JPH0633257A - Manufacture of thin grain-oriented silicon steel sheet - Google Patents
Manufacture of thin grain-oriented silicon steel sheetInfo
- Publication number
- JPH0633257A JPH0633257A JP18831892A JP18831892A JPH0633257A JP H0633257 A JPH0633257 A JP H0633257A JP 18831892 A JP18831892 A JP 18831892A JP 18831892 A JP18831892 A JP 18831892A JP H0633257 A JPH0633257 A JP H0633257A
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- Prior art keywords
- mgo
- coil
- steel sheet
- annealing
- strain
- Prior art date
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- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、一方向性電磁鋼板コイ
ル状を高温仕上焼鈍する場合に発生する熱歪を低減する
ための、コイルの高温仕上焼鈍方法およびその装置に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil high temperature finish annealing method and apparatus for reducing thermal strain generated when high temperature finish annealing is performed on a coil of unidirectional electrical steel sheet.
【０００２】[0002]
【従来の技術】方向性電磁鋼板は多くの工程を経て製品
化され、特に高磁束密度一方向性電磁鋼板においては特
性や製品プロフィル向上のために厳格な工程管理が成さ
れている。すなわち、成分調整された溶鋼から製造され
たスラブを熱間圧延し、この熱延板を必要により焼鈍
し、一回または中間焼鈍を含む二回以上の冷間圧延して
最終厚みとした鋼帯に脱炭および一次再結晶焼鈍（以下
脱炭焼鈍という。）を施してから焼鈍分離剤を塗布せし
め、コイルに巻取った後に高温仕上焼鈍を実施し、さら
に絶縁被膜を被覆する処理を主工程とするが、特に高温
仕上焼鈍では堅く巻かれたコイルを１２００℃近傍の高
温長時間処理を行うために、熱歪の発生が避けられない
問題となっている。2. Description of the Related Art Grain-oriented electrical steel sheets are manufactured into products through many processes, and particularly high-flux-density unidirectional electrical steel sheets are subjected to strict process control in order to improve the characteristics and product profile. That is, hot rolling a slab manufactured from molten steel with adjusted composition, this hot rolled sheet is annealed as necessary, and cold rolled one or more times including intermediate annealing to obtain a final thickness steel strip. Decarburization and primary recrystallization anneal (hereinafter referred to as decarburization anneal), then apply an annealing separating agent, wind it on a coil, perform high-temperature finishing anneal, and then cover with an insulating coating. However, particularly in the high temperature finish annealing, since the coil tightly wound is subjected to the high temperature long time treatment at around 1200 ° C., the occurrence of thermal strain is an unavoidable problem.
【０００３】この熱歪には、コイル外周部分の板幅中央
部位に発生する中歪みと、板幅側端部位に発生する側歪
みがある。中歪みは高温仕上焼鈍の冷却の際にはコイル
の半径方向に温度差を生じてコイル外周部に中歪が発生
し、側歪みは焼鈍炉のコイル受け台とコイルとの熱膨張
差や、特に薄物のコイルではその下側部の単位加重が大
きくなることにより発生し、これらが形状不良部とな
る。この様な中歪の発生を防止するために実開昭５６−
１０３０４６号公報では、コイルを覆うインナーケース
の側面全周に断熱材を設け、この断熱材をヒ−タに面す
る側を厚く、他のコイルに面する側を薄くすることによ
りコイル半径方向の温度偏差をなくする焼鈍炉を開示し
ている。The thermal strain includes a medium strain generated at the central portion of the plate width on the outer peripheral portion of the coil and a side strain generated at the end portion on the plate width side. Medium strain causes a temperature difference in the radial direction of the coil during cooling during high-temperature finish annealing, causing medium strain at the coil outer periphery, and side strain causes a difference in thermal expansion between the coil pedestal and coil of the annealing furnace, Particularly, in the case of a thin coil, this is caused by an increase in the unit weight on the lower side thereof, and these become defective shapes. In order to prevent the occurrence of such medium distortion,
In 103046, a heat insulating material is provided on the entire circumference of the side surface of an inner case that covers the coil, and the heat insulating material is thickened on the side facing the heater and thinned on the side facing the other coils, whereby the coil radial direction is improved. An annealing furnace that eliminates temperature deviation is disclosed.
