JP2680785B2 - Method and apparatus for descaling annealed stainless steel strip - Google Patents
Method and apparatus for descaling annealed stainless steel stripInfo
- Publication number
- JP2680785B2 JP2680785B2 JP6195675A JP19567594A JP2680785B2 JP 2680785 B2 JP2680785 B2 JP 2680785B2 JP 6195675 A JP6195675 A JP 6195675A JP 19567594 A JP19567594 A JP 19567594A JP 2680785 B2 JP2680785 B2 JP 2680785B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- aqueous solution
- steel strip
- descaling
- electrolysis
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、焼鈍されたステンレス
鋼帯の脱スケールに係り、特に冷間圧延後の連続焼鈍に
おいて生成する酸化スケールを高速除去するに好適な脱
スケール方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to descaling of annealed stainless steel strip, and more particularly to a descaling method and apparatus suitable for high-speed removal of oxide scale produced in continuous annealing after cold rolling.
【０００２】[0002]
【従来の技術】冷間圧延ステンレス鋼帯は加工硬化層除
去のために焼鈍熱処理が施される。この際にステンレス
表面に生成する酸化スケールは商品価値を著しく損なう
ため、これを除去する必要がある。除去方法として硫酸
の如き強酸中で電解する方法あるいはアルカリ溶融塩に
浸漬する方法がある。これらの方法は、表面が粗雑にな
る、除去時間が長いあるいは取扱い難いなどの難点があ
る。上記、難点を解消する方法として、特公昭３８−１
２１６２号に記載のように中性塩水溶液中で電解後、硝
酸−弗酸混合水溶液中に浸漬する方法あるいは特公昭５
３−１３１７３号に記載のように中性塩水溶液中で電解
後、硝酸イオンを含む溶液中で電解する方法が提案され
ている。2. Description of the Related Art Cold rolled stainless steel strips are annealed to remove work hardened layers. At this time, the oxide scale formed on the stainless steel surface significantly impairs the commercial value, and it is necessary to remove it. As a removing method, there is a method of electrolyzing in a strong acid such as sulfuric acid or a method of immersing in an alkali molten salt. These methods have drawbacks such as a rough surface, a long removal time, and difficulty in handling. As a method for solving the above-mentioned difficulties, Japanese Patent Publication No. 38-1
No. 2162, a method of electrolyzing in a neutral salt aqueous solution and then dipping in a nitric acid-hydrofluoric acid mixed aqueous solution or JP-B-5
As described in JP-A-3-13173, a method of electrolyzing in a neutral salt aqueous solution and then electrolyzing in a solution containing nitrate ions has been proposed.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術は、ステ
ンレス鋼帯表面のスケール除去のみに着目しており、ス
ケール除去後のステンレス表面の光沢性についてあるい
は脱スケール処理の高速化や溶融塩アルカリ浸漬処理に
おける高温作業性の改善等の面については十分な配慮が
なされておらず、したがってスケール除去の速度向上及
び作業性向上が困難な問題があった。The above-mentioned prior art focuses only on the scale removal on the surface of the stainless steel strip. Regarding the glossiness of the stainless steel surface after the scale removal, the speedup of the descaling treatment, and the immersion in molten salt alkali. Sufficient consideration has not been given to aspects such as improvement of workability at high temperature in the treatment, and thus there is a problem that it is difficult to improve speed of scale removal and workability.
【０００４】本発明の目的は、高温処理を伴うことな
く、光沢性を有する脱スケールしたステンレス鋼帯を得
ることのできる高速脱スケール方法及び装置を提供する
ことにある。An object of the present invention is to provide a high-speed descaling method and apparatus capable of obtaining a descaled stainless steel strip having glossiness without high temperature treatment.
