JPH07216568A - Device and method for producing cr-containing corrosion resistant steel strip - Google Patents
Device and method for producing cr-containing corrosion resistant steel stripInfo
- Publication number
- JPH07216568A JPH07216568A JP941994A JP941994A JPH07216568A JP H07216568 A JPH07216568 A JP H07216568A JP 941994 A JP941994 A JP 941994A JP 941994 A JP941994 A JP 941994A JP H07216568 A JPH07216568 A JP H07216568A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- resistant steel
- pickling
- producing
- annealing
- 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.)
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Links
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- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- 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、Ｃｒを合金成分として
含有するＣｒ含有耐食性鋼帯の製造方法及び製造装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a Cr-containing corrosion resistant steel strip containing Cr as an alloy component.
【０００２】[0002]
【従来の技術】冷間圧延後のＣｒ含有鋼帯は従来から、
連続焼鈍・酸洗設備によって連続的な焼鈍酸洗処理が施
されている。冷間圧延後のＣｒ含有鋼帯１０は、図３に
示されるように、予熱帯１２、加熱帯１４、冷却帯１６
を順次通過し、その後、水冷帯１８で水冷され、酸洗槽
２０で脱スケール処理と不動態化処理が施され、リンス
槽２２、ドライヤ２４を通過して製造される。尚、酸洗
槽２０の中の酸洗液は、酸洗液冷却装置２６で冷却され
る。2. Description of the Prior Art Cr-containing steel strips after cold rolling have been
Continuous annealing and pickling equipment is used for continuous annealing and pickling. As shown in FIG. 3, the Cr-containing steel strip 10 after cold rolling has a pre-tropical zone 12, a heating zone 14, and a cooling zone 16.
After that, it is water-cooled in the water cooling zone 18, is subjected to descaling treatment and passivation treatment in the pickling tank 20, and is passed through the rinse tank 22 and the dryer 24 to be manufactured. The pickling solution in the pickling tank 20 is cooled by the pickling solution cooling device 26.
【０００３】焼鈍の際の加熱方法としては、直火式で加
熱する方法や、間接式で加熱する方法が知られている。
また、酸洗処理は、中性塩電解、硝酸電解、硝酸、硝塩
酸及び硝弗酸などを組合わせて行われており、この酸洗
処理によりＣｒ含有鋼帯に脱スケールと不動態化が行わ
れる。また、Ｃｒ含有鋼帯の焼鈍方法としては、特公平
２−９０９０号公報に開示されているように、露点−３
０℃〜０℃の還元性雰囲気で焼鈍して酸化膜の厚さを１
５０〜５００オングストロームに制御する方法が知られ
ている。As a heating method at the time of annealing, there are known a direct heating method and an indirect heating method.
Further, the pickling treatment is performed by combining neutral salt electrolysis, nitric acid electrolysis, nitric acid, nitric acid hydrochloric acid, and hydrofluoric acid, and this pickling treatment causes descaling and passivation of the Cr-containing steel strip. Done. Further, as a method for annealing a Cr-containing steel strip, as disclosed in Japanese Patent Publication No. 2-9090, a dew point of -3
Anneal in a reducing atmosphere at 0 ° C to 0 ° C to reduce the thickness of the oxide film to 1
A method of controlling to 50 to 500 angstrom is known.
【０００４】ここで、ステンレス鋼板の製造方法とし
て、特開昭５９−１８２８７６号公報に開示されている
ように、冷間圧延前に機械的研削をした後、酸洗液中に
て溶削し、その後に冷間圧延する方法が知られている。
しかし、この方法は、熱間圧延鋼板を脱スケールした後
に冷間圧延することを特徴とする表面疵防止方法であ
り、冷間圧延後のＣｒ含有鋼帯の耐蝕性向上を目的とす
る本発明とは異なるものである。Here, as a method for producing a stainless steel sheet, as disclosed in Japanese Patent Laid-Open No. 182876/1984, mechanical grinding is performed before cold rolling, and then ablation is performed in a pickling solution. Then, a method of cold rolling is known.
However, this method is a surface flaw prevention method characterized by descaling a hot-rolled steel sheet and then cold-rolling the present invention, which aims to improve the corrosion resistance of a Cr-containing steel strip after cold-rolling. Is different from.
