JPH0978253A - Formation of insulating film on grain-oriented silicon steel sheet - Google Patents
Formation of insulating film on grain-oriented silicon steel sheetInfo
- Publication number
- JPH0978253A JPH0978253A JP7235014A JP23501495A JPH0978253A JP H0978253 A JPH0978253 A JP H0978253A JP 7235014 A JP7235014 A JP 7235014A JP 23501495 A JP23501495 A JP 23501495A JP H0978253 A JPH0978253 A JP H0978253A
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- Japan
- Prior art keywords
- steel sheet
- insulating film
- atmosphere
- silicon steel
- film
- 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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- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はフォルステライト
（Ｍｇ2 ＳｉＯ4 ）等の無機鉱物質皮膜の生成を意図的
に防止して製造した仕上げ焼鈍済みの一方向性珪素鋼板
や、フォルステライト等の無機鉱物質皮膜を酸洗等の手
段で除去したり、さらには鏡面ないしはそれに近い状態
に調製した仕上げ焼鈍済みの一方向性珪素鋼板に対し、
良好な鉄損を得ることができるよう張力付与型の絶縁性
皮膜を形成する方法に関するものである。TECHNICAL FIELD The present invention relates to a finish-annealed unidirectional silicon steel sheet manufactured by intentionally preventing the formation of an inorganic mineral film such as forsterite (Mg 2 SiO 4 ) and forsterite. The inorganic mineral film is removed by means such as pickling, and further, for finish-annealed unidirectional silicon steel sheets prepared to a mirror surface or a state close to it,
The present invention relates to a method for forming a tension-imparting insulating film so that good iron loss can be obtained.
【０００２】[0002]
【従来の技術】一方向性珪素鋼板は磁気鉄芯材料として
多用されており、特にエネルギーロスを少なくするため
に鉄損の少ない材料が求められている。この鉄損の低減
には鋼板に張力を付与することが有効であることから、
鋼板に比べ熱膨張係数の小さい材質からなる皮膜を高温
で形成することによって鋼板に張力を付与し、鉄損低減
が図られてきた。仕上げ焼鈍工程で鋼板表面の酸化物と
焼鈍分離剤とが反応して生成するフォルステライト系皮
膜は、鋼板に張力を与えることができ、皮膜密着性も優
れている。2. Description of the Related Art A grain-oriented silicon steel sheet is widely used as a magnetic iron core material. In particular, a material having a small iron loss is required to reduce energy loss. Since it is effective to apply tension to the steel sheet to reduce the iron loss,
By forming a film made of a material having a smaller coefficient of thermal expansion than a steel sheet at high temperature, tension is applied to the steel sheet to reduce iron loss. The forsterite-based coating formed by the reaction between the oxide on the steel sheet surface and the annealing separator in the finish annealing step can give tension to the steel sheet and has excellent coating adhesion.
【０００３】さらに、特開昭４８−３９３３８号公報で
開示されたコロイド状シリカとリン酸塩を主体とするコ
ーティング液を焼き付けることによって絶縁皮膜を形成
する方法は、鋼板に対する張力付与の効果が大きく、鉄
損低減に有効である。したがって、仕上げ焼鈍工程で生
じたフォルステライト系皮膜を残した上で、リン酸塩を
主体とする絶縁皮膜を形成することが一般的な一方向性
珪素鋼板の製造方法となっている。Further, the method of forming an insulating film by baking a coating solution containing colloidal silica and phosphate as disclosed in JP-A-48-39338 has a great effect of applying tension to a steel sheet. It is effective in reducing iron loss. Therefore, a general method for producing a unidirectional silicon steel sheet is to leave the forsterite film formed in the finish annealing step and then form the insulating film mainly containing phosphate.
【０００４】一方、近年、フォルステライト系皮膜と地
鉄の乱れた界面構造が、鉄損に対する皮膜張力効果をあ
る程度減少させていることが明らかになってきた。そこ
で、例えば、特開昭４９−９６９２０号公報に開示され
ている如く、仕上げ焼鈍工程で生ずるフォルステライト
系皮膜を除去したり、さらに鏡面化仕上げを行った後、
改めて張力皮膜を形成させることにより、さらなる鉄損
低減を試みる技術が開発された。On the other hand, in recent years, it has become clear that the disordered interfacial structure between the forsterite coating and the base iron reduces the coating tension effect on iron loss to some extent. Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 49-96920, after removing the forsterite film generated in the finish annealing step or further performing mirror finishing,
A technology has been developed that attempts to further reduce iron loss by forming a tension film again.
