JP3392698B2 - Method for manufacturing grain-oriented electrical steel sheet with extremely excellent magnetic properties - Google Patents
Method for manufacturing grain-oriented electrical steel sheet with extremely excellent magnetic propertiesInfo
- Publication number
- JP3392698B2 JP3392698B2 JP09932397A JP9932397A JP3392698B2 JP 3392698 B2 JP3392698 B2 JP 3392698B2 JP 09932397 A JP09932397 A JP 09932397A JP 9932397 A JP9932397 A JP 9932397A JP 3392698 B2 JP3392698 B2 JP 3392698B2
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- Prior art keywords
- strip
- electrical steel
- annealing
- magnetic properties
- temperature
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、２．５〜７．０％
のＳｉを含み、良好な鋼板形状をもち、かつ、極めて優
れた磁気特性を有する高磁束密度一方向性電磁鋼板の製
造方法に関するものである。TECHNICAL FIELD The present invention relates to 2.5 to 7.0%.
The present invention relates to a method for producing a high magnetic flux density unidirectional electrical steel sheet which contains Si, has a good steel sheet shape, and has extremely excellent magnetic characteristics.
【０００２】[0002]
【従来の技術】方向性電磁鋼板の磁気特性は一般に、鉄
損特性と励磁特性の両方で評価される。励磁特性を高め
ることは設計磁束密度を高める機器の小型化が可能とな
り、一方、鉄損特性を少なくすることは、電気機器とし
て使用する際、熱エネルギーとして失われるものを少な
くし、消費電力を節約できる点で有効である。さらに、
製品の結晶粒の＜１００＞軸を圧延方向に揃えること
は、磁化特性を高め、鉄損特性も低くすることができる
ため、近年特にこの面で多くの研究が重ねられ、様々な
製造技術が開発された。2. Description of the Related Art The magnetic properties of grain-oriented electrical steel sheets are generally evaluated by both iron loss properties and excitation properties. Increasing the excitation characteristics makes it possible to downsize equipment that increases the design magnetic flux density, while reducing iron loss characteristics reduces the loss of heat energy when used as electrical equipment and reduces power consumption. It is effective in saving money. further,
Aligning the <100> axis of the crystal grains of the product in the rolling direction can enhance the magnetization characteristics and lower the iron loss characteristics. Therefore, in recent years, many studies have been conducted particularly in this aspect, and various manufacturing techniques have been applied. It has been developed.
【０００３】たとえば、特公昭４０−１５６４４号公報
には高い磁束密度を得るために、方向性電磁鋼板の製造
方法が開示されている。これは、ＡｌＮ＋ＭｎＳをイン
ヒビターとして機能させ、最終冷延工程における圧下率
が８０％を超える強圧下とする製造方法である。この方
法によれば二次再結晶粒の｛１１０｝＜００１＞方位の
集積度が高く、Ｂ8 が１．８７０Ｔ以上の高磁束密度を
有する方向性電磁鋼板が得られる。For example, Japanese Examined Patent Publication No. 40-15644 discloses a method for producing a grain-oriented electrical steel sheet in order to obtain a high magnetic flux density. This is a manufacturing method in which AlN + MnS is made to function as an inhibitor and the rolling reduction in the final cold rolling step is 80% or more. According to this method, it is possible to obtain a grain-oriented electrical steel sheet having a high degree of integration of the {110} <001> orientation of the secondary recrystallized grains and a high magnetic flux density of B8 of 1.870T or more.
【０００４】しかし、この製造方法はある程度の鉄損の
低減は図れるのであるが、二次再結晶マクロの粒径が１
０mmオーダと大きいため、鉄損に影響する因子である渦
電流損を減らすことができず、良好な鉄損値が得られて
いなかった。これを改善するために、特公昭５７−２２
５２号公報に開示されている鋼板にレーザ処理を施す方
法、さらに特公昭５８−２５６９号公報には鋼板に機械
的な歪みを加える方法など、磁区を細分化する様々な方
法が開示されている。However, although this manufacturing method can reduce iron loss to some extent, the grain size of the secondary recrystallization macro is 1
Since it was large on the order of 0 mm, the eddy current loss, which is a factor affecting iron loss, could not be reduced, and a good iron loss value was not obtained. To improve this, Japanese Patent Publication No. 57-22
Various methods for subdividing magnetic domains are disclosed, such as a method of subjecting a steel sheet to laser treatment disclosed in Japanese Patent Publication No. 52-52, and a method of applying mechanical strain to the steel sheet in Japanese Patent Publication No. 58-2569. .