【０００４】また、特開昭６１−５２３２０号公報には
コイルの下端面に、その最外周から半径方向に長さ３０
〜５０mm範囲に高さ数mmの勾配を付すと共にその部分の
巻張力を中心部より大きくし、このようにして形成した
コイルを受台に載置して仕上焼鈍をすることにより、コ
イル下端部の熱歪（側歪）を低減することが開示されて
いる。 前記実開昭５６−１０３０４６号公報に記述し
ているコイル半径方向の入熱制御手段では、設備コスト
が極めて高くなり、かつコイルに導入された局部的な応
力集中によって発生するコイルラップ間隙の不均一に基
づく熱歪の抜本的な解消は困難であり、また後者の方法
ではこにようなコイル形状の巻き方が複雑であり、しか
も側歪だけの対策に過ぎない。Further, in Japanese Patent Laid-Open No. 61-52320, a coil having a length of 30 at the lower end surface in the radial direction from the outermost circumference thereof is disclosed.
A coil having a height of several mm is applied in the range of up to 50 mm and the winding tension of that portion is made larger than the central portion, and the coil thus formed is placed on a pedestal and finish-annealed. It is disclosed to reduce the thermal strain (side strain) of. In the heat input control means in the coil radial direction described in Japanese Utility Model Laid-Open No. 56-103046, the equipment cost becomes extremely high, and the coil wrap gap caused by the local stress concentration introduced in the coil is not generated. It is difficult to radically eliminate thermal strain based on uniformity, and the latter method requires complicated winding of the coil shape, and is only a measure against lateral strain.
【０００５】[0005]
【発明が解決しようとする課題】熱歪はその部位で発生
原因が異なり、上記従来法のようにそれに応じた対策が
必要とされていた。本発明者等は、前記一方向性電磁鋼
板の製造工程で、脱炭焼鈍処理を施した鋼板はＭｇＯを
塗布した後コイルに巻取り、このコイルを高温仕上焼鈍
した場合に発生する中、側歪が、該コイルにＭｇＯ塗布
量と相関があることを確認した。すなわち本発明は、脱
炭焼鈍済み鋼板に調整された量のＭｇＯを塗布すること
により、高温仕上焼鈍で発生する中歪及び側歪を同時に
防止するための薄物方向性電磁鋼板の製造方法を提供す
ることを目的とする。The cause of the thermal strain is different at that portion, and it is necessary to take appropriate measures as in the conventional method. In the manufacturing process of the unidirectional electrical steel sheet, the inventors of the present invention apply a decarburization-annealed steel sheet to a coil after applying MgO, and then wind the coil at a high temperature finish annealing. It was confirmed that the strain correlates with the amount of MgO applied to the coil. That is, the present invention provides a method for manufacturing a thin-oriented grain-oriented electrical steel sheet for simultaneously preventing medium strain and lateral strain generated in high temperature finish annealing by applying a controlled amount of MgO to a decarburized and annealed steel sheet. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に本発明は以下の構成を要旨とする。すなわち、方向性
電磁鋼板の処理工程において、一回または中間焼鈍を含
む二回以上の冷間圧延で０．２５mm以下の最終板厚にし
た鋼板を、脱炭焼鈍後ＭｇＯを主成分とする焼鈍分離材
（以下ＭｇＯという。）を塗布してから高温仕上げ焼鈍
を施すにあたり、ＭｇＯを塗布したコイルが下記式を満
足するように、前記ＭｇＯ塗布量を調整することを特徴
とする薄物方向性電磁鋼板の製造方法。 ０．９０≦Ｗ／（Ｖ×ρ）≦０．９２ ただし、Ｗ；ＭｇＯ塗布コイル重量（kg） Ｖ；ＭｇＯ塗布コイル体積（ｍ3 ） ρ；鋼板密度（kg／ｍ3 ） 以下に本発明を詳細に説明する。脱炭焼鈍済に鋼板に塗
布するＭｇＯは、高温仕上焼鈍でコイル鋼板の焼き付き
防止及びグラスフィルムを形成するために、その塗布量
を決めるが、通常は２ｇ／ｍ3 程度である。この様な従
来の処理方法では熱歪の発生が鋼板の長い領域に亘って
ばらついている。In order to achieve the above object, the present invention has the following structures. That is, in the processing step of the grain-oriented electrical steel sheet, a steel sheet having a final sheet thickness of 0.25 mm or less by one or more cold rolling including intermediate annealing is annealed after decarburization annealing with MgO as a main component. When applying a high temperature finish annealing after applying a separating material (hereinafter referred to as MgO), the MgO application amount is adjusted so that the MgO applied coil satisfies the following formula: Steel plate manufacturing method. 0.90 ≦ W / (V × ρ) ≦ 0.92 where W: MgO coating coil weight (kg) V; MgO coating coil volume (m 3 ) ρ; Steel plate density (kg / m 3 ) Will be described in detail. The amount of MgO applied to the steel sheet after decarburization annealing is determined in order to prevent seizure of the coil steel sheet and to form a glass film by high temperature finish annealing, but the application amount is usually about 2 g / m 3 . In such a conventional processing method, the generation of thermal strain varies over a long area of the steel sheet.