【０００５】さらに、脱スケール方法として、特開昭５
８−２７６９８号公報に開示されているように、前処理
として酸洗を施し、機械的手段により脱スケールを行っ
た後に後処理として酸洗を施す方法が知られているが、
これは熱間圧延鋼板の脱スケール方法であり、冷間圧延
後のＣｒ含有鋼帯の耐触性向上を目的とする本発明とは
異なるものである。Further, as a descaling method, there is a Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Laid-Open No. 8-27698, there is known a method of performing pickling as a pretreatment, performing descaling by a mechanical means, and then performing a pickling as a posttreatment.
This is a descaling method for hot-rolled steel sheets, which is different from the present invention for improving the contact resistance of Cr-containing steel strip after cold rolling.
【０００６】[0006]
【発明が解決しようとする課題】上述した冷間圧延後の
Ｃｒ含有鋼帯の従来の連続焼鈍・酸洗処理では、酸によ
る化学反応を利用して脱スケールと不動態化処理を行っ
ているので、処理ラインの生産能力が酸洗能力で決定さ
れるという問題がある。また、酸洗液中に鋼板の鉄分が
溶解して酸洗能力が変わるので、酸濃度管理が極めて厄
介である。さらに、酸液の化学反応による液温上昇を防
止するために酸液の冷却装置が必要である。さらにま
た、酸濃度や鉄濃度の管理外れによる酸洗不良が発生す
る場合があり、この場合は酸洗処理を再度行う必要があ
り、製造コストが上昇するばかりでなく製造工程に支障
をきたすという問題もある。In the conventional continuous annealing / pickling treatment of the Cr-containing steel strip after the cold rolling described above, descaling and passivation treatment are carried out by utilizing the chemical reaction by the acid. Therefore, there is a problem that the production capacity of the processing line is determined by the pickling capacity. Further, since the iron content of the steel sheet is dissolved in the pickling solution to change the pickling ability, it is extremely difficult to control the acid concentration. Furthermore, a cooling device for the acid solution is necessary to prevent the temperature rise of the solution due to the chemical reaction of the acid solution. Furthermore, poor pickling may occur due to out-of-control of acid concentration or iron concentration, in which case it is necessary to perform the pickling treatment again, which not only increases the manufacturing cost but also hinders the manufacturing process. There are also problems.
【０００７】また、上述の特公平２−９０９０号公報に
開示された方法では、酸化膜の厚さを制御するために露
点が−３０℃〜０℃の範囲内になるように制御している
が、この露点は、普通鋼板を連続焼鈍する際の焼鈍雰囲
気の露点−６０℃〜−４０℃よりもはるかに高い露点で
ある。このため、普通鋼帯の製造からＣｒ含有鋼帯の製
造に切り換える際に焼鈍炉内雰囲気の変更や露点調整が
必要なばかりでなく、鋼板を搬送するロールの表面にコ
ーティングされた溶射皮膜が焼鈍炉内の水蒸気により劣
化するのでロール交換周期が短くなる。この結果、製造
コストの増大を招き、さらにはＣｒ含有鋼帯の製造から
普通鋼鋼帯の製造に切替えると、美麗な表面性状を要求
される一般冷延鋼帯の表面にロール疵（劣化した溶射皮
膜が鋼帯表面に転写することによって発生するロールに
よる押疵）が発生するので製造規制が必要になるという
問題がある。Further, in the method disclosed in Japanese Patent Publication No. 2-9090, the dew point is controlled to fall within the range of -30 ° C to 0 ° C in order to control the thickness of the oxide film. However, this dew point is much higher than the dew point of -60 ° C to -40 ° C in the annealing atmosphere when continuously annealing the ordinary steel sheet. Therefore, not only is it necessary to change the atmosphere in the annealing furnace and adjust the dew point when switching from the production of ordinary steel strips to the production of Cr-containing steel strips, but also the thermal spray coating coated on the surface of the rolls that convey the steel sheet is annealed. Since it deteriorates due to water vapor in the furnace, the roll exchange cycle becomes shorter. As a result, the production cost is increased, and when the production of Cr-containing steel strip is switched to the production of ordinary steel strip, roll defects (deterioration) are caused on the surface of general cold-rolled steel strip which requires beautiful surface properties. There is a problem that manufacturing restrictions are required because roll scratches caused by the transfer of the sprayed coating to the surface of the steel strip occur.