【０００５】一方、二次再結晶粒をより小さくして磁気
特性を向上する方法が特公平６−５１１８７号公報に開
示されている。該公報には、常温で圧延された鋼板（ス
トリップ）の脱炭焼鈍に際し、１４０℃／秒以上の加熱
速度で６５７℃以上の温度へ超急速焼きなまし処理する
ことが記載されている。しかし急速焼きなまし処理だけ
では十分な磁気特性が得られるとはいえない。On the other hand, Japanese Patent Publication No. 6-51187 discloses a method of making secondary recrystallized grains smaller to improve magnetic properties. The publication describes that during decarburization annealing of a steel sheet (strip) rolled at room temperature, an ultra-rapid annealing treatment is performed at a heating rate of 140 ° C / sec or more to a temperature of 657 ° C or more. However, it cannot be said that sufficient magnetic properties can be obtained only by rapid annealing.
【０００６】特開平７−６２４３６号公報には急速加熱
に際し、雰囲気を非酸化性にすると共に、２対の直接通
電加熱ロールを用いてストリップを加熱することによっ
て鉄損の低い一方向性電磁鋼板の製造法が提示されてい
る。この方法によれば、確かに低い鉄損値の方向性電磁
鋼板は得られるが、良好な板形状が得られるとは必ずし
もいえない。Japanese Unexamined Patent Publication (Kokai) No. 7-62436 discloses a unidirectional electrical steel sheet having a low iron loss by making the atmosphere non-oxidizing at the time of rapid heating and heating the strip using two pairs of direct current heating rolls. The manufacturing method of is presented. According to this method, a grain-oriented electrical steel sheet having a low iron loss value can be obtained, but it cannot necessarily be said that a good sheet shape can be obtained.
【０００７】[0007]
【発明が解決しようとする課題】ストリップを２対の通
電ロールを介して直接通電し、ストリップ自体のジュー
ル熱によって急速に加熱する場合に、搬送しているスト
リップに波が発生し、これが高温側の通電ロールに噛み
込まれて搬出されたストリップに絞りや皺などの形状不
良が生じることがある。特に、方向性電磁鋼板において
は脱炭焼鈍後のストリップの巻取時に前記したような形
状不良に基づく応力が生じ、これが２次再結晶時の結晶
方位を不安定にし、磁気特性を低下させる原因になる。When the strip is directly energized through two pairs of energizing rolls and rapidly heated by the Joule heat of the strip itself, a wave is generated in the strip being conveyed, which causes a high temperature side. In some cases, the strip that is bitten out by the current-carrying roll and is discharged may have a defective shape such as a squeeze or a wrinkle. Particularly, in the grain-oriented electrical steel sheet, stress caused by the above-mentioned shape defect occurs during winding of the strip after decarburization annealing, which makes the crystal orientation unstable during the secondary recrystallization and deteriorates the magnetic properties. become.
