JPH02125883A - Method for drying magnesia for separation agent at annealing - Google Patents
Method for drying magnesia for separation agent at annealingInfo
- Publication number
- JPH02125883A JPH02125883A JP27809788A JP27809788A JPH02125883A JP H02125883 A JPH02125883 A JP H02125883A JP 27809788 A JP27809788 A JP 27809788A JP 27809788 A JP27809788 A JP 27809788A JP H02125883 A JPH02125883 A JP H02125883A
- Authority
- JP
- Japan
- Prior art keywords
- annealing
- magnesia
- temp
- grain
- forsterite 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
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000000137 annealing Methods 0.000 title claims abstract description 41
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 5
- 238000001035 drying Methods 0.000 title claims description 9
- 238000000926 separation method Methods 0.000 title abstract description 4
- 229910052839 forsterite Inorganic materials 0.000 claims abstract description 24
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000036571 hydration Effects 0.000 abstract description 7
- 238000006703 hydration reaction Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 238000005121 nitriding Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010016803 Fluid overload Diseases 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 description 1
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 1
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- MGIUUAHJVPPFEV-ABXDCCGRSA-N magainin ii Chemical compound C([C@H](NC(=O)[C@H](CCCCN)NC(=O)CNC(=O)[C@@H](NC(=O)CN)[C@@H](C)CC)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](C(C)C)C(=O)NCC(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CO)C(O)=O)C1=CC=CC=C1 MGIUUAHJVPPFEV-ABXDCCGRSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004804 winding Methods 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〕
本発明は、方向性電磁鋼板の仕上げ焼鈍に際して、板間
の焼付きを防止し、フォルステライト被膜を形成するた
めに鋼板表面に塗布される焼鈍分離剤の主成分として使
用されるマグ不ソアの乾燥方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of applying a forsterite film to the surface of a grain-oriented electrical steel sheet in order to prevent seizure between the sheets and form a forsterite film during final annealing of the grain-oriented electrical steel sheet. The present invention relates to a method for drying mag unsoar used as a main component of an annealing separator.
方向性電磁鋼板は、熱延鋼板をたとえば焼鈍冷延、脱炭
した後、コイル状に巻き取り、仕上げ焼鈍している。こ
のとき、仕上げ焼鈍時の高温により板間に焼付きが生じ
ることを防止するため、鋼板の表面にマグ２、シア系を
主成分とする焼鈍分離剤が塗布されている。この焼鈍分
離剤は、鋼板表面に生成している５１０２系のサブスケ
ールと反応して、絶縁被膜として有効なフォルステライ
ト（Ｍｇａ ｓ ： ０１＞を生成する役割をももつ。A grain-oriented electrical steel sheet is obtained by subjecting a hot rolled steel sheet to, for example, annealing, cold rolling, decarburization, winding into a coil, and final annealing. At this time, in order to prevent seizure between the plates due to the high temperature during finish annealing, the surface of the steel plate is coated with MAG 2, an annealing separator whose main component is a shear type. This annealing separator also has the role of reacting with the 5102 series subscale produced on the surface of the steel sheet to produce forsterite (Mgas: 01>), which is effective as an insulating film.
この焼鈍分離剤は、マク不ンアと各種添加物とをスラリ
ー状に調整し、湿式で鋼板の表面に塗布している。その
ため、仕上げ焼鈍時の昇温過程で水和したマグネシアか
ら水分が放出される。この放出された水分は、鋼板の酸
化を促進させ、また鋼板表面に形成されるフォルステラ
イト被膜にバラツキを発生させる原因にもなる。特に、
雰囲気ガスから窒素を鋼板に吸収させ、窒化物系のイン
ヒビターを形成させる方向性電磁鋼板の製造方法にあっ
ては、放出水分により窒素の吸収が阻害され、二次再結
晶が不良となる。This annealing separator is prepared by preparing a slurry of Macunure and various additives, and wet-applying the slurry to the surface of the steel sheet. Therefore, water is released from hydrated magnesia during the temperature rising process during final annealing. This released moisture promotes oxidation of the steel sheet and also causes variations in the forsterite film formed on the surface of the steel sheet. especially,
In a method for manufacturing a grain-oriented electrical steel sheet in which nitrogen is absorbed from an atmospheric gas into the steel sheet to form a nitride-based inhibitor, the released moisture inhibits the absorption of nitrogen, resulting in poor secondary recrystallization.
