JP2001293515A - Highly efficient and smooth descaling method - Google Patents
Highly efficient and smooth descaling methodInfo
- Publication number
- JP2001293515A JP2001293515A JP2000110238A JP2000110238A JP2001293515A JP 2001293515 A JP2001293515 A JP 2001293515A JP 2000110238 A JP2000110238 A JP 2000110238A JP 2000110238 A JP2000110238 A JP 2000110238A JP 2001293515 A JP2001293515 A JP 2001293515A
- Authority
- JP
- Japan
- Prior art keywords
- descaling
- pickling
- steel sheet
- smooth
- heat treatment
- 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]
【発明の属する技術分野】本発明は、Ｃｒを９〜１９％
含有するマルテンサイト系ステンレス鋼やフェライト系
ステンレス鋼のような、焼入れや焼戻しのために高温で
長時間の熱処理を施す鋼板を対象としており、これら熱
処理中に厚い酸化スケールを生じ、この厚い酸化スケー
ルによって難しくなるデスケーリング性を改善する技術
である。BACKGROUND OF THE INVENTION The present invention relates to a method for reducing Cr to 9 to 19%.
It is intended for steel sheets that are subjected to high-temperature, long-time heat treatment for quenching or tempering, such as martensitic stainless steel or ferritic stainless steel, which produces a thick oxide scale during these heat treatments. This is a technology that improves the descalability that becomes difficult due to the above.
【０００２】[0002]
【従来の技術】通常、ステンレス鋼板はスラブを熱間圧
延し、焼入れや焼戻し等の必要な熱処理を行い、全ての
熱間で行う処理を完了した後に、熱間での処理中に生成
した酸化スケールを除去して製品板とする。この酸化ス
ケールを除去する方法は、ショットブラスト等のメカニ
カルデスケーリングを行った後に硫酸溶液や硝弗酸溶液
を用いた酸洗を作用させて実施するか、メカニカルデス
ケーリングし酸洗処理した後研磨処理するか、メカニカ
ルデスケーリングした後に研磨処理するか、あるいは研
磨処理のみを行なって実施する。2. Description of the Related Art Normally, a stainless steel plate is subjected to necessary heat treatment such as quenching and tempering by subjecting a slab to hot rolling, and after completing all the hot treatments, the oxidation generated during the hot treatment. The scale is removed to obtain a product plate. This oxide scale can be removed by mechanical descaling such as shot blasting and then pickling with a sulfuric acid solution or nitric hydrofluoric acid solution, or by mechanical descaling and pickling and then polishing. The processing is performed, the polishing is performed after mechanical descaling, or only the polishing is performed.
【０００３】このデスケーリング能率を高めるための方
法として、例えば特公昭５８−５６０１３号公報では、
塩酸酸洗あるいは引き続き硝酸酸洗をすることで酸洗ス
ピードが上昇する方法が示されている。また特開昭６１
−４９７０６号公報では硝酸と弗酸の混合液、あるいは
硝酸と塩酸と第２鉄塩の混合液でスプレー酸洗したり浸
漬酸洗して、デスケール能率を向上する方法が述べられ
ている。As a method for improving the descaling efficiency, for example, Japanese Patent Publication No. 58-56013 discloses a method.
A method of increasing the pickling speed by performing hydrochloric acid pickling or subsequent nitric acid pickling is disclosed. In addition, JP-A-61
JP-A-49706 describes a method of improving the descaling efficiency by spray pickling or immersion pickling with a mixed solution of nitric acid and hydrofluoric acid or a mixed solution of nitric acid, hydrochloric acid and ferric salt.
【０００４】[0004]
【発明が解決しようとする課題】ところでＣｒを９〜１
９％含有するマルテンサイト系ステンレス鋼やフェライ
ト系ステンレス鋼などでは、焼入れや焼戻しのために高
温で長時間の熱処理を施す場合があるが、この場合の酸
化スケールの厚さは１００〜２００μｍ程度になる。こ
のような場合には、通常の数μｍ程度の厚さの酸化スケ
ールの場合に有効に作用した特公昭５８−５６０１３号
公報や特開昭６１−４９７０６号公報に示された方法を
適用しても、数時間におよぶ酸洗が必要になったり、研
磨処理する場合でも深く研削する必要があるため、能率
低下と板厚を精度良く製造するのが難しくなる問題があ
ることが判明した。Problems to be Solved by the Invention By the way, Cr is 9-1.