【０００５】しかしながら、上記絶縁皮膜はフォルステ
ライトを主体とする皮膜の上に形成した場合は、かなり
の皮膜密着性が得られるものの、フォルステライト系皮
膜を除去したり、あるいは仕上げ焼鈍工程で意図的にフ
ォルステライト形成を行わなかったものに対しては皮膜
密着性が十分ではない。However, when the above-mentioned insulating film is formed on a film mainly composed of forsterite, although a considerable film adhesion can be obtained, the forsterite film is removed or it is intentionally used in the finish annealing process. In addition, the film adhesion is not sufficient for those for which forsterite formation was not performed.
【０００６】フォルステライト系皮膜の除去を行った場
合は、コーティング液を塗布して形成させる張力付与型
絶縁皮膜のみで所要の皮膜張力を確保する必要があり、
必然的に厚膜化しなければならず、より一層の密着性が
必要である。When the forsterite-based film is removed, it is necessary to secure the required film tension only with the tension-imparting insulating film formed by applying the coating liquid.
Inevitably, the film thickness must be increased, and even higher adhesion is required.
【０００７】したがって、従来の皮膜形成法では鏡面化
の効果を十分に引き出すほどの皮膜張力を達成すること
は困難であり、十分な鉄損低減が図られていなかった。
そこで、特開平５−２８７５４６号公報において、鋼板
表面にフォルステライト系皮膜のない一方向性珪素鋼板
に対し、リン酸塩とコロイド状シリカを主成分とするコ
ーティング液の塗布、焼き付けを行う際の雰囲気に水素
を含有させ、張力付与型の絶縁皮膜を形成させる方法が
開示された。Therefore, it is difficult for the conventional film forming method to achieve a film tension enough to bring out the effect of the mirror finish, and the iron loss has not been sufficiently reduced.
Therefore, in Japanese Unexamined Patent Publication (Kokai) No. 5-287546, when a coating solution containing phosphate and colloidal silica as a main component is applied to and baked on a unidirectional silicon steel sheet having no forsterite coating on the surface of the steel sheet. A method has been disclosed in which hydrogen is contained in the atmosphere to form a tension-imparting insulating film.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、特開平
５−２８７５４６号公報において開示された技術につい
ては次に述べるような問題点があった。該公報には絶縁
皮膜の焼き付けを行う雰囲気中に水素を含有させること
によって、皮膜密着性が確保できることが述べられてい
る。この方法によって皮膜密着性はそれなりに改善され
る。しかしながら、焼き付け雰囲気中の水素分圧を制御
しただけでは安定した鉄損低減効果が得られないという
問題点があった。However, the technique disclosed in Japanese Patent Laid-Open No. 5-287546 has the following problems. The publication describes that film adhesion can be secured by containing hydrogen in the atmosphere in which the insulating film is baked. By this method, the film adhesion is improved to some extent. However, there is a problem that a stable iron loss reducing effect cannot be obtained only by controlling the hydrogen partial pressure in the baking atmosphere.
【０００９】[0009]
【課題を解決するための手段】本発明は上述の問題点を
解決し、無機鉱物質皮膜のない仕上げ焼鈍済みの一方向
性珪素鋼板に対し、良好な鉄損を得ることができるよう
に張力付与型の絶縁性皮膜を形成させる方法である。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and makes it possible to obtain a good iron loss for a finish annealed unidirectional silicon steel sheet without an inorganic mineral film. It is a method of forming an imparting type insulating film.
