JPH0835086A - Method for pickling nickel-base stainless steel sheet - Google Patents

Method for pickling nickel-base stainless steel sheet

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Publication number
JPH0835086A
JPH0835086A JP16982494A JP16982494A JPH0835086A JP H0835086 A JPH0835086 A JP H0835086A JP 16982494 A JP16982494 A JP 16982494A JP 16982494 A JP16982494 A JP 16982494A JP H0835086 A JPH0835086 A JP H0835086A
Authority
JP
Japan
Prior art keywords
pickling
acid
steel sheet
stainless steel
base stainless
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
Application number
JP16982494A
Other languages
Japanese (ja)
Other versions
JP3299389B2 (en
Inventor
Ikuya Yamamoto
郁也 山本
Ritsushi Miyazaki
律志 宮崎
Hisashi Yasuda
久 安田
Ryoichi Shimomura
良一 下村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP16982494A priority Critical patent/JP3299389B2/en
Publication of JPH0835086A publication Critical patent/JPH0835086A/en
Application granted granted Critical
Publication of JP3299389B2 publication Critical patent/JP3299389B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

PURPOSE:To enable the pickling of Ni-base stainless by sulfuric acid at a low cost, in Ni-base stainless, by enabling its whitening treatment after pickling by sulfuric acid. CONSTITUTION:An Ni-base stainless steel sheet is pickled by sulfuric acid. After that, the surface of the steel sheet is subjected to cleaning treatment by a whitening pickling soln. having 0.5 to 20wt.%. hydrochloric acid concn. and 3 to 20wt.% nitric acid concn., and thereafter, washing treatment is executed. The whitening pickling soln. furthermore may contain a surfactant constituted of a urea compound and organic acid by 1 to 5wt.%. In this way, the pickling of Ni-base stainless is made possible, and remarkable effects such as the reduction of equipment and building cost, the reduction of acid soln. running cost, the elimination of nitric and hydrofluoric acid sludge treatment, the evasion of the risk to hydrofluoric acid, the reduction of equipment maintenance cost or the like are given. Moreover, in a line in which both of Cr and Ni-base stainless are produced, the equipment, operating time and cost required for the change of the son. are made needless.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、Ｎｉ系（オーステナイ
ト系）ステンレス鋼板の酸洗方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickling method for Ni (austenitic) stainless steel sheets.

【０００２】[0002]

【従来の技術】Ｃｒ系ステンレス鋼板の脱スケール方法
としては、特開昭６４−２８８号公報に開示されている
ように、硫酸酸洗を行うことが一般的である。2. Description of the Related Art As a method for descaling a Cr-based stainless steel sheet, it is common to carry out sulfuric acid pickling, as disclosed in Japanese Patent Laid-Open No. 64-288.

【０００３】ところが、Ｎｉ系ステンレスを硫酸酸洗し
た場合、仕上がり表面が黒色化し、品質の確保が困難と
なる。この黒色スマットはブラッシング等のメカニカル
な方法では除去できない。However, when Ni-based stainless steel is washed with sulfuric acid, the finished surface is blackened, and it is difficult to secure quality. This black smut cannot be removed by a mechanical method such as brushing.

【０００４】そこで、Ｎｉ系ステンレス鋼板の熱間圧延
後の表面酸化スケールを除去する方法として、従来は、
熱延鋼板にショットブラスト等のメカニカルデスケーリ
ングを施した後、適正温度に予熱して適正濃度の硝弗酸
水溶液で酸洗する方法（特開昭６１−２４５９１２号公
報、特開昭６１−４９７０６号公報等）や、中性塩電解
等の方式が採られている。Therefore, as a method for removing the surface oxide scale after hot rolling of a Ni-based stainless steel sheet, conventionally,
A method of subjecting a hot rolled steel sheet to mechanical descaling such as shot blasting, followed by preheating to an appropriate temperature and pickling with a nitric hydrofluoric acid aqueous solution having an appropriate concentration (Japanese Patent Laid-Open Nos. 61-245912 and 61-49706). No. gazette) and neutral salt electrolysis.

