JPH0751729A - Descaling and pickling method for hot rolled stainless steel sheet and its line - Google Patents
Descaling and pickling method for hot rolled stainless steel sheet and its lineInfo
- Publication number
- JPH0751729A JPH0751729A JP20753193A JP20753193A JPH0751729A JP H0751729 A JPH0751729 A JP H0751729A JP 20753193 A JP20753193 A JP 20753193A JP 20753193 A JP20753193 A JP 20753193A JP H0751729 A JPH0751729 A JP H0751729A
- Authority
- JP
- Japan
- Prior art keywords
- grinding
- brush roll
- descaling
- hot
- 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
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はステンレス熱延鋼板の製
造方法に係わり、特に脱スケール・酸洗法及びそのライ
ンに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hot rolled stainless steel sheet, and more particularly to a descaling / pickling method and its line.
【０００２】[0002]
【従来の技術】ステンレス熱延鋼帯の脱スケール・酸洗
においては、一般的にメカニカルスケールブレーカー
（ＭＳＢと称する）、ショットブラスト、硫酸槽、混酸
槽、（硝酸＋弗酸）で配置される脱スケール・酸洗設備
が用いられている。また、必要に応じて混酸槽の後に硝
酸槽を設置する場合もある。2. Description of the Related Art In descaling and pickling of hot rolled stainless steel strips, mechanical scale breakers (referred to as MSB), shot blasts, sulfuric acid tanks, mixed acid tanks, and (nitric acid + hydrofluoric acid) are generally used. Descaling / pickling equipment is used. A nitric acid tank may be installed after the mixed acid tank, if necessary.
【０００３】また特開昭53−108830号公報では、ＭＳＢ
によりスケールを割り、予備酸洗の後、ショットブラス
トを使用し、さらに回転ブラシにて研削した後、酸洗を
施すという方法が示されている。In Japanese Patent Laid-Open No. 53-108830, the MSB
According to the method, a scale is divided by, a pre-pickling is performed, shot blasting is used, grinding is performed with a rotating brush, and then pickling is performed.
【０００４】[0004]
【発明が解決しようとする課題】ここで注意すべきこと
は、従来の方法では、いずれの方法でも鋼帯の酸洗のた
めに硝酸＋弗酸の混合酸（以下混酸と称する）を使用し
ていることである。混酸は、弗酸の還元作用により酸化
物であるスケールの除去を行い、また硝酸によりステン
レス鋼帯表面を不働態化して、ステンレス特有の耐食性
を発生させている。また、混酸はそれぞれの混合比率や
温度を変化させることによりその作用の強度を変えるこ
とができ、鋼帯の成分等による溶解量の差異等にも比較
的容易に対応することができるという特長がある。It should be noted here that in any of the conventional methods, a mixed acid of nitric acid and hydrofluoric acid (hereinafter referred to as mixed acid) is used for pickling steel strip. It is that. The mixed acid removes scale, which is an oxide, by the reducing action of hydrofluoric acid, and passivates the surface of the stainless steel strip with nitric acid to generate corrosion resistance peculiar to stainless steel. In addition, mixed acid can change the strength of its action by changing the mixing ratio and temperature of each, and it is relatively easy to deal with differences in the amount of dissolution due to the components of the steel strip, etc. is there.
【０００５】しかし、混酸には鋼帯が完全固溶化熱処理
状態でない場合や鋼帯表面に極端に応力集中が起こって
いる場合には結晶粒界を選択的に侵食するという欠点が
ある。この粒界侵食は、冷間圧延後もミクロな凹疵とな
って残留し光沢や研磨性を阻外する要因となっていた。However, mixed acid has a drawback that it selectively erodes grain boundaries when the steel strip is not in a state of complete solution heat treatment or when stress is extremely concentrated on the surface of the steel strip. This intergranular erosion remained as microscopic flaws even after cold rolling, and became a factor that impedes gloss and polishability.