【０００５】[0005]
【課題を解決するための手段】上記目的は、スケールの
生成したステンレス鋼帯を（ａ）中性塩水溶液中で電解
する工程と、（ｂ）アルカリ水溶液中で電解する工程の
（ａ），（ｂ）の両工程を（ａ）工程の次に（ｂ）工程
の順、又は（ｂ）工程の次に（ａ）工程の順で実施した
後、該両工程で処理したステンレス鋼帯を更に硝酸弗酸
混合水溶液中で浸漬処理する工程を含む方法と、この方
法を実施するための（イ）好ましくは複数個の正，負電
極を有する中性塩水溶液電解槽と、（ロ）好ましくは複
数個の正，負電極を有するアルカリ水溶液電解槽の
（イ），（ロ）の両槽を（イ）槽の次に（ロ）槽の順、
又は（ロ）槽に次に（イ）槽の順で具備し、両槽の後方
に硝酸弗酸混合水溶液浸漬処理槽を具備したステンレス
鋼帯の連続脱スケール装置によって達成される。Means for Solving the Problems The above-mentioned objects are (a) a step of electrolyzing a scale-formed stainless steel strip in an aqueous neutral salt solution, and (b) a step of electrolyzing in an alkaline aqueous solution. After performing both steps of (b) in the order of step (a) and then step (b) or step (b) and then step (a), the stainless steel strip treated in both steps is Further, a method including a step of immersing in a nitric hydrofluoric acid mixed aqueous solution, (a) a neutral salt aqueous solution electrolytic cell having preferably a plurality of positive and negative electrodes for carrying out the method, and (b) preferably Is an alkaline aqueous solution electrolysis cell having a plurality of positive and negative electrodes, (a) and (b), followed by (a) and (b).
Alternatively, it can be achieved by a continuous descaling device for a stainless steel strip, which comprises (b) tank, then (a) tank in this order, and a nitric hydrofluoric acid mixed aqueous solution immersion treatment tank behind both tanks.
【０００６】上記連続脱スケール装置の各電解槽に有し
ている各電極は連続して移動するステンレス鋼帯に対向
して配設された不溶性電極である。そして、該方法を該
装置で実施することにより、実質的にスケールが除去さ
れ、かつ表面が優れた光沢性を有するステンレス鋼帯が
取扱い良く高速で得られる。Each electrode provided in each electrolytic cell of the above continuous descaling device is an insoluble electrode disposed so as to face a continuously moving stainless steel strip. Then, by carrying out the method with the apparatus, a stainless steel strip from which scale is substantially removed and the surface has excellent gloss can be obtained easily and at high speed.
【０００７】[0007]
【作用】ステンレス鋼帯表面に焼鈍処理により形成され
るスケールはスピネル型酸化物である。通常（８００℃
以上）の焼鈍熱処理ではＦｅ3Ｏ4 を含むＦｅＣｒ2Ｏ3
からなる鉄・クロムスピネル酸化物が生成する。このス
ケールの除去に対する前記処理工程を含む方法に使用す
る中性塩水溶液、アルカリ水溶液並びに硝酸水溶液又は
硝酸弗酸混合水溶液の各液中でのスケールを有するステ
ンレス鋼帯の電解あるいは浸漬処理は各々、次のような
作用を有する。FUNCTION The scale formed on the surface of the stainless steel strip by annealing is a spinel type oxide. Normal (800 ℃
In the above annealing heat treatment, FeCr 2 O 3 containing Fe 3 O 4
An iron-chromium spinel oxide consisting of is produced. Electrolytic or immersion treatment of the stainless steel strip having scale in each solution of neutral salt aqueous solution, alkaline aqueous solution and nitric acid aqueous solution or nitric hydrofluoric acid mixed aqueous solution used in the method including the treatment step for removing the scale, It has the following actions.
【０００８】中性塩電解では主として鉄・クロムスピネ
ル酸化物中のクロムを溶解する作用を有する。すなわち
図２のＣｒ−Ｈ2Ｏ系の電位−ｐＨ図（M.Pourbaix：Atl
as of Electrochemical Equilibria in Aque-ous Solut
ions (1966) Pergamon Press)から、クロムは中性〜酸
性のｐＨ領域で飽和カロメル電極基準で＋０．２Ｖ以上
にアノード分極することによりＣｒ2Ｏ7 2- として溶解
することが示される。通常の中性塩電解では電解塩とし
てＮａ2ＳＯ4 が用いられる。Ｎａ2ＳＯ4 は電解液を高
電導度にする作用をもつ。ｐＨは通常、中性から弱酸性
の領域で電解することからスケールはＣｒ2Ｏ7 2- とし
て溶解させる。The neutral salt electrolysis mainly has a function of dissolving chromium in iron / chromium spinel oxide. That Cr-H 2 O system potential -pH view of FIG. 2 (M.Pourbaix: Atl
as of Electrochemical Equilibria in Aque-ous Solut
ions (1966) Pergamon Press) show that chromium dissolves as Cr 2 O 7 2− by anodic polarization to +0.2 V or higher on the saturated calomel electrode standard in the neutral to acidic pH range. In ordinary neutral salt electrolysis, Na 2 SO 4 is used as an electrolytic salt. Na 2 SO 4 has the function of increasing the conductivity of the electrolytic solution. Since the pH is usually electrolyzed in the neutral to weakly acidic region, the scale is dissolved as Cr 2 O 7 2− .