In the case of a martensitic stainless steel or a ferritic stainless steel containing 9%, heat treatment may be performed at a high temperature for a long time for quenching or tempering. In this case, the thickness of the oxide scale is about 100 to 200 μm. Become. In such a case, a method disclosed in Japanese Patent Publication No. 58-56013 or Japanese Patent Application Laid-Open No. 61-49706, which effectively worked for an oxide scale having a thickness of about several μm, is applied. However, it has been found that pickling for several hours is required, and it is necessary to deeply grind even in the case of polishing treatment, so that there is a problem that the efficiency is reduced and it is difficult to accurately manufacture the plate thickness.
【０００５】本発明は、このような厚い酸化スケールを
生じた場合に生じる数時間におよぶ酸洗や、研磨処理時
の能率低下と板厚精度不良を解消するための高能率で平
滑なデスケール方法を提供するものである。[0005] The present invention provides a highly efficient and smooth descaling method for eliminating pickling over several hours which occurs when such a thick oxide scale is produced, and a reduction in efficiency during polishing and poor thickness accuracy. Is provided.
【０００６】[0006]
【課題を解決するための手段】すなわち本発明は、 （１）熱間圧延後に１回あるいは複数回の熱処理を行っ
た鋼板に、１回若しくは２回以上のメカニカルデスケー
リング処理を施し、引き続き酸洗処理、研磨処理のいず
れか若しくは両方を行う鋼板のデスケール方法におい
て、前記メカニカルデスケーリング処理のうち１つ以上
がサンドブラスト処理であることを特徴とする高能率で
平滑なデスケール方法。 （２）メカニカルデスケーリング処理が、サンドブラス
ト処理の後にショットブラスト処理を行うものであるこ
とを特徴とする前項（１）記載の高能率で平滑なデスケ
ール方法。 （３）鋼板がＣｒを９〜１９質量％含有することを特徴
とする前項（１）若しくは（２）に記載の高能率で平滑
なデスケール方法、である。The present invention provides: (1) a steel sheet which has been subjected to one or more heat treatments after hot rolling is subjected to one or two or more mechanical descaling treatments and then to an acid treatment; A highly efficient and smooth descaling method, wherein at least one of the mechanical descaling processes is a sandblasting process, wherein the descaling process is performed on one or both of a washing process and a polishing process. (2) The high-efficiency and smooth descaling method according to the above (1), wherein the mechanical descaling processing is performed by performing shot blast processing after sand blast processing. (3) The highly efficient and smooth descaling method according to the above (1) or (2), wherein the steel sheet contains 9 to 19% by mass of Cr.
【０００７】[0007]
【発明の実施の形態】種々の詳細な検討を行った結果、
厚い酸化スケールを生じた場合のデスケール能率を向上
させる方法として、最終熱処理後にサンドブラスト処理
とショットブラスト処理を組み合わせて作用させるメカ
ニカルデスケーリングを行うことが最も有効であること
を見出した。以下、実験結果に従い説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS As a result of various detailed studies,
As a method of improving the descaling efficiency when a thick oxide scale is generated, it has been found that mechanical descaling in which sand blast treatment and shot blast treatment are combined after the final heat treatment is most effective. Hereinafter, a description will be given according to experimental results.
