JPH1150283A - Descaling device and descaling method for stainless steel - Google Patents
Descaling device and descaling method for stainless steelInfo
- Publication number
- JPH1150283A JPH1150283A JP20562897A JP20562897A JPH1150283A JP H1150283 A JPH1150283 A JP H1150283A JP 20562897 A JP20562897 A JP 20562897A JP 20562897 A JP20562897 A JP 20562897A JP H1150283 A JPH1150283 A JP H1150283A
- Authority
- JP
- Japan
- Prior art keywords
- sulfuric acid
- pickling
- acid
- hydrofluoric acid
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱間加工の際に、
あるいは熱処理の際にステンレス鋼の表面にできたスケ
ールを除去するための、ステンレス鋼のデスケール装置
及びデスケール方法に関する。TECHNICAL FIELD The present invention relates to a method for hot working,
Alternatively, the present invention relates to a stainless steel descaling apparatus and a descaling method for removing scale formed on the surface of stainless steel during heat treatment.
【０００２】[0002]
【従来の技術】ステンレス鋼のスケールを除去するため
には、通常は硝酸−弗酸の酸洗液を用いている。しかし
近年、廃棄された硝酸あるいは硝酸塩は環境汚染を起こ
すために規制が強化される趨勢にある。このため硝酸を
用いないステンレス鋼の酸洗法が望まれている。表面に
スケールが発生したステンレス鋼を、溶融アルカリのソ
ルトバスに浸漬するとスケールが変質し、その後の酸洗
でスケールの除去が容易となる事が知られている。しか
しこのソルトバスを用いるデスケール方法においても、
ソルトバス後の酸洗には従来は専ら硝酸−弗酸の酸洗液
が用いられていた。このため硝酸の使用量を十分には低
減する事ができなかった。2. Description of the Related Art In order to remove the scale of stainless steel, a pickling solution of nitric acid and hydrofluoric acid is usually used. However, in recent years, there has been a tendency that regulations on discarded nitric acid or nitrate cause environmental pollution, and the regulations have been tightened. Therefore, a method of pickling stainless steel without using nitric acid is desired. It is known that when stainless steel having scale generated on its surface is immersed in a molten alkali salt bath, the scale is deteriorated, and the scale is easily removed by subsequent pickling. However, even in the descaling method using this salt bath,
Conventionally, a pickling solution of nitric acid and hydrofluoric acid has been exclusively used for pickling after the salt bath. For this reason, the use amount of nitric acid could not be reduced sufficiently.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、硝酸、硝酸
塩の廃棄量を十分に低減する事ができ、かつ従来よりも
高能率でスケールを除去する事が可能な、ステンレス鋼
のデスケール装置とデスケール方法の提供を課題として
いる。SUMMARY OF THE INVENTION The present invention relates to a stainless steel descaling apparatus which can sufficiently reduce the amount of waste of nitric acid and nitrate and can remove scale more efficiently than before. The task is to provide a descaling method.
【０００４】[0004]
【課題を解決するための手段】本発明は、（１）入側か
ら出側方向に、１または２以上の酸洗槽を有する予備系
列と、溶融アルカリを収納したソルトバスと、１または
２以上の酸洗槽を有する仕上系列とを順次配してなるス
テンレス鋼のデスケール装置において、何れの酸洗槽に
も硝酸を含有する酸洗液を用いる事なく、また予備系列
と仕上系列のそれぞれの少なくとも１の酸洗槽を硫酸−
弗酸の酸洗槽とし、仕上系列の硫酸−弗酸の酸洗槽の使
用済みの液を予備系列の硫酸−弗酸の酸洗槽に供給する
構造とした事を特徴とする、ステンレス鋼のデスケール
装置である。According to the present invention, there are provided (1) a preliminary system having one or more pickling tanks from an inlet side to an outlet side, a salt bath containing molten alkali, In a stainless steel descaler, in which a finishing line having the above pickling tank is sequentially arranged, without using a pickling solution containing nitric acid in any pickling tank, and also in each of the preliminary line and the finishing line. At least one pickling tank of sulfuric acid
A stainless steel, characterized in that it is a hydrofluoric acid pickling tank, and the used liquid of the finishing series sulfuric acid-hydrofluoric acid pickling tank is supplied to a preliminary series sulfuric acid-hydrofluoric acid pickling tank. Descaler.
