JPH01165783A - Method for refreshing pickling bath for band stainless steel - Google Patents
Method for refreshing pickling bath for band stainless steelInfo
- Publication number
- JPH01165783A JPH01165783A JP32369387A JP32369387A JPH01165783A JP H01165783 A JPH01165783 A JP H01165783A JP 32369387 A JP32369387 A JP 32369387A JP 32369387 A JP32369387 A JP 32369387A JP H01165783 A JPH01165783 A JP H01165783A
- Authority
- JP
- Japan
- Prior art keywords
- pickling
- bath
- tank
- soln
- stainless steel
- 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.)
- Pending
Links
- 238000005554 pickling Methods 0.000 title claims abstract description 51
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 11
- 239000010935 stainless steel Substances 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002253 acid Substances 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000010802 sludge Substances 0.000 abstract description 3
- 239000007921 spray Substances 0.000 abstract description 3
- 238000010992 reflux Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 7
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- LVXIMLLVSSOUNN-UHFFFAOYSA-N fluorine;nitric acid Chemical compound [F].O[N+]([O-])=O LVXIMLLVSSOUNN-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- SHXXPRJOPFJRHA-UHFFFAOYSA-K iron(iii) fluoride Chemical compound F[Fe](F)F SHXXPRJOPFJRHA-UHFFFAOYSA-K 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、ステンレス綱帯用の酸洗浴の更新方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for renewing a pickling bath for stainless steel rope.
〈従来の技術〉
−Ｓに、ステンレス鋼帯をフッ素硝酸浴で酸洗する場合
、以下の溶解反応により、酸洗いが進行する。<Prior Art> - When a stainless steel strip is pickled in a fluorine-nitric acid bath, the pickling progresses through the following dissolution reaction.
Ｆｅ ＋２ ＨＦ ＝Ｈ寥↑＋Ｆ ｅ ” ” ＋ ２
Ｆ −−−−−−−−−−−（Ａ）酸洗いの初期には
、囚式の右の方向に反応が進行するが、浴中への溶解第
一鉄（Ｆｅ”）の蓄積が進むにつれて、反応は平衡に達
し、酸洗いが十分施せな（なる、さらに固成の右の方向
に反応を進める為には、ＨＦを大量に投入しつづけなけ
ればならず、安定した状態で酸洗いを行う事が次第に困
難となる。同様の事が硫酸浴についても、あてはまる。Fe +2 HF =H↑+Fe ” ” + 2
F ---------- (A) At the beginning of pickling, the reaction proceeds in the right direction of the prison equation, but the accumulation of dissolved ferrous iron (Fe'') in the bath increases. As the reaction progresses, it reaches equilibrium, and the acid washing cannot be carried out sufficiently. Washing becomes increasingly difficult.The same applies to sulfuric acid baths.
そこで、この様な問題を解消するため特許出願公表昭６
２−５０１９８１号公報において、浴中に直接空気を吹
き込み以下の反応による浴の酸化によって溶解第一鉄（
Ｆｅ”）を減らす方法が提案されている。Therefore, in order to solve this problem, the patent application was published in 1986.
In Japanese Patent No. 2-501981, dissolved ferrous iron (
A method of reducing Fe'') has been proposed.
４ Ｆｅ” ＋ Ｏｔ ＋ ４ Ｈ′″；” ４ Ｆｅ
” ＋ ２ ＨＩ３−＝−■しかし、この様に浴中に導
管等で空気を直接注入する方法では、放出された空気が
直ちに集合して大きな気泡となり易く、空気と浴との接
触面積が小さくなり、大きな酸化能力が得られないこと
、さらに酸化能力を向上させようと注入空気量を増やし
ても浴を撹拌するだけであり、むしろ浴槽底に沈殿堆積
しているスラッジを、製品の上にまで巻上げ、製品を汚
し易いという欠点が有る。4 Fe" + Ot + 4 H'";" 4 Fe
” + 2 HI3-=-■ However, with this method of directly injecting air into the bath through a conduit, etc., the released air tends to collect quickly and form large bubbles, and the contact area between the air and the bath is small. In addition, increasing the amount of air injected to improve the oxidizing ability only stirs the bath, and rather removes the sludge that has settled at the bottom of the bath onto the top of the product. It has the disadvantage that it easily winds up and stains the product.
