JP3311027B2 - Finish annealing method for grain-oriented electrical steel sheets with excellent coating properties - Google Patents
Finish annealing method for grain-oriented electrical steel sheets with excellent coating propertiesInfo
- Publication number
- JP3311027B2 JP3311027B2 JP18521292A JP18521292A JP3311027B2 JP 3311027 B2 JP3311027 B2 JP 3311027B2 JP 18521292 A JP18521292 A JP 18521292A JP 18521292 A JP18521292 A JP 18521292A JP 3311027 B2 JP3311027 B2 JP 3311027B2
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- Prior art keywords
- coil
- finish annealing
- grain
- oriented electrical
- annealing
- Prior art date
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- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は方向性電磁鋼板の製造方
法において被膜特性を改善するための仕上焼鈍方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finish annealing method for improving film properties in a method for producing a grain-oriented electrical steel sheet.
【０００２】[0002]
【従来の技術】方向性電磁鋼板は主としてトランス、発
電機、その他の電気機器の鉄心材料として用いられ、磁
気特性、特に鉄損が低いことに加え、鋼板表面に良好な
グラス被膜が形成されていることが要求される。このグ
ラス被膜は鉄心とした場合の板間の電気絶縁性を確保す
るとともに、鋼板に張力を付加し鉄損を改善する役割も
果している。2. Description of the Related Art Grain-oriented electrical steel sheets are mainly used as iron core materials for transformers, generators and other electric equipment. In addition to their low magnetic properties, especially low iron loss, good glass coatings are formed on the steel sheet surface. Is required. The glass coating not only secures the electrical insulation between the plates when used as an iron core, but also plays a role in applying tension to the steel plates and improving iron loss.
【０００３】方向性電磁鋼板のグラス被膜を形成する方
法としては、所望の最終板厚に冷間圧延した珪素鋼板を
湿潤水素雰囲気中約８００℃の温度で脱炭焼鈍を施す
際、その鋼板の表面にＳｉＯ2 を主成分とする酸化膜を
形成させ、これにＭｇＯを主成分とするパウダーを塗布
後コイル状に巻き取って仕上焼鈍を施すことによりＳｉ
Ｏ2 とＭｇＯを反応させフォルトステライト（Ｍｇ2 Ｓ
ｉＯ4 ）を形成させている。[0003] As a method of forming a glass coating on a grain-oriented electrical steel sheet, when a silicon steel sheet cold-rolled to a desired final sheet thickness is subjected to decarburization annealing at a temperature of about 800 ° C in a humid hydrogen atmosphere, the steel sheet is subjected to a decarburization annealing. An oxide film containing SiO 2 as a main component is formed on the surface, and a powder containing MgO as a main component is applied on the oxide film.
O 2 and MgO are reacted to form a fault stellite (Mg 2 S
iO 4 ).
【０００４】このグラス被膜の性状は脱炭焼鈍過程で形
成される鋼板表面の酸化膜の量、質、ＭｇＯスラリーの
塗布、乾燥状態、更には仕上焼鈍時の温度、雰囲気等の
影響を受けることから、良好なグラス被膜を得るために
これら影響因子について多くの改善、検討がなされてき
た。The properties of the glass coating are affected by the amount and quality of the oxide film on the surface of the steel sheet formed in the decarburizing annealing process, the application and drying of the MgO slurry, and the temperature and atmosphere during the finish annealing. Therefore, many improvements and studies have been made on these influencing factors in order to obtain a good glass coating.
【０００５】例えば特開昭５３−５８００号公報では、
仕上焼鈍工程中１１５０℃〜１２５０℃まで昇温する温
度領域内で雰囲気の平均露点を−２０℃〜２０℃に保持
した上で１１５０〜１２５０℃の間の露点を１０℃以下
とし、且つ露点１０℃以上での高温焼鈍期間を５時間以
下とすることにより良好なフォルステライト被膜が形成
できることが開示されている。For example, in JP-A-53-5800,
The average dew point of the atmosphere is kept at -20 ° C to 20 ° C in the temperature range where the temperature rises to 1150 ° C to 1250 ° C during the finish annealing step, and the dew point between 1150 ° C and 1250 ° C is set to 10 ° C or less, and the dew point is 10 ° C. It is disclosed that a good forsterite film can be formed by setting the high-temperature annealing period at not less than 5 ° C. to 5 hours or less.