【０００６】このため、特に光沢を要求される光輝焼鈍
材や研磨性を要求される製品を製造する場合には、鋼帯
表面をグラインダーにより研磨し粒界侵食溝を除去した
後に冷間圧延を行っている。また、この粒界侵食溝を除
去するため、混酸の濃度や温度を上昇し酸に溶解させて
いる。このような方法を取ると混酸に溶解した金属分が
許容溶解量をオーバーすると、酸洗槽やタンクの中にス
ラッジとして沈殿するため、定期的にこのスラッジを清
掃する必要がある。Therefore, in the case of producing a bright annealed material which is particularly required to have a luster or a product which is required to be abraded, cold rolling is carried out after polishing the surface of the steel strip with a grinder to remove the grain boundary erosion grooves. Is going. Further, in order to remove the grain boundary erosion groove, the concentration and temperature of the mixed acid are raised and dissolved in the acid. If such a method is adopted, if the metal content dissolved in the mixed acid exceeds the allowable dissolution amount, it will be precipitated as sludge in the pickling tank or tank, so it is necessary to clean this sludge regularly.
【０００７】本発明は粒界侵食に係わる前記問題点を解
決したステンレス熱延鋼帯の脱スケール・酸洗法及びそ
のラインを提供することを目的とするものである。An object of the present invention is to provide a descaling / pickling method for a stainless hot-rolled steel strip and a line therefor, which solves the above-mentioned problems associated with grain boundary erosion.
【０００８】[0008]
【課題を解決するための手段】本発明は、熱間圧延さ
れ、焼鈍されたステンレス熱延鋼板を脱スケールするに
際して、まずメカニカルスケールブレーカーにより処理
し、次いでショットブラスト処理し、次いで硫酸酸洗処
理し、次いで研削ブラシロールにて研削処理し、最後に
硝酸電解処理することを特徴とするステンレス熱延鋼板
の脱スケール・酸洗法であり、また本発明は熱間圧延さ
れ、焼鈍されたステンレス熱延鋼板を脱スケールするラ
インにおいて、メカニカルスケールブレーカー、ショッ
トブラスト装置、硫酸槽、研削ブラシロール装置、硝酸
電解槽の順に配置したことを特徴とするステンレス熱延
鋼板の脱スケール・酸洗ラインである。そして上記ライ
ンにおいて、研削ブラシロール装置として重研削ブラシ
ロール装置を用いることが望ましい。[MEANS FOR SOLVING THE PROBLEMS] In the present invention, when descaling a hot rolled and annealed stainless hot rolled steel sheet, it is first treated by a mechanical scale breaker, then shot blasting treatment, and then sulfuric acid pickling treatment. Then, a descaling and pickling method of the hot rolled stainless steel sheet is characterized by performing a grinding treatment with a grinding brush roll, and finally performing a nitric acid electrolytic treatment. Further, the present invention is a hot rolled and annealed stainless steel. A descaling / pickling line for stainless hot-rolled steel sheets, characterized in that a mechanical scale breaker, a shot blasting device, a sulfuric acid bath, a grinding brush roll device, and a nitric acid electrolysis bath were placed in that order in the line for descaling hot-rolled steel sheets. is there. In the above line, it is desirable to use a heavy grinding brush roll device as a grinding brush roll device.
【０００９】ここで重研削ブラシロールとは、特開平４
−315582号公報にも開示されているように砥粒を含有す
る直径が３mm以上の棒状体をロール軸に放射状に装着し
たものであり、研削砥石、研摩ディスクの研摩性能にほ
ぼ匹敵する研摩性能を有するものである。さらに詳しく
は、砥粒を含有する直径が３mm以上の棒状体をロール軸
に、ばね材を介して、軸円周に対しては放射状、軸方向
には集合した状態ならしめて装着したブラシロールにお
いて、該棒状体及びこれを結合したばね材による研削要
素体を螺旋状の配置とし、ロール軸長さ方向の面と研削
要素体の螺旋並びの面との角度が３度以上であり、研削
要素体の隣り合う方向への動きを規制する膨大部を各々
の研削要素体に設けた研削ブラシロールである。The term "heavy grinding brush roll" as used herein refers to Japanese Patent Laid-Open No.