【０００５】[0005]

【発明が解決しようとする課題】ところが、硝弗酸水溶
液で酸洗する方法では、強酸を用いるため、酸洗槽及び
循環系の設備を硝弗酸に適用可能な耐酸構造とする必要
があり、初期設備コスト及び設備維持コストが高いとい
う問題があり、また、中性塩電解法では、酸コスト及び
電解コストが高いという問題があった。However, in the method of pickling with an aqueous solution of nitric hydrofluoric acid, since a strong acid is used, it is necessary to provide the pickling tank and the circulation system with an acid resistant structure applicable to hydrofluoric acid. The initial salt cost and the facility maintenance cost are high, and the neutral salt electrolysis method has a problem that the acid cost and the electrolysis cost are high.

【０００６】本発明が解決すべき課題は、Ｎｉ系ステン
レスにおいて、硫酸酸洗後の白色化処理を可能にするこ
とにより、コストの安いＮｉ系ステンレスの硫酸酸洗を
可能とすることにある。The problem to be solved by the present invention is to enable the sulfuric acid pickling of Ni-based stainless steel at a low cost by enabling the whitening treatment after the sulfuric acid pickling in the Ni-based stainless steel.

【０００７】[0007]

【課題を解決するための手段】前記課題を解決するた
め、本発明のＮｉ系ステンレス鋼板の酸洗方法は、Ｎｉ
系ステンレス鋼板の硫酸酸洗後、塩酸０．５〜２０重量
％、硝酸３〜２０重量％の濃度の白色化酸洗液で当該鋼
板の表面の洗浄処理を行い、その後、水洗処理を行うも
のである。In order to solve the above problems, the method for pickling Ni-based stainless steel sheet according to the present invention is
After the sulfuric acid pickling of the stainless steel sheet, the surface of the steel sheet is washed with a whitening pickling solution with a concentration of hydrochloric acid of 0.5 to 20% by weight and nitric acid of 3 to 20% by weight, and then washed with water. Is.

【０００８】前記白色化酸洗液にはさらに、尿素化合物
と有機酸からなる界面活性剤を１〜５重量％含むものを
用いることができる。The whitening pickling solution may further contain a surfactant containing a urea compound and an organic acid in an amount of 1 to 5% by weight.

【０００９】[0009]

【作用】本発明においては、まず硫酸酸洗によりデスケ
ーリングを行い、黒色化した表面を硝酸と塩酸の混合酸
で洗うことにより表層を除去し、Ｎｉ系ステンレス特有
の銀白色の表面を得た後、残留酸を水で洗う。このと
き、白色化酸洗液に界面活性剤を加えることにより、鋼
板表面の過剰溶削による歩留低下防止及び窒素酸化物ガ
ス（ＮＯX ガス）の発生抑制を行う。In the present invention, first, descaling is performed by sulfuric acid pickling, the blackened surface is washed with a mixed acid of nitric acid and hydrochloric acid to remove the surface layer, and a silver-white surface peculiar to Ni-based stainless steel is obtained. After that, the residual acid is washed with water. At this time, by adding a surfactant to the whitening pickling solution, it performs generation control of yield reduction prevention due to excessive scarfing of steel sheet surface and nitrogen oxide gas (NO X gas).

【００１０】[0010]

【実施例】以下、本発明を実施例を参照しながら具体的
に説明する。図１は本発明の酸洗工程を示す概略図であ
る。図中１は熱延鋼板２を巻きつけたホットコイル、３
は酸洗済コイルである。ホットコイル１と酸洗済コイル
３との間には、メカニカルデスケーリング工程Ｉ、本発
明の硫酸酸洗工程II、白色化処理工程III 及び温水水洗
工程IVが行われる。メカニカルデスケーリング工程Ｉ
は、公知のショットブラスト等で鋼板２表面のスケール
にクラックを入れ、粗大なスケールを除去する。次の硫
酸酸洗工程IIでは、９０℃に加熱した濃度硫酸３００ｇ
／リットルの酸を鋼板に浸漬するか吹き付ける。図２は
酸洗時間と溶削量の関係を示したもので、４μｍの溶削
が行われる６０秒程度で酸洗を終了する。EXAMPLES The present invention will be specifically described below with reference to examples. FIG. 1 is a schematic view showing the pickling step of the present invention. In the figure, 1 is a hot coil around which a hot rolled steel plate 2 is wound, 3
Is a pickled coil. Between the hot coil 1 and the pickled coil 3, a mechanical descaling step I, a sulfuric acid pickling step II of the present invention, a whitening treatment step III and a hot water washing step IV are performed. Mechanical descaling process I
In order to remove the coarse scale, the scale on the surface of the steel plate 2 is cracked by known shot blasting or the like. In the next sulfuric acid pickling step II, 300 g of concentrated sulfuric acid heated to 90 ° C
Immerse or spray / liter of acid on the steel plate. FIG. 2 shows the relationship between the pickling time and the amount of scraping, and the pickling is completed in about 60 seconds when the scraping of 4 μm is performed.