【００１０】本発明の要旨は次の通りである。 （１）鋼板表面に無機鉱物質皮膜のない仕上げ焼鈍済み
一方向性珪素鋼板にコーティング液を塗布し、焼き付け
ることによって非晶質主体の張力付与型絶縁皮膜を形成
する方法において、コーティング液の焼き付けを行う雰
囲気のＰ H2 O／Ｐ H2 （Ｐ H2 O ，Ｐ H2 はそれぞれ
雰囲気中の水蒸気分圧と水素分圧）を１０-2以上として
鋼板と張力付与型絶縁皮膜との間に生ずる界面荒れを防
止することを特徴とする一方向性珪素鋼板の絶縁皮膜形
成方法。 （２）張力付与型の絶縁皮膜を形成させるコーティング
液がリン酸塩とコロイド状シリカを主体とすることを特
徴とする（１）に記載の一方向性珪素鋼板の絶縁皮膜形
成方法。The gist of the present invention is as follows. (1) In a method of applying a coating solution to a finish-annealed unidirectional silicon steel sheet having no inorganic mineral film on the surface of a steel sheet and baking the coating solution to form a tension-applying insulating coating mainly composed of an amorphous material, the coating solution is baked. P H 2 O / P H 2 atmosphere to perform between the (P H 2 O, P H 2 are each steam partial pressure and hydrogen partial pressure in the atmosphere) steel sheet and the tension-imparting insulating coating as 10 -2 A method for forming an insulating coating on a unidirectional silicon steel sheet, characterized in that the interface roughness generated in the surface of the sheet is prevented. (2) The method for forming an insulating film on a unidirectional silicon steel sheet according to (1), wherein the coating liquid for forming the tension-imparting insulating film is mainly composed of phosphate and colloidal silica.
【００１１】以下、発明の詳細について説明する。発明
者らは鉄損値に対し、雰囲気中の水素分圧（Ｐ H2 ）だ
けでなく水蒸気分圧（Ｐ H2 O)も影響するのではないか
と予想した。そこで、次のような手順で検討を行い、鉄
損値に対する焼き付け雰囲気（Ｐ H2 O ／Ｐ H2 ）の影
響を調べた。まず、仕上げ焼鈍済みの一方向性珪素鋼板
の表面に生成しているフォルステライト系皮膜を酸洗に
よって除去し、さらに化学研磨を施すことによって表面
を鏡面化した。The details of the invention will be described below. The inventors expected that not only the hydrogen partial pressure (P H 2 ) in the atmosphere but also the steam partial pressure (P H 2 O) would affect the iron loss value. Therefore, the following procedure was used to examine the effect of the baking atmosphere (PH 2 O / PH 2 ) on the iron loss value. First, the forsterite coating formed on the surface of the finish-annealed unidirectional silicon steel sheet was removed by pickling, and chemical polishing was performed to make the surface mirror-finished.
【００１２】次に、この鋼板に対し、リン酸アルミニウ
ムとコロイド状シリカを主成分とするコーティング液を
塗布し、８５０℃で１２０秒間焼き付けし、非晶質の張
力付与型絶縁皮膜を形成させた。この焼き付けの際、雰
囲気中のＰ H2 O とＰ H2 の両方を調整した。最後に、
皮膜付き試料の鉄損値を測定した。Next, a coating liquid containing aluminum phosphate and colloidal silica as a main component was applied to this steel sheet and baked at 850 ° C. for 120 seconds to form an amorphous tension imparting insulating film. . During this baking was adjusted both P H 2 O and P H 2 in the atmosphere. Finally,
The iron loss value of the film-coated sample was measured.
【００１３】結果をまとめたものが図１である。図１か
ら低い鉄損値を得るためには焼き付け雰囲気のＰ H2 O
／Ｐ H2 を１０-2以上にした時、低い（優れた）鉄損値
を得ることができることがわかる。FIG. 1 is a summary of the results. In order to obtain a low iron loss value from Fig. 1, P H 2 O in the baking atmosphere
It can be seen that a low (excellent) iron loss value can be obtained when / P H 2 is set to 10 −2 or more.
【００１４】なお、鉄損値の測定はレーザー照射法によ
る磁区制御処理を施し、かつ磁束密度（一般にＢ8 で代
表される）が１．９３テスラ前後の試料について行っ
た。一般に、一方向性珪素鋼板の鉄損値は試料の磁区の
大きさと磁束密度の影響を受ける。そのため、磁区制御
を施し磁区の大きさが等しく、かつ磁束密度についても
ほぼ同じ値の試料について鉄損値を測定し比較した。こ
れによって鉄損値に対する焼き付け雰囲気のＰ H2 O ／
Ｐ H2 の影響のみを抽出できる。The measurement of the iron loss value was carried out on a sample having a magnetic domain control treatment by a laser irradiation method and a magnetic flux density (generally represented by B 8 ) of about 1.93 tesla. Generally, the iron loss value of a unidirectional silicon steel sheet is affected by the size of magnetic domains and magnetic flux density of the sample. Therefore, the magnetic domain control was performed, and the iron loss values were measured and compared for samples having the same magnetic domain size and almost the same magnetic flux density. As a result, P H 2 O /
Only the effect of P H 2 can be extracted.