【０００５】また（２）予備系列の硫酸−弗酸の酸洗槽
が、硫酸：２５〜６０ｇ／Ｌ，ＨＦ：３〜１０ｇ／Ｌの
硫酸−弗酸の酸洗槽であり、仕上系列の硫酸−弗酸の酸
洗槽が、硫酸４０〜８０ｇ／Ｌ，ＨＦ：５〜１５ｇ／
Ｌ，Ｆｅ3+＞５ｇ／Ｌの硫酸−弗酸の酸洗槽である事を
特徴とする、前記（１）に記載のフェライト系ステンレ
ス鋼のデスケール装置である。[0005] (2) The sulfuric acid / hydrofluoric acid pickling tank of the preliminary series is a sulfuric acid / hydrofluoric acid pickling tank of 25 to 60 g / L of sulfuric acid and 3 to 10 g / L of HF. The sulfuric acid-hydrofluoric acid pickling tank is 40-80 g / L sulfuric acid, 5-15 g / HF.
The ferric stainless steel descaling apparatus according to the above (1), characterized in that it is a sulfuric acid-hydrofluoric acid pickling tank with L, Fe 3+ > 5 g / L.
【０００６】また（３）予備系列の硫酸−弗酸の酸洗槽
が、硫酸：６０〜２００ｇ／Ｌ，ＨＦ：１０〜２５ｇ／
Ｌの硫酸−弗酸の酸洗槽であり、仕上系列の硫酸−弗酸
の酸洗槽がＨ2ＳＯ4：１００〜２５０ｇ／Ｌ，ＨＦ：１
５〜５０ｇ／Ｌ，Ｆ3+＞５ｇ／Ｌの硫酸−弗酸の酸洗槽
である事を特徴とする、前記（１）に記載のオーステナ
イト系ステンレス鋼のデスケール装置である。(3) The sulfuric acid-hydrofluoric acid pickling tank of the preliminary series is composed of sulfuric acid: 60 to 200 g / L and HF: 10 to 25 g / L.
L is a sulfuric acid-hydrofluoric acid pickling tank, and the sulfuric acid-hydrofluoric acid pickling tank of the finishing series is H 2 SO 4 : 100 to 250 g / L, HF: 1
The austenitic stainless steel descaling apparatus according to the above (1), characterized in that the pickling tank is a sulfuric acid / hydrofluoric acid pickling tank of 5 to 50 g / L, F 3+ > 5 g / L.
【０００７】また（４）硫酸−弗酸の酸洗液が、温度が
３５〜６５℃の硫酸−弗酸の酸洗液であることを特徴と
する、前記（１）〜（３）の何れかに記載のステンレス
鋼のデスケール装置である。(4) The pickling solution of sulfuric acid and hydrofluoric acid is a pickling solution of sulfuric acid and hydrofluoric acid at a temperature of 35 to 65 ° C. A stainless steel descaling apparatus according to any one of the first to third aspects.
【０００８】また（５）仕上系列の硫酸−弗酸の酸洗槽
が、浴の酸化還元電位を＋２５０ｍＶ以上に維持し浴中
のＦｅ2+を一定割合でＦｅ3+に変換するための過酸化水
素を添加する仕上系列の硫酸−弗酸の酸洗槽であること
を特徴とする、前記（１）から（４）の何れかに記載の
オーステナイト系ステンレス鋼のデスケール装置であ
る。(5) A sulfuric acid / hydrofluoric acid pickling tank of a finishing series is used for maintaining the oxidation-reduction potential of the bath at +250 mV or more and converting Fe 2+ in the bath to Fe 3+ at a constant rate. The austenitic stainless steel descaler according to any one of (1) to (4), which is a finishing series sulfuric acid-hydrofluoric acid pickling tank to which hydrogen oxide is added.
