板形状に影響されずに脱ス
ケールの高速化を達成できることを知見した。On the other hand, when the temperature of the acid solution is set to a temperature higher than the boiling point, bubbles generated at the time of boiling, or high-temperature steam or gas is blown into the pickling tank to generate bubbles, thereby causing the acid solution boundary layer on the steel strip surface. It was found that by increasing the reaction rate by destroying the steel, it was possible to shorten the pickling time and to achieve a high-speed descaling without being affected by the plate shape of the steel strip to be pickled.
【０００９】この脱スケール法のさらなる高速化を図る
ために種々研究したところ、比較的スケール厚の厚い鋼
帯エッジ部分が鋼帯幅によってずれたり、また鋼帯によ
っては厚い領域が板幅方向のセンターにあるものもあ
り、これらの酸洗に対応するために鋼帯内でスケール厚
の厚い領域を酸洗槽入側にてチェックし、酸洗槽内でそ
の領域に対し集中的に気泡を吐出させ境界層の破壊を活
発にし全体的な脱スケール能力を上げることができるこ
とを見出した。Various studies have been made to further increase the speed of the descaling method. As a result, the edges of the steel strip having a relatively large scale thickness are shifted depending on the width of the steel strip, and depending on the steel strip, a thick region is formed in the width direction of the steel strip. Some are located in the center, and in order to cope with these picklings, check the thick-scale area in the steel strip at the pickling tank entry side, and concentrate bubbles in that area in the pickling tank. It has been found that it is possible to increase the overall descaling ability by discharging and intensify the destruction of the boundary layer.
【００１０】本発明は、酸洗槽内の酸洗液を加熱し沸騰
させ気泡を発し、または高温の蒸気やガスを酸洗槽内に
吹き込み気泡を発生させた酸洗液中でスケールの酸洗除
去を行うにあたり、鋼帯幅方向でのスケール生成状況に
応じて加熱用蒸気、ガスの吹き込みを制御することによ
りスケール厚の厚い領域の脱スケール速度を速め、酸洗
時間の短時間化と被酸洗鋼帯の板形状に影響されること
ない安定した生産が行える方法を目的とする。According to the present invention, a pickling solution in a pickling tank is heated and boiled to generate air bubbles, or high-temperature steam or gas is blown into the pickling tank to generate scale bubbles in the pickling liquid. In performing the washing and removal, the descaling speed of the thick scale area is increased by controlling the blowing of heating steam and gas according to the scale generation state in the steel strip width direction, and the pickling time is shortened. It is an object of the present invention to provide a method capable of performing stable production without being affected by the shape of an acid-washed steel strip.
【００１１】[0011]
【課題を解決するための手段】本発明は、鋼帯のスケー
ルを連続的に酸洗するにあたり、鋼帯が通板する酸洗槽
内の酸洗液を加熱し沸騰させ気泡を発し、または高温の
蒸気やガスを酸洗槽内に吹き込み気泡を発生させた酸洗
液中でスケールを酸洗除去する方法において、酸洗槽床
面に鋼帯の幅方向に設けた酸洗液加熱装置の加熱作用ま
たは加熱用蒸気、ガス配管の気体吐出を鋼帯幅方向で変
え酸洗液中の気泡発生を制御し酸洗することを特徴とす
るデスケーリング方法にある。According to the present invention, in pickling a steel strip scale continuously, the pickling solution in a pickling tank through which the steel strip passes is heated and boiled to generate bubbles, or In a method in which high-temperature steam or gas is blown into the pickling tank to remove the scale by pickling in the pickling liquid that has generated bubbles, a pickling liquid heating device provided in the width direction of the steel strip on the floor of the pickling tank. A descaling method characterized by controlling the generation of bubbles in the pickling liquid by changing the heating action or the heating steam or the gas discharge of the gas pipe in the width direction of the steel strip to perform pickling.
【００１２】以下に本発明について一実施例に基づき図
面を参照して詳細に説明する。図１において、１は脱ス
ケールされる鋼帯、２は酸洗槽で３は酸洗液で例えば硫
酸、塩酸等が含有されている。４ａ，４ｂはガイドロー
ルで鋼帯１を酸洗液３に浸しながら通板させる。５は酸
洗槽２に設けられた酸洗液加熱管で、その管長さ方向で
加熱作用力が変えられるようになされていて、鋼帯１の
幅方向において気泡の吐出量が変えられる。Hereinafter, the present invention will be described in detail based on an embodiment with reference to the drawings. In FIG. 1, 1 is a steel strip to be descaled, 2 is a pickling tank, and 3 is a pickling liquid containing, for example, sulfuric acid and hydrochloric acid. 4a and 4b are guide rolls for passing the steel strip 1 while immersing it in the pickling liquid 3. Reference numeral 5 denotes a pickling liquid heating tube provided in the pickling tank 2 so that the heating action force can be changed in the length direction of the tube, and the discharge amount of bubbles in the width direction of the steel strip 1 can be changed.