【０００８】本発明は、上記事情に鑑み、従来よりも耐
食性に優れたＣｒ含有耐食性鋼帯を効率良く製造できる
Ｃｒ含有耐食性鋼帯の製造装置及び製造方法を提供する
ことを目的とする。In view of the above circumstances, it is an object of the present invention to provide a Cr-containing corrosion-resistant steel strip manufacturing apparatus and manufacturing method capable of efficiently manufacturing a Cr-containing corrosion-resistant steel strip that is more excellent in corrosion resistance than before.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
の本発明のＣｒ含有耐食性鋼帯の製造方法は、Ｃｒ含有
耐食性鋼帯の製造方法において、冷間圧延後のＣｒ含有
耐食性鋼帯を−７０〜−３０℃の範囲内の露点に調整し
て焼鈍し、焼鈍されたＣｒ含有耐食性鋼帯の酸化膜を機
械的研削によって除去し、前記機械的研削が終了したＣ
ｒ含有耐食性鋼帯に、酸洗による不動態化処理を施すこ
とを特徴とするものである。The method for producing a Cr-containing corrosion-resistant steel strip according to the present invention for achieving the above object is a method for producing a Cr-containing corrosion-resistant steel strip, comprising the steps of: The oxide film of the annealed Cr-containing corrosion-resistant steel strip was removed by mechanical grinding after adjusting the dew point in the range of -70 to -30 ° C and annealing, and the mechanical grinding was completed.
It is characterized in that the r-containing corrosion-resistant steel strip is subjected to passivation treatment by pickling.
【００１０】また、上記目的を達成するための本発明の
Ｃｒ含有耐食性鋼帯の製造装置は、Ｃｒ含有耐食性鋼帯
の製造装置において、冷間圧延後のＣｒ含有耐食性鋼帯
を焼鈍する焼鈍装置と、焼鈍されたＣｒ含有耐食性鋼帯
の酸化膜を機械的研削によって除去する機械的研削装置
と、前記機械的研削が終了したＣｒ含有耐食性鋼帯を不
動態化する酸洗装置とを備えたことを特徴とするもので
ある。Further, the apparatus for producing a Cr-containing corrosion-resistant steel strip according to the present invention for achieving the above object is an apparatus for producing a Cr-containing corrosion-resistant steel strip, comprising an annealing device for annealing the Cr-containing corrosion-resistant steel strip after cold rolling. And a mechanical grinding device for removing an oxide film of the annealed Cr-containing corrosion-resistant steel strip by mechanical grinding, and a pickling device for passivating the Cr-containing corrosion-resistant steel strip after the mechanical grinding. It is characterized by that.
【００１１】ここで、本発明のＣｒ含有耐食性鋼帯の製
造方法及び製造装置は、Ｃｒを１〜１９ｗｔ％含有する
冷間圧延後のＣｒ含有耐食性鋼帯に適用するのが好まし
く、例えば、ＳＵＳ４１０Ｌ（１１．００〜１３．５０
ｗｔ％Ｃｒ）、ＳＵＳ４３０ＬＸ（１６．００〜１９．
００ｗｔ％Ｃｒ）、ＳＵＳ４３６Ｌ（１６．００〜１
９．００ｗｔ％Ｃｒ）、ＳＵＨ４０９ＬＸ（１０．５０
〜１１．７５ｗｔ％Ｃｒ）などがある。また、Ｃｒ含有
量が１ｗｔ％未満では酸洗する必要はない。１９ｗｔ％
を超えても耐食性はそれほど向上しないので実用上限は
１９％とする。Here, the method and apparatus for producing a Cr-containing corrosion-resistant steel strip of the present invention is preferably applied to a Cr-containing corrosion-resistant steel strip after cold rolling containing 1 to 19 wt% of Cr, for example, SUS410L. (11.00 to 13.50
wt% Cr), SUS430LX (16.0-19.
00 wt% Cr), SUS436L (16.00-1)
9.00 wt% Cr), SUH409LX (10.50)
˜11.75 wt% Cr). If the Cr content is less than 1 wt%, pickling is not necessary. 19 wt%
Even if it exceeds, the corrosion resistance does not improve so much, so the practical upper limit is set to 19%.
【００１２】また、焼鈍処理のガス雰囲気は、Ｈ2 ガス
を１０％以下とし、残りを実質的にＮ2 ガスとすること
が好ましい。さらに、機械的研削には、研削ブラシロー
ルやショットブラストを用いることが好ましい。Further, the gas atmosphere for the annealing treatment is preferably such that H 2 gas is 10% or less and the rest is substantially N 2 gas. Further, it is preferable to use a grinding brush roll or shot blast for mechanical grinding.