【０００９】また（６）予備系列の硫酸−弗酸の酸洗槽
と、仕上系列の硫酸−弗酸の酸洗槽の一方あるいは双方
が、２０〜３０Ｎｍ3／ｈｒ／ｍ3当たりの空気を連続的
に導入する硫酸−弗酸の酸洗槽であることを特徴とす
る、前記（１）から（５）の何れかに記載のオーステナ
イト系ステンレス鋼のデスケール装置である。(6) One or both of the preparatory series sulfuric acid / hydrofluoric acid pickling tank and the finishing series sulfuric acid / hydrofluoric acid pickling tank supply air per 20 to 30 Nm 3 / hr / m 3. The austenitic stainless steel descaler according to any one of (1) to (5), which is a pickling tank for sulfuric acid and hydrofluoric acid which is continuously introduced.
【００１０】また（７）前記（２），（４），（５），
（６）の何れかに記載のデスケール装置によりデスケー
リングを行う事を特徴とする、フェライト系ステンレス
鋼のデスケール方法である。(7) The above (2), (4), (5),
A descaling method for ferritic stainless steel, wherein descaling is performed by the descaling device according to any one of (6) and (6).
【００１１】また（８）前記（３），（４），（５），
（６）の何れかに記載のデスケール装置によりデスケー
リングを行う事を特徴とする、オーステナイト系ステン
レス鋼のデスケール方法である。(8) The above (3), (4), (5),
A descaling method for austenitic stainless steel, wherein descaling is performed by the descaling device according to any one of (6).
【００１２】本発明では酸洗液が硝酸を含有しないもの
であれば、予備系列、仕上系列に更に他の酸洗槽を配す
る事を拒むものではない。本発明の各酸洗槽の間には、
あるいは酸洗槽とソルトバスの間には、必要に応じて酸
洗液等が混じりあう事を防止するための公知の水洗設備
が設けられており、また最後の酸洗槽の後には公知の水
洗設備やデスマット機能を備えた水洗設備が設けられて
いる事は云うまでもない。In the present invention, as long as the pickling solution does not contain nitric acid, it is not refused to arrange another pickling tank in the preliminary series and the finishing series. Between each pickling tank of the present invention,
Alternatively, between the pickling tank and the salt bath, a known water washing facility is provided to prevent the pickling liquid or the like from being mixed as necessary, and a known water washing facility is provided after the last pickling tank. Needless to say, there is provided a washing facility or a washing facility with a desmut function.
【００１３】[0013]
【発明の実施の形態】予備系列では、従来は硫酸、塩酸
等が酸洗液として使用されている。本発明ではこれ等に
代えて、硫酸−弗酸の酸洗液を用いる。本発明では仕上
系列で使用済みの酸洗液を用いるが、この硫酸−弗酸の
酸洗液は従来の硫酸あるいは塩酸に比べてステンレス鋼
のスケールに強く作用し、次ぎのソルトバスに入る際の
ステンレス鋼のスケールを従来よりも著しく薄くする。
この結果、ソルトバスを出た後のステンレス鋼のスケー
ルは、従来よりも一層除去が容易となる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the preliminary series, sulfuric acid, hydrochloric acid and the like have conventionally been used as a pickling solution. In the present invention, a pickling solution of sulfuric acid-hydrofluoric acid is used instead of these. In the present invention, the used pickling solution used in the finishing system is used. However, the pickling solution of sulfuric acid and hydrofluoric acid has a stronger effect on the scale of stainless steel than conventional sulfuric acid or hydrochloric acid, and when entering the next salt bath. Stainless steel scale significantly thinner than before.
As a result, the scale of the stainless steel after leaving the salt bath is more easily removed than before.