【０００９】ＮａＯＨ水溶液やＫＯＨ水溶液などのアル
カリ水溶液中の電解処理は次の如き作用を有する。すな
わちスケール中のクロムをＣｒＯ4 2- として溶解する。
この場合の電解電位は、ｐＨ１３〜１４では飽和カロメ
ル電極基準で約−０．３５Ｖ以上の貴電位でアノード分
極させることにより得られることがわかる。すなわち、
先の中性塩電解に比べて、かなり低い電位でクロム酸化
物をＣｒＯ4 2- として溶解することで効率的に溶解除去
できる。Electrolytic treatment in an alkaline aqueous solution such as an aqueous NaOH solution or an aqueous KOH solution has the following effects. That is, chromium in the scale is dissolved as CrO 4 2− .
It can be seen that the electrolysis potential in this case is obtained by anodic polarization at a noble potential of about -0.35 V or higher based on the saturated calomel electrode at pH 13-14. That is,
The chromium oxide can be efficiently dissolved and removed by dissolving chromium oxide as CrO 4 2− at a considerably lower potential than in the neutral salt electrolysis.
【００１０】硝酸弗酸水溶液浸漬はスケール中の鉄及び
クロムを溶解する作用を有する。この場合、スケール界
面近傍の素地に存在するＣｒ欠乏層あるいは粒界酸化が
優先的に溶解されると同時に中性塩電解、アルカリ水溶
液中電解で残留した鉄を主体としたスケールが化学的に
溶解除去される。Immersion in a nitric hydrofluoric acid aqueous solution has a function of dissolving iron and chromium in the scale. In this case, the Cr-deficient layer or the grain boundary oxidation existing in the matrix near the scale interface is preferentially dissolved, and at the same time, the scale mainly composed of iron remaining in the neutral salt electrolysis and the electrolysis in the alkaline aqueous solution is chemically dissolved. To be removed.
【００１１】以上の３種類の処理によりステンレス鋼帯
上に生成したスピネル型酸化物スケールを、高効率、高
作業性、高速で除去できる。本発明の３種の処理の組合
わせにおいて、中性塩水溶液電解とアルカリ水溶液電解
は、どちらが先になっても効果は変わらない。硝酸弗酸
混合水溶液浸漬は除去しにくいクロム酸化物を除去した
後の最終工程で用いるのが効果的である。The spinel type oxide scale produced on the stainless steel strip by the above three kinds of treatments can be removed with high efficiency, high workability and high speed. In the combination of the three kinds of treatments of the present invention, the effect does not change whether neutral salt aqueous solution electrolysis or alkaline aqueous solution electrolysis is first. Immersion in a nitric-hydrofluoric acid mixed aqueous solution is effective when used in the final step after removing chromium oxide, which is difficult to remove.
【００１２】本発明では従来のアルカリ溶融塩のような
高温処理を伴わないので作業性が著しく向上する。ま
た、中性塩水溶液電解→硝酸弗酸混合水溶液浸漬では中
性塩水溶液電解の効率が若干低いためのスケール溶解速
度の問題が、効率の高いアルカリ電解をすることにより
解決され、スケール除去速度が向上する。なお、中性塩
水溶液電解とアルカリ水溶液電解は陽極電解を主体とす
ると、より効果的である。In the present invention, the workability is remarkably improved because it does not involve the high temperature treatment unlike the conventional alkali molten salt. In addition, the problem of scale dissolution rate due to slightly lower efficiency of neutral salt aqueous solution electrolysis in neutral salt aqueous solution electrolysis → nitric hydrofluoric acid mixed aqueous solution immersion is solved by highly efficient alkaline electrolysis, and scale removal rate is improved. improves. The neutral salt aqueous solution electrolysis and the alkaline aqueous solution electrolysis are more effective when anodic electrolysis is the main constituent.