【００１３】[0013]
【作用】本発明のＣｒ含有耐食性鋼帯の製造方法では、
−７０〜−３０℃の範囲内の露点に調整して焼鈍処理を
施すので、普通鋼帯の製造からＣｒ含有鋼帯の製造に切
り換える際に焼鈍炉内雰囲気の変更や露点調整が不要で
あり、しかも、焼鈍炉内のロールの表面にコーティング
された溶射皮膜の寿命が長くなるのでロール交換周期が
長くなる。このため、製造コストの増大を防止でき効率
よく製造できる。また、Ｃｒ含有鋼帯の製造から普通鋼
帯の製造に切替えた後に、一般冷延鋼帯の表面にロール
疵が発生することを防止できる。また、焼鈍処理が施さ
れたＣｒ含有耐食性鋼帯の酸化膜を機械的研削によって
除去するので、脱スケール能力が向上して生産速度を向
上できる。さらに、酸化膜の除去において機械的研削に
て酸化膜を除去する（一部の研削残りは酸洗で不動態化
処理と同時に除去される）ので酸化膜の除去を容易に安
定して行え、再酸洗等の処理を無くすことができ操業コ
ストを低減できる。また、酸化膜を除去した後に酸洗に
よる不動態化処理を施すので、従来に比べ耐食性に優れ
たＣｒ含有耐食性冷延鋼帯を製造できる。しかも酸洗液
の温度上昇を低減できるので、酸洗液冷却装置を縮小あ
るいは省略できる。なお、機械的研削後のスケール残り
は次の酸洗により完全に除去される。In the method for producing a Cr-containing corrosion-resistant steel strip according to the present invention,
Since the annealing treatment is performed by adjusting the dew point in the range of −70 to −30 ° C., it is not necessary to change the atmosphere in the annealing furnace or adjust the dew point when switching from the production of ordinary steel strip to the production of Cr-containing steel strip. Moreover, the life of the sprayed coating coated on the surface of the roll in the annealing furnace is extended, so that the roll replacement period is extended. Therefore, the manufacturing cost can be prevented from increasing and the manufacturing can be performed efficiently. Further, it is possible to prevent the occurrence of roll flaws on the surface of the general cold rolled steel strip after switching from the production of the Cr-containing steel strip to the production of the ordinary steel strip. Further, since the oxide film of the Cr-containing corrosion-resistant steel strip that has been subjected to the annealing treatment is removed by mechanical grinding, the descaling ability is improved and the production rate can be improved. Further, in removing the oxide film, the oxide film is removed by mechanical grinding (a part of the grinding residue is removed simultaneously with passivation treatment by pickling), so that the oxide film can be easily and stably removed. Processing such as re-pickling can be eliminated and operating costs can be reduced. Further, since the passivation treatment by pickling is performed after removing the oxide film, it is possible to manufacture a Cr-containing corrosion-resistant cold-rolled steel strip which is superior in corrosion resistance to the conventional one. Moreover, since the temperature rise of the pickling solution can be reduced, the pickling solution cooling device can be reduced or omitted. The scale residue after mechanical grinding is completely removed by the next pickling.
【００１４】また、本発明のＣｒ含有耐食性鋼帯の製造
装置によれば、焼鈍処理後にＣｒ含有耐食性鋼帯の酸化
膜を機械的研削によって除去できるので、脱スケール能
力が向上し、しかも酸化膜の除去を容易に安定して行
え、再酸洗等の処理を無くすことができ操業コストを低
減できる。また、機械的研削により酸化膜を除去した後
に酸洗による不動態化処理を施せるので、従来に比べ耐
食性に優れたＣｒ含有耐食性冷延鋼帯を製造できる。Further, according to the apparatus for producing a Cr-containing corrosion-resistant steel strip of the present invention, the oxide film of the Cr-containing corrosion-resistant steel strip can be removed by mechanical grinding after the annealing treatment, so that the descaling ability is improved and the oxide film is further improved. Can be removed easily and stably, and the treatment such as re-pickling can be eliminated and the operating cost can be reduced. Further, since the passivation treatment by pickling can be performed after removing the oxide film by mechanical grinding, it is possible to manufacture a Cr-containing corrosion-resistant cold-rolled steel strip which is superior in corrosion resistance to the conventional one.