【０００８】そこで本発明は、脱炭焼鈍の際の急速加熱
処理を２対の通電ロールを用いて行う場合に、形状性と
磁気特性を両立させ、良好な板形状を得ると共に、極め
て優れた磁気特性を有する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。Therefore, the present invention achieves both good formability and good magnetic properties when a rapid heat treatment during decarburization annealing is performed by using two pairs of energizing rolls, and is extremely excellent. An object is to provide a method for manufacturing a grain-oriented electrical steel sheet having magnetic properties.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記の目的を
達成するためになされたものであり、以下の構成を要旨
とする。すなわち、重量で、Ｃ：０．１０％以下、Ｓ
ｉ：２．５〜７．０％ならびにＭｎ：０．０１５〜０．
１５％、ＳまたはＳｅ：０．００１〜０．０５％、酸可
溶性Ａｌ：０．０１〜０．０４％、Ｎ：０．００３〜
０．０３％を含み、残余はＦｅおよび不可避的不純物よ
りなる鋼について、最終製品厚まで圧延されたストリッ
プを脱炭焼鈍し、最終仕上焼鈍を施す工程を含む方向性
電磁鋼熱延板の製造方法において、ストリップを脱炭焼
鈍する際に、脱炭焼鈍の前で急速加熱を、中間にピンチ
ロールを配置した２対の通電ロールを用いて行い、該ピ
ンチロールで挟持する部分のストリップの温度が７５０
℃以下、或いは温度降下量が５０℃以内となるかのいず
れか、または両方を満足するように処理することを特徴
とする極めて優れた磁気特性を有する方向性電磁鋼板の
製造方法である。上記の２対の通電ロール間に設けられ
るピンチロールが、低温側通電ロールよりも高温側通電
ロール近傍に配置されることが好ましい。また上記急速
加熱は、脱炭焼鈍の昇温段階で行うことができる。 The present invention has been made to achieve the above object, and has the following structures. That is, by weight, C: 0.10% or less, S
i: 2.5 to 7.0% and Mn: 0.015 to 0.
15%, S or Se: 0.001-0.05%, acid acceptable
Soluble Al: 0.01 to 0.04%, N: 0.003 to
Manufacture of a grain-oriented electrical steel hot-rolled sheet including a step of decarburizing and annealing a strip rolled to a final product thickness and finally finishing annealing a steel containing 0.03% and the balance of Fe and inevitable impurities. in the method, when the decarburization annealing the strip, a rapid heating before decarburization annealing was carried out using two pairs of current supply rolls arranged pinch rolls in the middle of the strip portion for clamping in the pinch roll Temperature is 750
° C. or less, or the amount of temperature drop is within 50 ° C. or noise
It is a method for producing a grain-oriented electrical steel sheet having extremely excellent magnetic properties, which is characterized by performing treatment so as to satisfy either or both of them. Pinch rolls provided between the two pairs of current supply rolls, preferably than cold side conductive rolls are arranged on the high temperature side conducting <br/> role near neighbor. Also above rapid
The heating can be performed in the temperature rising stage of decarburization annealing.
【００１０】上記のように本発明は、前記急速加熱を通
電ロールを用いて行う場合に、押えロールと対になって
いる低温側通電ロールと同じく押えロールと対になって
いる高温側通電ロールの間に上下１対のピンチロールを
設置して、通電加熱されるストリップを挟んで通板する
に際し、このピンチロール部位におけるストリップ温度
を再結晶開始温度以下、すなわち７５０℃以下とする
か、ストリップの温度降下を５０℃以内に抑制すること
により、又はその両方を満足するようにして、良好なス
トリップ形状を確保し、かつ、優れた磁気特性、すなわ
ち高磁束密度（Ｂ8)：１．９２（Ｔ）以上となるような
方向性電磁鋼板を製造するものである。As described above, according to the present invention, when the rapid heating is performed by using the energizing roll, the low temperature side energizing roll paired with the holding roll and the high temperature side energizing roll paired with the holding roll are the same. When a pair of upper and lower pinch rolls are installed between the strips and the strips to be electrically heated are sandwiched between the strips, the strip temperature at the pinch roll portion is set to the recrystallization start temperature or lower, that is, 750 ° C or lower, or By suppressing the temperature drop within 50 ° C. within 50 ° C., or by satisfying both of them, a good strip shape is secured and excellent magnetic characteristics, that is, high magnetic flux density (B8): 1.92 ( T) The grain-oriented electrical steel sheet having the above characteristics is manufactured.