〈発明が解決しようとする問題点〉
本発明はより効率的な酸洗浴中への空気導入による酸洗
浴の更新法を提案するものであり、よって酸洗能力の向
上ならびにフッ酸の消費量の減少をはかるものである。<Problems to be Solved by the Invention> The present invention proposes a method for renewing a pickling bath by introducing air into the pickling bath more efficiently, thereby improving the pickling ability and reducing the amount of hydrofluoric acid consumed. It is intended to reduce the
〈問題解決のための手段〉
本発明は、フッ酸を含む酸洗液でステンレス鋼帯を連続
的に酸洗する際に、酸洗浴槽とは別個に設置したタンク
に該酸洗浴槽内の酸洗液を導き、該タンク内で該酸洗液
に空気を接触させ該酸洗液中の２価のＦｅイオンを３価
のＦｅイオンに酸化し、次いで該酸洗液を該酸洗浴槽へ
戻すことを特徴とするステンレス銅帯用酸洗浴の更新方
法である。<Means for Solving the Problem> The present invention provides a method for continuously pickling stainless steel strips with a pickling solution containing hydrofluoric acid, in which a tank installed separately from the pickling bath is used to remove water in the pickling bath. A pickling solution is introduced into the tank, and divalent Fe ions in the pickling solution are oxidized to trivalent Fe ions by contacting air with the pickling solution in the tank, and then the pickling solution is transferred to the pickling bath. This is a method for renewing a pickling bath for stainless copper strips, which is characterized by returning the pickling bath to
〈作 用〉
本発明者は、酸洗液をシャワー状に散布し、霧状にして
空気と接触させる実験を行ったところ、浴の酸化能率が
はるかに向上する事を知見した。<Function> The inventor of the present invention conducted an experiment in which the pickling solution was sprayed in the form of a shower, made into a mist, and brought into contact with air, and found that the oxidation efficiency of the bath was greatly improved.
本発明は、この知見をもとに浴槽とは別個に設置したタ
ンク上部より、酸洗液をシャワー状に散布し、酸洗い操
作の間、浴槽とタンクの間を連続的に循環させて能率的
に溶解第一鉄（Ｆｅ”）を溶解第二鉄（Ｆｅ３°）に酸
化し、浴の酸洗能力を高水準で維持するようにしたもの
である。Based on this knowledge, the present invention sprays the pickling liquid in a shower form from the top of a tank installed separately from the bathtub, and continuously circulates between the bathtub and tank during the pickling operation to increase efficiency. This method oxidizes molten ferrous iron (Fe'') to molten ferric iron (Fe3°) to maintain the pickling ability of the bath at a high level.
第１図は、本発明の説明図で、酸洗槽１１内の酸洗液は
吸込口９から吸い込まれ、揚水管２を通ってタンク３に
導かれる。タンク内部で酸洗液はシャワー状に放出され
る。さらにタン夛３の底部にたまった酸洗液は環流管６
を通って、再び浴槽１１に戻る。なおタンク中にはプロ
ワ−４により強制的に空気を吹き込むことが望ましい、
５は排気孔である。FIG. 1 is an explanatory diagram of the present invention, in which the pickling liquid in the pickling tank 11 is sucked in through the suction port 9 and guided to the tank 3 through the water pump 2. Inside the tank, the pickling liquid is released in the form of a shower. Furthermore, the pickling liquid accumulated at the bottom of the tank 3 is removed from the reflux pipe 6.
and return to the bathtub 11 again. It is desirable to forcefully blow air into the tank using blower 4.
5 is an exhaust hole.