【００１３】[0013]
【実施例】以下、本発明の実施例を図面により説明す
る。図１は、本発明になるステンレス鋼帯の脱スケール
法の一実施形態である実施例１の装置を示す。 〔実施例１〕連続焼鈍炉内で表面にスケールが生成した
ステンレス鋼帯１は、中性塩水溶液電解処理槽２に導入
される。中性塩水溶液電解処理槽２には、Ｎａ2ＳＯ4
２０％濃度、ｐＨ６の水溶液が満たされ、ステンレス鋼
帯１には非接触で設けられた一対の正電極３により正の
電圧がかけられ、正電極の前後両側にそれぞれ非接触で
設けられた一対の対極３’が負電極となり、この組合せ
によってステンレス鋼帯に対し陽極電解を主体とするス
テンレス鋼帯１からＮａ2ＳＯ4 水溶液を介して電流が
対極３’に流れる。この電流にともなってスケール中の
クロムがＣｒ2Ｏ7 2- となって溶解する。次いでステン
レス鋼帯１は水洗槽４に入って表面に残留するＮａ2Ｓ
Ｏ4 を洗浄する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the apparatus of Example 1 which is one embodiment of the descaling method for a stainless steel strip according to the present invention. Example 1 A stainless steel strip 1 having a scale formed on its surface in a continuous annealing furnace is introduced into a neutral salt aqueous solution electrolytic treatment tank 2. The neutral salt aqueous solution electrolytic treatment tank 2 contains Na 2 SO 4
A positive voltage is applied to the stainless steel strip 1 by a pair of positive electrodes 3 provided in a non-contact manner, which is filled with an aqueous solution having a concentration of 20% and a pH of 6, and a pair provided in front and rear sides of the positive electrode in a non-contact manner. Counter electrode 3'becomes a negative electrode, and by this combination, a current flows from the stainless steel strip 1 mainly for anodic electrolysis to the stainless steel strip through the Na 2 SO 4 aqueous solution to the counter electrode 3 '. With this current, chromium in the scale becomes Cr 2 O 7 2− and dissolves. Next, the stainless steel strip 1 enters the washing tank 4 and Na 2 S remaining on the surface
Wash O 4 .
【００１４】次いでリンガロール５で洗浄水を絞りとっ
たのちアルカリ水溶液電解処理槽６に導入される。アル
カリ水溶液電解処理槽６にはＮａＯＨ４０％濃度の水溶
液が満たされ、ステンレス鋼帯１には正電極７により正
の電圧が付与され、電流はＮａＯＨ水溶液を介して対極
７’に流れ、陽極電解を主体とした電解が行われる。こ
の時に流れる電流により、スケール中のクロム酸化物が
ＣｒＯ4 2- となって溶解除去される。ステンレス鋼帯１
表面にはクロム酸化物が除去されて、鉄酸化物が残る。
次いで、ステンレス鋼帯１は水洗槽８に入り、表面に残
留するＮａＯＨを水洗除去し、さらにリンガロール９に
より洗浄水を絞りとる。Next, the washing water is squeezed by the ringer roll 5 and then introduced into the alkaline aqueous solution electrolytic treatment tank 6. The alkaline aqueous solution electrolysis tank 6 is filled with an aqueous solution having a concentration of 40% NaOH, a positive voltage is applied to the stainless steel strip 1 by a positive electrode 7, and a current flows through the aqueous NaOH solution to the counter electrode 7 ′ to carry out anodic electrolysis. The main electrolysis is performed. Due to the current flowing at this time, the chromium oxide in the scale becomes CrO 4 2− and is dissolved and removed. Stainless steel strip 1
Chromium oxide is removed on the surface, leaving iron oxide.
Next, the stainless steel strip 1 enters the water washing tank 8 to wash and remove the NaOH remaining on the surface, and the washing water is squeezed by the ringer roll 9.