As disclosed in JP-A-315582, a rod-shaped body containing abrasive grains having a diameter of 3 mm or more is radially mounted on a roll shaft, and has a polishing performance almost equal to that of a grinding wheel or a polishing disk. Is to have. More specifically, in a brush roll mounted with a rod-shaped body containing abrasive grains having a diameter of 3 mm or more on a roll shaft, radially with respect to the shaft circumference through a spring material, and assembled in the axial direction. The rod-shaped body and the grinding element body made of a spring material that is coupled to the bar-shaped body are arranged in a spiral shape, and the angle between the surface in the roll axis length direction and the spirally arranged surface of the grinding element body is 3 degrees or more. It is a grinding brush roll in which each grinding element body is provided with an enormous part that restricts the movement of the body in the adjacent direction.
【００１０】[0010]
【作用】本発明によれば、ステンレス熱延鋼帯の脱スケ
ールにおいて一般的に使用されていた混酸を使用せずに
研削ブラシロールを前記の順序で使用することにより、
粒界侵食を防止することができるため、光沢の阻害要因
がなくなり、冷間圧延後の光沢度が向上する。その結
果、光輝焼純材をつくる場合でも表面のグラインダー工
程を省略することができ、省力、省工程化が実現でき
る。また、使用目的により研磨を要するものに対して
は、表面粗度が既に低下していることにより、研磨性が
向上し、研磨工数の削減が図られる。According to the present invention, by using the grinding brush rolls in the above order without using the mixed acid generally used in the descaling of the hot strip of stainless steel,
Since grain boundary erosion can be prevented, there are no factors that hinder gloss, and the gloss after cold rolling improves. As a result, the surface grinder process can be omitted even when producing a bright baked pure material, and labor saving and process saving can be realized. Further, for those which require polishing depending on the purpose of use, the surface roughness has already been lowered, so that the polishing property is improved and the number of polishing steps can be reduced.
【００１１】また重研削ブラシロールを用いた研削によ
り発生するスラッジは、比較的粒子が大きく、金属粉と
なっているため、容易に沈降分離できる。あるいは電磁
分離も可能である。ところが従来のように酸洗（混酸処
理）した場合、酸液中に溶解している金属イオン（F
en+、Crn+、Nin+）の分離は非常に困難であり、またコ
ストも高い。The sludge generated by grinding using the heavy grinding brush roll has relatively large particles and is a metal powder, so that it can be easily settled and separated. Alternatively, electromagnetic separation is possible. However, when pickling (mixed acid treatment) is performed as in the past, metal ions (F
Separation of e n + , Cr n + , Ni n + ) is very difficult and costly.
【００１２】一方、この金属イオンが許容溶解量以上と
なるとスラッジ（主成分FeF3・３H2O ）となり、酸洗槽
や循環タンクに沈殿し、定期的な除去作業を行う必要が
ある。このスラッジは粒子が非常に小さい（５〜 200μ
ｍ）ため、分離が困難であると同時に混酸と同時に取り
扱うため危険を共なう作業となる。ところが、本発明に
より上記の問題点が全て解決できる。On the other hand, when the amount of this metal ion exceeds the allowable amount of dissolution, it becomes sludge (main component FeF 3 .3H 2 O), which is precipitated in the pickling tank or circulation tank, and it is necessary to perform periodical removal work. This sludge has very small particles (5-200μ
Therefore, it is difficult to separate, and at the same time, it is a dangerous work since it is handled at the same time as the mixed acid. However, the present invention can solve all the above problems.