【００１５】ここで、Ｃｒを１〜１９ｗｔ％含有する冷
間圧延後のＣｒ含有耐食性鋼帯に適用した場合には、耐
食性が一層向上する。また、焼鈍処理のガス雰囲気を、
Ｈ2 ガスを１０％以下とし、残りを実質的にＮ2 ガスと
した場合は、普通鋼帯を製造する際の焼鈍雰囲気を変更
せずにＣｒ含有耐食性鋼帯の焼鈍処理を行える。When applied to a Cr-containing corrosion-resistant steel strip after cold rolling containing Cr in an amount of 1 to 19 wt%, the corrosion resistance is further improved. In addition, the gas atmosphere of the annealing treatment,
When the H 2 gas is 10% or less and the rest is substantially N 2 gas, the Cr-containing corrosion resistant steel strip can be annealed without changing the annealing atmosphere during the production of the ordinary steel strip.
【００１６】[0016]
【実施例】以下、図面を参照して本発明の実施例を説明
する。図１は、Ｃｒ含有耐食性鋼帯の製造装置の一部を
示す概略構成図であり、図３に示すＣｒ含有耐食性鋼帯
の製造装置と同じ要素は同じ符号で示す。冷間圧延後の
Ｃｒ含有鋼帯１０は、予熱帯１２、加熱帯３０、冷却帯
３２を順次通過し、その後、水冷帯１８で水冷され、研
削ブラシ３４により酸化膜を除去され、酸洗槽３６で不
動態化処理が施され、リンス槽２２、ドライヤ２４を通
過して製造される。尚、酸洗槽３６の中の酸洗液は、酸
洗液冷却装置３８で冷却される。この酸洗液としては、
塩化物を添加した硝酸水溶液を使用しており、濃度は硝
酸濃度２０％、塩酸濃度５％である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a part of an apparatus for producing a Cr-containing corrosion resistant steel strip, and the same elements as those in the apparatus for producing a Cr-containing corrosion resistant steel strip shown in FIG. The cold-rolled Cr-containing steel strip 10 sequentially passes through the pre-tropical zone 12, the heating zone 30, and the cooling zone 32, then is water-cooled by the water-cooling zone 18, the oxide film is removed by the grinding brush 34, and the pickling tank is used. A passivation process is performed at 36, and the pass-through process is performed by passing through the rinse tank 22 and the dryer 24. The pickling solution in the pickling tank 36 is cooled by the pickling solution cooling device 38. As this pickling solution,
An aqueous nitric acid solution containing chloride is used, and the concentration is 20% nitric acid and 5% hydrochloric acid.
【００１７】図１に示されたＣｒ含有耐食性鋼帯の製造
装置を使用して、Ｃｒ含有量の異なる２種類のＣｒ含有
鋼帯を冷間圧延後に、露点を変えて連続焼鈍し、研削ブ
ラシロールにより機械的研削を行い、酸洗による不動態
化処理を行い、耐食性試験を行った。この結果を表１に
示す。耐食性試験方法はＪＩＳ Ｚ ２３７１−１９５
５に規定された方法で行い、３５℃、４時間経過後に耐
食性を評価した。Using the Cr-containing corrosion-resistant steel strip manufacturing apparatus shown in FIG. 1, two types of Cr-containing steel strips having different Cr contents are cold-rolled, then continuously annealed with different dew points, and then a grinding brush is used. Mechanical grinding was performed with a roll, passivation treatment was performed by pickling, and a corrosion resistance test was performed. The results are shown in Table 1. The corrosion resistance test method is JIS Z 2371-195.
The method specified in 5 was performed, and the corrosion resistance was evaluated after 4 hours at 35 ° C.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１から明らかなように、焼鈍処理後のＣ
ｒ含有耐食性鋼帯に研削ブラシロールで機械的な研削を
加えることにより耐食性は向上し、露点が−３０℃以下
であれば製品合格レベルである３以下を達成できる。
尚、工業的に−７０℃未満の露点の焼鈍雰囲気を得るこ
とは操業費用の面から困難である。次に、連続焼鈍炉の
操業において炉内雰囲気の露点を変えて操業を行ったロ
ール表面劣化試験の結果を表２に示す。表２から露点が
低いほどロール劣化を防止することができ、通常操業に
おいてロール摩耗を原因とするロール交換頻度が約６月
であることから、露点は−３０℃以下が適当であること
がわかる。As is clear from Table 1, C after annealing treatment
The corrosion resistance is improved by mechanically grinding the r-containing corrosion resistant steel strip with a grinding brush roll, and if the dew point is −30 ° C. or less, the product passing level of 3 or less can be achieved.