【００１５】次いでステンレス鋼帯１は硝酸弗酸混合水
溶液浸漬処理槽１０に導入される。硝酸弗酸混合水溶液
浸漬処理槽１０には７％濃度の硝酸水溶液及び２％濃度
の弗酸水溶液が満たされており、鉄を主体としたスケー
ルは硝酸弗酸による化学溶解に加えて素地のＣｒ欠乏層
の急激な溶解により溶解除去が促進される。なお、処理
槽１０は電極１１，１１’を備え、電解処理槽としても
使用できるものであり、浸漬処理槽として使用する場合
には電極への通電を止めて使用される。Next, the stainless steel strip 1 is introduced into a nitric acid / hydrofluoric acid mixed aqueous solution immersion treatment tank 10. The nitric / hydrofluoric acid mixed aqueous solution dipping treatment tank 10 is filled with a 7% concentrated nitric acid aqueous solution and a 2% concentrated hydrofluoric acid aqueous solution, and the scale mainly composed of iron is chemically dissolved by nitric hydrofluoric acid and added to the base Cr. The rapid dissolution of the depletion layer promotes dissolution removal. The treatment tank 10 includes the electrodes 11 and 11 ′ and can be used also as an electrolytic treatment tank. When used as an immersion treatment tank, the electrodes are stopped from being energized.
【００１６】以上の３種の処理によって、ステンレス鋼
上の鉄クロムスピネル酸化物からなるスケールが、高効
率且つ高速で除去される。さらにステンレス鋼帯１は水
洗槽１２で残留ＨＮＯ3 を水洗除去され、リンガロール
１３で水切り後、ドライヤー１４で乾燥されて、次工程
に送られる。表１から明らなように、本発明になる実施
例では完全にスケールが除去され、しかもスケール除去
後のステンレス表面は美麗であった。これに対し、表１
に比較例として示す従来法では、スケールの除去が不完
全あるいは除去後のステンレス表面がくもり、表面粗れ
が生じた。By the above-mentioned three kinds of treatments, the scale made of iron-chromium spinel oxide on stainless steel is removed with high efficiency and high speed. Further, the stainless steel strip 1 is washed with a washing tank 12 to remove residual HNO 3 with water, drained with a ringer roll 13, dried with a dryer 14 and sent to the next step. As is clear from Table 1, in the examples according to the present invention, the scale was completely removed, and the stainless steel surface after the scale removal was beautiful. On the other hand, Table 1
In the conventional method shown as a comparative example, the scale removal was incomplete or the stainless steel surface became cloudy after the removal, resulting in surface roughness.
【００１７】スケール除去状況の評価は、４００倍の光
学顕微鏡で観察し、視野内にスケールの残存痕がゼロの
場合を１００とし、１００からスケールの残存痕数を差
し引いた値で行うことができる。ここでは、その値がお
およそ９５以上を◎、７０〜９５未満を○、５０〜７０
未満を△、５０未満を×として評価した。ステンレス表
面状態の評価のうち「光沢」、「僅かにくもり」及び
「くもり」の評価は、「ＪＩＳ Ｚ ８７４１」の方法
５によって行った。すなわち、入射角及び受光角が２０
゜での光沢度が１５０以上の時を「光沢」、１００〜１
５０の時を「僅かにくもり」、５０〜１００の時を「く
もり」とした。なお、脱スケール処理前の焼鈍材は、表
面に約０．１μｍの厚さのスケールがあって青紫色を呈
し、光沢度は５０以下であった。「平滑」か「表面粗さ
大」かの判定は、表面粗さ計で測定し、平均粗さがおお
よそ０．４μｍ以下の場合を平滑とし、それを越える場
合に表面粗さ大とした。The scale removal condition can be evaluated by observing with a 400 × optical microscope and setting 100 when there are no scale residual marks in the field of view, and by subtracting the number of scale residual marks from 100. . Here, the value is approximately 95 or more for ◎, 70 to less than 95 for ◯, and 50 to 70.