【００１４】予備系列の酸洗液は、フェライト系ステン
レス鋼の場合は、硫酸：２５〜６０ｇ／Ｌ，ＨＦ：３〜
１０ｇ／Ｌのものが好ましい。またオーステナイト系ス
テンレス鋼の場合は、硫酸６０〜２００ｇ／Ｌ，ＨＦ：
１０〜２５ｇ／Ｌのものが好ましい。本発明では予備系
列の酸洗液を後で述べる仕上系列の酸洗液と同じ種類の
硫酸−弗酸系とし、仕上系列で使用済みの硫酸−弗酸の
酸洗液を仕上系列の硫酸−弗酸の酸洗槽から受け入れて
使用する。この結果、仕上系列の硫酸−弗酸の酸洗液は
予備系列で再利用され、また予備系列では従来の酸洗液
よりも強い作用を有する酸洗液となって再利用される。The pickling solution in the preliminary series is, in the case of ferritic stainless steel, sulfuric acid: 25 to 60 g / L, HF: 3 to
10 g / L is preferred. In the case of austenitic stainless steel, sulfuric acid 60 to 200 g / L, HF:
Those having 10 to 25 g / L are preferred. In the present invention, the pickling solution of the preliminary series is made of the same type of sulfuric acid / hydrofluoric acid as the pickling solution of the finishing series described later, and the pickling solution of sulfuric acid / hydrofluoric acid used in the finishing series is replaced with the sulfuric acid of the finishing series. Receive from the hydrofluoric acid pickling tank and use. As a result, the pickling solution of sulfuric acid and hydrofluoric acid in the finishing series is reused in the preliminary series, and in the preliminary series, it is reused as a pickling solution having a stronger action than the conventional pickling solution.
【００１５】ソルトバスを用いない場合はステンレス鋼
のデスケールには長時間を要する。本発明では、スケー
ルを高能率に除去するために、溶融アルカリのソルトバ
スを用いる。ステンレス鋼のスケールはこの溶融アルカ
リによって変質し除去が容易となる。このソルトバス用
のソルトとしては、例えばコリーンソルトＤＧＳ（商品
名、(株)パーカーコーポレーション製）を４３０〜４７
０℃に加熱して使用する事ができる。When a salt bath is not used, it takes a long time to descale stainless steel. In the present invention, a salt bath of a molten alkali is used in order to remove scale efficiently. The scale of the stainless steel is altered by the molten alkali and is easily removed. As a salt for the salt bath, for example, Colleen Salt DGS (trade name, manufactured by Parker Corporation) is 430-47.
It can be used by heating to 0 ° C.
【００１６】仕上系列では、従来は硝酸−弗酸が酸洗液
として使用されている。本発明では硝酸を用いないで、
硫酸−弗酸の酸洗液を用いる。本発明の仕上系列の酸洗
液は硫酸−弗酸であるが、予備系列でスケールが十分に
薄くなっているために、またソルトバスでこの薄いスケ
ールも除去し易いように変質しているために、従来の硝
酸−弗酸の場合と同様に、あるいは従来の硝酸−弗酸の
場合よりも高能率でスケールを除去することができる。In the finishing series, nitric acid-hydrofluoric acid has been conventionally used as a pickling solution. In the present invention, without using nitric acid,
A sulfuric acid-hydrofluoric acid pickling solution is used. The pickling solution of the finishing series of the present invention is sulfuric acid-hydrofluoric acid, but because the scale is sufficiently thin in the preliminary series, and because the thin scale has been altered in a salt bath so that it can be easily removed. In addition, the scale can be removed in the same manner as in the case of the conventional nitric acid-hydrofluoric acid or with higher efficiency than in the case of the conventional nitric acid-hydrofluoric acid.
【００１７】仕上系列の酸洗液は、フェライト系ステン
レス鋼の場合は、硫酸４０〜８０ｇ／Ｌ，ＨＦ：５〜１
５ｇ／Ｌ，Ｆｅ3+＞５ｇ／Ｌのものが好ましい。またオ
ーステナイト系ステンレス鋼の場合は、Ｈ2ＳＯ4：１０
０〜２５０ｇ／Ｌ，ＨＦ：１５〜５０ｇ／Ｌ，Ｆｅ3+＞
５ｇ／Ｌのものが好ましい。Ｆｅ3+は、例えば硫酸第２
鉄として酸洗液に添加する。Ｆｅ3+は、２Ｆｅ3+＋Ｆｅ
→３Ｆｅ2+となるために、酸化剤として硝酸にとって代
われる。The pickling solution of the finishing series is, in the case of ferritic stainless steel, sulfuric acid 40 to 80 g / L, HF: 5-1.