【００１５】[0015]
【発明の実施の形態】本発明における張力付与型の絶縁
皮膜はその大部分が非晶質である。発明者らは皮膜の非
晶質状態に対して焼き付け雰囲気のＰ H2 O ／Ｐ H2 が
次のように作用するのではないかと推測している。Ｐ H
2 O ／Ｐ H2 が１０-2以上の雰囲気で焼き付けた場合、
皮膜は非晶質状態のまま一様に鋼板を被覆している。BEST MODE FOR CARRYING OUT THE INVENTION Most of the tension imparting type insulating film of the present invention is amorphous. The inventors have speculated that the baking atmosphere of P H 2 O / P H 2 may act on the amorphous state of the film as follows. P H
When baked in an atmosphere of 2 O / P H 2 of 10 -2 or more,
The film uniformly covers the steel sheet in an amorphous state.
【００１６】ところが、Ｐ H2 O ／Ｐ H2 が１０-2未満
の雰囲気で焼き付けた場合、皮膜の一部が結晶化し微小
なクラックが入る。一旦、皮膜に微小なクラックが入る
とこのクラックを介して鋼板表面が雰囲気の影響を受
け、その結果ある種の界面荒れが発生し、良好な鉄損値
が得られないものと推測している。However, when baked in an atmosphere in which P H 2 O / P H 2 is less than 10 -2 , a part of the film is crystallized and minute cracks are formed. It is speculated that once a minute crack enters the coating, the steel plate surface is affected by the atmosphere through this crack, and as a result, some kind of interface roughness occurs and a good iron loss value cannot be obtained. .
【００１７】[0017]
【実施例】Ｓｉを３．２５％含有する最終板厚０．２３
mmに冷間圧延された珪素鋼板に対し、脱炭焼鈍を行っ
た。この時、鋼板表面にはＳｉＯ2 を含む酸化層が形成
される。ついで、この鋼板に対し、ＭｇＯを主体とする
焼鈍分離剤を塗布し、最終仕上げ焼鈍を行った。このよ
うにして焼鈍した一方向性珪素鋼板表面にはフォルステ
ライトを主体とする皮膜が存在している。[Example] Final thickness 0.23 containing 3.25% Si
Decarburization annealing was performed on the silicon steel sheet cold-rolled to mm. At this time, an oxide layer containing SiO 2 is formed on the surface of the steel sheet. Then, an annealing separator mainly composed of MgO was applied to this steel sheet, and final finish annealing was performed. A coating mainly composed of forsterite exists on the surface of the annealed silicon steel sheet thus annealed.
【００１８】このフォルステライト系皮膜付きの鋼板を
硫酸とフッ化アンモニウムの水溶液に浸漬することによ
りフォルステライト系皮膜を除去し、さらにフッ酸と過
酸化水素の混合水溶液中で化学研磨し表面を鏡面状態に
仕上げた。The forsterite-based film is removed by immersing the steel plate with the forsterite-based film in an aqueous solution of sulfuric acid and ammonium fluoride, and further chemically polished in a mixed aqueous solution of hydrofluoric acid and hydrogen peroxide to give a mirror-finished surface. I finished it.
【００１９】次に、この鋼板表面に濃度２０％のコロイ
ド状シリカの懸濁液１００ml、濃度５０％のリン酸アル
ミニウム溶液１００ml、無水クロム酸５ｇからなるコー
ティング液を溝付きロールによって片面当たり９ｇ／ｍ
2 塗布し、水素５％、窒素９５％、露点−２０℃でＰ H
2 O ／Ｐ H2 が２．５×１０-2の雰囲気と水素７５％、
窒素２５％、露点−２０℃でＰ H2 O ／Ｐ H2 が０．２
×１０-2の雰囲気で８５０℃、１２０秒間焼き付け、リ
ン酸アルミニウムを主体とする皮膜を形成させた。最後
にレーザー照射法による磁区制御を施し、鉄損を測定し
た。Next, a coating liquid consisting of 100 ml of a suspension of colloidal silica having a concentration of 20%, 100 ml of an aluminum phosphate solution having a concentration of 50%, and 5 g of chromic anhydride was applied to the surface of the steel sheet by a grooved roll at 9 g / side. m
2 coating, hydrogen 5%, nitrogen 95%, dew point -20 ℃ PH
2 O / P H 2 atmosphere of 2.5 × 10 -2 and hydrogen 75%,
Nitrogen 25%, dew point -20 ° C, PH 2 O / PH 2 is 0.2
It was baked at 850 ° C. for 120 seconds in an atmosphere of × 10 −2 to form a film mainly composed of aluminum phosphate. Finally, magnetic domain control was performed by the laser irradiation method, and the iron loss was measured.