【００１１】[0011]
【発明の実施の形態】以下に本発明をさらに詳細に説明
する。図１は本発明に用いられる通電加熱装置の一例を
模式的に示したもので、通電ロールは２対で構成されて
いる。すなわち、押えロール３と対になっている低温側
通電ロール１と、押えロール４と対になっている高温側
通電ロール２とは導電性部材５で接続され、ストリップ
６を通板しながら急速加熱する。７は通電ロール１，２
間に設けた上下１対のピンチロールであり、ストリップ
５を挟んで通板する。この通電加熱装置は脱炭焼鈍炉に
近接して一連に、或いはオフラインに設けるか、若しく
は脱炭焼鈍の昇温工程に組み込んでも良い。工程省略の
観点からは後者の方法が好ましい。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below. FIG. 1 schematically shows an example of an electric heating device used in the present invention, in which the electric current roller is composed of two pairs. That is, the low-temperature side energizing roll 1 paired with the pressing roll 3 and the high-temperature side energizing roll 2 paired with the pressing roll 4 are connected by the conductive member 5, and the strip 6 is rapidly passed through while passing through. To heat. 7 is energizing rolls 1 and 2
It is a pair of upper and lower pinch rolls provided between the strips, and the strip 5 is sandwiched between the pinch rolls. This electric heating device may be provided in series in the vicinity of the decarburization annealing furnace, or may be provided off-line, or may be incorporated in the temperature rising step of the decarburizing annealing. The latter method is preferable from the viewpoint of omitting steps.
【００１２】本発明の通電加熱方法においては、ストリ
ップを通電ロール間で上・下方向からピンチロールで挟
みながら通板するに際し、ロールピンチする通板ストリ
ップの温度条件を適性に選択することにより、通板スト
リップの形状と共に製品の磁気特性を向上させる点に特
徴がある。In the current-carrying heating method of the present invention, when the strips are passed between the current-carrying rolls while being sandwiched by the pinch rolls from above and below, the temperature conditions of the roll-pinching strips are appropriately selected. It is characterized by improving the magnetic properties of the product as well as the shape of the strip.
【００１３】通電ロール間で加熱されるストリップは、
高温側通電ロールの出側で再結晶温度以上の高温となる
ので、低温側の通電ロールから高温側のロールへストリ
ップは通電加熱されながら搬送される間に板波が発生す
ることがある。これはストリップが通電加熱と共に膨脹
するため、波打ち現象を起こすものと推察されるが、本
発明ではピンチロールでストリップを上・下方向から挟
持しながら通板するため、発生した波を矯正する。従っ
て、高温側通電ロールに通るストリップに噛み込みなど
による形状不良は発生しなくなる。この際ストリップは
高温側通電ロール近くの方が高温に加熱されるため、該
ロール近傍にピンチロールを配置するのが好ましい。ま
た、ストリップを挟んでピンチロールは上下に押下げ、
或いは押上げる操作をすることもできる。The strip heated between the current-carrying rolls is
Since the temperature becomes higher than the recrystallization temperature on the exit side of the high temperature side energizing roll, a strip wave may be generated while the strip is being energized and heated while being conveyed from the low temperature side energizing roll to the high temperature side roll. This is presumed to cause a waving phenomenon because the strip expands with heating by energization. However, in the present invention, the pinch rolls the strip while sandwiching the strip from above and below to correct the generated wave. Therefore, the defective shape due to the biting of the strip passing through the high temperature side energizing roll does not occur. At this time, since the strip is heated to a higher temperature near the high temperature side energizing roll, it is preferable to dispose a pinch roll near the roll. Also, pinch rolls are pushed down vertically across the strip,
Alternatively, it can be pushed up.
【００１４】一方、一次再結晶開始温度以上に加熱され
たストリップをピンチすることは、再結晶過程へ影響を
及ぼし、仕上焼鈍時の二次再結晶生成を不安定にする。
そのためにピンチロールでピンチする部分のストリップ
温度は一次再結晶開始温度以下とすべきであり、すなわ
ち、ほぼ７５０℃以下とすれば良く、これにより一次再
結晶集合組織への悪影響を及ぼすことはなくなる。On the other hand, pinching the strip heated above the primary recrystallization start temperature affects the recrystallization process and makes secondary recrystallization formation during finish annealing unstable.