【００１１】ついで、ＨＮＯ3 とＨＣｌを混合した酸液
に、尿素化合物と有機酸からなる界面活性剤５％を加え
た白色化酸洗液に鋼板を浸漬するか吹き付ける。Then, the steel sheet is dipped or sprayed in a whitening pickling solution prepared by adding 5% of a surfactant consisting of a urea compound and an organic acid to an acid solution prepared by mixing HNO 3 and HCl.

【００１２】図３はＨＮＯ3 とＨＣｌの濃度を変えてい
った場合の鋼板の表面の色の変化を示したものである。
図中のプロットのマークの○は白色、△は灰色（検査可
の限界）、×は黒（検査不能）を示している。Ｃｒ系ス
テンレスではＨＮＯ3 ５〜２０％単独で白色化できる
が、Ｎｉ系ステンレスでは、ＨＣｌが０％の場合は白色
化しなかった。FIG. 3 shows changes in the color of the surface of the steel sheet when the concentrations of HNO 3 and HCl were changed.
In the plot marks in the figure, ◯ indicates white, Δ indicates gray (limit of inspection possible), and × indicates black (inspection impossible). With Cr-based stainless steel, HNO 3 5-20% alone can be whitened, but with Ni-based stainless steel, whitening was not achieved when HCl was 0%.

【００１３】図４はＨＣｌを５％で固定した場合のＨＮ
Ｏ3 の濃度による板表面の色を、図５はＨＮＯ3 を１５
％で固定した場合のＨＣｌの濃度による板表面の色をそ
れぞれ示している。FIG. 4 shows HN when HCl is fixed at 5%.
The color density by the plate surface of the O 3, 5 to HNO 3 15
The color of the plate surface depending on the concentration of HCl when fixed in% is shown.

【００１４】これらの測定結果が示すように、ＨＮＯ3
の濃度３〜２０％、ＨＣｌの濃度０．５〜２０％が好適
範囲であることが判明した。As these measurement results show, HNO 3
It was found that the concentration of 3 to 20% and the concentration of HCl of 0.5 to 20% are in the suitable ranges.

【００１５】この濃度以上では、酸の濃度が高くなり過
ぎて無駄であるとともに、次の水洗工程で余分な水を要
する。Above this concentration, the acid concentration becomes too high, which is wasteful, and extra water is required in the next washing step.

【００１６】[0016]

【発明の効果】上述したように、本発明によれば、有効
な白色化処理を後で行うようにしたことにより、Ｎｉ系
ステンレスの硫酸酸洗が可能となり、同ステンレスに広
く利用されている、硝酸及び弗酸の混合液の使用をＣｒ
系ステンレスにて広く利用されている硫酸に変更できる
ため、設備建設費の低減、酸液ランニングコストの低
減、硝弗酸スラッジ処理の解消、弗酸に対する危険性の
回避、設備メンテナンス費用の低減等の顕著な効果があ
る。また、Ｃｒ及びＮｉ系ステンレス両者とも生産する
ラインでは液切替に必要な設備、作業時間、費用が不要
となる。As described above, according to the present invention, the effective whitening treatment is carried out later, so that the Ni-based stainless steel can be pickled with sulfuric acid and is widely used in the stainless steel. Use of a mixed solution of nitric acid and nitric acid with Cr
Since it can be changed to sulfuric acid, which is widely used in stainless steel, it reduces equipment construction costs, reduces acid liquid running costs, eliminates treatment with nitric hydrofluoric acid sludge, avoids the risk of hydrofluoric acid, reduces equipment maintenance costs, etc. There is a remarkable effect of. Further, in a line where both Cr and Ni-based stainless steel are produced, the equipment, working time and cost required for liquid switching are unnecessary.

【図面の簡単な説明】[Brief description of drawings]

【図１】 本発明の酸洗工程を示す概略図である。FIG. 1 is a schematic view showing a pickling step of the present invention.