Incidentally, it is difficult to industrially obtain an annealing atmosphere having a dew point of less than -70 ° C from the viewpoint of operating cost. Next, Table 2 shows the results of the roll surface deterioration test in which the dew point of the atmosphere in the furnace was changed during the operation of the continuous annealing furnace. It can be seen from Table 2 that the lower the dew point is, the more the roll deterioration can be prevented, and the roll replacement frequency due to roll wear in normal operation is about 6 months. Therefore, the dew point is -30 ° C or lower. .
【００２０】[0020]
【表２】 [Table 2]
【００２１】次に、焼鈍後に鋼帯表面酸化膜の機械的研
削を行わない従来技術による場合と機械的研削方法とし
てブラシ研削を行った場合とを比較するために、Ｃｒを
１１．３ｗｔ％含有するＣｒ含有耐食性鋼帯を生産速度
を変えて製造し、耐食性試験を行った結果を図２に示
す。製造条件は、露点−３０℃、焼鈍雰囲気ガス組成を
Ｈ2 ガス３％で残りは実質的にＮ2 ガスとし、均熱温度
８８０℃、均熱時間２５秒で焼鈍を行い、機械的研削有
りの条件では１本あたりのブラシロール電流８０Ａで鋼
帯片面２回の研削を実施した。触性試験方法はＪＩＳ
Ｚ ２３７１−１９５５に規定された方法で行い、３５
℃、４時間経過後に耐蝕性を評価した。Next, in order to compare the case of the prior art in which the steel strip surface oxide film is not mechanically ground after annealing and the case of brush grinding as a mechanical grinding method, 11.3 wt% of Cr is contained. FIG. 2 shows the result of corrosion resistance test in which the Cr-containing corrosion-resistant steel strip was manufactured at different production rates. Manufacturing conditions are as follows: dew point -30 ° C., annealing atmosphere gas composition 3% H 2 gas, the rest substantially N 2 gas, annealing at a soaking temperature of 880 ° C., soaking time of 25 seconds, and mechanical grinding. Under these conditions, the steel strip was ground twice on one side with a brush roll current of 80 A per roll. The tactile test method is JIS
Z 2371-1955, 35
The corrosion resistance was evaluated at 4 ° C. for 4 hours.
【００２２】図２から明らかなように、従来の方法では
生産速度７５ｍｐｍ以下でしか合格品を得ることができ
ず、しかも不合格品の発生を避けることができなかった
が、本発明により生産能率を向上できたのみならず、耐
食性試験結果のばらつきも低減することができ、酸洗不
良材の発生をも防止することができた。次に、図１に示
されたＣｒ含有耐食性鋼帯の製造装置を使用して、Ｃｒ
を１１．７ｗｔ％含有する板厚０．９８ｍｍの冷延鋼帯
を生産速度１５０ｍｐｍとし、焼鈍温度８８０℃、均熱
時間２５秒、焼鈍炉内雰囲気ガス組成Ｈ2 ガス３．２
％、Ｎ2 ガス９６．８％、露点−３８℃に調整して焼鈍
し、冷延鋼帯の表裏各２本（合計４本）の研削ブラシロ
ールで１本あたりのブラシロール電流を８１Ａとして機
械的研削を施し、その後、塩化物を添加した硝酸からな
る酸洗液で不動態化処理を実施した。製造された鋼帯の
耐食性試験結果は１．４であり、従来技術で製造した鋼
帯に比べ極めて耐食性に優れた鋼帯を製造できた。As is apparent from FIG. 2, in the conventional method, it was possible to obtain acceptable products only at a production speed of 75 mpm or less, and it was impossible to avoid the occurrence of rejected products. Not only was it possible to improve the corrosion resistance, but it was also possible to reduce variations in the corrosion resistance test results, and it was possible to prevent the occurrence of pickling failure materials. Next, using the Cr-containing corrosion-resistant steel strip manufacturing apparatus shown in FIG.
Of a cold-rolled steel strip having a plate thickness of 0.98 mm containing 11.7 wt% of aluminum, an annealing temperature of 880 ° C., a soaking time of 25 seconds, and an atmosphere gas composition of an annealing furnace H 2 gas 3.2.