また酸洗液の循環にあたってはタンク内で液が適当に飛
散するように４ ｋｇ／ｃｄ〜２０ｋｇ／ｃＴｊの圧力
で循環させるのが好ましい、循環量は、浴全量が１時間
に１回以上循環できる程度が望ましい。In addition, when circulating the pickling solution, it is preferable to circulate the pickling solution at a pressure of 4 kg/cd to 20 kg/cTj so that the solution is dispersed appropriately within the tank. It is desirable to be able to do so.
第２図は、タンク内への吹込空気量を８０ＯＮｒｒｆ／
Ｈに一定し液の循環量を変化させた場合の、溶解第一鉄
（ｐｅ！＋）濃度および溶解第二鉄（Ｆｅ”°）濃度と
フッ酸の消費量の関係を示したものである。Figure 2 shows the amount of air blown into the tank at 80ONrrf/
This figure shows the relationship between the dissolved ferrous iron (pe!+) concentration, dissolved ferric iron (Fe”°) concentration, and the amount of hydrofluoric acid consumed when the amount of liquid circulation is changed while keeping the temperature constant at H. .
これによれば浴の循環量が０ｒｒｒ／Ｈの場合は、溶解
第二鉄（Ｆｅ”）の濃度は２．５ｇ／ｊ！と極めて低く
、溶解第一鉄（Ｆｅ”）の濃度は６７．５ ｇ ／ ｉ
ｔであり、フッ酸（ＩＦ）消費量は１．６ｋｇ／ｌｏｎ
と極めて高い、浴の循環量が１５ｎｆ／Ｈの場合は、
溶解第二鉄（Ｆｅ”）の濃度は１５．５ ｇ ／ ｌに
上昇し、７７酸（ＩＦ）消費量は０．９８ｋｇ／ｌｏｎ
に低下する。浴の循環量が６５ｎ？／Ｈの場合は、溶解
第二鉄（Ｆｅ”）の濃度は２７．５ ｇ ／ ｊ！に上
昇し、フッ酸（ＨＦ）消費量は０．６３ｋｇ／ ｔｏｎ
に低下する。このように浴の循環量を６５ｒｒｆ／Ｈ程
度まで上げると、循環を全く行わない場合に比ベフン酸
（ＨＦ）の消費量は、約１７３に激減した。According to this, when the circulation rate of the bath is 0 rrr/H, the concentration of dissolved ferric iron (Fe'') is extremely low at 2.5 g/j!, and the concentration of dissolved ferrous iron (Fe'') is 67. 5g/i
t, and the hydrofluoric acid (IF) consumption is 1.6 kg/lon
If the bath circulation rate is extremely high, 15nf/H,
The concentration of dissolved ferric iron (Fe”) rose to 15.5 g/l and the 77 acid (IF) consumption was 0.98 kg/lon
decreases to Is the bath circulation amount 65n? /H, the concentration of dissolved ferric iron (Fe”) increases to 27.5 g/j!, and the hydrofluoric acid (HF) consumption is 0.63 kg/ton.
decreases to When the circulation rate of the bath was increased to about 65 rrf/H in this way, the consumption rate of befunic acid (HF) sharply decreased to about 173 when no circulation was performed.
〈実施例〉
実施例１
幅が１ｍ厚さ４．０ｍｍの１７％Ｃｒ含有フェライトス
テンレス鋼帯を、長さ２０ｍ１幅２ｍで約３８ｒｒｌの
酸洗い浴を有する浴槽中で酸洗いした。帯は２０ｍ／分
の速度で浴中を通過し、次いで温水リンスが施される。Examples Example 1 A 17% Cr-containing ferritic stainless steel strip having a width of 1 m and a thickness of 4.0 mm was pickled in a bath having a length of 20 m and a width of 2 m and a pickling bath of about 38 rrl. The strip passes through the bath at a speed of 20 m/min and is then subjected to a hot water rinse.
酸洗浴はＨＦ ５５ｇ／ ｌとＨＮＯ３１５０ｇ ／
１と、溶解しているフン化第二鉄に由来するＦｅ” ２
５ｇ／ １．とを含有し、残部水からなる浴を用いた。The pickling bath contains HF 55g/l and HNO3 150g/l.