【０００６】このような検討の結果、コイルの端部を除
く鋼板のほとんどの部分では良好なグラス被膜を形成す
るに大きな効果があったと考えられる。しかしコイルの
端部においては未だに被膜欠陥が多発する状況にあり、
歩留落ちの大きな原因となっているのが実情である。[0006] As a result of such studies, it is considered that most of the steel sheet except for the end of the coil had a great effect in forming a good glass coating. However, there are still many coating defects at the coil end,
The actual cause of the drop in yield is the fact.
【０００７】[0007]
【発明が解決しようとする課題】発明者らは、これらコ
イル端部に散見される被膜欠陥を詳細に調査した結果、
この欠陥は被膜が円形状に剥離し素地の金属部が露出す
る所謂シモフリと称されるものであることを見いだし
た。As a result of a detailed investigation of the coating defects found at the ends of these coils, the inventors found that
It has been found that this defect is what is called a so-called shimofuri in which the coating is peeled off in a circular shape and the metal part of the base is exposed.
【０００８】本発明は被膜特性の優れた方向性電磁鋼板
の仕上焼鈍法を提供するものである。The present invention provides a finish annealing method for a grain-oriented electrical steel sheet having excellent coating properties.
【０００９】[0009]
【課題を解決するための手段】本発明者らはこのシモフ
リの発生が仕上焼鈍工程中コイル温度が１０００℃まで
の間にコイル端部の酸化被膜中の鉄系酸化物が還元され
た結果、局所的な吸窒が生じることに起因することを見
いだし、これを防止するためにはこの温度領域に有る間
雰囲気の酸化度指標であるＰ H2 O/Ｐ H2 を０．５以上
に保って酸化被膜中の鉄系酸化物の還元を防止すれば良
いことを見いだした。Means for Solving the Problems The inventors of the present invention have found that the occurrence of shimofuri is caused by the reduction of iron oxide in the oxide film at the coil end during the finish annealing step while the coil temperature is up to 1000 ° C. It was found that this was caused by local nitrogen absorption, and in order to prevent this, P H 2 O / P H 2 which is an index of the degree of oxidation of the atmosphere was kept at 0.5 or more while in this temperature range. It was found that it was sufficient to prevent the reduction of iron-based oxides in the oxide film.
【００１０】以下本発明について詳細に述べる。電磁鋼
スラブを熱間圧延した後熱延板焼鈍を挿んで１回もしく
は２回の冷間圧延を施して所望の板厚とした冷延板は先
ず脱炭焼鈍される。Hereinafter, the present invention will be described in detail. After the electromagnetic steel slab is hot-rolled, hot-rolled sheet annealing is inserted and cold-rolled once or twice to obtain a desired thickness of the cold-rolled sheet is first decarburized and annealed.
【００１１】脱炭焼鈍はストリップを湿潤水素雰囲気中
約８００℃の炉温において連続的に通すことにより雰囲
気中水分と鋼中炭素を反応させ脱炭させるが、同時に鋼
中成分が雰囲気中水分により酸化を受けＳｉＯ2 を主成
分とした酸化被膜が鋼板表面に形成される。In the decarburizing annealing, the moisture in the atmosphere and the carbon in the steel react with each other by passing the strip continuously at a furnace temperature of about 800 ° C. in a humid hydrogen atmosphere to decarbonize the steel. Upon oxidation, an oxide film containing SiO 2 as a main component is formed on the surface of the steel sheet.