%, N 2 gas 96.8%, dew point adjusted to −38 ° C., annealed, and two grinding brush rolls each on the front and back of the cold rolled steel strip (4 in total) with a brush roll current of 81 A per roll. Mechanical grinding was performed, and then passivation treatment was performed with a pickling solution consisting of nitric acid to which chloride was added. The result of the corrosion resistance test of the manufactured steel strip was 1.4, and it was possible to manufacture a steel strip having extremely excellent corrosion resistance as compared with the steel strip manufactured by the conventional technique.
【００２３】[0023]
【発明の効果】以上説明したように本発明によれば、Ｃ
ｒ含有耐食性鋼帯を露点−７０〜−３０℃の雰囲気で焼
鈍し、酸化膜を機械的研削で除去し、その後酸洗による
不動態化処理を施したので、従来技術で製造したＣｒ含
有耐食性鋼帯に比べ耐食性に優れたＣｒ含有耐食性鋼帯
を製造できる。As described above, according to the present invention, C
Since the r-containing corrosion resistant steel strip was annealed in an atmosphere with a dew point of −70 to −30 ° C., the oxide film was removed by mechanical grinding, and then passivated by pickling, the Cr-containing corrosion resistance produced by the conventional technique was used. It is possible to manufacture a Cr-containing corrosion-resistant steel strip that is more excellent in corrosion resistance than a steel strip.
【００２４】また、焼鈍炉内雰囲気の露点を−７０〜−
３０℃の範囲内にしたので焼鈍炉内のロール表面溶射膜
の劣化を防止でき、この結果、ロール交換周期を延長で
きるので設備保全費用を低減できる。また、酸化膜を機
械的研削で除去するので、脱スケール能力が向上し、生
産速度を向上できるばかりでなく、耐食性試験結果のば
らつきを低減でき、耐食性試験不良材の再酸洗等の処理
を省略することができ、この結果、操業コストを低減で
きる。The dew point of the atmosphere in the annealing furnace is -70 to-.
Since the temperature is within the range of 30 ° C., deterioration of the sprayed coating on the roll surface in the annealing furnace can be prevented, and as a result, the roll replacement cycle can be extended and the facility maintenance cost can be reduced. In addition, since the oxide film is removed by mechanical grinding, not only the descaling ability is improved and the production speed is improved, but also variations in the corrosion resistance test results can be reduced, and treatment such as re-pickling of the corrosion resistance test defective material can be performed. It can be omitted, and as a result, operating costs can be reduced.
【００２５】また、酸化膜を機械的研削で除去した後に
酸洗による不動態化処理を行うので、酸洗液の温度上昇
を低減でき、酸洗液冷却装置を縮小あるいは省略するこ
とができる。Further, since the passivation treatment by pickling is performed after removing the oxide film by mechanical grinding, the temperature rise of the pickling solution can be reduced and the pickling solution cooling device can be reduced or omitted.
【図１】本発明のＣｒ含有耐食性鋼帯の製造装置の一実
施例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an example of an apparatus for producing a Cr-containing corrosion-resistant steel strip according to the present invention.
【図２】図１に示すＣｒ含有耐食性鋼帯の製造装置を使
用して製造したＣｒ含有耐食性鋼帯の耐食性試験結果
と、従来の方法で製造したＣｒ含有耐食性鋼帯の耐食性
試験結果とを比べて示すグラフである。FIG. 2 shows a corrosion resistance test result of a Cr-containing corrosion resistant steel strip manufactured using the Cr-containing corrosion resistant steel strip manufacturing apparatus shown in FIG. 1 and a corrosion resistance test result of a Cr-containing corrosion resistant steel strip manufactured by a conventional method. It is a graph shown in comparison.
【図３】従来のＣｒ含有耐食性鋼帯の製造装置を示す概
略構成図である。FIG. 3 is a schematic configuration diagram showing a conventional Cr-containing corrosion-resistant steel strip manufacturing apparatus.