Those with 5 g / L and Fe 3+ > 5 g / L are preferred. In the case of austenitic stainless steel, H 2 SO 4 : 10
0 to 250 g / L, HF: 15 to 50 g / L, Fe 3+ >
5 g / L is preferred. Fe 3+ is, for example, sulfuric acid secondary
It is added to the pickling solution as iron. Fe 3+ is 2Fe 3+ + Fe
→ 3Fe 2+ is replaced by nitric acid as an oxidizing agent.
【００１８】操業中のＦｅ3+は、溶液中のＦｅ2+を一定
割合で変換して得られる事が好ましい。酸洗液中の酸化
還元電位が＋２５０ｍＶ以上で酸洗液中のＦｅ3+はステ
ンレス鋼表面でＦｅ2+に定常的に一定速度で変化する。
この酸化還元電位は、酸洗液に過酸化水素を添加する事
により、また２０〜３０Ｎｍ3／ｈｒ／酸洗液１ｍ3の空
気を酸洗液に連続的に導入する事により、あるいは双方
を行う事により＋２５０ｍＶ以上とする事ができる。It is preferable that Fe 3+ in operation is obtained by converting Fe 2+ in a solution at a constant rate. When the oxidation-reduction potential in the pickling solution is +250 mV or more, Fe 3+ in the pickling solution constantly changes to Fe 2+ on the stainless steel surface at a constant rate.
The oxidation-reduction potential can be determined by adding hydrogen peroxide to the pickling solution, continuously introducing air of 20 to 30 Nm 3 / hr / m 3 of the pickling solution, or both. By doing so, the voltage can be increased to +250 mV or more.
【００１９】仕上系列の酸洗液は、周期的に分析する事
によりその成分を管理するが、酸洗力が劣化した場合
は、既に述べた如く予備系列の酸洗槽に移送し、仕上系
列の酸洗液には硫酸、弗酸等を添加補充して酸洗力を回
復させて使用する。The components of the finishing pickling liquid are controlled by periodic analysis, but when the pickling power is deteriorated, the pickling liquid is transferred to the preliminary pickling tank as described above, and Sulfuric acid, hydrofluoric acid, etc. are added and replenished to the acid pickling solution to recover the pickling power.
【００２０】[0020]
【実施例】本発明者等は、フェライト系ステンレス鋼
（JIS SUS430ステンレス鋼）の熱延線材を焼鈍後、予備
系列、仕上系列の酸を変えて、デスケーリングを行っ
た。その結果を表１に示した。番号１〜４は予備系列に
塩酸又は硫酸を用い、仕上系列に硝酸−弗酸を用いた従
来例である。この際には各処理時間が１０分で、ライン
速度が遅い場合には優れた脱スケール結果が得られる
が、処理時間が５分の高能率デスケールの場合は脱スケ
ール結果は悪い。番号５は予備系列にも硝酸−弗酸を用
いた例であるが、この際には処理時間が５分の場合にも
優れたデスケール結果が得られるる。しかしこの際に
は、硝酸の使用量が多くなるという問題点が発生する。EXAMPLES The present inventors performed descaling by annealing a hot-rolled wire of ferritic stainless steel (JIS SUS430 stainless steel) and then changing the acid of the preliminary series and the finishing series. The results are shown in Table 1. Nos. 1-4 are conventional examples in which hydrochloric acid or sulfuric acid is used in the preliminary system and nitric acid-hydrofluoric acid is used in the finishing system. In this case, when the processing time is 10 minutes and the line speed is low, an excellent descaling result can be obtained. However, when the processing time is a highly efficient descaling of 5 minutes, the descaling result is poor. No. 5 is an example in which nitric acid / hydrofluoric acid is also used in the preliminary series. In this case, an excellent descaling result can be obtained even when the processing time is 5 minutes. However, in this case, there is a problem that the use amount of nitric acid increases.