【００１２】この酸化被膜は仕上焼鈍において最終的に
形成されるグラス被膜の素地となるものであるが、発明
者らは良好なグラス被膜を形成させるためには、この酸
化被膜の質を適正なものとすることが重要であることを
見いだした。即ちこの酸化被膜中にはＳｉＯ2 に加え微
量の鉄系酸化物が含まれているが、この鉄系酸化物が少
ない場合、本発明において問題としているシモフリと称
される被膜欠陥が多発することが見いだされた。The oxide film serves as a base material for a glass film finally formed in the finish annealing. However, the present inventors have found that the quality of the oxide film must be properly adjusted in order to form a good glass film. I found it important to do things. In other words, this oxide film contains a small amount of iron-based oxides in addition to SiO 2. If the amount of this iron-based oxide is small, film defects called shimofuri, which is a problem in the present invention, frequently occur. Was found.
【００１３】このシモフリ欠陥は仕上焼鈍において鋼板
が雰囲気中の窒素を過剰に吸収したのち、最終的な純化
過程で窒素が鋼中より放出される際多量の窒素ガスによ
り被膜が破壊されることにより生じるものであるが、鉄
系酸化物はこの仕上焼鈍工程中において窒化が生じる低
い温度域において、ＳｉＯ2 と表面に塗布されたＭｇＯ
による被膜形成反応を促進させる作用を持ち、この段階
において表面被膜が形成される結果窒化が抑制され、シ
モフリ欠陥が減少することが判明した。[0013] This shimofuri defect is caused by the fact that after the steel sheet excessively absorbs nitrogen in the atmosphere during finish annealing, a large amount of nitrogen gas destroys the film when nitrogen is released from the steel in the final purification process. However, in the low temperature range where nitriding occurs during the finish annealing step, the iron-based oxide is formed of SiO 2 and MgO coated on the surface.
Has the effect of accelerating the film-forming reaction due to the formation of a surface film at this stage. As a result, it has been found that nitridation is suppressed and the Shimofuri defects are reduced.
【００１４】このようにシモフリ欠陥を抑える作用を持
つ鉄系酸化物は、脱炭焼鈍時の酸化度等により適正な範
囲に調整することが可能であり、且つストリップ状態で
の焼鈍処理であることから鋼板の幅方向に鉄系酸化物を
均一に確保することが可能である。[0014] The iron-based oxide having the function of suppressing the shimo-furi defect can be adjusted to an appropriate range by the degree of oxidation during decarburization annealing, and the annealing treatment in a strip state. Therefore, it is possible to uniformly secure the iron-based oxide in the width direction of the steel sheet.
【００１５】このように脱炭焼鈍された珪素鋼板は、表
面に仕上焼鈍時の焼きつき防止とグラス被膜形成を目的
にスラリー状としたＭｇＯを主成分とするパウダーを塗
布後、乾燥炉にてスラリー中のフリー水分を除去した後
コイル状に巻き取られ、仕上焼鈍を施される。The decarburized and annealed silicon steel sheet is coated with a powder containing MgO as a main component in the form of slurry for the purpose of preventing seizure during finish annealing and forming a glass film on the surface, and then drying in a drying furnace. After removing free moisture in the slurry, the slurry is wound into a coil and subjected to finish annealing.
【００１６】仕上焼鈍はコイルをその板端部が上下とな
るよう焼鈍具の上に搭載され、更にコイルに触れる雰囲
気を調整するためのインナーカバーで覆われその外部よ
り加熱することにより焼鈍が施される。コイルを覆うイ
ンナーカバー内には水素と窒素から成るドライなガスが
供給される。In the finish annealing, the coil is mounted on an annealing tool so that the plate ends are vertically arranged, and further covered with an inner cover for adjusting the atmosphere in contact with the coil, and is subjected to annealing by heating from the outside. Is done. A dry gas composed of hydrogen and nitrogen is supplied into the inner cover that covers the coil.
