JPH0238581A - Production of electrical steel sheet with insulating coating film having superior coatability - Google Patents
Production of electrical steel sheet with insulating coating film having superior coatabilityInfo
- Publication number
- JPH0238581A JPH0238581A JP18894788A JP18894788A JPH0238581A JP H0238581 A JPH0238581 A JP H0238581A JP 18894788 A JP18894788 A JP 18894788A JP 18894788 A JP18894788 A JP 18894788A JP H0238581 A JPH0238581 A JP H0238581A
- Authority
- JP
- Japan
- Prior art keywords
- electrical steel
- steel sheet
- insulating coating
- coating
- coating 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.)
- Pending
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 66
- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 description 12
- 239000011162 core material Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 magnesium dichromate-boric acid phosphoric acid Chemical compound 0.000 description 1
- GIOZLVMCHDGNNZ-UHFFFAOYSA-N magnesium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium Chemical compound [Mg+2].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O GIOZLVMCHDGNNZ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
Landscapes
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、モーターやトランスのコア材等として使用さ
れる絶縁皮膜付電磁鋼板（絶縁皮膜の形成された電磁鋼
板、以下同じ）の製法に関し、たとえば打抜き加工され
た絶縁皮膜付電磁鋼板を多数重ね合わせてマイクロモー
ター用のコアーを組立てる様な場合における、端面防錆
用型１′４（後述）の焼付けによる端面塗膜の形成に際
して、ブリスター現象（皮膜が部分的に凸状に膨れる現
象）の発生を防止し、しかも絶縁皮膜自身の密着性も良
好な絶縁皮膜付電磁鋼板の製法に関するものである。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for manufacturing an electrical steel sheet with an insulating coating (electromagnetic steel sheet on which an insulating coating is formed, the same shall apply hereinafter) used as a core material of motors and transformers. For example, in the case where a core for a micromotor is assembled by stacking a large number of punched electrical steel sheets with insulating coatings, when forming a coating film on the end face by baking the end face rust prevention mold 1'4 (described later), the blister The present invention relates to a method for manufacturing an electrical steel sheet with an insulating coating that prevents the occurrence of the phenomenon (a phenomenon in which the coating partially swells into a convex shape) and also has good adhesion to the insulating coating itself.
［従来の技術］
ヘアドライヤーや電気かみそりの如き家電用マイクロモ
ーター等に使用されるコア材としては、渦電流損失を減
少するため表面に絶縁皮膜の形成された電磁鋼板か使用
される。そして絶縁皮膜付電磁鋼板を用いてコアーを製
造するに当たっては、絶縁皮膜付電磁鋼板を適当な幅に
スリットしてから所定形状に打抜き加工し、これを複数
枚重ね合わせてコアーに組立てた後、露出した端面の防
錆と積層物の一体化を兼ねてコア一端面に粉体塗装が行
なわれる。この粉体塗装工程においては、生産性と塗膜
の耐久性を高めるため高温・短時間（２５０〜３５０℃
程度で数秒間）の焼付けが行なわれる。このようなコア
ー材に用いられる電磁鋼板に形成される絶縁皮膜として
は、珪酸塩、燐酸塩、クロム酸塩等の無機質系皮膜、あ
るいはこれらの塩と有機樹脂を併用した有機混合系皮膜
があるか、有機混合系皮膜を使用すると高温焼付は時に
樹脂の分解等によりガスが発生し、粉体塗装時にブリス
ターか発生するので、通常は無機質系皮膜を塗布した電
磁鋼板が使用される。しかしながらこの無機質系皮膜に
ついても、しはしばブリスターが発生し、皮膜不良が問
題となることがあった。[Prior Art] As a core material used in micro motors for home appliances such as hair dryers and electric shavers, electromagnetic steel sheets with an insulating film formed on the surface are used to reduce eddy current loss. When manufacturing a core using an electrical steel sheet with an insulating coating, the electrical steel sheet with an insulating coating is slit to an appropriate width, then punched into a predetermined shape, and after stacking multiple pieces to assemble into a core, One end face of the core is powder coated to prevent rust on the exposed end face and to integrate the laminate. In this powder coating process, high temperatures and short periods of time (250 to 350℃) are used to increase productivity and the durability of the coating film.