【００１３】[0013]
【実施例】図１に本発明の脱スケール・酸洗ラインの１
実施例の断面模式図を示す。図２は従来の脱スケール・
酸洗ラインの代表的な例の断面模式図である。図１に示
す本発明ラインと図２に示す従来のラインによって脱ス
ケールしたオーステナイト系ステンレス熱延鋼帯表面の
金属組織写真、さらにそれを冷間圧延、焼鈍酸洗を施し
た後の鋼帯表面の金属組織写真を図３に比較して示す。EXAMPLE FIG. 1 shows a descaling / pickling line 1 according to the present invention.
The cross-sectional schematic diagram of an Example is shown. Figure 2 shows conventional descaling.
It is a cross-sectional schematic diagram of the typical example of a pickling line. A metallographic photograph of the surface of an austenitic stainless hot-rolled steel strip descaled by the line of the present invention shown in FIG. 1 and the conventional line shown in FIG. 2, and further the steel strip surface after cold rolling and annealing pickling 3 shows a photograph of the metal structure in comparison with FIG.
【００１４】本発明法では混酸による脱スケールを省略
したため、従来見られたような粒界侵食は見られず、重
研削ブラシロールによる研削目が見られるだけである。
さらにこれを冷間圧延した場合には従来法に見られた凹
状の疵は見られないことがわかる。図４は本発明法と従
来法による冷間圧延後の板面の光沢度、図５は粗度を比
較したものである。In the method of the present invention, since descaling by mixed acid is omitted, the grain boundary erosion which is conventionally seen is not seen, but only the grinds by the heavy grinding brush roll are seen.
Furthermore, it can be seen that when this is cold rolled, the concave flaws found in the conventional method are not seen. FIG. 4 is a comparison of the glossiness of the plate surface after cold rolling according to the method of the present invention and the conventional method, and FIG. 5 is a comparison of the roughness.
【００１５】図３の表面金属組織写真の結果を裏づける
ように、本発明法によって得られた鋼帯を冷間圧延した
場合には、その光沢度は、（ここでは光沢度はJIS Z874
1で規定された鏡面光沢度測定方法による）平均値で 70
0→ 800へと向上しており、また粗度（Ｒｚ）が平均 1.
9μｍから 0.6μｍとなっているため、平均研磨回数は
4.1→ 2.0へと半減した。As the results of the surface metallographic photograph of FIG. 3 are supported, when the steel strip obtained by the method of the present invention is cold-rolled, its glossiness is (here, the glossiness is JIS Z874).
70 by the average value (according to the specular gloss measurement method specified in 1)
It has improved from 0 to 800, and the average roughness (Rz) is 1.
Since it is from 9 μm to 0.6 μm, the average number of polishing is
Halved from 4.1 to 2.0.
【００１６】[0016]
【発明の効果】本発明は、ステンレス熱延鋼帯の脱スケ
ールにおいて、従来の混酸を用いる代わりに研削ブラシ
ロールにより研削し、その後硝酸により不働態化を行う
ようにしたため、混酸による粒界侵食を防止することが
でき、これにより冷間圧延後の光沢度の向上、冷間圧延
前のグラインダー工程の省略を達成した。また混酸槽内
の人力によるスラッジ処理がなくなり、また研削ブラシ
ロールによる研削かすの除去処理は容易に自動化処理で
きるので危険作業の廃止と作業費の削減を図ることがで
きた。EFFECTS OF THE INVENTION According to the present invention, in descaling of a hot rolled stainless steel strip, instead of using a conventional mixed acid, grinding is performed with a grinding brush roll, and passivation is then performed with nitric acid. This has made it possible to improve the glossiness after cold rolling and to omit the grinder step before cold rolling. In addition, since sludge treatment by human power in the mixed acid tank is eliminated and grinding dust removal processing by a grinding brush roll can be easily automated, dangerous work can be eliminated and labor costs can be reduced.
【図１】本発明の設備配置図の１例を示す断面模式図。FIG. 1 is a schematic sectional view showing an example of a facility layout of the present invention.