【０００８】Ｃｒ：１２％、Ｎｉ：４％、Ｍｏ：０．４
％、Ｃ：０．０３％、Ｓｉ：０．３％、Ｍｎ：０．９％
を含有するマルテンサイト系ステンレス鋼の熱間圧延後
の鋼板について、１段加熱の条件として５６０℃で５Ｈ
ｒ保定後空冷処理、２段加熱の条件として１０５０℃で
１Ｈｒ保定後空冷処理、３段加熱の条件として６２０℃
で１Ｈｒ保定後空冷処理を行う、計３回からなる熱処理
を行なった。[0008] Cr: 12%, Ni: 4%, Mo: 0.4
%, C: 0.03%, Si: 0.3%, Mn: 0.9%
Of hot-rolled martensitic stainless steel containing 560 ° C. at 560 ° C. for 5 hours
Air cooling treatment after r holding, air cooling treatment at 1050 ° C. for two-stage heating at 150 ° C. 620 ° C. as air cooling treatment for three-stage heating
, And a heat treatment consisting of a total of three heat treatments was performed.
【０００９】上記熱処理後の鋼板を用いた比較実験内容
は、図１に示すように、メカニカルデスケーリング法や
その組み合わせを変更して処理したものについて、デス
ケールが終了する酸洗時間の違いを求めた。酸洗条件
は、硝酸濃度１５０ｇ／Ｌ、弗酸濃度５０ｇ／Ｌを含有
する５５℃の溶液を用いた。メカニカルデスケーリング
の種類は、サンドブラスト法（砂を加圧した空気ととも
に吹き付ける。）、ショットブラスト（インペラーで直
径４００μｍ程度のショットブラスト粒を投射す
る。）、砂鉄を高圧水とともに吹き付ける方法、砥粒入
りブラシロールで研削する方法を比較した。As shown in FIG. 1, the content of the comparative experiment using the steel sheet after the heat treatment was as follows. The difference in the pickling time at which the descaling was completed was determined for those treated by changing the mechanical descaling method or a combination thereof. Was. As the pickling conditions, a 55 ° C. solution containing a nitric acid concentration of 150 g / L and a hydrofluoric acid concentration of 50 g / L was used. Types of mechanical descaling include sand blasting (blasting sand with pressurized air), shot blasting (projecting shot blasting particles with a diameter of about 400 μm with an impeller), blowing iron sand with high-pressure water, and containing abrasive grains The method of grinding with a brush roll was compared.
【００１０】図１から明らかなように、これらメカニカ
ルデスケーリング法の内、サンドブラスト法は酸洗時間
を著しく短時間化する作用があり、さらにサンドブラス
ト処理後にショットブラスト処理を行うと一層効果が大
きいことが判明した。As apparent from FIG. 1, of these mechanical descaling methods, the sand blast method has an effect of significantly shortening the pickling time, and the effect is more significant if the shot blast processing is performed after the sand blast processing. There was found.
【００１１】このように、サンドブラスト処理、さらに
はサンドブラスト処理後にショットブラスト処理をする
ことで、酸洗する時のデスケール終了に要する時間が短
縮できる理由は、複数回の熱処理をして再加熱が繰り返
されると、１００〜２００μm 程度の厚い酸化スケール
を生じるようになる。しかも、酸化スケールとメタルの
界面に、Ｃｒ2 Ｏ3 を多く含むスピネル構造の酸化スケ
ールが生じるため、表層からはポーラスなスケール層、
緻密で硬い層、メタルの順になっており、通常用いられ
るショットブラスト、砂鉄を高圧水とともに吹き付ける
方法、砥粒入りブラシロールで研削する方法ではポーラ
スな厚いスケールに有効に作用させることができない。
サンドブラストは砂粒の角張った形状から研削作用が大
きく、ポーラスなスケールを簡単に除去できる。さらに
ショットブラストを作用させると有効な理由は、ポーラ
スなスケールが除去された表面には緻密で硬いスケール
のみが存在し、このスケールには特にショットブラスト
が有効に作用できるためである。[0011] As described above, the time required for the end of the descaling by pickling is reduced by performing the sand blasting and the shot blasting after the sand blasting, because the heat treatment is performed a plurality of times and the reheating is repeated. This results in a thick oxide scale of about 100 to 200 μm. In addition, since an oxide scale having a spinel structure containing a large amount of Cr 2 O 3 is generated at the interface between the oxide scale and the metal, a porous scale layer is formed from the surface layer.