【図２】 酸洗時間と溶削量の関係を示したグラフであ
る。FIG. 2 is a graph showing the relationship between pickling time and the amount of ablation.

【図３】 ＨＮＯ3 とＨＣｌの濃度を変えていった場合
の鋼板の表面の色の変化を示したグラフである。FIG. 3 is a graph showing changes in the color of the surface of the steel sheet when the concentrations of HNO 3 and HCl were changed.

【図４】 ＨＣｌの濃度を固定し、ＨＮＯ3 の濃度を変
えていった場合の鋼板の表面の色の変化を示したグラフ
である。FIG. 4 is a graph showing a change in color of the surface of a steel sheet when the concentration of HCl is fixed and the concentration of HNO 3 is changed.

【図５】 ＨＮＯ3 の濃度を固定し、ＨＣｌの濃度を変
えていった場合の鋼板の表面の色の変化を示したグラフ
である。FIG. 5 is a graph showing a change in color of the surface of the steel sheet when the concentration of HNO 3 is fixed and the concentration of HCl is changed.

【符号の説明】[Explanation of symbols]

１ ホットコイル、２ 鋼板、３ 酸洗済コイル 1 hot coil, 2 steel plate, 3 pickled coil

───────────────────────────────────────────────────── フロントページの続き (72)発明者 下村 良一 福岡県北九州市戸畑区飛幡町１番１号 新 日本製鐵株式会社八幡製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Shimomura 1-1, Toibata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Yawata Works

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 Ｎｉ系ステンレス鋼板の硫酸酸洗後、塩
酸０．５〜２０重量％、硝酸３〜２０重量％の濃度の白
色化酸洗液で当該鋼板の表面の洗浄処理を行い、その
後、水洗処理を行うことを特徴とするＮｉ系ステンレス
鋼板の酸洗方法。1. A Ni-based stainless steel sheet is washed with sulfuric acid, and then the surface of the steel sheet is washed with a whitening pickling solution having a concentration of 0.5 to 20% by weight of hydrochloric acid and 3 to 20% by weight of nitric acid. A method of pickling Ni-based stainless steel sheet, which comprises performing a water washing treatment. 【請求項２】 白色化酸洗液にはさらに、尿素化合物と
有機酸からなる界面活性剤を１〜５重量％含む、請求項
１記載のＮｉ系ステンレス鋼板の酸洗方法。2. The method for pickling Ni-based stainless steel sheet according to claim 1, wherein the whitening pickling solution further contains 1 to 5% by weight of a surfactant composed of a urea compound and an organic acid.
JP16982494A 1994-07-21 1994-07-21 Pickling method for Ni-based stainless steel sheet Expired - Fee Related JP3299389B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16982494A JP3299389B2 (en) 1994-07-21 1994-07-21 Pickling method for Ni-based stainless steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16982494A JP3299389B2 (en) 1994-07-21 1994-07-21 Pickling method for Ni-based stainless steel sheet

Publications (2)

Publication Number Publication Date
JPH0835086A true JPH0835086A (en) 1996-02-06
JP3299389B2 JP3299389B2 (en) 2002-07-08

Family

ID=15893589

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16982494A Expired - Fee Related JP3299389B2 (en) 1994-07-21 1994-07-21 Pickling method for Ni-based stainless steel sheet

Country Status (1)

Country Link
JP (1) JP3299389B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1699278A3 (en) * 1998-09-28 2007-04-18 Ibiden Co., Ltd. Multilayer printed wiring board and method for producing the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1699278A3 (en) * 1998-09-28 2007-04-18 Ibiden Co., Ltd. Multilayer printed wiring board and method for producing the same
US7504719B2 (en) 1998-09-28 2009-03-17 Ibiden Co., Ltd. Printed wiring board having a roughened surface formed on a metal layer, and method for producing the same
US7535095B1 (en) 1998-09-28 2009-05-19 Ibiden Co., Ltd. Printed wiring board and method for producing the same
US7994433B2 (en) 1998-09-28 2011-08-09 Ibiden Co., Ltd. Printed wiring board and method for producing the same
US8533943B2 (en) 1998-09-28 2013-09-17 Ibiden Co., Ltd. Printed wiring board and method for producing the same

Also Published As

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JP3299389B2 (en) 2002-07-08

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