(for several seconds). Insulating coatings formed on electrical steel sheets used as core materials include inorganic coatings such as silicates, phosphates, and chromates, or organic mixed coatings using a combination of these salts and organic resins. However, if an organic mixed coating is used, high-temperature baking sometimes generates gas due to decomposition of the resin, and blisters occur during powder coating, so electrical steel sheets coated with an inorganic coating are usually used. However, even with this inorganic coating, blisters often occur and coating defects sometimes become a problem.
［発明が解決しようとする課題］
前述したように従来の絶縁皮膜付電磁鋼板を使用すると
、前述の焼付は工程で当該端面塗膜にブリスターが発生
するが、種々検討した結果、その最大の原因は絶縁皮膜
付電磁鋼板側にあるという結論に到達した。そこで本発
明は、絶縁皮膜付電磁鋼板を用いてコアーを組み立てる
様な場合において、ブリスター等の欠陥のない端面塗膜
を確保し得る様な絶縁皮膜付電磁鋼板を提供しようとす
るものである。[Problems to be Solved by the Invention] As mentioned above, when conventional electrical steel sheets with insulating coatings are used, blistering occurs in the end surface coating during the baking process, but after various studies, we have found that the biggest cause of this is The conclusion was reached that this is on the side of the electrical steel sheet with an insulating coating. SUMMARY OF THE INVENTION Therefore, the present invention aims to provide an electrical steel sheet with an insulating coating that can ensure an end face coating free of defects such as blisters when a core is assembled using the electrical steel sheet with an insulating coating.
［課題を解決するための手段］
上記課題を解決することのできた本発明の構成は、電磁
鋼板に絶縁皮膜を形成するに当たり、電磁鋼板に絶縁皮
膜処理液を塗布した後、２〜５ｔ７秒の速度で鋼板温度
を３５０〜４５０℃まて！Ｊ−温し、その後冷却するこ
とにより、絶縁皮膜の含水率を２重量％以下にするとこ
ろに要旨を有するものである。[Means for Solving the Problems] The configuration of the present invention that has solved the above problems is that when forming an insulation film on an electrical steel sheet, after applying an insulation film treatment liquid to the electrical steel sheet, a treatment time of 2 to 5 tons and 7 seconds is applied. Heat the steel plate to 350-450℃ at high speed! The gist is that the moisture content of the insulating film is reduced to 2% by weight or less by heating and then cooling.
［作用］
本発明者らは、市販の絶縁皮膜付電磁鋼板を用いてコア
ーを組み立てるときにみられる端面皮膜のブリスター発
生現象について種々検討したところ、電磁鋼板表面に形
成される絶縁皮膜中の水分が原因であることを見い出し
た。さらに研究したところ、ブリスター発生率と絶縁皮
膜中の含水率の間に密接な関係があることが明らかにな
ってきた。たとえは第１図は、重クロム酸マグネシウム
−ｇ４酸−硼・酸よりなる３元系の絶縁皮膜が形成され
た電磁鋼板の打抜き加工物を対象とし、エポキシ系の粉
体塗料を端面塗膜（焼付条件：３００℃×１０秒）した
場合における端面塗膜のブリスタ発生率と絶縁皮膜の含
水率の関係を調へた結果を示したものである。この図か
らも明らかである様に、絶縁皮膜の含水率が２重量％を
超えるとブリスターが発生するけれども、含水率が２重
量％未満であるものについては、ブリスターは全く発生
していない。[Function] The present inventors conducted various studies on the phenomenon of blistering of the end face coating that is observed when assembling a core using commercially available electrical steel sheets with an insulating coating, and found that moisture in the insulating coating formed on the surface of the electrical steel sheet. It was discovered that this was the cause. Further research revealed that there is a close relationship between the blister occurrence rate and the moisture content in the insulation film. For example, Figure 1 is a punched workpiece of an electrical steel sheet on which a ternary insulation film consisting of magnesium dichromate, g4 acid, and boron acid is formed, and an epoxy powder coating is applied to the end surface. (Baking conditions: 300° C. x 10 seconds) shows the results of investigating the relationship between the blister generation rate of the edge coating film and the moisture content of the insulating film. As is clear from this figure, blisters occur when the moisture content of the insulation coating exceeds 2% by weight, but no blisters occur when the moisture content is less than 2% by weight.
これらの結果より、ブリスターのない端面塗膜を得るに
は、コア材として使用する絶縁皮膜付電磁鋼板における
絶縁皮膜の含水率を２重量％以下に抑えればよいことが
分かる。こうした傾向が認められる理由は次の様に考え
ることができる。即ち絶縁皮膜の含水率が高い場合は、
端面塗膜形成時の加熱・焼付は工程で絶縁皮膜中の水分
が蒸発して鋼板と端面塗膜の間に侵入し、その蒸気圧に
よって皮膜が押し上げられることによりブリスターが発
生するものと思われる。しかし絶縁皮膜の含水率が２重
量％以下となるまで十分に乾燥しておけは、加熱・焼付
は工程で水分の蒸発が殆んど起こらず、従ってブリスタ
ーが起こらなくなるものと考えられる。From these results, it can be seen that in order to obtain a blister-free end face coating, it is sufficient to suppress the moisture content of the insulating coating to 2% by weight or less in the electrical steel sheet with the insulating coating used as the core material. The reason for this tendency can be considered as follows. In other words, if the moisture content of the insulation film is high,
During the heating and baking process during the formation of the edge coating, moisture in the insulation coating evaporates and enters between the steel plate and the edge coating, and the vapor pressure pushes the coating upward, causing blisters. . However, if the insulating film is sufficiently dried until the moisture content is 2% by weight or less, almost no evaporation of moisture occurs during the heating and baking process, and therefore blistering will not occur.
ところで絶縁皮膜の含水率を２重量％以下にまて低下さ
せるには、絶縁皮膜形成工程で水分か十分に除去される
条件を設定すれはよく、色々な乾燥乃至焼付は法が考え
られる。しかし絶縁皮膜の物性や電磁鋼板に対する密着
性等に悪影響が現われないという条件を満足しつつ、含
水率を２重量％以下にすることができなければならない
。そこで更に研究を進めた結果、電磁鋼板に絶縁皮膜形
成材料を塗布した後、２〜ｂ
温度を３５０〜４５０℃まで昇温した後冷却するという
焼付は条件を設定することによって、上記の目的を達成
し得ることかわかった。By the way, in order to reduce the moisture content of the insulating film to 2% by weight or less, it is best to set conditions such that water is sufficiently removed in the insulating film forming process, and various drying and baking methods can be considered. However, it is necessary to be able to reduce the moisture content to 2% by weight or less while satisfying the condition that the physical properties of the insulating film and the adhesion to the electromagnetic steel sheet are not adversely affected. As a result of further research, we found that the above objective could be achieved by setting baking conditions in which the insulating film-forming material was applied to the electrical steel sheet, the temperature was raised to 350 to 450°C, and then cooled. I knew what I could accomplish.
焼付は時の昇温速度が２℃／秒未満である場合は、絶縁
皮膜の含水率を２重量％以下にまで下げるのに長時間を
要し生産性が低下するばかりでなく、絶縁皮膜か長時間
高温に曝らされることとなり、該皮膜の物性及び密着性
か悪くなる。反対に昇温速度が５℃／秒を超える場合は
、急激な加熱によって絶縁皮膜にクラックが発生し、電
磁鋼板に対する密着性も悪くなる。また焼付は時の最高
到達温度が３５０℃未満である場合は、絶縁皮膜中の水
分か十分に除去されないため端面塗膜のブリスターを無
くずことがてきず、一方４５０℃を超える高温になると
絶縁皮膜か熱劣化を起すと共に密着性も悪くなる。しか
し昇温速度 ２〜ｂ／秒、最高到達温度 ３５０〜４５
０℃という焼付は条件のものでは、絶縁皮膜の物性や密
着性等に悪影響を及ぼずことなく、絶縁皮膜の含水率を
２重量％以下にまで下げることかできる。If the temperature increase rate during baking is less than 2°C/sec, it will take a long time to reduce the moisture content of the insulating film to 2% by weight or less, which will not only reduce productivity but also cause damage to the insulating film. It will be exposed to high temperatures for a long time, and the physical properties and adhesion of the film will deteriorate. On the other hand, if the temperature increase rate exceeds 5° C./sec, cracks will occur in the insulating film due to rapid heating, and the adhesion to the electrical steel sheet will also deteriorate. In addition, if the maximum temperature during baking is less than 350℃, the moisture in the insulation film will not be removed sufficiently, making it impossible to remove the blisters on the edge coating.On the other hand, if the temperature exceeds 450℃, the The film deteriorates due to heat and its adhesion also deteriorates. However, the heating rate is 2-b/sec, the maximum temperature reached is 350-45
Under the baking condition of 0° C., the moisture content of the insulating film can be lowered to 2% by weight or less without adversely affecting the physical properties, adhesion, etc. of the insulating film.
［実施例］
１％のＳ】を含有する板厚０．５ｍｍの電気鉄板を使用
し、これに重クロム酸マグネシウム−燐酸硼酸（１２ｏ
ｇ／ｆｌ： ８０ｇ／ｆｌ： ３０ｇ／ｆ！、）よりな
る絶縁皮膜処理液を、乾燥皮膜か１５〜１．７３／ｍ２
となる様に塗布し、加熱炉にて空気雰囲気下策１表に
示す条件で焼付けを行なって絶縁皮膜付電磁鋼板を得た
。[Example] An electric iron plate with a thickness of 0.5 mm containing 1% S was used, and magnesium dichromate-boric acid phosphoric acid (12O
g/fl: 80g/fl: 30g/f! ,) to form a dry film at a rate of 15 to 1.73/m2.
The coating was applied in such a manner that the coating was applied and baked in a heating furnace in an air atmosphere under the conditions shown in Table 1 to obtain an electrical steel sheet with an insulating coating.
得られた各絶縁皮膜付電磁鋼板における絶縁皮膜の含水
率及び密着性を調べた。また各絶縁皮膜型１＋ｉｌ鋼板
を３０ｍｍｘ３０ｍｍに打抜き加工した後４０枚を重ね
合わせ、端面にエポキシ系（日本油脂社製「コナックＮ
Ｏ，３５００Ｊ）の粉体塗料を付着させて焼イ」け処理
を行ない、得られた端面塗膜におけるブリスター発生状
況を調へた。結果を第１表に併記する。The moisture content and adhesion of the insulation coating in each of the obtained electrical steel sheets with insulation coating were investigated. In addition, after punching each insulating film type 1+IL steel plate into 30 mm x 30 mm, 40 sheets were stacked and the end surfaces were coated with epoxy (conak N
A powder coating of 3,500 J) was applied and baked, and the occurrence of blisters in the resulting end-face coating was investigated. The results are also listed in Table 1.
［絶縁皮膜の含水率］
各条件で乾燥・焼イ」けを行なった後の絶縁皮膜の重量
（１５〜１７ｇ／ｍ２）と、これを３００℃で１２０分
間加熱した後の皮膜重量の差から求めた。[Moisture content of insulation film] Based on the difference between the weight of the insulation film after drying and baking under each condition (15 to 17 g/m2) and the weight of the film after heating it at 300°C for 120 minutes. I asked for it.
［絶縁皮膜の密着性］
各絶縁皮膜付電磁鋼板を５ｍｍ半径にて１８０度曲げを
行ない、皮膜のイ１］離状況を調へた。[Adhesion of Insulating Coating] Each electrical steel sheet with an insulating coating was bent 180 degrees at a radius of 5 mm, and the peeling state of the coating was examined.
○ 剥離なし
△ ｆｌＪ 高Ｉｌ□／ト
×・剥離大
［ブリスター発生率］
打抜き片４０枚を重ね合わせた後、端面にエポキシ系の
粉体塗料（同前）をイ」着せしめ、高周波加熱により３
００℃で１０秒間焼付けを行なった後、得られる端面皮
膜のブリスター発生状況を観察した。○ No peeling △ flJ High Il□/T×・Large peeling [Blister occurrence rate] After stacking 40 punched pieces, the end surfaces were coated with epoxy powder paint (same as above) and coated with high frequency heating. 3
After baking at 00° C. for 10 seconds, the resulting edge coating was observed for blistering.
０・発生なし
△ 少し発生
×・大量に発生
第１表からも明らかである様に、本発明の規定要件を満
たず実施例で得たものはいずれも絶縁皮膜の密着性が良
く、また端面塗膜形成時の焼付けによってもブリスター
は全く生じていない。0 - No occurrence △ A little occurrence × - A large amount of occurrence As is clear from Table 1, all of the products obtained in Examples that did not meet the specified requirements of the present invention had good adhesion of the insulating film, and No blisters were generated at all due to baking during coating film formation.