【００２０】結果を表１に示す。焼き付け雰囲気のＰ H
2 O ／Ｐ H2 が０．２×１０-2である比較例に比べ、焼
き付け雰囲気のＰ H2 O ／Ｐ H2 が２．５×１０-2であ
る本発明の方が鉄損値が低く優れている。本発明の一例
について説明したが、勿論本発明はかかる実施例に限定
されない。The results are shown in Table 1. PH of baking atmosphere
Compared with the comparative example in which 2 O / P H 2 is 0.2 × 10 -2 , the iron loss value of the present invention in which PH 2 O / P H 2 in the baking atmosphere is 2.5 × 10 -2 Is low and excellent. Although an example of the present invention has been described, the present invention is of course not limited to such an embodiment.
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【発明の効果】本発明によって界面荒れを起こさず、非
晶質の張力付与型絶縁皮膜を形成できるので、低い（優
れた）鉄損値を得ることができる。According to the present invention, since an amorphous tension-imparting insulating film can be formed without causing interface roughening, a low (excellent) iron loss value can be obtained.
【図１】鉄損値に及ぼす張力付与型絶縁皮膜を焼き付け
る時の雰囲気のＰ H2 O ／Ｐ H2 の影響を示す図表であ
る。FIG. 1 is a table showing the effect of P H 2 O / P H 2 in the atmosphere when a tension-giving insulating film is baked on the iron loss value.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 牛神 義行 富津市新富20−１ 新日本製鐵株式会社技 術開発本部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Ushigami 20-1 Shintomi, Futtsu City Nippon Steel Corporation Technical Development Division
Claims (2)
焼鈍済み一方向性珪素鋼板にコーティング液を塗布し、
焼き付けることによって非晶質主体の張力付与型絶縁皮
膜を形成する方法において、コーティング液の焼き付け
を行う雰囲気のＰ H2 O ／Ｐ H2 （Ｐ H2 O ，Ｐ H2 は
それぞれ雰囲気中の水蒸気分圧と水素分圧）を１０-2以
上として鋼板と張力付与型絶縁皮膜との間に生ずる界面
荒れを防止することを特徴とする一方向性珪素鋼板の絶
縁皮膜形成方法。1. A coating solution is applied to a finish-annealed unidirectional silicon steel sheet having no inorganic mineral film on the surface of the steel sheet,
Steam in a method of forming a tension-imparting insulating coating of amorphous metallic, P H 2 O / P H 2 (P H 2 O in atmosphere in which the baking of the coating liquid, P H 2, respectively atmosphere by baking Partial pressure and hydrogen partial pressure) is 10 -2 or more to prevent interfacial roughness between the steel sheet and the tension-imparting insulating coating film.