1 and Fe” derived from dissolved ferric fluoride 2
5g/1. A bath was used containing: and the remainder was water.
浴の温度は５０〜６５°Ｃであった。The bath temperature was 50-65°C.
酸洗中の液の循環流量を６５Ｎｒｄ／ｈとし、空気吹込
量は８０ＯＮ ｎ（／ Ｈとした。この状態を維持した
まま溶解第二鉄（ｐｅ３＋）濃度を２’５〜３５ｇ／Ａ
に保持し、３日の間充分な酸洗いを実施する事が出来た
。なお、前記実施例では、金属鋼帯としてステンレス鋼
帯を用いた例について説明したが、他の金属鋼帯にも適
用出来るのはもちろんである。また、フッ素硝酸浴を用
いた例について説明したが硫酸浴でも適用出来る。The circulation flow rate of the solution during pickling was 65Nrd/h, and the air blowing amount was 80ON n(/H).While maintaining this state, the dissolved ferric iron (PE3+) concentration was increased from 2'5 to 35g/A.
It was possible to carry out sufficient pickling for 3 days. In addition, although the said Example demonstrated the example which used the stainless steel strip as a metal steel strip, it is of course applicable to other metal steel strips. Further, although an example using a fluorine-nitric acid bath has been described, a sulfuric acid bath can also be used.
〈発明の効果〉
本発明により、浴を空気により酸化する効率が向上し、
この結果、酸洗いで消費する酸の量を大幅に削減する事
ができた。<Effects of the Invention> According to the present invention, the efficiency of oxidizing the bath with air is improved,
As a result, we were able to significantly reduce the amount of acid consumed during pickling.
また、浴槽内に空気を放出する方式ではないため、酸化
能力を上げるために、浴の循環流を大幅に引き上げても
、浴槽底のスラッジを捲き上げて、製品を汚すことが無
い。In addition, since the system does not release air into the bathtub, even if the circulation flow of the bath is significantly increased to increase the oxidation ability, the sludge at the bottom of the bathtub will not be stirred up and contaminate the product.
第１図は、本発明方法を実施する装置の説明図、第２図
は、浴の循環量と浴中の溶解第一鉄（Ｆｅ”″）。
溶解第二鉄（Ｆｅ”）濃度および酸洗いするステンレス
鋼１ｔｏｎ 当たり消費するフッ酸（ＨＦ）量との関係
を示すグラフである。
１・・・ポンプ、 ２・・・揚水管、３・・
・タンク、 ４・・・ブロワ−１５・・・排
気孔、 ６・・・環流管、７・・・ステンレ
ス鋼帯、 ８・・・環流孔、９・・・吸込口、
１０・・・ゴムロール、１１・・・浴槽、
１２・・・スプレーノズル。
特許出願人 川崎製鉄株式会社
第１図FIG. 1 is an explanatory diagram of an apparatus for carrying out the method of the present invention, and FIG. 2 shows the circulation amount of the bath and dissolved ferrous iron (Fe"") in the bath. It is a graph showing the relationship between the dissolved ferric (Fe) concentration and the amount of hydrofluoric acid (HF) consumed per 1 ton of stainless steel to be pickled. 1... Pump, 2... Lifting pipe, 3...