Less than was evaluated as Δ and less than 50 was evaluated as x. Among the evaluations of the stainless surface state, the evaluations of “gloss”, “slightly cloudy” and “cloudy” were performed by Method 5 of “JIS Z 8741”. That is, the incident angle and the light receiving angle are 20
"Gloss" when the glossiness at 150 is 150 or more, 100-1
The time of 50 was "slightly cloudy", and the time of 50 to 100 was "cloudy". The annealed material before the descaling treatment had a scale with a thickness of about 0.1 μm on its surface, exhibited a bluish purple color, and had a glossiness of 50 or less. The determination of "smooth" or "large surface roughness" was made by measuring with a surface roughness meter, and when the average roughness was approximately 0.4 μm or less, it was regarded as smooth, and when it exceeded it, the surface roughness was judged as large.
【００１８】なお、本実施例における電解処理では、電
解液の温度を高くすることにより、スケール除去が容易
になることは当然である。表１には実施例１で処理した
ステンレス鋼帯の脱スケール状況と比較のため従来法
（中性塩水溶液電解＋硝酸水溶液電解、中性塩水溶液電
解＋硝酸−弗酸混合水溶液浸漬）の場合も比較例１、比
較例２として示す。使用したステンレス鋼帯はフェライ
ト系ＳＵＳ４３０の０．５ｍｍ厚さの板である。なお、
電解条件は次の通りである。 中性塩水溶液電解 ：アノード電解、電流密度６Ａ／ｄ
ｍ2 アルカリ水溶液電解：アノード電解、電流密度３Ａ／ｄ
ｍ2 硝酸水溶液電解電解：カソード電解、電流密度２Ａ／ｄ
ｍ2 In the electrolytic treatment of this embodiment, it is natural that the scale removal is facilitated by raising the temperature of the electrolytic solution. Table 1 shows the case of the conventional method (electrolysis of neutral salt aqueous solution + electrolysis of nitric acid aqueous solution, electrolysis of neutral salt aqueous solution + immersion of nitric acid-hydrofluoric acid mixed aqueous solution) for comparison with the descaling situation of the stainless steel strip treated in Example 1. Are also shown as Comparative Example 1 and Comparative Example 2. The stainless steel strip used is a ferrite SUS430 plate having a thickness of 0.5 mm. In addition,
The electrolysis conditions are as follows. Neutral salt aqueous solution electrolysis: Anode electrolysis, current density 6A / d
m 2 alkaline aqueous solution electrolysis: anode electrolysis, current density 3 A / d
m 2 nitric acid aqueous solution electrolysis: cathode electrolysis, current density 2 A / d
m 2
【００１９】〔実施例２〕図２Ｃｒ−Ｈ2Ｏ素の電位−
ｐＨ線図（２５℃）に示す実施例１の脱スケール方法
で、工程順を中性塩水溶液電解槽２とアルカリ水溶液電
解槽６の順序を入れ替えた脱スケール方法を用いた場合
を実施例２とする。すなわち、ステンレス鋼帯を先ずア
ルカリ水溶液電解槽中で正電圧をステンレス鋼帯に印加
してアルカリ水溶液電解した。次いで、中性塩水溶液電
解槽中で正電圧をステンレス鋼帯に印加し中性塩水溶液
電解した。しかる後、硝酸弗酸混合水溶液浸漬槽中でス
テンレス鋼帯を浸漬処理した。各電解処理間及び硝酸弗
酸水溶液浸漬後の洗浄処理及び水切りは、いずれも実施
例１と同じである。この方法によりスケールが完全に除
去され美麗な表面を有するステンレス鋼帯を得た。表１
にその処理条件及び処理結果を示す。[0019] Example 2 FIG 2Cr-H 2 O-containing potential -
In the descaling method of Example 1 shown in the pH diagram (25 ° C.), a case where the descaling method in which the order of the steps of the neutral salt aqueous solution electrolysis tank 2 and the alkaline aqueous solution electrolysis tank 6 was changed was used. And That is, the stainless steel strip was first electrolyzed in an alkaline aqueous solution by applying a positive voltage to the stainless steel strip in an alkaline aqueous solution electrolysis cell. Next, a positive voltage was applied to the stainless steel strip in a neutral salt aqueous solution electrolyzer to electrolyze the neutral salt aqueous solution. Then, the stainless steel strip was immersed in a nitric hydrofluoric acid mixed solution immersion tank. The cleaning treatment and draining between the electrolytic treatments and after immersion in the aqueous solution of hydrofluoric acid nitric acid are the same as in Example 1. By this method, the scale was completely removed and a stainless steel strip having a beautiful surface was obtained. Table 1
Shows the processing conditions and processing results.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【発明の効果】本発明によれば、取扱いの難しい高温の
溶融塩浴を用いることなくステンレス鋼帯のスケールを
迅速に除去できる。さらに、従来の電解処理では得られ
なかった美麗で表面状態の良好なステンレス鋼板が得ら
れる効果がある。According to the present invention, the scale of the stainless steel strip can be quickly removed without using a high-temperature molten salt bath which is difficult to handle. Further, there is an effect that a beautiful stainless steel plate having a good surface condition, which cannot be obtained by the conventional electrolytic treatment, can be obtained.