ティング液がリン酸塩とコロイド状シリカを主体とする
ことを特徴とする請求項１に記載の一方向性珪素鋼板の
絶縁皮膜形成方法。2. The method for forming an insulating film on a unidirectional silicon steel sheet according to claim 1, wherein the coating liquid for forming the tension-imparting insulating film is mainly composed of phosphate and colloidal silica.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23501495A JP3272210B2 (en) | 1995-09-13 | 1995-09-13 | Method for forming insulating film on unidirectional silicon steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23501495A JP3272210B2 (en) | 1995-09-13 | 1995-09-13 | Method for forming insulating film on unidirectional silicon steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0978253A true JPH0978253A (en) | 1997-03-25 |
| JP3272210B2 JP3272210B2 (en) | 2002-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23501495A Ceased JP3272210B2 (en) | 1995-09-13 | 1995-09-13 | Method for forming insulating film on unidirectional silicon steel sheet |
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| Country | Link |
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| JP (1) | JP3272210B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003057929A1 (en) * | 2002-01-08 | 2003-07-17 | Nippon Steel Corporation | Method for producing grain-oriented silicon steel plate with mirror surface |
| WO2020149319A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Grain-oriented electrical steel sheet and method for manufacturing same |
| WO2020149330A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Method for manufacturing grain-oriented electromagnetic steel sheet |
| CN111684106A (en) * | 2018-02-06 | 2020-09-18 | 杰富意钢铁株式会社 | Electromagnetic steel sheet with insulating coating and method for producing same |
| WO2021084793A1 (en) | 2019-10-31 | 2021-05-06 | Ｊｆｅスチール株式会社 | Electromagnetic steel sheet with insulation coating film |
| WO2023204267A1 (en) * | 2022-04-21 | 2023-10-26 | 日本製鉄株式会社 | Grain-oriented electromagnetic steel sheet and production method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05287546A (en) * | 1992-04-07 | 1993-11-02 | Nippon Steel Corp | Formation of insulating coating film of unidirectional silicon steel sheet |
| JPH05311353A (en) * | 1992-05-08 | 1993-11-22 | Nippon Steel Corp | Ultralow core loss grain-oriented silicon steel sheet without glass coating film and its production |
| JPH06184762A (en) * | 1992-08-25 | 1994-07-05 | Nippon Steel Corp | Formation of insulated film on grain-oriented silicon steel sheet |
-
1995
- 1995-09-13 JP JP23501495A patent/JP3272210B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05287546A (en) * | 1992-04-07 | 1993-11-02 | Nippon Steel Corp | Formation of insulating coating film of unidirectional silicon steel sheet |
| JPH05311353A (en) * | 1992-05-08 | 1993-11-22 | Nippon Steel Corp | Ultralow core loss grain-oriented silicon steel sheet without glass coating film and its production |
| JPH06184762A (en) * | 1992-08-25 | 1994-07-05 | Nippon Steel Corp | Formation of insulated film on grain-oriented silicon steel sheet |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336916C (en) * | 2002-01-08 | 2007-09-12 | 新日本制铁株式会社 | Method for producing grain-oriented silicon steel plate with mirror surface |
| US7364629B2 (en) | 2002-01-08 | 2008-04-29 | Nippon Steel Corporation | Method for manufacturing grain-oriented silicon steel sheets with mirror-like surface |
| WO2003057929A1 (en) * | 2002-01-08 | 2003-07-17 | Nippon Steel Corporation | Method for producing grain-oriented silicon steel plate with mirror surface |
| EP3722460A4 (en) * | 2018-02-06 | 2020-11-11 | JFE Steel Corporation | Electromagnetic steel sheet with insulating coating and production method therefor |
| US11923115B2 (en) | 2018-02-06 | 2024-03-05 | Jfe Steel Corporation | Insulating coating-attached electrical steel sheet and manufacturing method therefor |
| CN111684106A (en) * | 2018-02-06 | 2020-09-18 | 杰富意钢铁株式会社 | Electromagnetic steel sheet with insulating coating and method for producing same |
| WO2020149319A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Grain-oriented electrical steel sheet and method for manufacturing same |
| CN113366123A (en) * | 2019-01-16 | 2021-09-07 | 日本制铁株式会社 | Method for producing grain-oriented electromagnetic steel sheet |
| JPWO2020149319A1 (en) * | 2019-01-16 | 2021-11-25 | 日本製鉄株式会社 | Directional electromagnetic steel plate and its manufacturing method |
| JPWO2020149330A1 (en) * | 2019-01-16 | 2021-12-02 | 日本製鉄株式会社 | Manufacturing method of grain-oriented electrical steel sheet |
| WO2020149330A1 (en) * | 2019-01-16 | 2020-07-23 | 日本製鉄株式会社 | Method for manufacturing grain-oriented electromagnetic steel sheet |
| WO2021084793A1 (en) | 2019-10-31 | 2021-05-06 | Ｊｆｅスチール株式会社 | Electromagnetic steel sheet with insulation coating film |
| WO2023204267A1 (en) * | 2022-04-21 | 2023-10-26 | 日本製鉄株式会社 | Grain-oriented electromagnetic steel sheet and production method therefor |
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|---|---|
| JP3272210B2 (en) | 2002-04-08 |
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