【図２】従来の設備配置図の１例を示す断面模式図。FIG. 2 is a schematic sectional view showing an example of a conventional equipment layout diagram.
【図３】従来法及び本発明法で処理した熱延鋼帯ならび
に冷延鋼帯の表面金属組織写真。FIG. 3 is a photograph of surface metallographic structures of a hot-rolled steel strip and a cold-rolled steel strip treated by the conventional method and the method of the present invention.
【図４】本発明法と従来法による冷間圧延後の光沢度を
示すグラフ。FIG. 4 is a graph showing the glossiness after cold rolling according to the method of the present invention and the conventional method.
【図５】本発明法と従来法による冷間圧延後の板面粗度
を示すグラフ。FIG. 5 is a graph showing plate surface roughness after cold rolling according to the method of the present invention and the conventional method.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 準一 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 横沢 二男 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 伊藤 正彦 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 都築 聡 千葉県千葉市中央区川崎町１番地 川崎製 鉄株式会社千葉製鉄所内 (72)発明者 穂谷 節男 和歌山県海草郡野上町動木1452 株式会社 ホタニ内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Yamamoto 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Inventor Nio Yokozawa 1 Kawasaki-cho, Chuo-ku, Chiba-shi Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Inventor Masahiko Ito 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Satoshi Tsuzuki, 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Co., Ltd. Chiba Works (72) Inventor Setsuo Hotani 1452 Foki, Nogami Town, Seagrass County, Wakayama Prefecture Hotani Co., Ltd.
Claims (3)
延鋼板を脱スケールするに際して、まずメカニカルスケ
ールブレーカーにより処理し、次いでショットブラスト
処理し、次いで硫酸酸洗処理し、次いで研削ブラシロー
ルにて研削処理し、最後に硝酸電解処理することを特徴
とするステンレス熱延鋼板の脱スケール・酸洗法。1. When descaling a hot-rolled and annealed hot-rolled stainless steel sheet, it is first treated with a mechanical scale breaker, followed by shot blasting, then sulfuric acid pickling, and then with a grinding brush roll. A descaling / pickling method for hot-rolled stainless steel plates, characterized by grinding and finally electrolytic treatment with nitric acid.
延鋼板を脱スケールするラインにおいて、メカニカルス
ケールブレーカー、ショットブラスト装置、硫酸槽、研
削ブラシロール装置、硝酸電解槽の順に配置したことを
特徴とするステンレス熱延鋼板の脱スケール・酸洗ライ
ン。2. A mechanical scale breaker, a shot blasting device, a sulfuric acid bath, a grinding brush roll device, and a nitric acid electrolysis bath are arranged in this order in a line for descaling a hot-rolled and annealed stainless hot-rolled steel sheet. A descaling and pickling line for stainless hot rolled steel sheets.