１０ 冷間圧延後のＣｒ含有鋼帯 １２ 予熱帯 ２２ リンス槽 ２４ ドライヤ ３０ 加熱帯 ３２ 冷却帯 ３４ 研削ブラシ ３６ 酸洗槽 ３８ 酸洗液冷却装置 10 Steel strip containing Cr after cold rolling 12 Pre-tropical zone 22 Rinse tank 24 Dryer 30 Heating zone 32 Cooling zone 34 Grinding brush 36 Pickling tank 38 Pickling solution cooling device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２３Ｃ 26/00 Ｃ (72)発明者 柳沼 寛 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 上野 直人 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 笠井 聡 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 山科 正夫 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─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication location C23C 26/00 C (72) Inventor Hiroshi Yaginuma 1 Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Co. Inside the steel mill (72) Naoto Ueno 1 Kawasaki-cho, Chuo-ku, Chiba City Inside the Chiba Steel Works, Kawasaki Steel Co., Ltd. Masao Yamashina 1 Kawasaki-cho, Chuo-ku, Chiba City Kawasaki Steel Co., Ltd. Chiba Works
Claims (2)
て、 冷間圧延後のＣｒ含有耐食性鋼帯を−７０〜−３０℃の
範囲内の露点に調整して焼鈍し、 焼鈍されたＣｒ含有耐食性鋼帯の酸化膜を機械的研削に
よって除去し、 前記機械的研削が終了したＣｒ含有耐食性鋼帯に、酸洗
による不動態化処理を施すことを特徴とするＣｒ含有耐
食性鋼帯の製造方法。1. A method for producing a Cr-containing corrosion-resistant steel strip, wherein the Cr-containing corrosion-resistant steel strip after cold rolling is annealed by adjusting the dew point in the range of −70 to −30 ° C. to anneal it. A method for producing a Cr-containing corrosion-resistant steel strip, characterized in that an oxide film of a steel strip is removed by mechanical grinding, and the Cr-containing corrosion-resistant steel strip after the mechanical grinding is subjected to passivation treatment by pickling.
て、 冷間圧延後のＣｒ含有耐食性鋼帯を焼鈍する焼鈍装置
と、 焼鈍されたＣｒ含有耐食性鋼帯の酸化膜を機械的研削に
よって除去する機械的研削装置と、 前記機械的研削が終了したＣｒ含有耐食性鋼帯を不動態
化する酸洗装置とを備えたことを特徴とするＣｒ含有耐
食性鋼帯の製造装置。2. An apparatus for producing a Cr-containing corrosion-resistant steel strip, comprising: an annealing device for annealing the Cr-containing corrosion-resistant steel strip after cold rolling; and an oxide film of the annealed Cr-containing corrosion-resistant steel strip removed by mechanical grinding. An apparatus for producing a Cr-containing corrosion-resistant steel strip, comprising: a mechanical grinding device; and a pickling device for passivating the Cr-containing corrosion-resistant steel strip that has been mechanically ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6009419A JP2986670B2 (en) | 1994-01-31 | 1994-01-31 | Apparatus and method for producing Cr-containing corrosion-resistant steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6009419A JP2986670B2 (en) | 1994-01-31 | 1994-01-31 | Apparatus and method for producing Cr-containing corrosion-resistant steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07216568A true JPH07216568A (en) | 1995-08-15 |
| JP2986670B2 JP2986670B2 (en) | 1999-12-06 |
Family
ID=11719853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6009419A Expired - Fee Related JP2986670B2 (en) | 1994-01-31 | 1994-01-31 | Apparatus and method for producing Cr-containing corrosion-resistant steel strip |
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| Country | Link |
|---|---|
| JP (1) | JP2986670B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998044168A1 (en) * | 1997-03-27 | 1998-10-08 | Kawasaki Steel Corporation | Chromium-containing hot rolled steel strip and its production method |
| JP2009220250A (en) * | 2008-03-18 | 2009-10-01 | Nisshin Steel Co Ltd | Oxidized scale removing method and oxidized scale removing device for stainless cold rolled stainless steel strip |
-
1994
- 1994-01-31 JP JP6009419A patent/JP2986670B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998044168A1 (en) * | 1997-03-27 | 1998-10-08 | Kawasaki Steel Corporation | Chromium-containing hot rolled steel strip and its production method |
| US6217679B1 (en) * | 1997-03-27 | 2001-04-17 | Kawasaki Steel Corporation | Method for producing chromium-containing hot rolled steel strip |
| JP2009220250A (en) * | 2008-03-18 | 2009-10-01 | Nisshin Steel Co Ltd | Oxidized scale removing method and oxidized scale removing device for stainless cold rolled stainless steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2986670B2 (en) | 1999-12-06 |
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