【００２１】番号６は、予備系列に本発明の予備系列用
の酸洗液よりも希薄な硫酸−弗酸の酸洗液を用いた比較
例であり、番号７は仕上系列に本発明よりも希薄な酸洗
液を用いた比較例である。これ等の場合に、処理時間が
５分の高能率デスケールを行うと、脱スケールは不十分
となる。No. 6 is a comparative example in which a pickling solution of sulfuric acid and hydrofluoric acid, which is more dilute than the pickling solution for the preparatory line of the present invention, was used in the preparatory line. It is a comparative example using a dilute pickling solution. In these cases, a high-efficiency descaling with a processing time of 5 minutes results in insufficient descaling.
【００２２】[0022]
【表１】 [Table 1]
【００２３】番号８及び９は予備系列および仕上系列の
双方に本発明でそれぞれ特定した硫酸−弗酸の酸洗液を
用いた例である。この際には処理時間が１０分の場合
も、また処理時間が５分の高能率デスケールの場合も、
極めて優れた脱スケール結果が得られた。Nos. 8 and 9 are examples in which the pickling solution of sulfuric acid / hydrofluoric acid specified in the present invention was used for both the preliminary series and the finishing series. In this case, even when the processing time is 10 minutes, or when the processing time is a highly efficient descale of 5 minutes,
Very good descaling results were obtained.
【００２４】本発明者等は、オーステナイト系ステンレ
ス鋼（JIS SUS304ステンレス鋼）の熱延線材を焼鈍後、
鋼帶を、予備系列、仕上系列の酸を変えて、デスケーリ
ングを行った。その結果を表２に示した。番号１１〜１
４は予備系列に塩酸又は硫酸を用い、仕上系列に硝酸−
弗酸を用いた従来例である。この際には各処理時間が１
０分でライン速度が遅い場合には優れた脱スケール結果
が得られるが、処理時間が５分の高能率デスケールの場
合には脱スケール結果は不十分でありあるいは不良であ
る。The present inventors have annealed a hot-rolled austenitic stainless steel (JIS SUS304 stainless steel),
The steel band was descaled by changing the acid of the preliminary series and the finishing series. The results are shown in Table 2. Numbers 11-1
No. 4 uses hydrochloric acid or sulfuric acid for the preliminary series and nitric acid-for the finishing series.
This is a conventional example using hydrofluoric acid. In this case, each processing time is 1
Good descaling results are obtained at low line speeds at 0 minutes, but poor or poor descaling results at high efficiency descaling times of 5 minutes.
【００２５】[0025]
【表２】 [Table 2]
【００２６】番号５は予備系列にも硝酸−弗酸を用いた
例である。この際の予備系列の液は仕上系列で使用した
ものではないが、脱スケール性は不十分である。番号１
６は予備系列に本発明よりも希薄な硫酸−弗酸の酸洗液
を用いた比較例であり、番号１７は仕上系列に本発明よ
りも希薄な酸洗液を用いた比較例である。これ等の場合
に、処理時間が５分の高能率デスケーリングを行うと、
脱スケールは不十分となる。No. 5 is an example in which nitric acid and hydrofluoric acid are also used in the preliminary series. At this time, the liquid in the preliminary series was not used in the finishing series, but the descalability was insufficient. Number 1
No. 6 is a comparative example using a sulfuric acid-hydrofluoric acid pickling solution which is more dilute than the present invention in the preliminary series, and No. 17 is a comparative example using a dilute pickling solution less than the present invention in the finishing series. In these cases, performing a high-efficiency descaling with a processing time of 5 minutes,
Descaling is insufficient.