そこで、放出水分の影響を無くすた必、高温で焼成し水
和水の少ないマグネノアを主成分とする焼鈍分離剤を使
用することが特開昭５３−１５２０５号公報、特開昭５
９−９６２７８号公報等で提案されている。Therefore, in order to eliminate the influence of released water, it is necessary to use an annealing separator mainly composed of Magnenoa, which is fired at high temperature and has little hydration water, as disclosed in JP-A-53-15205 and JP-A-5.
This method has been proposed in Japanese Patent No. 9-96278 and the like.
高温焼成されたマグネシアを使用するとき、水分放出に
起因する欠陥をある程度抑制することができる。しかし
、この焼鈍分離剤を方向性電磁鋼板に塗布する際には、
鋼板に対する付着性、塗布の一様化等のために、焼鈍分
離剤を一旦水と混合し、スラリー状にする。そのため、
水分の持込みを避は難く、前述の問題を解決するに至っ
ていないのが実情である。When using high-temperature fired magnesia, defects caused by moisture release can be suppressed to some extent. However, when applying this annealing separator to grain-oriented electrical steel sheets,
In order to improve adhesion to the steel plate and ensure uniform application, an annealing separator is mixed with water to form a slurry. Therefore,
The reality is that it is difficult to avoid moisture being brought in, and the above-mentioned problem has not yet been solved.
そこで、本発明は、かかる問題を解決するものであって
、仕上げ焼鈍時の昇温過程における水分の放出を抑制し
、しかもフォルステライト被膜形成時にはＭｇＯ＆Ｓｉ
Ｏ２との反応遂行に必要な水分を放出することができる
焼鈍分離剤を得ることを目的とする。Therefore, the present invention solves this problem by suppressing the release of moisture during the temperature rising process during final annealing, and in addition, when forming a forsterite film, MgO & Si
The object is to obtain an annealing separator capable of releasing the moisture necessary for carrying out the reaction with O2.
本発明の乾燥方法は、その目的を達成するために、水和
水分を含有するマグネシアを、フォルステライト被膜形
成温度域で予備乾燥させることを特徴とする。In order to achieve the object, the drying method of the present invention is characterized in that magnesia containing hydrated water is pre-dried in a forsterite film forming temperature range.
マグネシアの水和水分量は、第１図に示すように高温に
なるほど低下する。そのため、従来のようにマグネシア
をスラリー状にして塗布した鋼板を加熱するとき、フォ
ルステライト被膜形成開始温度（たとえば約９５０℃）
以前の段階で水和水分が焼鈍分離剤から放出される。こ
の水分が、コイルの板間に滞留し、前述したように鋼板
を過度に酸化させる原因となる。また、雰囲気ガスの窒
素分圧を下げ、板幅方向に窒素吸収量を変動させること
にもなる。As shown in FIG. 1, the hydrated water content of magnesia decreases as the temperature increases. Therefore, when heating a steel plate coated with magnesia in the form of slurry as in the past, the forsterite film formation starting temperature (for example, about 950°C)
Hydration water is released from the annealing separator in a previous step. This moisture accumulates between the plates of the coil, causing excessive oxidation of the steel plate as described above. Moreover, the nitrogen partial pressure of the atmospheric gas is lowered, and the amount of nitrogen absorption is varied in the width direction of the plate.