【００１７】仕上焼鈍は図５に示した如く先ず、該焼鈍
に先立って鋼板表面に塗布されたＭｇＯパウダーに含ま
れる結晶水の分解を目的として炉温５００〜７００℃程
度で一旦保定され、次に二次再結晶及びグラス被膜を形
成させる段階として１２００℃程度まで徐々に昇温さ
れ、最後に１２００℃程度にて鋼中のＳ，Ｎ等の磁気時
効を引き起こす元素を除去する純化が成される。As shown in FIG. 5, the finish annealing is first performed at a furnace temperature of about 500 to 700.degree. The temperature is gradually raised to about 1200 ° C. as a step of forming a secondary recrystallization and a glass film, and finally purification is performed at about 1200 ° C. to remove elements that cause magnetic aging such as S and N in steel. You.
【００１８】これらの仕上焼鈍過程においてグラス被膜
の劣化、特にコイル端部のシモフリ欠陥の発生原因につ
いて検討するため、発明者らは焼鈍過程におけるインナ
ーカバー内雰囲気及びコイル内の酸化度を調査した。図
１にインナーカバー内及びコイル中央部とコイル端部よ
り５０mm位置の酸化度の推移を測定した結果を示す。In order to study the cause of the deterioration of the glass coating in the finish annealing process, particularly the cause of the shimofuri defect at the coil end, the inventors investigated the atmosphere in the inner cover and the degree of oxidation in the coil during the annealing process. FIG. 1 shows the results of measuring changes in the degree of oxidation in the inner cover and at a position 50 mm from the coil center and the coil end.
【００１９】初期のＭｇＯパウダー中の結晶水を除去す
る段階ではパウダーより発生する水分のためコイル内は
高い酸化度となっており、これに伴いインナーカバー内
の酸化度も上昇しているが、結晶水の除去が完了する５
００℃以上ではコイル内の酸化度は急激に低下、コイル
中央部でのＰ H2 O/Ｐ H2 は約０．０１であるのに対し
雰囲気に近いコイル端部のＰ H2 O/Ｐ H2 は０．００１
程度にまで低下していることを見いだした。At the initial stage of removing the water of crystallization in the MgO powder, the inside of the coil has a high degree of oxidation due to the water generated from the powder, and the degree of oxidation in the inner cover has increased accordingly. Removal of water of crystallization is completed 5
When the temperature is higher than 00 ° C., the degree of oxidation in the coil rapidly decreases, and the PH 2 O / P H 2 at the center of the coil is about 0.01, whereas the PH 2 O / P at the coil end near the atmosphere is about 0.01. H 2 is 0.001
It has been found that it has fallen to a degree.
【００２０】このようなＰ H2 O/Ｐ H2 の差において脱
炭焼鈍板表面の酸化膜の変化をオフライン試験において
調査したところ酸化膜中の鉄系酸化物の還元状態がＰ H
2 O/Ｐ H2 に比例して抑えられていることが見いだされ
た。更に実炉においてインナーカバー内に不活性ガスで
あるＡｒを注入しこれをコイル幅中央部において微量ガ
スセンサーにて検出することによりコイル板間のガス移
動速度を把握した。When the change in the oxide film on the surface of the decarburized annealed plate was examined in an off-line test for such a difference in P H 2 O / P H 2 , the reduction state of the iron-based oxide in the oxide film was P H
It was found that it was suppressed in proportion to 2 O / P H 2 . Further, in an actual furnace, Ar, which is an inert gas, was injected into the inner cover, and this was detected by a trace gas sensor at the center of the coil width to grasp the gas moving speed between the coil plates.
【００２１】図２はこれらの実験結果を基にコイル幅方
向の鉄系酸化物の還元状態をシミュレーションした結果
であるが、板中央部の酸化物は板間のガス移動速度が律
速となってほとんど還元されないのに対し、板端部は、
コイル外部とのガス交換が比較的自在に行われ、鉄系酸
化物は還元され易い状況にあると推察される。FIG. 2 shows the result of simulating the reduction state of the iron-based oxide in the coil width direction based on the results of these experiments. While little is reduced, the plate edge is
It is presumed that gas exchange with the outside of the coil is performed relatively freely, and iron-based oxides are easily reduced.