・Tank, 4...Blower 15...Exhaust hole, 6...Recirculation pipe, 7...Stainless steel strip, 8...Recirculation hole, 9...Suction port,
10... Rubber roll, 11... Bathtub,
12...Spray nozzle. Patent applicant: Kawasaki Steel Corporation Figure 1
Claims (1)
る際に、酸洗浴槽とは別個に設置したタンクに該酸洗浴
槽内の酸洗液を導き、該タンク内で該酸洗液に空気を接
触させ該酸洗液中の２価のＦｅイオンを３価のＦｅイオ
ンに酸化し、次いで該酸洗液を該酸洗浴槽へ戻すことを
特徴とするステンレス鋼帯用酸洗浴の更新方法。When continuously pickling stainless steel strips with a pickling solution containing hydrofluoric acid, the pickling solution in the pickling bath is led to a tank installed separately from the pickling bath, and the acid is An acid for stainless steel strip, characterized in that air is brought into contact with the pickling solution to oxidize divalent Fe ions in the pickling solution to trivalent Fe ions, and then the pickling solution is returned to the pickling bath. How to update your washing bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32369387A JPH01165783A (en) | 1987-12-23 | 1987-12-23 | Method for refreshing pickling bath for band stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32369387A JPH01165783A (en) | 1987-12-23 | 1987-12-23 | Method for refreshing pickling bath for band stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01165783A true JPH01165783A (en) | 1989-06-29 |
Family
ID=18157543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32369387A Pending JPH01165783A (en) | 1987-12-23 | 1987-12-23 | Method for refreshing pickling bath for band stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01165783A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354383A (en) * | 1991-03-29 | 1994-10-11 | Itb, S.R.L. | Process for pickling and passivating stainless steel without using nitric acid |
| WO1995034695A1 (en) * | 1994-06-15 | 1995-12-21 | Usinor Sacilor | Method for pickling metal materials |
| EP0795628A1 (en) * | 1996-03-14 | 1997-09-17 | CONDOROIL IMPIANTI s.r.l. | Pickling of stainless steels while continuously reoxidizing catalytically the pickling solution |
| WO1999027162A1 (en) * | 1997-11-24 | 1999-06-03 | Acciai Speciali Terni S.P.A. | Method for pickling steel products |
| FR2772050A1 (en) * | 1997-12-10 | 1999-06-11 | Imphy Sa | PROCESS FOR STRIPPING STEEL AND IN PARTICULAR STAINLESS STEEL |
| WO1999031296A1 (en) * | 1997-12-12 | 1999-06-24 | Henkel Kommanditgesellschaft Auf Aktien | Method for pickling and passivating special steel |
| JPWO2021140612A1 (en) * | 2020-01-09 | 2021-07-15 |
-
1987
- 1987-12-23 JP JP32369387A patent/JPH01165783A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354383A (en) * | 1991-03-29 | 1994-10-11 | Itb, S.R.L. | Process for pickling and passivating stainless steel without using nitric acid |
| WO1995034695A1 (en) * | 1994-06-15 | 1995-12-21 | Usinor Sacilor | Method for pickling metal materials |
| FR2721328A1 (en) * | 1994-06-15 | 1995-12-22 | Ugine Sa | Process for pickling metallic materials, in particular alloy steel, stainless steel or titanium alloy, with a solution of the type containing ferric ions in an acid medium. |
| EP0795628A1 (en) * | 1996-03-14 | 1997-09-17 | CONDOROIL IMPIANTI s.r.l. | Pickling of stainless steels while continuously reoxidizing catalytically the pickling solution |
| US5785765A (en) * | 1996-03-14 | 1998-07-28 | Condoroil Impianti S.R.L. | Pickling of stainless steels while continuously reoxidizing catalytically the pickling solution |
| WO1999027162A1 (en) * | 1997-11-24 | 1999-06-03 | Acciai Speciali Terni S.P.A. | Method for pickling steel products |
| FR2772050A1 (en) * | 1997-12-10 | 1999-06-11 | Imphy Sa | PROCESS FOR STRIPPING STEEL AND IN PARTICULAR STAINLESS STEEL |
| EP0922787A1 (en) * | 1997-12-10 | 1999-06-16 | Imphy S.A. | Process for pickling stainless steel |
| WO1999031296A1 (en) * | 1997-12-12 | 1999-06-24 | Henkel Kommanditgesellschaft Auf Aktien | Method for pickling and passivating special steel |
| JPWO2021140612A1 (en) * | 2020-01-09 | 2021-07-15 | ||
| WO2021140612A1 (en) * | 2020-01-09 | 2021-07-15 | Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 | Steel plate pickling method and pickling device |
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