【００１３】この実施例では例えば１００℃超の高温蒸
気を通して酸洗液を加熱し該酸洗液加熱管５の表面ある
いはその近傍から沸騰させ気泡を発生しその上方を通板
する鋼帯１に対してその幅方向のエッジ部に多く高温酸
洗液気泡を投じるようにしている。In this embodiment, for example, the pickling liquid is heated by passing high-temperature steam of more than 100 ° C. and boiled from or near the surface of the pickling liquid heating tube 5 to generate air bubbles, and the steel strip 1 passes above the pipe. On the other hand, a large amount of hot pickling liquid bubbles are blown to the edge portion in the width direction.
【００１４】酸洗液加熱管５の設置は鋼帯幅方向に平行
に酸洗槽床面に行い、鋼帯幅や鋼帯内スケール厚分布に
より、蒸気、ガスの吹き込みを制御しスケール厚の厚い
領域の境界層を沸騰気泡も含んだ酸洗槽気泡で積極的に
破壊できるものである。図２にその詳細を示す。The pickling liquid heating pipe 5 is installed on the floor of the pickling tank in parallel to the width direction of the steel strip, and by controlling the steam and gas injection according to the steel strip width and the scale thickness distribution in the steel strip, the scale thickness is adjusted. The boundary layer in the thick region can be positively destroyed by bubbles in the pickling tank including boiling bubbles. FIG. 2 shows the details.
【００１５】鋼帯１例えば熱延鋼帯は一般的に熱間圧延
後の捲取りまでにランアウトテーブル上を通板するため
に鋼帯内捲側はランアウトテーブルとの接触により外捲
側に比べて冷却速度が遅く、そのためスケールが外捲に
比べて厚く、また不均一厚みのスケールが発生しやす
い。また、捲取り後の冷却中の空気との接触で鋼帯エッ
ジ部はスケールが厚くなる。Steel strip 1, for example, a hot-rolled steel strip is generally passed through a run-out table before winding after hot rolling. As a result, the cooling rate is slow, so that the scale is thicker than the outer winding, and a scale having an uneven thickness is easily generated. In addition, the scale of the edge portion of the steel strip becomes thick due to contact with the air during cooling after winding.
【００１６】そこで、この実施例では酸洗液加熱管５か
らは図２に示すように鋼帯エッジ部に他より気泡を多く
吐出させ脱スケール作用をエッジ部で強めて酸洗する。
熱延鋼帯内捲側は作業性の面から一般に酸洗槽では下面
として通板するのが有利となるので、本発明により鋼帯
内捲のスケール厚分布に対して充分な酸洗が可能とな
る。Therefore, in this embodiment, as shown in FIG. 2, more bubbles are discharged from the pickling liquid heating pipe 5 to the edge of the steel strip than the others, and the descaling action is strengthened at the edge to perform pickling.
In general, it is advantageous to pass the inner side of the hot-rolled steel strip as the lower surface in the pickling tank from the viewpoint of workability. Therefore, according to the present invention, sufficient pickling can be performed on the scale thickness distribution of the inner strip of the steel strip. Becomes
【００１７】また本発明は、撹拌の効果を出すために沸
騰時の気泡あるいはガスの吹き込みによる気泡を利用し
ているため、狭い通板スペースに鋼帯を通板する必要が
なく、高速通板酸洗が可能となる。さらに脱スケールに
使用される一般の酸洗液の酸濃度では、沸点付近の温度
で鋼帯の不働態化の影響も純鉄からステンレス鋼等まで
の広い範囲にわたって生じることが妨げられるので安定
して連続酸洗処理が可能となる。Further, in the present invention, since a bubble at the time of boiling or a bubble generated by blowing gas is used to obtain the effect of stirring, there is no need to pass a steel strip through a narrow passage space, and high-speed passage is performed. Pickling becomes possible. Furthermore, the acid concentration of a general pickling solution used for descaling is stable because the effect of passivation of the steel strip at a temperature near the boiling point is prevented from occurring over a wide range from pure iron to stainless steel. This enables continuous pickling.
【００１８】[0018]
【実施例】熱延された後のクロム系ステンレス鋼帯の酸
洗を、Ｈ2 ＳＯ4 が１５％の酸洗液を酸洗槽に入れて、
本発明による鋼帯のエッジ部への気泡発生を高めた酸洗
と、比較例として同じ酸洗液を９０℃に加熱した従来の
酸洗を行った。この酸洗の結果、本発明では脱スケール
を効率的に行うことができ、コイル１０本処理する平均
通板速度は４０ｍ／分であった。一方、比較例の平均脱
スケール速度は２０ｍ／分であり、本発明では２倍の生
産性向上が可能である。EXAMPLE The pickling of a chromium-based stainless steel strip after hot rolling was carried out, and a pickling solution containing 15% of H 2 SO 4 was put into a pickling tank.