【００２２】一方、脱炭焼鈍板を一旦還元雰囲気中に置
いて鉄系酸化物を十分に還元した鋼板の窒化特性につい
てオフライン実験を行ったところ、図３に示したように
鋼板温度５００℃程度より窒化が始まり鋼板温度に応じ
た吸窒が生じることが認められた。On the other hand, when the decarburized annealed sheet was once placed in a reducing atmosphere and an off-line experiment was performed on the nitriding characteristics of the steel sheet in which the iron-based oxide was sufficiently reduced, the steel sheet temperature was about 500 ° C. as shown in FIG. It was recognized that nitridation started more and nitrogen absorption occurred according to the steel sheet temperature.
【００２３】これらの調査結果より発明者らは、コイル
の端部にシモフリ欠陥が多発するのは脱炭焼鈍工程にお
いて一旦は鉄系酸化物を板幅方向均一に適正量生成させ
得るものの仕上焼鈍過程のかかる状況において、特にコ
イル端部の鉄系酸化物が選択的に還元され失われる結
果、先に述べた吸窒現象の抑制効果が不十分となりシモ
フリ欠陥が発生することが原因であることを突き止め
た。According to the results of these investigations, the inventors found that the occurrence of shimofuri defects frequently at the ends of the coil was due to the fact that although an appropriate amount of iron-based oxides could be produced uniformly in the width direction of the sheet in the decarburizing annealing step, finish annealing was performed. In such a situation of the process, in particular, the iron-based oxide at the coil end is selectively reduced and lost, and as a result, the effect of suppressing the nitrogen absorption phenomenon described above is insufficient, and the cause is that a shimofuri defect occurs. Ascertained.
【００２４】そこで本発明者らは、このコイル端部に多
発するシモフリ欠陥を抑制する方法として鋼板の吸窒が
起こる以前及び吸窒が生じている間、この部分の鉄系酸
化物が還元されないよう雰囲気を調整する方法について
実験、検討を行い適正方法を見いだした。その方法につ
いて図４に基づいて説明する。Therefore, the inventors of the present invention have proposed a method for suppressing the occurrence of shimofuri defects frequently occurring at the coil end portion, in which the iron-based oxide in this portion is not reduced before and during the nitrogen absorption of the steel sheet. Experiments and examinations were conducted on methods for adjusting the atmosphere to find an appropriate method. The method will be described with reference to FIG.
【００２５】脱炭焼鈍工程において酸化膜中の鉄系酸化
物を適正値に調整されたコイル１は仕上焼鈍具２の上に
搭載され雰囲気調整用のインナーカバー３で覆われ焼鈍
炉４により加熱される。図５に示した加熱パターンに従
って仕上焼鈍を施す過程において図中に示したコイル端
部の温度が１０００℃までの間インナーカバー内雰囲気
の酸化度を検出器５により検出し、Ｐ H2 O/Ｐ H2 が
０．５以上となるように供給ガスの水分を加湿装置６に
より調整する。In the decarburizing annealing step, the coil 1 in which the iron-based oxide in the oxide film has been adjusted to an appropriate value is mounted on a finishing annealing tool 2, covered with an inner cover 3 for adjusting the atmosphere, and heated by an annealing furnace 4. Is done. In the process of performing the finish annealing according to the heating pattern shown in FIG. 5, the degree of oxidation of the atmosphere in the inner cover is detected by the detector 5 until the temperature of the coil end shown in the figure is up to 1000 ° C., and the PH 2 O / PH 2
The moisture of the supply gas is adjusted by the humidifier 6 so as to be 0.5 or more.