【０００７】本発明者等はこのような熱歪のばらつき調
査したところ、この原因がＭｇＯの塗布量と大きく関係
するコイル占積率と最も強い相関があることを知見し
た。すなわちＭｇＯは断熱効果が大きいことから塗布量
多くするほどコイル半径方向に入熱を防いで中歪の発生
を抑制出来ること、しかし塗布量が多くなるとコイルの
剛性が低下する傾向になり側歪の発生が多くなることか
ら、ＭｇＯの塗布量を調整することによりコイル占積率
〔ＭｇＯ塗布コイル重量Ｗ［kg］／（ＭｇＯ塗布コイル
体積Ｖ［ｍ3 ］×鋼板密度ρ［Kg／ｍ3 ］）〕を適性の
範囲にすれば中歪と側歪の両方を低減出来ることを確認
した。以下に実施例で本発明を具体的に説明する。The inventors of the present invention have investigated the variation of such thermal strain, and have found that the cause has the strongest correlation with the coil space factor, which is largely related to the coating amount of MgO. That is, since MgO has a large heat insulation effect, the more the coating amount is, the more heat can be prevented in the radial direction of the coil to suppress the generation of medium strain. However, when the coating amount is large, the rigidity of the coil tends to decrease, and the side strain Since the amount of generated MgO increases, the coil space factor [MgO applied coil weight W [kg] / (MgO applied coil volume V [m 3 ] × steel plate density ρ [Kg / m 3 ]] can be adjusted by adjusting the amount of MgO applied. It was confirmed that both the medium strain and the lateral strain can be reduced by setting)] to an appropriate range. The present invention will be specifically described below with reference to examples.
【０００８】[0008]
【実施例１】重量でＣ：０．０７５％，Ｓｉ：３．２５
％，Ｍｎ：０．０７％，Ｓ：０．０２５％，Ａｌ：０．
０２７％，Ｎ：０．００８％，Ｓｎ：０．１０％，Ｃ
ｕ：０．０５％，残部実質的にＦｅよりなるスラブを１
３８０℃に加熱後熱間圧延を行い、熱延鋼帯を製造し
た。この鋼帯を予備圧延した後１１２０℃で短時間の焼
鈍を行い、次いで冷間圧延を施して最終板厚０．２３m
m、板幅９８０mmの冷延板とした。この冷延鋼板を連続
脱炭焼鈍炉で脱炭した後、ＭｇＯを主成分とする焼鈍分
離剤（ＭｇＯという）を塗布、乾燥し、これを巻き取っ
た１５屯コイルを５個製造した。各コイルの占積率〔Ｗ
／（Ｖ×ρ）〕を表１に示した。またＭｇＯ塗布量（ｇ
／ｍ3 ) とコイル占積率（％）との関係を図１に示し
た。Example 1 C: 0.075% by weight, Si: 3.25
%, Mn: 0.07%, S: 0.025%, Al: 0.
027%, N: 0.008%, Sn: 0.10%, C
u: 0.05%, 1 slab consisting essentially of Fe
After heating to 380 ° C., hot rolling was performed to manufacture a hot rolled steel strip. This steel strip is pre-rolled, then annealed at 1120 ° C for a short time, and then cold-rolled to a final thickness of 0.23 m.
A cold-rolled sheet having a width of m and a sheet width of 980 mm was used. After decarburizing this cold-rolled steel sheet in a continuous decarburizing annealing furnace, an annealing separating agent containing MgO as a main component (referred to as MgO) was applied and dried, and five 15-ton coils were produced by winding the coil. Space factor of each coil [W
/ (V × ρ)] is shown in Table 1. The amount of MgO applied (g
/ M 3 ) and the coil space factor (%) are shown in FIG.
【０００９】これらのコイルを１１７０℃に加熱し３０
時間均熱する高温仕上焼鈍を施した後、８５０℃で３０
秒保定する連続仕上焼鈍を行った。その結果、発生した
中歪長さ（ｍ）と、側歪最大深さ（mm）を表１に示す。
なお中歪長さ（ｍ）と側歪最大深さの模式図を図２に示
す。Heating these coils to 1170 ° C.