The pickling of the present invention in which the generation of bubbles at the edge of the steel strip was increased, and the conventional pickling in which the same pickling solution was heated to 90 ° C. as a comparative example were performed. As a result of this pickling, descaling could be efficiently performed in the present invention, and the average passing speed for treating 10 coils was 40 m / min. On the other hand, the average descaling speed of the comparative example is 20 m / min, and the present invention can improve productivity twice.
【００１９】[0019]
【発明の効果】本発明は、以上詳記したように、酸洗液
を加熱し沸騰させ気泡を発し、あるいは高温の蒸気、ガ
スの吹き込み気泡を出して酸洗することにより酸化層と
酸液との反応を促進させる酸洗方法において、加熱用蒸
気、ガス吹き込みを制御することによりスケール厚分布
のある鋼帯を効率よく酸洗し、トータルとしての酸洗処
理時間を短縮できるものである。また難酸洗鋼帯でも酸
洗性が従来より大幅に高められる。これらの作用効果か
ら本発明により酸洗設備の短縮化、省スペース化等が図
られる。According to the present invention, as described in detail above, the pickling solution is heated and boiled to generate air bubbles, or high-temperature steam or gas is blown out to perform pickling, thereby forming an oxide layer and an acid solution. In the pickling method for accelerating the reaction with the steel strip, the steel strip having a scale thickness distribution can be efficiently pickled by controlling the injection of heating steam and gas, thereby shortening the total pickling treatment time. In addition, pickling properties can be greatly improved even in a hardly pickled steel strip. According to the present invention, the pickling equipment can be shortened and the space can be saved from these effects.
【図１】本発明の実施例における酸洗装置を示す。FIG. 1 shows an pickling apparatus according to an embodiment of the present invention.
【図２】本発明の実施例における酸洗装置の詳細を示
す。FIG. 2 shows details of the pickling apparatus in the embodiment of the present invention.
【図３】本発明の一実施例にて本発明の従来の酸洗に対
する能力向上代を示す。FIG. 3 is a graph showing a performance improvement margin of the present invention over the conventional pickling in one embodiment of the present invention.
【図４】従来の酸洗装置を示す。FIG. 4 shows a conventional pickling apparatus.
１ 鋼帯 ２ 酸洗槽 ３ 酸洗液 ４ ガイドロール ５ 酸洗液加熱管 Reference Signs List 1 steel strip 2 pickling tank 3 pickling liquid 4 guide roll 5 pickling liquid heating tube
Claims (1)
たり、鋼帯が通板する酸洗槽内の酸洗液を加熱し沸騰さ
せ気泡を発し、または高温の蒸気やガスを酸洗槽内に吹
き込み気泡を発生させた酸洗液中でスケールを酸洗除去
する方法において、酸洗槽床面に鋼帯の幅方向に設けた
酸洗液加熱装置の加熱作用または加熱用蒸気、ガス配管
の気体吐出を鋼帯幅方向で変え沸騰気泡も含めた酸洗液
中の気泡発生を制御し酸洗することを特徴とするデスケ
ーリング方法。When pickling a steel strip scale continuously, the pickling solution in a pickling tank through which the steel strip passes is heated and boiled to generate bubbles, or high-temperature steam or gas is pickled. In a method of pickling and removing scales in a pickling solution in which bubbles are blown into a tank, a heating action or a heating steam of a pickling solution heating device provided in a width direction of a steel strip on a pickling tank floor surface, A descaling method characterized by controlling the generation of bubbles in a pickling solution including boiling bubbles by changing the gas discharge of a gas pipe in the width direction of a steel strip and performing pickling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9239191A JP2960195B2 (en) | 1991-04-23 | 1991-04-23 | Descaling control method for steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9239191A JP2960195B2 (en) | 1991-04-23 | 1991-04-23 | Descaling control method for steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04323391A JPH04323391A (en) | 1992-11-12 |
| JP2960195B2 true JP2960195B2 (en) | 1999-10-06 |
Family
ID=14053121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9239191A Expired - Lifetime JP2960195B2 (en) | 1991-04-23 | 1991-04-23 | Descaling control method for steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2960195B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10157340A1 (en) * | 2001-11-22 | 2003-05-28 | Sms Demag Ag | Process for treating the surfaces of a metal strand used for pickling a steel strip comprises moving the strand through a closed treatment channel at a regulated speed while directing turbulent jets of a pickling liquid |
| JP6992683B2 (en) * | 2018-06-12 | 2022-01-13 | 日本製鉄株式会社 | Pickling equipment and pickling method |
| CN112207128A (en) * | 2019-07-12 | 2021-01-12 | 常州新武轨道交通新材料有限公司 | Steel rolling processing technology |
-
1991
- 1991-04-23 JP JP9239191A patent/JP2960195B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04323391A (en) | 1992-11-12 |
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