【００２６】このように仕上焼鈍工程で生じるコイル幅
方向の酸化膜の不均一性をインナーカバー内の雰囲気を
積極的に調整することで解消することによりコイル端部
のシモフリ欠陥を抑制し、板全幅において良好なグラス
被膜を得ることが可能となる。As described above, the unevenness of the oxide film in the coil width direction generated in the finish annealing step is eliminated by actively adjusting the atmosphere in the inner cover, thereby suppressing the shimofuri defect at the coil end. A good glass coating can be obtained over the entire width.
【００２７】[0027]
【実施例】電磁鋼スラブを所定の温度、時間で再加熱
し、２．３mmに熱間圧延し、熱延板焼鈍を施した後、冷
間圧延により０．３mmの板厚とした。この冷延鋼板を脱
炭焼鈍するに当たり酸化度Ｐ H2 O/Ｐ H2 を０．３２に
て処理し、鉄系酸化物を約０．１５ｇ／ｍ2 確保しシモ
フリ欠陥を抑制できる範囲に調整した。EXAMPLE A magnetic steel slab was reheated at a predetermined temperature for a predetermined time, hot rolled to 2.3 mm, annealed by hot rolling, and then cold rolled to a thickness of 0.3 mm. When the cold rolled steel sheet is decarburized and annealed, the degree of oxidation P H 2 O / P H 2 is treated at 0.32 to secure an iron-based oxide of about 0.15 g / m 2, within a range in which Shimofuri defects can be suppressed. It was adjusted.
【００２８】更にこれにＭｇＯを塗布しコイル状に巻き
取って仕上焼鈍炉に搭載し仕上焼鈍を行う過程において
インナーカバー内の酸化度Ｐ H2 O/Ｐ H2 を０．０５，
０．５の各条件に調整するとともに、この酸化度調整を
行う上限温度を変化させ、最終的な被膜形成状況を比較
した。Further, in the process of applying MgO thereon, winding it up in a coil shape, mounting it in a finish annealing furnace and performing finish annealing, the oxidation degree P H 2 O / P H 2 in the inner cover is set to 0.05 ,
The conditions were adjusted to 0.5 and the upper limit temperature at which the oxidation degree was adjusted was changed, and the final film formation conditions were compared.
【００２９】結果を表１に示す。The results are shown in Table 1.
【００３０】[0030]
【表１】 [Table 1]
【００３１】酸化度Ｐ H2 O/Ｐ H2 が０．０５程度では
いかなる温度範囲においても酸化度調整を行った効果は
見られず、コイル端部にシモフリ欠陥が発生する。また
酸化度を０．５以上に調整した場合でもこの調整を８０
０℃程度の低い温度で中止すると同様のシモフリ欠陥が
発生した。しかし一方、酸化度調整を１０５０℃まで継
続するとコイル端部が過酸化されスケール欠陥を生じる
ことが判明した。When the degree of oxidation P H 2 O / P H 2 is about 0.05, the effect of adjusting the degree of oxidation is not observed in any temperature range, and a shimofuri defect occurs at the coil end. Even when the degree of oxidation is adjusted to 0.5 or more, this adjustment must be 80 or more.
When the operation was stopped at a low temperature of about 0 ° C., the same Shimofuri defect occurred. On the other hand, however, it was found that if the adjustment of the degree of oxidation was continued up to 1050 ° C., the coil ends would be overoxidized, causing scale defects.
【００３２】以上の実炉実験よりコイル端部に発生する
シモフリ欠陥を抑制し且つ、過酸化を防止する最適雰囲
気調整方法として、コイル端部の温度が約１０００℃と
なるまでの間インナーカバー内の酸化度Ｐ H2 O/Ｐ H2
を０．５以上に調整することが有効であることを見いだ
した。As an optimum atmosphere adjusting method for suppressing the shimofuri defect generated at the coil end and preventing peroxidation from the above-mentioned actual furnace experiments, the inner cover is used until the temperature at the coil end reaches about 1000 ° C. Oxidation degree P H 2 O / P H 2
Has been found to be effective to be adjusted to 0.5 or more .