ール装置であることを特徴とする請求項２記載のステン
レス熱延鋼板の脱スケール・酸洗ライン。3. The descaling / pickling line for hot-rolled stainless steel sheet according to claim 2, wherein the grinding brush roll device is a heavy grinding brush roll device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20753193A JPH0751729A (en) | 1993-08-23 | 1993-08-23 | Descaling and pickling method for hot rolled stainless steel sheet and its line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20753193A JPH0751729A (en) | 1993-08-23 | 1993-08-23 | Descaling and pickling method for hot rolled stainless steel sheet and its line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0751729A true JPH0751729A (en) | 1995-02-28 |
Family
ID=16541271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20753193A Pending JPH0751729A (en) | 1993-08-23 | 1993-08-23 | Descaling and pickling method for hot rolled stainless steel sheet and its line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0751729A (en) |
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|---|---|---|---|---|
| EP0698506A1 (en) | 1994-08-11 | 1996-02-28 | Sumitomo Rubber Industries Ltd. | Printing offset blanket |
| US6088895A (en) * | 1999-01-21 | 2000-07-18 | Armco Inc. | Method for descaling hot rolled strip |
| KR100550286B1 (en) * | 2001-12-21 | 2006-02-08 | 재단법인 포항산업과학연구원 | The Method for Preventing Rinsing Rust on Hot Coil Using Cathodic Protection |
| JP2010042480A (en) * | 2008-08-14 | 2010-02-25 | Daido Steel Co Ltd | Rolled bar surface polishing method |
| KR100985370B1 (en) * | 2008-07-04 | 2010-10-04 | 주식회사 포스코 | Continuous Hot-dip Coating Line of Hot Rolled Steel Strip and Method for Continuous Hot-dip Coating Hot Rolled Steel Strip |
| KR100985349B1 (en) * | 2008-07-04 | 2010-10-04 | 주식회사 포스코 | Continuous Hot-dip Coating Line and Method for Continuous Hot-dip Coating Steel Strip |
| US7876033B2 (en) | 2008-10-23 | 2011-01-25 | Hamamatsu Photonics K.K. | Electron tube |
| US8040060B2 (en) | 2008-10-23 | 2011-10-18 | Hamamatsu Photonics K.K. | Electron tube |
| US8080806B2 (en) | 2008-10-23 | 2011-12-20 | Hamamatsu Photonics K.K. | Electron tube |
| US8203266B2 (en) | 2008-10-23 | 2012-06-19 | Hamamatsu Photonics K.K. | Electron tube |
| KR101322138B1 (en) * | 2009-12-16 | 2013-10-28 | 주식회사 포스코 | Facility for Manufacturing Steel Strip and Method for Manufacturing Steel Strip Using the Facility |
| JP2017170489A (en) * | 2016-03-24 | 2017-09-28 | 日新製鋼株式会社 | Method for manufacturing ferritic stainless steel sheet |
-
1993
- 1993-08-23 JP JP20753193A patent/JPH0751729A/en active Pending
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| EP0698506A1 (en) | 1994-08-11 | 1996-02-28 | Sumitomo Rubber Industries Ltd. | Printing offset blanket |
| US6088895A (en) * | 1999-01-21 | 2000-07-18 | Armco Inc. | Method for descaling hot rolled strip |
| KR100550286B1 (en) * | 2001-12-21 | 2006-02-08 | 재단법인 포항산업과학연구원 | The Method for Preventing Rinsing Rust on Hot Coil Using Cathodic Protection |
| KR100985370B1 (en) * | 2008-07-04 | 2010-10-04 | 주식회사 포스코 | Continuous Hot-dip Coating Line of Hot Rolled Steel Strip and Method for Continuous Hot-dip Coating Hot Rolled Steel Strip |
| KR100985349B1 (en) * | 2008-07-04 | 2010-10-04 | 주식회사 포스코 | Continuous Hot-dip Coating Line and Method for Continuous Hot-dip Coating Steel Strip |
| JP2010042480A (en) * | 2008-08-14 | 2010-02-25 | Daido Steel Co Ltd | Rolled bar surface polishing method |
| US7876033B2 (en) | 2008-10-23 | 2011-01-25 | Hamamatsu Photonics K.K. | Electron tube |
| US8040060B2 (en) | 2008-10-23 | 2011-10-18 | Hamamatsu Photonics K.K. | Electron tube |
| US8080806B2 (en) | 2008-10-23 | 2011-12-20 | Hamamatsu Photonics K.K. | Electron tube |
| US8203266B2 (en) | 2008-10-23 | 2012-06-19 | Hamamatsu Photonics K.K. | Electron tube |
| KR101322138B1 (en) * | 2009-12-16 | 2013-10-28 | 주식회사 포스코 | Facility for Manufacturing Steel Strip and Method for Manufacturing Steel Strip Using the Facility |
| JP2017170489A (en) * | 2016-03-24 | 2017-09-28 | 日新製鋼株式会社 | Method for manufacturing ferritic stainless steel sheet |
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