After performing high-temperature finishing annealing for soaking for 30 hours,
A continuous finish annealing was carried out with a second retention. As a result, Table 1 shows the generated medium strain length (m) and the maximum lateral strain depth (mm).
A schematic diagram of the medium strain length (m) and the maximum lateral strain depth is shown in FIG.
【００１０】[0010]
【表１】 [Table 1]
【００１１】表１の中歪長さと側歪最大深さ測定値を図
３に示した。表１及び図３から明らかの様に、コイル占
積率が増加すると、すなわちＭｇＯ塗布量が少なくなる
と鋼板に側歪発生深さは少なくなるが、逆に中歪の発生
長さは増加しており、Ｎｏ．１では側歪発生深さが大き
く、Ｎｏ．５，６では中歪長さが長くなる。この結果か
らＮｏ．２，３，４のコイルが中歪及び側歪の両方とも
が低い値を示しており、従ってコイル占積率を０．９１
〜０．９２とするのが好ましいことが分る。The measured values of the medium strain length and the maximum lateral strain depth in Table 1 are shown in FIG. As is clear from Table 1 and FIG. 3, when the coil space factor increases, that is, when the MgO coating amount decreases, the lateral strain generation depth decreases in the steel plate, but conversely, the medium strain generation length increases. No. In No. 1, the side strain occurrence depth is large, and No. In Nos. 5 and 6, the medium strain length becomes long. From this result, No. The coils 2, 3 and 4 show low values for both the medium strain and the side strain, and therefore the coil space factor is 0.91.
It turns out that it is preferable to set it to ˜0.92.
【００１２】[0012]
【実施例２】実施例１と同様の成分からなる鋼を同様な
工程で最終板厚０．１８mm，板幅９７０mmの冷延板と
し、この鋼板を連続脱炭焼鈍炉で脱炭した後、ＭｇＯを
主成分とする焼鈍分離剤（ＭｇＯという）を塗布、乾燥
し、これを巻き取った１５屯コイルを６個製造した。各
コイルの占積率〔Ｗ／（Ｖ×ρ）〕を表２に示した。Example 2 A steel having the same composition as in Example 1 was used in the same process to form a cold rolled sheet having a final sheet thickness of 0.18 mm and a sheet width of 970 mm, and this steel sheet was decarburized in a continuous decarburizing annealing furnace, An annealing separator having MgO as a main component (referred to as MgO) was applied, dried, and wound to manufacture six 15 ton coils. Table 2 shows the space factor [W / (V × ρ)] of each coil.
【００１３】これらのコイルを１１７０℃に加熱し３０
時間均熱する高温仕上焼鈍を施した後、８５０℃で３０
秒保定する連続仕上焼鈍を行った。その結果、発生した
中歪長さ（ｍ）と、側歪最大深さ（mm）を表２に示す。Heating these coils to 1170 ° C.
After performing high-temperature finishing annealing for soaking for 30 hours,
A continuous finish annealing was carried out with a second retention. As a result, Table 2 shows the generated medium strain length (m) and the maximum lateral strain depth (mm).
【００１４】[0014]
【表２】 [Table 2]
【００１５】表２の中歪長さと側歪最大深さ測定値を図
４に示した。表２及び図４から分かるようにＮｏ．２，
３，４のコイルが中歪及び側歪の両歪とも低い値を示し
ており、従って占積率を０．９０〜０．９２とするのが
好ましい。The measured values of medium strain length and maximum lateral strain depth in Table 2 are shown in FIG. As can be seen from Table 2 and FIG. Two
The coils 3 and 4 show low values for both the medium strain and the side strain, and therefore the space factor is preferably set to 0.90 to 0.92.
【００１６】この様に本発明で熱歪を低減させるため
に、従来よりＭｇＯ塗布量がやや多めになるが、これは
従来ややもすればポーラスなグラスフィルムが形成され
ていたのに対し、本発明では緻密かつ均一なグラスフィ
ルムが被覆されると共に高温仕上焼鈍時におけるコイル
のスペーサの役割を十分に発揮できる。そのためにも少
なくとも４ｇ／ｍ3 のＭｇＯ塗布量とすることが好まし
い。As described above, in order to reduce the thermal strain in the present invention, the coating amount of MgO is slightly larger than in the past, which is slightly porous in the present invention, whereas in the present invention, a dense glass film is formed. In addition, a uniform glass film is covered, and the role of the spacer of the coil during high temperature finish annealing can be sufficiently exhibited. Therefore, it is preferable to set the MgO coating amount to at least 4 g / m 3 .