そこで、本発明においては、マグネシアをフォルステラ
イト被膜形成温度域で予め加熱乾燥させる。この処理に
よって、焼鈍分離剤を静電塗布した鋼板を仕上げ焼鈍す
るとき、予備乾燥温度に至るまで、焼鈍分離剤から水分
が放出することがなくなる。そのため、雰囲気ガスが放
出水分による悪影響を受けることなく、コイルの昇温が
行われる。Therefore, in the present invention, magnesia is previously heated and dried in the forsterite film forming temperature range. This treatment prevents moisture from being released from the annealing separator until the pre-drying temperature is reached when finishing annealing a steel plate to which the annealing separator has been electrostatically applied. Therefore, the temperature of the coil can be increased without the atmospheric gas being adversely affected by the released moisture.
また、焼鈍分離剤が予備乾燥温度を超えて昇温するとき
、残余の水和水がマグネシアから分離して放出される。Also, when the annealing separator is heated above the pre-drying temperature, residual water of hydration is separated from the magnesia and released.
この放出水より生成するＯＨ基がＭｇＯ粒子の表面に吸
着され、陽イオン空位が形成され、またこれが離脱する
と陰イオン空位を生じるが、このような空位濃度の増大
によって拡散が促進され、焼結反応が促進され進行し、
フォルステライト被膜が形成される。すなわち、予備乾
燥されたマグネシアを主成分とする焼鈍分離剤では、過
酸化や窒化反応抑制を生じるような水和水分がなく、一
方、フォルステライト被膜形成に必要な永和分が確保さ
れている。The OH groups generated from this released water are adsorbed on the surface of the MgO particles, forming cation vacancies, and when they are released, anion vacancies are created, but this increase in vacancy concentration promotes diffusion, leading to sintering. The reaction is accelerated and progresses,
A forsterite film is formed. That is, the annealing separation agent containing predried magnesia as a main component does not contain hydration water that would inhibit peroxidation or nitriding reactions, and on the other hand, maintains the permanent content necessary for forming a forsterite film.
このようにして、本発明に従って乾燥されたマグネシア
を主成分とする焼鈍分離剤は、仕」−げ焼鈍時における
鋼板の昇温過程のフォルステライト被膜形成開始まで水
分を放出するこさなく、被膜形成過程では必要な水分を
放出する。その結果、酸化、窒化不良等の欠陥を発生さ
せることなく、優れた品質のフォルステライト被膜が形
成され、磁性的にも安定した方向性電磁鋼板が得られる
。In this way, the annealing separator mainly composed of magnesia dried according to the present invention can form a film without releasing moisture until the formation of a forsterite film during the heating process of the steel sheet during finish annealing. In the process, necessary water is released. As a result, a forsterite coating of excellent quality is formed without defects such as oxidation and nitridation defects, and a grain-oriented electrical steel sheet that is magnetically stable is obtained.
この焼鈍分離剤は、非水和のマグネシアと併用すること
ができる。非水和のマグネシアは、水和水分が皆無とい
われるほどであるので、水和水の持込みが無く、過酸化
等の問題を生じない。しかし、フォルステライト被膜形
成時に、５ＩＯ２との反応性に劣る。この一長一短のた
めに、非水和マグネシア単味ては良好なフォルステライ
ト被膜の形成は難しい。この非水和マグネシアを本発明
の高温焼成したマグネシアと混合して使用すると、フォ
ルステライト被膜の形成時に必要な水分が確保され、且
つ非水和マグネシアの特性も活かされて、優れたフォル
ステライト被膜が形成される。This annealing separator can be used in combination with non-hydrated magnesia. Non-hydrated magnesia is said to have almost no hydration water, so it does not carry over hydration water and does not cause problems such as overoxidation. However, it has poor reactivity with 5IO2 when forming a forsterite film. Because of these advantages and disadvantages, it is difficult to form a good forsterite film using only non-hydrated magnesia. When this non-hydrated magnesia is used in combination with the high-temperature calcined magnesia of the present invention, the moisture necessary for forming a forsterite film is secured, and the properties of non-hydrated magnesia are also utilized, resulting in an excellent forsterite film. is formed.