A dense and hard layer is formed in the order of metal, and a shot blasting method, a method of spraying iron sand with high-pressure water, and a method of grinding with a brush roll containing abrasive grains cannot be effectively applied to a porous thick scale.
Sandblasting has a large grinding action due to the angular shape of the sand grains, and can easily remove porous scales. The reason why the shot blasting is effective is that only the dense and hard scale is present on the surface from which the porous scale has been removed, and the shot blasting can particularly effectively act on this scale.
【００１２】次に本発明の限定理由について説明する。
熱処理の条件については特に限定しない。焼鈍する鋼板
の組成と熱処理の目的によって２００〜１３００℃のさ
まざまな焼鈍方法が知られている。このうち４００℃以
上の焼鈍を行うと、酸化スケールとメタルの界面にＣｒ
2 Ｏ3 を多く含むスピネル構造の酸化スケールが生じ始
めるため、４００℃以上の場合に本方法を適用すると有
効である。さらに、７５０℃以上では生成量が多くなる
ため特に有効である。Next, the reasons for limitation of the present invention will be described.
The conditions of the heat treatment are not particularly limited. Various annealing methods at 200 to 1300 ° C. are known depending on the composition of the steel sheet to be annealed and the purpose of the heat treatment. When annealing at 400 ° C. or more is performed, the interface between the oxide scale and the metal becomes Cr
Since an oxide scale having a spinel structure containing a large amount of 2 O 3 starts to be generated, it is effective to apply the present method at 400 ° C. or higher. Further, when the temperature is 750 ° C. or more, the amount of production is large, which is particularly effective.
【００１３】最終熱処理後のデスケール方法としては、
メカニカルデスケーリングした後に酸洗処理するか、酸
洗処理し研磨処理するか、あるいは研磨処理を行なう
が、本発明の特徴はメカニカルデスケーリング処理のう
ち１つ以上をサンドブラスト処理とすることにある。デ
スケーリングをより強化するために複数回処理したり、
別の方法を組み合せても構わないが、サンドブラスト処
理し、ショットブラスト処理を行う場合が特にデスケー
リング能率が高い。As a descaling method after the final heat treatment,
After mechanical descaling, pickling, pickling and polishing, or polishing is performed. The feature of the present invention resides in that one or more of mechanical descaling is sandblasting. Process multiple times to enhance descaling,
Although other methods may be combined, the descaling efficiency is particularly high when sand blasting and shot blasting are performed.
【００１４】メカニカルデスケーリング処理後の酸洗処
理は、硝弗酸溶液や硫酸溶液に浸漬する方法など公知の
方法で行ない、また研磨処理もグラインダーなど公知の
方法を用いる。The pickling treatment after the mechanical descaling treatment is performed by a known method such as a method of dipping in a nitric hydrofluoric acid solution or a sulfuric acid solution, and the polishing treatment is also performed by a known method such as a grinder.
【００１５】[0015]
【実施例】表１に示す化学成分からなるマルテンサイト
系ステンレス鋼やフェライト系ステンレス鋼について、
表２に示す熱処理条件で熱処理を行い、最終熱処理後に
表３に示すメカニカルデスケーリングを行った後、酸洗
を行った。デスケールが完了するまでの酸洗時間を併せ
て表３に示す。メカニカルデスケーリングをサンドブラ
スト処理としたもの、もしくはサンドブラスト処理後に
ショットブラスト処理を組み合わせたものでは、短時間
の酸洗が可能になった。一方、これらのメカニカルデス
ケーリングを適用しない場合には長時間の酸洗が必要で
あった。尚、表３においてＳＡ：サンドブラスト、Ｓ
Ｂ：ショットブラスト、砂鉄：砂鉄を高圧水と共に吹き
付ける方法、砥粒：砥粒入りブラシロールを示す。EXAMPLES Martensitic stainless steel and ferritic stainless steel having the chemical components shown in Table 1 were used.