【図１】本発明の実施例になる脱スケールプロセスの工
程図。FIG. 1 is a process diagram of a descaling process according to an embodiment of the present invention.
【図２】本発明の作用を説明するためのＣｒ−Ｈ2Ｏ系
の電位−ｐＨ図。FIG. 2 is a potential-pH diagram of a Cr—H 2 O system for explaining the action of the present invention.
１…ステンレス鋼帯、２…中性塩水溶液電解処理槽、３
…正電極、３’…負電極、４…水洗槽、５…リンガロー
ル、６…濃厚アルカリ水溶液電解処理槽、７，７’…電
極、８…水洗槽、９…リンガロール、１０…硝酸弗酸水
溶液浸漬処理槽、１１，１１’…電極、１２…水洗槽、
１３…リンガロール、１４…ドライヤー1 ... Stainless steel strip, 2 ... Neutral salt aqueous solution electrolytic treatment tank, 3
... Positive electrode, 3 '... Negative electrode, 4 ... Water washing tank, 5 ... Ringer roll, 6 ... Concentrated alkaline aqueous solution electrolytic treatment tank, 7, 7' ... Electrode, 8 ... Water washing tank, 9 ... Ringer roll, 10 ... Fluorine nitrate Acid aqueous solution immersion treatment tank, 11, 11 '... Electrode, 12 ... Water washing tank,
13 ... Ringer roll, 14 ... Hair dryer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山口 輝雄 茨城県日立市幸町３丁目１番地１号 株 式会社 日立製作所 日立工場内 (56)参考文献 特開 平７−90697（ＪＰ，Ａ) 特開 昭49−67836（ＪＰ，Ａ) 特開 平７−90696（ＪＰ，Ａ) 特公 昭53−13173（ＪＰ，Ｂ２) 長谷川正義監修 「ステンレス鋼便 覧」 Ｐ．841−849 日刊工業新聞社刊 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Teruo Yamaguchi Inventor Teruo Yamaguchi 3-1-1, Sachimachi, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (56) Reference JP-A-7-90697 (JP, A) JP-A-49-67836 (JP, A) JP-A-7-90696 (JP, A) JP-B-53-13173 (JP, B2) Supervised by Masayoshi Hasegawa "Stainless Steel Handbook" p. 841-849 Published by Nikkan Kogyo Shimbun
Claims (3)
方法において、該ステンレス鋼帯を中性塩水溶液中で電
解する工程とアルカリ水溶液中で電解する工程との両工
程を含み、該両工程を経たステンレス鋼帯を硝酸弗酸混
合水溶液中で浸漬処理する工程を含む焼鈍されたステン
レス鋼帯の脱スケール方法。1. A method for descaling an annealed stainless steel strip, comprising both steps of electrolyzing the stainless steel strip in a neutral salt aqueous solution and electrolyzing in an alkaline aqueous solution. A method for descaling an annealed stainless steel strip, which comprises a step of immersing the obtained stainless steel strip in a mixed aqueous solution of nitric and hydrofluoric acid.
と正，負電極を有するアルカリ水溶液電解槽との両電解
槽を具備し、該両電解槽を経た後方に硝酸弗酸混合水溶
液浸漬処理槽を具備してなる焼鈍されたステンレス鋼帯
の連続脱スケール装置。2. A neutral salt aqueous solution electrolytic cell having positive and negative electrodes and an alkaline aqueous solution electrolytic cell having positive and negative electrodes are provided, and a nitric hydrofluoric acid mixed aqueous solution is provided behind the electrolytic cells. A continuous descaling device for annealed stainless steel strips equipped with a dipping treatment tank.