【００１７】[0017]
【発明の効果】以上のように本発明によれば、脱炭焼鈍
済みの方向性電磁鋼板に、所定のコイル占積率になるよ
うにＭｇＯ塗布量を調整することにより、巻取ったコイ
ルの高温仕上焼鈍で発生する熱歪、すなわち中歪、側歪
の両方を著しく低減できる。従って形状不良による歩留
まり落ちを少なくして生産性を極めて向上できる。As described above, according to the present invention, the decarburized and annealed grain-oriented electrical steel sheet is adjusted to have a predetermined coil space factor by adjusting the amount of MgO applied so that It is possible to remarkably reduce the thermal strain generated by the high temperature finish annealing, that is, both the intermediate strain and the lateral strain. Therefore, the yield loss due to the defective shape can be reduced and the productivity can be extremely improved.
【図１】コイル占積率とＭｇＯ塗布量との関係をを示す
図。FIG. 1 is a diagram showing a relationship between a coil space factor and a MgO coating amount.
【図２】コイルに発生する歪に発生状況を模式的に示す
図。FIG. 2 is a diagram schematically showing a situation in which distortion is generated in a coil.
【図３】実施例１におけるコイル占積率と中歪及び側歪
との関係を示す図。FIG. 3 is a diagram showing a relationship between a coil space factor and a medium strain and a lateral strain in Example 1;
【図４】実施例２におけるコイル占積率と中歪及び側歪
との関係を示す図。FIG. 4 is a diagram showing a relationship between a coil space factor and a medium strain and a lateral strain in Example 2;
Claims (1)
回または中間焼鈍を含む二回以上の冷間圧延で０．２５
mm以下の最終板厚にした鋼板を、脱炭焼鈍後ＭｇＯを主
成分とする焼鈍分離材（以下ＭｇＯという。）を塗布し
てから高温仕上げ焼鈍を施すにあたり、ＭｇＯを塗布し
たコイルが下記式を満足するように前記ＭｇＯ塗布量を
調整することを特徴とする薄物方向性電磁鋼板の製造方
法。 ０．９０≦Ｗ／（Ｖ×ρ）≦０．９２ ただし、Ｗ；ＭｇＯ塗布コイル重量（kg） Ｖ；ＭｇＯ塗布コイル体積（ｍ3 ） ρ；鋼板密度（kg／ｍ3 ）1. The processing of a grain-oriented electrical steel sheet, 0.25 by one or two or more cold rolling including intermediate annealing.
When a steel sheet having a final thickness of less than mm is decarburized and annealed with MgO as a main component (hereinafter referred to as MgO) and then subjected to high-temperature finish annealing, the coil coated with MgO has the following formula. The method of manufacturing a thin-oriented grain-oriented electrical steel sheet, comprising adjusting the MgO coating amount so as to satisfy the above condition. 0.90 ≦ W / (V × ρ) ≦ 0.92 where W: MgO coating coil weight (kg) V: MgO coating coil volume (m 3 ) ρ; Steel plate density (kg / m 3 )
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4188318A JP2703695B2 (en) | 1992-07-15 | 1992-07-15 | Manufacturing method of thin grain oriented electrical steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4188318A JP2703695B2 (en) | 1992-07-15 | 1992-07-15 | Manufacturing method of thin grain oriented electrical steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0633257A true JPH0633257A (en) | 1994-02-08 |
| JP2703695B2 JP2703695B2 (en) | 1998-01-26 |
Family
ID=16221510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4188318A Expired - Lifetime JP2703695B2 (en) | 1992-07-15 | 1992-07-15 | Manufacturing method of thin grain oriented electrical steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2703695B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113801983A (en) * | 2020-06-15 | 2021-12-17 | 宝山钢铁股份有限公司 | Anti-bonding treatment method for thin oriented silicon steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS644427A (en) * | 1987-06-26 | 1989-01-09 | Kawasaki Steel Co | Formation of insulating film on grain oriented silicon steel sheet |
-
1992
- 1992-07-15 JP JP4188318A patent/JP2703695B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS644427A (en) * | 1987-06-26 | 1989-01-09 | Kawasaki Steel Co | Formation of insulating film on grain oriented silicon steel sheet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113801983A (en) * | 2020-06-15 | 2021-12-17 | 宝山钢铁股份有限公司 | Anti-bonding treatment method for thin oriented silicon steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2703695B2 (en) | 1998-01-26 |
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