また、雰囲気ガスからの窒素吸収を促進させ、二次再結
晶を安定化させるために、窒化クロム窒化チタン、窒化
バナジウム、窒化マンガン等の窒化物を添加することも
できる。Furthermore, nitrides such as chromium nitride titanium nitride, vanadium nitride, manganese nitride, etc. can be added in order to promote nitrogen absorption from the atmospheric gas and stabilize secondary recrystallization.
水和マクネシアの予備乾燥温度は、鋼板の仕上げ焼鈍時
におけるフォルステライト被膜形成温度域、すなわち焼
鈍分離剤中のマグネシアと鋼板表面の酸化層Ｓ ＋ ０
２が反応し、被膜を形成する温度域である。この温度域
は、鋼板表面にある酸化層の組成、雰囲気ガスの露点、
不可避的不純物も含めた焼鈍分離剤への添加物等により
変動するが、通常９２０〜１１００℃の範囲にある。The pre-drying temperature of hydrated magnesia is the forsterite film formation temperature range during final annealing of the steel sheet, that is, the magnesia in the annealing separator and the oxidized layer S + 0 on the surface of the steel sheet.
This is the temperature range where 2 reacts and forms a film. This temperature range depends on the composition of the oxide layer on the surface of the steel sheet, the dew point of the atmospheric gas,
Although it varies depending on additives to the annealing separator including unavoidable impurities, it is usually in the range of 920 to 1100°C.
Ｃ００５％、Ｓｉ３．２％、 Ｍｎ ０．１２％ ３０
．０８％、Ａ１０．０３％、 Ｎ Ｏ，０５％を含有す
る熱延鋼板を１１２０℃で３分間焼鈍した後、板厚０．
３ｍｍに冷間圧延し、８５０℃で３分間水素雰囲気中で
脱炭焼鈍した。この焼鈍板に焼鈍分離剤を塗布して、幅
１０００ｍｍ、 内径６００關の１０トンコイルに巻き
取って、８２７５％、Ｎ２２５％の雰囲気中で１１５０
℃Ｘ３０時間仕上げ焼鈍した。得られた製品の特性を、
次の表に示す。C005%, Si3.2%, Mn 0.12% 30
．． After annealing a hot-rolled steel plate containing 0.08%, A10.03%, and NO.05% at 1120°C for 3 minutes, the plate thickness was reduced to 0.08%.
It was cold rolled to a thickness of 3 mm and decarburized annealed at 850° C. for 3 minutes in a hydrogen atmosphere. This annealed plate was coated with an annealing separator, wound into a 10-ton coil with a width of 1000 mm and an inner diameter of 600 mm, and heated to 1150 mm in an atmosphere of 8275% and N225%.
Finish annealing was performed at ℃ for 30 hours. The characteristics of the obtained product,
Shown in the table below.
なお、数表における実施例では、水と混じえて水和した
マグネシアを９５０℃で予備乾燥したものを基材とし、
これにＭｎＯを５％、ＴｉＯを２％添加したものを焼鈍
分離剤として使用し、６ｇ／ｍ″の割合で焼鈍板に静電
塗布した。他方、比較例では、予備乾燥しないマグネシ
アを使用する外は、実施例と同様の条件下で焼鈍分離剤
を焼鈍板に塗布した。また、二次再結晶は、結晶方位の
集積度（ゴス方位からのズレ角度）によって判定し、被
膜密着性は、１０ｍｍ径曲げ時の被膜の剥離度合によっ
て判定した。In addition, in the examples in the table, the base material is magnesia hydrated by mixing with water and pre-dried at 950 ° C.
A mixture containing 5% MnO and 2% TiO was used as an annealing separator and electrostatically applied to the annealed plate at a rate of 6 g/m''.On the other hand, in a comparative example, magnesia without pre-drying was used. An annealing separator was applied to the annealed plate under the same conditions as in Examples.Secondary recrystallization was determined by the degree of crystal orientation accumulation (deviation angle from Goss orientation), and film adhesion was determined by , the degree of peeling of the coating upon bending to a diameter of 10 mm was determined.