帯に対向して該ステンレス鋼帯に対し非接触で配設され
た不溶性電極であることを特徴とする請求項２記載の焼
鈍されたステンレス鋼帯の連続脱スケール装置。3. The annealed electrode according to claim 2, wherein each electrode is an insoluble electrode that is arranged in a non-contact manner with the stainless steel strip facing the continuously moving stainless steel strip. Continuous descaling device for stainless steel strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6195675A JP2680785B2 (en) | 1994-08-19 | 1994-08-19 | Method and apparatus for descaling annealed stainless steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6195675A JP2680785B2 (en) | 1994-08-19 | 1994-08-19 | Method and apparatus for descaling annealed stainless steel strip |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63271960A Division JPH0759759B2 (en) | 1988-10-29 | 1988-10-29 | Method and apparatus for descaling annealed stainless steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0790698A JPH0790698A (en) | 1995-04-04 |
| JP2680785B2 true JP2680785B2 (en) | 1997-11-19 |
Family
ID=16345133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6195675A Expired - Fee Related JP2680785B2 (en) | 1994-08-19 | 1994-08-19 | Method and apparatus for descaling annealed stainless steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2680785B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7031515B2 (en) * | 2018-07-05 | 2022-03-08 | 日本製鉄株式会社 | Manufacturing method of austenitic stainless steel sheet |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4967836A (en) * | 1972-11-02 | 1974-07-01 | ||
| JPS5313173A (en) * | 1976-07-21 | 1978-02-06 | Hitachi Ltd | Reversing mechanism of switch and others |
| JPH06195674A (en) * | 1992-03-31 | 1994-07-15 | Konica Corp | Magnetic recording medium |
-
1994
- 1994-08-19 JP JP6195675A patent/JP2680785B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 長谷川正義監修 「ステンレス鋼便覧」 Ｐ．８４１−８４９ 日刊工業新聞社刊 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0790698A (en) | 1995-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR0173975B1 (en) | Method of descaling stainless steel and apparatus for the same | |
| US2115005A (en) | Electrochemical treatment of metal | |
| JP2009167465A (en) | Pickling method and pickling device for cold rolled stainless steel strip | |
| JP2680785B2 (en) | Method and apparatus for descaling annealed stainless steel strip | |
| JPH0827600A (en) | Descaling method and device for stainless steel strip | |
| JP2003286592A (en) | Pickling process for stainless steel strip | |
| US3254011A (en) | Electrolytic potassium hydroxide descaling | |
| JP2680784B2 (en) | Method and apparatus for descaling annealed stainless steel strip | |
| JPS59157288A (en) | Method for pickling stainless steel strip | |
| US4711707A (en) | Method for removal of scale from hot rolled steel | |
| US3632490A (en) | Method of electrolytic descaling and pickling | |
| KR100373805B1 (en) | Neutral salt electrolyte treatment method and apparatus therefor, and descaling method of stainless steel and apparatus therefor | |
| JP2585444B2 (en) | Method and apparatus for descaling stainless steel strip | |
| JPH0790697A (en) | Descaled stainless steel | |
| JP4352190B2 (en) | Descaling method of titanium material | |
| JP2577619B2 (en) | Method and apparatus for descaling alloy steel strip | |
| JPH10219500A (en) | Finish electrolytic pickling method for descaling of stainless steel strip | |
| JP2517353B2 (en) | Descaling method for stainless steel strip | |
| JPH08319600A (en) | Method for descaling stainless steel strip and device therefor | |
| KR100368207B1 (en) | Electrolytic pickling solution for cold annealed austenitic stainless steel sheet | |
| JP2577618B2 (en) | Method and apparatus for descaling alloy steel strip | |
| JPH1161500A (en) | Descaling of stainless steel strip and heat resistant steel strip | |
| JP4804657B2 (en) | A descaling method for austenitic stainless steel cold-rolled annealed steel sheets | |
| JP3252660B2 (en) | Neutral salt electrolyte treatment method and treatment apparatus and descaling method and apparatus for stainless steel | |
| JPH05295600A (en) | Continuous descaling method for stainless steel strip and its device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |