JPH05202419A - Method for descaling hot rolled silicon steel plate - Google Patents
Method for descaling hot rolled silicon steel plateInfo
- Publication number
- JPH05202419A JPH05202419A JP1229192A JP1229192A JPH05202419A JP H05202419 A JPH05202419 A JP H05202419A JP 1229192 A JP1229192 A JP 1229192A JP 1229192 A JP1229192 A JP 1229192A JP H05202419 A JPH05202419 A JP H05202419A
- Authority
- JP
- Japan
- Prior art keywords
- pickling
- hot
- descaling
- annealing
- silicon 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、けい素鋼熱延板の脱
スケール方法に関し、特に有利な酸洗を行う手法につい
ての開発成果を提案する。けい素鋼板は一般に変圧器や
発電機のモーターなどに用いられ、その特性として高い
磁束密度と低い鉄損が要求される。特に近年は、省エネ
ルギーの観点からその要求が強い。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a descaling method for hot-rolled silicon steel sheets, and proposes the development results of a particularly advantageous method for pickling. Silicon steel sheets are generally used in motors of transformers and generators, and their characteristics require high magnetic flux density and low iron loss. Particularly in recent years, the demand is strong from the viewpoint of energy saving.
【０００２】けい素鋼板の製造は、けい素鋼スラブを熱
間圧延して得た熱延板の表面酸化スケールを酸洗によっ
て除去した後、冷間圧延、次いで仕上げ焼鈍の各工程を
経て行うのが通例で、さらに上記の諸特性の向上に対す
る要求を満足させるため、冷間圧延工程の前に熱延板焼
鈍を施すことが多い。The production of a silicon steel sheet is carried out by removing the surface oxide scale of the hot-rolled sheet obtained by hot rolling a silicon steel slab by pickling, cold rolling and then finish annealing. In order to satisfy the above requirements for improving various properties, hot-rolled sheet annealing is often performed before the cold rolling step.
【０００３】上記製造工程における脱スケールが不完全
であると、製品けい素鋼板の表面性状及び磁気特性の点
で不利となるため、熱延板に付着したスケールは完全に
除去する必要がある。さらにけい素鋼熱延板（以下単に
熱延板と示す）の脱スケール性が、主要成分としてSiを
含有するため一般鋼に比べて劣ることからも、該熱延板
に対する酸洗は不可欠である。Incomplete descaling in the above manufacturing process is disadvantageous in terms of surface properties and magnetic properties of the product silicon steel sheet, and therefore it is necessary to completely remove the scale attached to the hot rolled sheet. Furthermore, since the descaling property of silicon steel hot rolled sheet (hereinafter simply referred to as hot rolled sheet) is inferior to that of general steel because it contains Si as a main component, pickling of the hot rolled sheet is indispensable. is there.
【０００４】[0004]
【従来の技術】この熱延板の酸洗においては上記の脱ス
ケール性が問題になる一方、酸洗が過度に施されると粒
界侵食が生じる懸念がある。すなわち熱間圧延後の熱延
板を高温で巻取る際には表層部の粒界酸化が不可避に生
じ、そして次工程の酸洗を必要以上に続けると、この酸
化された粒界が優先的に侵食されて窪みが形成され、引
続く冷間圧延での微小クラックの発生原因となって圧延
後の表面性状を劣化する。さらに微小クラックは仕上焼
鈍の際に微細粒の発生核となり、磁気特性とくに鉄損の
劣化をもたらす上、絶縁被膜の均一化を阻害する等の問
題となる。2. Description of the Related Art In the pickling of this hot rolled sheet, the above-mentioned descaling property becomes a problem, but if the pickling is excessively carried out, grain boundary corrosion may occur. That is, when rolling the hot-rolled sheet after hot rolling at a high temperature, grain boundary oxidation of the surface layer portion inevitably occurs, and if pickling in the next step is continued more than necessary, this oxidized grain boundary is preferentially Corrosion of the steel leads to the formation of pits, which causes microcracks in the subsequent cold rolling and deteriorates the surface quality after rolling. Further, the microcracks become nuclei for the generation of fine grains during finish annealing, which leads to deterioration of magnetic properties, especially iron loss, and also hinders uniformization of the insulating coating.
【０００５】酸洗における脱スケール量の調整は、酸洗
槽での通板速度を変化することによって行うのが通例で
ある。しかしながらけい素鋼熱延板の焼鈍時間は鋼種に
よって最適範囲があって、この焼鈍時間を大きく変更す
ることは品質の悪化をまねくため困難である。従ってけ
い素鋼熱延板では、一定速度の通板下で酸洗を行うこと
が余儀なくされ、表面品質を犠牲にしなくてはならない
こともあった。なお通板速度の変化を焼鈍炉側で吸収す
るには、焼鈍炉側に大規模で複雑な装置を必要とし、し
かも該装置の制御応答性を期待することはできない。The amount of descaling in pickling is usually adjusted by changing the strip passing speed in the pickling tank. However, the annealing time of the hot-rolled silicon steel sheet has an optimum range depending on the steel type, and it is difficult to greatly change the annealing time because it may deteriorate the quality. Therefore, in the hot-rolled silicon steel sheet, it has been unavoidable that the pickling is performed under the passage of a constant speed, and the surface quality may have to be sacrificed. In order for the annealing furnace side to absorb the change in the strip passing speed, a large-scale and complicated device is required on the annealing furnace side, and the control response of the device cannot be expected.
【０００６】[0006]
【発明が解決しようとする課題】そこでこの発明は、一
定の通板速度での連続した処理を実現するための新たな
方途について提案することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a new method for realizing continuous processing at a constant sheet passing speed.
【０００７】[0007]
【課題を解決するための手段】この発明は、けい素鋼ス
ラブを熱間圧延して熱延板となし、その熱延板を連続焼
鈍し引き続き酸洗を施した後、１回又は２回の冷間圧延
を含む通常のけい素鋼板製造工程を経て、けい素鋼板を
製造するに当たり、上記熱延板焼鈍にて、鋼板温度が40
0 ℃以上となる温度領域でのガス燃焼雰囲気における空
気比を制御することで焼鈍後の熱延板のスケール厚みを
調整し、次いでメカニカルデスケーリングを施して所定
のスケール厚みまで脱スケールを進行させた後、熱延板
の酸洗液への浸漬長さを調節することで酸洗における脱
スケール量を調整することを特徴とするけい素鋼熱延板
の脱スケール方法である。According to the present invention, a silicon steel slab is hot-rolled to form a hot-rolled sheet, and the hot-rolled sheet is continuously annealed and subsequently pickled, and then once or twice. In producing a silicon steel sheet through a normal silicon steel sheet manufacturing process including cold rolling of, in the above hot-rolled sheet annealing, the steel sheet temperature is 40%.
The scale thickness of the annealed hot-rolled sheet is adjusted by controlling the air ratio in the gas combustion atmosphere in the temperature range of 0 ° C or higher, and then mechanical descaling is performed to advance descaling to a predetermined scale thickness. After that, the descaling amount in pickling is adjusted by adjusting the immersion length of the hot rolled sheet in the pickling solution.
【０００８】[0008]
【作用】熱延板の焼鈍は通常直火式の連続焼鈍によって
行われ、焼鈍炉の入口及び出口はシールされて炉内と外
気（大気）とを隔絶しているため、燃焼ガスの空気比を
変化することで炉内雰囲気を酸化性又は非酸化性に調整
可能である。そしてこの発明では、まず熱延板焼鈍にお
ける炉内雰囲気を制御することによって焼鈍後の熱延板
のスケール厚みを調整し、鋼種によって最適焼鈍時間が
変化しても、酸洗における脱スケール性を一定範囲に調
整したものである。[Operation] Annealing of hot-rolled sheet is usually performed by direct annealing, and the inlet and outlet of the annealing furnace are sealed to isolate the inside of the furnace from the outside air (atmosphere). It is possible to adjust the atmosphere in the furnace to be oxidizing or non-oxidizing by changing In the present invention, first, the scale thickness of the hot-rolled sheet after annealing is adjusted by controlling the furnace atmosphere in the hot-rolled sheet annealing, and even if the optimum annealing time changes depending on the steel type, the descaling property in pickling can be improved. It is adjusted within a certain range.
【０００９】すなわち図１に熱延板焼鈍における燃焼ガ
ス雰囲気中の空気比と焼鈍後のスケール厚みとの関係を
示すように、空気比1.0 を境にしてスケール厚みの増減
をはかれることがわかる。従って酸洗における通板速度
をその前工程の焼鈍における通板速度と一致させるに当
たり、酸洗における通板速度を遅くしたい場合は空気比
1.0 以上の酸化性燃焼ガス雰囲気中で焼鈍を行ってスケ
ール厚みを厚くし、逆に通板速度を速くしたい場合は空
気比1.0 未満の非酸化性燃焼ガス雰囲気中で焼鈍を行っ
てスケール厚みを薄くすればよく、これらを適宜組み合
わすことによって、複数鋼種の連続酸洗をその焼鈍と同
一の通板速度下で行うことが可能である。That is, as shown in FIG. 1, which shows the relationship between the air ratio in the combustion gas atmosphere during hot-rolled sheet annealing and the scale thickness after annealing, it can be seen that the scale thickness can be increased or decreased at an air ratio of 1.0. Therefore, in order to match the strip running speed in pickling with the strip running speed in the annealing in the previous step, if you want to reduce the strip running speed in pickling, the air ratio
If you want to increase the scale thickness by annealing in an oxidizing combustion gas atmosphere of 1.0 or more, and conversely to increase the strip running speed, anneal in a non-oxidizing combustion gas atmosphere with an air ratio of less than 1.0 to reduce the scale thickness. It suffices to make thin, and by appropriately combining these, it is possible to carry out continuous pickling of a plurality of steel types at the same strip passing speed as the annealing.
【００１０】さらに上記の焼鈍を経た熱延板にメカニカ
ルデスケーリングを施すことによって、酸洗前のスケー
ル厚みの調整をさらに行う。ここにメカニカルデスケー
リングは、ショットブラスト法、サンドブラスト法、研
削法、軽圧下圧延法（スキンパス圧延）、繰り返し曲げ
法等を適用できる。メカニカルデスケーリングの一例と
してショットブラスト法によるデスケーリングを焼鈍後
の熱延板に施した場合について、その後の酸洗における
脱スケール量とショット投射量との関係を図２に示す。
同図に示すように、ショット投射によってスケール厚み
の減少を達成できることがわかる。なお図示例ではショ
ット投射量が50kg/m2 をこえると効果が飽和するので、
40〜50kg/m2 の範囲を常用するとよい。Further, the hot rolled sheet that has been annealed as described above is subjected to mechanical descaling to further adjust the scale thickness before pickling. Here, for mechanical descaling, a shot blasting method, a sand blasting method, a grinding method, a light reduction rolling method (skin pass rolling), a repeated bending method, or the like can be applied. As an example of mechanical descaling, FIG. 2 shows the relationship between the descaling amount and the shot projection amount in the subsequent pickling when the hot-rolled sheet after annealing is subjected to descaling by the shot blasting method.
As shown in the figure, it can be seen that reduction of the scale thickness can be achieved by shot projection. In the example shown in the figure, the effect is saturated when the shot projection rate exceeds 50 kg / m 2 , so
The range of 40 to 50 kg / m 2 should be used regularly.
【００１１】次に上記した焼鈍雰囲気制御にメカニカル
デスケーリングを組合わせることで、酸洗前の熱延板に
おける脱スケール性を一定範囲に調整した後、酸洗を施
す。酸洗工程においては、酸洗前の熱延板のスケール厚
みに応じて酸洗時間が決定され、一方焼鈍時間の規制か
ら通板速度が決定されるため、図３に示すように、必要
な酸洗時間及び通板速度に基づいて熱延板の酸洗液中へ
の浸漬長さを調節し、所期した脱スケールを完了させ
る。ここで熱延板の浸漬長さは、例えば酸洗槽の全長が
60ｍの場合について図４(a) 〜(d) に示すように、60
ｍ、40ｍ、20ｍ、そして45ｍのように調節できる。なお
同図において、１は熱延板、２は酸洗槽、３は浸漬ロー
ル及び４は酸洗液である。Next, mechanical descaling is combined with the above-described annealing atmosphere control to adjust the descaling property of the hot rolled sheet before pickling to a certain range, and then pickling is performed. In the pickling step, the pickling time is determined according to the scale thickness of the hot-rolled sheet before pickling, and the stripping speed is determined based on the regulation of the annealing time. Therefore, as shown in FIG. The immersion length of the hot-rolled sheet in the pickling solution is adjusted based on the pickling time and the plate passing speed, and the desired descaling is completed. Here, the immersion length of the hot-rolled sheet is, for example, the total length of the pickling tank.
As shown in Fig. 4 (a) to (d) for the case of 60 m,
It can be adjusted to m, 40m, 20m, and 45m. In the figure, 1 is a hot rolled plate, 2 is a pickling tank, 3 is a dipping roll, and 4 is a pickling solution.
【００１２】[0012]
【実施例】基本成分としてAlとMnを含み、かつSi含有量
が0.2 wt％、1.5 wt％及び3.5 wt％のけい素鋼熱延板に
対し、鋼種毎に設定した通板速度の下に、表１に示す条
件に従って焼鈍、メカニカルデスケーリング及び酸洗を
それぞれ施すに当たり、特に同表に示す熱延板の酸洗液
中への浸漬長での酸洗を行った結果、完全な脱スケール
に必要な酸洗時間を確保できた。なお酸洗液には、濃度
６％及び温度85℃の塩酸を用いた。[Example] For a hot-rolled silicon steel sheet containing Al and Mn as basic components and having Si contents of 0.2 wt%, 1.5 wt% and 3.5 wt%, under the striping speed set for each steel type When performing annealing, mechanical descaling and pickling according to the conditions shown in Table 1, in particular, as a result of performing pickling at the immersion length of the hot rolled sheet shown in the same table in the pickling solution, complete descaling was performed. The required pickling time was secured. As the pickling solution, hydrochloric acid having a concentration of 6% and a temperature of 85 ° C. was used.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】この発明によれば、鋼種に応じて変化す
る焼鈍時間に応じた通板速度の下に酸洗を行うことがで
き、けい素鋼板の磁気特性において重要な焼鈍条件等を
優先して選択できかつ、酸洗後に得られる熱延板の表面
性状は良好であるため、特にけい素鋼板の連続製造ライ
ンに最適の脱スケール方法を提供し得る。According to the present invention, pickling can be carried out at a stripping speed corresponding to the annealing time which varies depending on the steel type, and priority is given to the annealing conditions which are important in the magnetic properties of silicon steel sheets. Since the hot rolled sheet obtained after pickling has good surface properties, it is possible to provide an optimal descaling method especially for a continuous production line of silicon steel sheets.
【図１】焼鈍雰囲気とスケール厚みとの関係を示すグラ
フである。FIG. 1 is a graph showing the relationship between annealing atmosphere and scale thickness.
【図２】ショット投射量と脱スケール量との関係を示す
グラフである。FIG. 2 is a graph showing a relationship between a shot projection amount and a descaling amount.
【図３】種々の通板速度における酸洗時間と熱延板の酸
洗液中への浸漬長との関係を示すグラフである。FIG. 3 is a graph showing the relationship between the pickling time at various sheet passing speeds and the immersion length of the hot rolled sheet in the pickling solution.
【図４】熱延板の酸洗液中への浸漬長の調節要領を示す
模式図である。FIG. 4 is a schematic diagram showing how to adjust the immersion length of a hot rolled sheet in a pickling solution.
１ 熱延板 ２ 酸洗槽 ３ 浸漬ロール ４ 酸洗液 1 Hot-rolled sheet 2 Pickling tank 3 Immersion roll 4 Pickling solution
Claims (1)
なし、その熱延板を連続焼鈍し引き続き酸洗を施した
後、１回又は２回の冷間圧延を含む通常のけい素鋼板製
造工程を経て、けい素鋼板を製造するに当たり、 上記熱延板焼鈍にて、鋼板温度が400 ℃以上となる温度
領域でのガス燃焼雰囲気における空気比を制御すること
で焼鈍後の熱延板のスケール厚みを調整し、次いでメカ
ニカルデスケーリングを施して所定のスケール厚みまで
脱スケールを進行させた後、熱延板の酸洗液への浸漬長
さを調節することで酸洗における脱スケール量を調整す
ることを特徴とするけい素鋼熱延板の脱スケール方法。1. A normal rolling process in which a silicon steel slab is hot-rolled to form a hot-rolled sheet, the hot-rolled sheet is continuously annealed and subsequently pickled, and then cold-rolled once or twice. In producing a silicon steel sheet through the silicon steel sheet manufacturing process, in the above hot-rolled sheet annealing, by controlling the air ratio in the gas combustion atmosphere in the temperature range where the steel sheet temperature is 400 ° C or more, After adjusting the scale thickness of the hot-rolled sheet, and then performing mechanical descaling to advance descaling to a predetermined scale thickness, in the pickling by adjusting the immersion length of the hot-rolled sheet in the pickling solution A method for descaling a hot-rolled silicon steel sheet, which comprises adjusting the amount of descaling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1229192A JPH05202419A (en) | 1992-01-27 | 1992-01-27 | Method for descaling hot rolled silicon steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1229192A JPH05202419A (en) | 1992-01-27 | 1992-01-27 | Method for descaling hot rolled silicon steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05202419A true JPH05202419A (en) | 1993-08-10 |
Family
ID=11801242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1229192A Pending JPH05202419A (en) | 1992-01-27 | 1992-01-27 | Method for descaling hot rolled silicon steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05202419A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001061073A3 (en) * | 2000-02-16 | 2002-04-25 | Sms Demag Ag | Method and device for pickling rolled metal, in particular steel strip |
| WO2013131211A1 (en) * | 2012-03-09 | 2013-09-12 | 宝山钢铁股份有限公司 | Method for producing silicon steel normalizing substrate |
| WO2013131212A1 (en) * | 2012-03-08 | 2013-09-12 | 宝山钢铁股份有限公司 | Method for producing silicon steel normalizing substrate |
-
1992
- 1992-01-27 JP JP1229192A patent/JPH05202419A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001061073A3 (en) * | 2000-02-16 | 2002-04-25 | Sms Demag Ag | Method and device for pickling rolled metal, in particular steel strip |
| WO2013131212A1 (en) * | 2012-03-08 | 2013-09-12 | 宝山钢铁股份有限公司 | Method for producing silicon steel normalizing substrate |
| JP2015515540A (en) * | 2012-03-08 | 2015-05-28 | バオシャン アイアン アンド スティール カンパニー リミテッド | Method for producing normalized silicon steel substrate |
| US9738946B2 (en) | 2012-03-08 | 2017-08-22 | Baoshan Iron & Steel, Co., Ltd. | Method for producing silicon steel normalizing substrate |
| WO2013131211A1 (en) * | 2012-03-09 | 2013-09-12 | 宝山钢铁股份有限公司 | Method for producing silicon steel normalizing substrate |
| US9822423B2 (en) | 2012-03-09 | 2017-11-21 | Baoshan Iron & Steel, Co., Ltd. | Method for producing silicon steel normalizing substrate |
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