［発明の効果コ
本発明は以上の様に構成されており、コアーの組立てに
当たり必須とされる端面塗膜形成時の焼付は処理によっ
て当該端面塗膜にブリスター欠陥を生じさせることなく
、しかも絶縁皮膜自体の密着性も良好な絶縁皮膜付鋼板
を製造し得ることになった。[Effects of the Invention] The present invention is constructed as described above, and baking during the formation of the end face coating film, which is essential for assembling the core, can be done without causing any blister defects in the end face coating film, and moreover, it can be insulated. It became possible to produce a steel sheet with an insulating coating that also has good adhesion to the coating itself.
第１図は絶縁皮膜の含水率と端面塗膜のブリスター発生
率の関係を示すグラフである。FIG. 1 is a graph showing the relationship between the moisture content of the insulating film and the blistering rate of the end face coating.
Claims (1)
板に絶縁皮膜処理液を塗布した後、昇温スピード２℃／
秒〜５℃／秒の範囲内で加熱し、鋼板温度が３５０〜４
５０℃に到達した後冷却することにより、絶縁皮膜の含
水率を２重量％以下にすることを特徴とする塗装性に優
れた絶縁皮膜付電磁鋼板の製法。(1) When forming an insulating film on an electrical steel sheet, after applying an insulating film treatment liquid to the electrical steel sheet, the heating rate is 2℃/
Heating within the range of seconds to 5℃/second, the steel plate temperature is 350 to 4
A method for manufacturing an electrical steel sheet with an insulating coating having excellent paintability, characterized in that the moisture content of the insulating coating is reduced to 2% by weight or less by cooling after reaching 50°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18894788A JPH0238581A (en) | 1988-07-28 | 1988-07-28 | Production of electrical steel sheet with insulating coating film having superior coatability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18894788A JPH0238581A (en) | 1988-07-28 | 1988-07-28 | Production of electrical steel sheet with insulating coating film having superior coatability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0238581A true JPH0238581A (en) | 1990-02-07 |
Family
ID=16232700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18894788A Pending JPH0238581A (en) | 1988-07-28 | 1988-07-28 | Production of electrical steel sheet with insulating coating film having superior coatability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0238581A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0499878A (en) * | 1990-08-20 | 1992-03-31 | Nkk Corp | Formation of insulating coating film for electrical steel sheet |
| JP2001279460A (en) * | 2000-03-30 | 2001-10-10 | Kawasaki Steel Corp | Manufacturing method for grain oriented silicon steel sheet extremely low in core loss |
| JP2019137874A (en) * | 2018-02-06 | 2019-08-22 | 日本製鉄株式会社 | Oriented electrical steel sheet and manufacturing method thereof |
| WO2022210962A1 (en) * | 2021-03-31 | 2022-10-06 | 日本製鉄株式会社 | Non-oriented electromagnetic steel sheet and method for manufacturing same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5424233A (en) * | 1977-07-27 | 1979-02-23 | Kawasaki Steel Co | Method of forming insulating film layer on electric steel plate |
| JPS60190572A (en) * | 1984-03-12 | 1985-09-28 | Kawasaki Steel Corp | Formation of insulator covering film superior in punchability and weldability on electrical steel sheet |
-
1988
- 1988-07-28 JP JP18894788A patent/JPH0238581A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5424233A (en) * | 1977-07-27 | 1979-02-23 | Kawasaki Steel Co | Method of forming insulating film layer on electric steel plate |
| JPS60190572A (en) * | 1984-03-12 | 1985-09-28 | Kawasaki Steel Corp | Formation of insulator covering film superior in punchability and weldability on electrical steel sheet |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0499878A (en) * | 1990-08-20 | 1992-03-31 | Nkk Corp | Formation of insulating coating film for electrical steel sheet |
| JP2001279460A (en) * | 2000-03-30 | 2001-10-10 | Kawasaki Steel Corp | Manufacturing method for grain oriented silicon steel sheet extremely low in core loss |
| JP2019137874A (en) * | 2018-02-06 | 2019-08-22 | 日本製鉄株式会社 | Oriented electrical steel sheet and manufacturing method thereof |
| WO2022210962A1 (en) * | 2021-03-31 | 2022-10-06 | 日本製鉄株式会社 | Non-oriented electromagnetic steel sheet and method for manufacturing same |
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