Heat treatment was performed under the heat treatment conditions shown in Table 2, and after the final heat treatment, mechanical descaling shown in Table 3 was performed, followed by pickling. Table 3 also shows the pickling time until the completion of the descaling. In the case where the mechanical descaling is performed by sand blasting or the case where shot blasting is combined after sand blasting, it is possible to perform pickling in a short time. On the other hand, when these mechanical descaling is not applied, long-time pickling was required. In Table 3, SA: sandblast, S
B: Shot blast, sand iron: a method of blowing sand iron together with high-pressure water, abrasive grains: brush rolls containing abrasive grains.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【発明の効果】本発明によって、従来技術では達成でき
なかった、焼入れや焼戻しのために高温で長時間の熱処
理を施した鋼板の最終熱処理後の酸洗時間が、大幅に短
縮できるようになり、その工業的意義は極めて大きい。According to the present invention, the pickling time after the final heat treatment of a steel sheet which has been subjected to a high-temperature and long-time heat treatment for quenching and tempering, which cannot be achieved by the prior art, can be greatly reduced. However, its industrial significance is extremely large.
【図１】熱間圧延後の鋼板に３回の熱処理を行なった場
合に、最終熱処理後に種々のメカニカルデスケーリング
法を適用し酸洗処理した時の、デスケール終了時間への
影響を示す図。FIG. 1 is a graph showing the effect on the descale end time when pickling is performed by applying various mechanical descaling methods after a final heat treatment when a steel sheet after hot rolling is heat-treated three times.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２３Ｇ 1/08 Ｃ２３Ｇ 1/08 (72)発明者 橋本 剛志 北九州市戸畑区飛幡町１−１ 新日本製鐵 株式会社八幡製鐵所内 (72)発明者 山本 義晃 北九州市戸畑区飛幡町１−１ 新日本製鐵 株式会社八幡製鐵所内 Ｆターム(参考） 4K053 PA05 PA12 QA01 RA15 RA16 RA17 SA06 SA13 SA15 TA04 ZA10 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C23G 1/08 C23G 1/08 (72) Inventor Takeshi Hashimoto 1-1, Tobata-cho, Tobata-ku, Kitakyushu-shi Made in New Japan (72) Inventor Yoshiaki Yamamoto 1-1 Hiba-cho, Tobata-ku, Kitakyushu Nippon Steel Corporation Yawata Works F-term (reference) 4K053 PA05 PA12 PA12 QA01 RA15 RA16 RA17 SA06 SA13 SA15 TA04 ZA10
Claims (3)
理を行った鋼板に、１回若しくは２回以上のメカニカル
デスケーリング処理を施し、引き続き酸洗処理、研磨処
理のいずれか若しくは両方を行う鋼板のデスケール方法
において、前記メカニカルデスケーリング処理のうち１
つ以上がサンドブラスト処理であることを特徴とする高
能率で平滑なデスケール方法。1. A steel sheet which has been subjected to one or more heat treatments after hot rolling is subjected to one or more mechanical descaling treatments, followed by pickling treatment and / or polishing treatment. In the method for descaling a steel sheet, one of the mechanical descaling processes may be performed.
A highly efficient and smooth descaling method characterized in that at least one is sandblasting.
ドブラスト処理の後にショットブラスト処理を行うもの
であることを特徴とする請求項１記載の高能率で平滑な
デスケール方法。2. The high-efficiency and smooth descaling method according to claim 1, wherein the mechanical descaling processing is performed by performing shot blast processing after sand blast processing.
とを特徴とする請求項１若しくは２記載の高能率で平滑
なデスケール方法。3. The highly efficient and smooth descaling method according to claim 1, wherein the steel sheet contains 9 to 19% by mass of Cr.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000110238A JP2001293515A (en) | 2000-04-12 | 2000-04-12 | Highly efficient and smooth descaling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001293515A true JP2001293515A (en) | 2001-10-23 |
Family
ID=18622780
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| JP2021021084A (en) * | 2019-07-24 | 2021-02-18 | 日本製鉄株式会社 | Manufacturing method of martensitic stainless steel tube |
| CN114130842A (en) * | 2021-11-29 | 2022-03-04 | 东北大学 | Method for removing oxide skin of high Cr-Si alloyed 1000-plus 1800 MPa-level hot forming steel |
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