【００２７】番号１８及び１９は予備系列および仕上系
列の双方に本発明でそれぞれ特定した硫酸−弗酸の酸洗
液を用いた例である。この際には処理時間が１０分の、
ライン速度が遅い場合も、また処理時間が５分の高能率
デスケールの場合も、極めて優れた脱スケール結果が得
られた。Nos. 18 and 19 are examples in which the pickling solution of sulfuric acid / hydrofluoric acid specified in the present invention was used for both the preliminary series and the finishing series. In this case, the processing time is 10 minutes,
Very good descaling results were obtained both at low line speeds and at high efficiency descaling times of 5 minutes.
【００２８】[0028]
【発明の効果】本発明によると、硝酸を用いないで、且
つ従来よりも高能率で、ステンレス鋼のスケールを除去
する事ができる。本発明を線材のデスケーリングの実施
例について述べたが、本発明はステンレス鋼板、ステン
レス鋼パイプ、ステンレス棒鋼などの形状の異なるステ
ンレス鋼のデスケーリングにも適用できることはいうま
でもない。According to the present invention, the scale of stainless steel can be removed without using nitric acid and with higher efficiency than before. Although the present invention has been described with respect to the embodiment of the descaling of the wire rod, it is needless to say that the present invention can be applied to descaling of stainless steel having different shapes such as a stainless steel plate, a stainless steel pipe, and a stainless steel bar.
Claims (8)
洗槽を有する予備系列と、溶融アルカリを収納したソル
トバスと、１または２以上の酸洗槽を有する仕上系列と
を順次配してなるステンレス鋼のデスケール装置におい
て、何れの酸洗槽にも硝酸を含有する酸洗液を用いる事
なく、また予備系列と仕上系列のそれぞれの少なくとも
１の酸洗槽を硫酸−弗酸の酸洗槽とし、仕上系列の硫酸
−弗酸の酸洗槽の使用済みの液を予備系列の硫酸−弗酸
の酸洗槽に供給する構造とした事を特徴とする、ステン
レス鋼のデスケール装置。1. A preliminary system having one or two or more pickling tanks, a salt bath containing a molten alkali, and a finishing system having one or two or more pickling tanks. In a stainless steel descaling apparatus, a pickling tank containing nitric acid is not used in any of the pickling tanks, and at least one of the preparatory line and the finishing line is sulfuric acid-fluoride. A stainless steel pickling tank, wherein the used liquid of the finishing sulfuric acid / hydrofluoric acid pickling tank is supplied to a preliminary sulfuric acid / hydrofluoric acid pickling tank. Descaler.
２５〜６０ｇ／Ｌ，ＨＦ：３〜１０ｇ／Ｌの硫酸−弗酸
の酸洗槽であり、仕上系列の硫酸−弗酸の酸洗槽が、硫
酸４０〜８０ｇ／Ｌ，ＨＦ：５〜１５ｇ／Ｌ，Ｆｅ3+＞
５ｇ／Ｌの硫酸−弗酸の酸洗槽である事を特徴とする、
請求項１に記載のフェライト系ステンレス鋼のデスケー
ル装置。2. A sulfuric acid-hydrofluoric acid pickling tank of a preliminary series comprises sulfuric acid:
25 to 60 g / L, HF: 3 to 10 g / L sulfuric acid / hydrofluoric acid pickling tank. The finishing series sulfuric acid / hydrofluoric acid pickling tank is 40 to 80 g / L sulfuric acid, 5 to 15 g HF. / L, Fe 3+ >
A pickling tank of 5 g / L sulfuric acid-hydrofluoric acid,
The descaling device for ferritic stainless steel according to claim 1.
６０〜２００ｇ／Ｌ，ＨＦ：１０〜２５ｇ／Ｌの硫酸−
弗酸の酸洗槽であり、仕上系列の硫酸−弗酸の酸洗槽が
Ｈ2ＳＯ4：１００〜２５０ｇ／Ｌ，ＨＦ：１５〜５０ｇ
／Ｌ，Ｆｅ3+＞５ｇ／Ｌの硫酸−弗酸の酸洗槽である事
を特徴とする、請求項１に記載のオーステナイト系ステ
ンレス鋼のデスケール装置。3. A sulfuric acid-hydrofluoric acid pickling tank of a preliminary series comprises sulfuric acid:
60-200 g / L, HF: 10-25 g / L sulfuric acid
A pickling bath hydrofluoric acid, sulfuric finishing sequence - pickling bath hydrofluoric acid is H 2 SO 4: 100~250g / L , HF: 15~50g
2. The austenitic stainless steel descaling apparatus according to claim 1, wherein the pickling tank is a sulfuric acid / hydrofluoric acid pickling tank of / L, Fe 3+ > 5 g / L.