この表から明らかなように、予備乾燥したマグネシアを
使用した本実施例では、鋼板に対する密着性に優れた被
膜が形成され、磁気特性も大幅に向上している。しかも
、磁束密度、鉄損共にバラツキが少なく、安定した品質
をもつ電磁鋼板が得られた。As is clear from this table, in this example using pre-dried magnesia, a film with excellent adhesion to the steel plate was formed, and the magnetic properties were also significantly improved. Furthermore, an electrical steel sheet with stable quality and little variation in magnetic flux density and iron loss was obtained.
これに対し、比較例では得られた被膜の密着性は低く、
一部に剥離が見られた。また、磁束密度及び鉄損共に低
い値を示しており、しかもバラツキの大きなものであっ
た。In contrast, the adhesion of the film obtained in the comparative example was low;
Peeling was observed in some parts. Furthermore, both magnetic flux density and iron loss showed low values, and there were large variations.
以上に説明したように、本発明においては、フォルステ
ライト形成温度域でマク不シアを予備乾燥させ、これを
方向性電磁鋼板用焼鈍分離剤の主成分としている。その
ため、仕上げ焼鈍時の昇温過程において焼鈍分離剤から
水分を放出することなく、フォルステライト被膜形成段
階でＭｇＯと３１０、と反応を促進させる水分を放出し
ている。As explained above, in the present invention, makushia is pre-dried in the forsterite forming temperature range, and this is used as the main component of the annealing separator for grain-oriented electrical steel sheets. Therefore, moisture is not released from the annealing separator during the temperature raising process during final annealing, but water that promotes the reaction with MgO and 310 is released during the forsterite film formation stage.
そのため、焼鈍された鋼板にスケール、被膜のバラツキ
、二次再結晶不良等が発生ずることなく、安定した品質
をもつ電磁鋼板を製造することが可能となる。Therefore, it is possible to produce an electrical steel sheet with stable quality without causing scale, film variation, secondary recrystallization defects, etc. in the annealed steel sheet.
第１図は、水和マグネシアの水和水分量を温度との関係
において表したグラフである。
特許出願人 新日本製鐵 株式會社代 理
人 小 堀 益 （ほか２名）第
図
温度
℃FIG. 1 is a graph showing the hydrated water content of hydrated magnesia in relation to temperature. Patent applicant Nippon Steel Corporation Representative
Masu Kobori (and 2 others) Figure temperature ℃
Claims (1)
ト被膜形成温度域で予備乾燥させることを特徴とする焼
鈍分離剤用マグネシアの乾燥方法。1. A method for drying magnesia for use as an annealing separating agent, which comprises pre-drying magnesia containing hydrated water in a temperature range for forming a forsterite film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27809788A JPH02125883A (en) | 1988-11-01 | 1988-11-01 | Method for drying magnesia for separation agent at annealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27809788A JPH02125883A (en) | 1988-11-01 | 1988-11-01 | Method for drying magnesia for separation agent at annealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02125883A true JPH02125883A (en) | 1990-05-14 |
Family
ID=17592595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27809788A Pending JPH02125883A (en) | 1988-11-01 | 1988-11-01 | Method for drying magnesia for separation agent at annealing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02125883A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019505664A (en) * | 2015-12-18 | 2019-02-28 | ポスコＰｏｓｃｏ | Annealing separator for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet |
-
1988
- 1988-11-01 JP JP27809788A patent/JPH02125883A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019505664A (en) * | 2015-12-18 | 2019-02-28 | ポスコＰｏｓｃｏ | Annealing separator for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet |
| US11505843B2 (en) | 2015-12-18 | 2022-11-22 | Posco | Annealing separator for oriented electrical steel sheet, oriented electrical steel sheet, and manufacturing method of oriented electrical steel sheet |
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