【００３３】[0033]
【発明の効果】本発明によれば、実施例に示した如く従
来コイルの端部に多発していたシモフリ欠陥を抑制で
き、全板幅に渡って均一な良好被膜を持つ方向性電磁鋼
板を得ることが可能となる。According to the present invention, as shown in the embodiment, it is possible to suppress the shiofuri defect which has frequently occurred at the end of the conventional coil, and to provide a grain-oriented electrical steel sheet having a uniform good coating over the entire sheet width. It is possible to obtain.
【図１】仕上焼鈍過程におけるコイル内及びインナーカ
バー内の酸化度Ｐ H2 O/Ｐ H2の推移を実測した結果を
示す図表である。FIG. 1 is a table showing the results of actual measurement of changes in the degree of oxidation P H 2 O / P H 2 in a coil and an inner cover during a finish annealing process.
【図２】コイル板幅方向の鉄系酸化物の還元状態につい
てシミュレーションを行った結果を示す図表である。FIG. 2 is a table showing a result of a simulation performed on a reduction state of an iron-based oxide in a coil plate width direction.
【図３】還元処理を施した脱炭焼鈍板の窒化特性を実測
した結果を示す図表である。FIG. 3 is a table showing the results of actually measuring the nitriding characteristics of a decarburized annealed sheet subjected to a reduction treatment.
【図４】仕上焼鈍設備を示す説明図である。FIG. 4 is an explanatory view showing a finish annealing facility.
【図５】仕上焼鈍のヒートパターンを示す図表である。FIG. 5 is a chart showing a heat pattern of finish annealing.
１ 焼鈍コイル ２ 焼鈍具 ３ インナーカバー ４ 仕上焼鈍炉 ５ 酸化度センサー ６ ガス加湿装置 DESCRIPTION OF SYMBOLS 1 Annealing coil 2 Annealing tool 3 Inner cover 4 Finish annealing furnace 5 Oxidation degree sensor 6 Gas humidifier
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒井 慎一郎 北九州市戸畑区飛幡町１番１号 新日本 製鐵株式会社 八幡製鐵所内 (56)参考文献 特開 平５−171284（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 8/12 C21D 9/46 501 H01F 1/16 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinichiro Arai 1-1, Hibata-cho, Tobata-ku, Kitakyushu-shi Nippon Steel Corporation Yawata Works (56) References JP-A-5-171284 (JP, A) (58) Field surveyed (Int.Cl. 7 , DB name) C21D 8/12 C21D 9/46 501 H01F 1/16
Claims (1)
コイル端部の温度が１０００℃以下の温度領域に有る
間、焼鈍コイルを収めたインナーカバー内の雰囲気のＰ
H2 O/Ｐ H2 を０．５以上に保持することを特徴とする
被膜特性の優れた方向性電磁鋼板の仕上焼鈍方法。In the finish annealing step of a grain-oriented electrical steel sheet, while the temperature of the coil end is in a temperature range of 1000 ° C. or less, the P of the atmosphere in the inner cover containing the annealed coil is set.
A method for finishing annealing a grain-oriented electrical steel sheet having excellent coating properties, characterized in that H 2 O / P H 2 is maintained at 0.5 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18521292A JP3311027B2 (en) | 1992-07-13 | 1992-07-13 | Finish annealing method for grain-oriented electrical steel sheets with excellent coating properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18521292A JP3311027B2 (en) | 1992-07-13 | 1992-07-13 | Finish annealing method for grain-oriented electrical steel sheets with excellent coating properties |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0625750A JPH0625750A (en) | 1994-02-01 |
| JP3311027B2 true JP3311027B2 (en) | 2002-08-05 |
Family
ID=16166838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18521292A Expired - Fee Related JP3311027B2 (en) | 1992-07-13 | 1992-07-13 | Finish annealing method for grain-oriented electrical steel sheets with excellent coating properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3311027B2 (en) |
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1992
- 1992-07-13 JP JP18521292A patent/JP3311027B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0625750A (en) | 1994-02-01 |
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