℃の硫酸−弗酸の酸洗液であることを特徴とする請求項
１〜３の何れかに記載のステンレス鋼のデスケール装
置。4. A pickling solution of sulfuric acid-hydrofluoric acid having a temperature of 35-65.
The descaling device for stainless steel according to any one of claims 1 to 3, which is a pickling solution of sulfuric acid and hydrofluoric acid at a temperature of ° C.
化還元電位を＋２５０ｍＶ以上に維持し浴中のＦｅ2+を
一定割合でＦｅ3+に変換するための過酸化水素を添加す
る仕上系列の硫酸-弗酸の酸洗槽であることを特徴とす
る、請求項１から４の何れかに記載のステンレス鋼のデ
スケール装置。5. A finishing series sulfuric acid-hydrofluoric acid pickling tank for maintaining the oxidation-reduction potential of the bath at +250 mV or higher and converting Fe 2+ in the bath to Fe 3+ at a constant rate. The descaling device for stainless steel according to any one of claims 1 to 4, wherein the device is a sulfuric acid-hydrofluoric acid pickling tank of a finishing series to which is added.
列の硫酸−弗酸の酸洗槽の一方あるいは双方が、２０〜
３０Ｎｍ3／ｈｒ／ｍ3当たりの空気を連続的に導入する
硫酸−弗酸の酸洗槽であることを特徴とする、請求項１
から５の何れかに記載のステンレス鋼のデスケール装
置。6. A sulfuric acid / hydrofluoric acid pickling tank of a preparatory series and / or a sulfuric acid / hydrofluoric acid pickling tank of a finishing series may be 20 to 20.
The 30Nm 3 / hr / m 3 per air sulfate continuously introducing - characterized in that it is a pickling bath hydrofluoric acid, according to claim 1
The descaling device for stainless steel according to any one of claims 1 to 5.
スケール装置によりデスケーリングを行う事を特徴とす
る、フェライト系ステンレス鋼のデスケール方法。7. A descaling method for ferritic stainless steel, wherein descaling is performed by the descaling apparatus according to any one of claims 2, 4, 5, and 6.
スケール装置によりデスケーリングを行う事を特徴とす
る、オーステナイト系ステンレス鋼のデスケール方法。8. A method for descaling austenitic stainless steel, wherein descaling is performed by the descaling apparatus according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20562897A JP3868069B2 (en) | 1997-07-31 | 1997-07-31 | Stainless steel descaling apparatus and descaling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20562897A JP3868069B2 (en) | 1997-07-31 | 1997-07-31 | Stainless steel descaling apparatus and descaling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1150283A true JPH1150283A (en) | 1999-02-23 |
| JP3868069B2 JP3868069B2 (en) | 2007-01-17 |
Family
ID=16510048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20562897A Expired - Lifetime JP3868069B2 (en) | 1997-07-31 | 1997-07-31 | Stainless steel descaling apparatus and descaling method |
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| Country | Link |
|---|---|
| JP (1) | JP3868069B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012091412A3 (en) * | 2010-12-28 | 2012-10-04 | 주식회사 포스코 | Eco-friendly high-speed pickling process for producing a low-chrome ferrite-based cold-rolled stainless steel sheet having superior surface quality |
-
1997
- 1997-07-31 JP JP20562897A patent/JP3868069B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012091412A3 (en) * | 2010-12-28 | 2012-10-04 | 주식회사 포스코 | Eco-friendly high-speed pickling process for producing a low-chrome ferrite-based cold-rolled stainless steel sheet having superior surface quality |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3868069B2 (en) | 2007-01-17 |
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