Therefore, the strip temperature of the portion pinched by the pinch roll should be lower than the primary recrystallization start temperature, that is, approximately 750 ° C. or lower, which will not adversely affect the primary recrystallization texture. .
【００１５】また、ピンチロールは通常カーボンロール
が使用されているが、ストリップとの接触で抜熱がおこ
りストリップ温度が降下する。この一次再結晶開始温度
以上のストリップの温度降下量が大き過ぎると、急速加
熱による一次再結晶集合組織の改善効果に影響があり、
二次再結晶にばらつきを生じて磁気特性を劣化する。す
なわち、一次再結晶開始温度（ほぼ７５０℃）以上であ
ってもストリップ温度降下量は小さくしなければなら
ず、そのために５０℃以内に止める必要がある。ストリ
ップからの抜熱を防ぐためには、ピンチロールの表面に
断熱性の高い材料を被覆すれば良く、例えば、ＺｒＯ2
−Ｚｒ・ＳｉＯ2 を溶射被覆することによって達成され
る。Further, although carbon rolls are usually used as the pinch rolls, heat is removed by contact with the strips and the strip temperature drops. If the temperature drop amount of the strip above the primary recrystallization start temperature is too large, the effect of improving the primary recrystallization texture by rapid heating is affected,
Variation in secondary recrystallization causes deterioration of magnetic properties. That is, even if the temperature is higher than the primary recrystallization start temperature (approximately 750 ° C.), the strip temperature drop amount must be small, and for that reason, it is necessary to stop the temperature within 50 ° C. In order to prevent heat removal from the strip, it is sufficient to coat the surface of the pinch roll with a material having a high heat insulating property. For example, ZrO 2
It is achieved by the -zr · SiO 2 to spray coating.
【００１６】このように本発明においてはピンチロール
設置部分のストリップ温度、或いはストリップ温度降下
量のいずれか、または両方を適性に規制することによ
り、磁気特性の向上を図ることができる。As described above, in the present invention, the magnetic characteristics can be improved by appropriately controlling either the strip temperature of the pinch roll installation portion, the strip temperature drop amount, or both.
【００１７】以下に本発明の製造工程をさらに詳細に説
明する。先ず鋼成分の限定理由は下記の通りである。Ｃ
の含有は０．１０％以下とする。これ以上多くなると脱
炭所要時間が長くなり、経済的に不利となるからであ
る。Ｓｉは鉄損を良くするために下限を２．５％とする
が、多過ぎると冷間圧延の際に割れ易く加工が困難とな
るので７．０％を上限とする。The manufacturing process of the present invention will be described in more detail below. First, the reasons for limiting the steel composition are as follows. C
Is 0.10% or less. This is because if the amount exceeds this, the time required for decarburization becomes long, which is economically disadvantageous. Si has a lower limit of 2.5% in order to improve iron loss, but if it is too much, it easily cracks during cold rolling and it becomes difficult to work, so 7.0% is made the upper limit.
【００１８】さらに、一方向性電磁鋼板を製造するため
に、通常のインヒビター成分として以下の成分元素を添
加する。インヒビターとしてＭｎとＳを添加する。Ｍｎ
は、ＭｎＳの適当な分散状態を得るため、０．０１５〜
０．１５％とする。ＳはＭｎＳ，（Ｍｎ・Ｆｅ）Ｓを形
成するために必要な元素で、適当な分散状態を得るた
め、０．００１〜０．０５％とする。Ｓの代わりにＳｅ
を添加しても良く、また両方添加しても良い。Furthermore, in order to produce a grain-oriented electrical steel sheet, add the following component elements as ordinary inhibitor components. The addition of M n and S as an inhibitor. Mn
Is 0.015 to obtain an appropriate dispersed state of MnS.
And 0.15%. S is MnS, an element necessary for forming the (Mn · Fe) S, to obtain a proper dispersion state, and 0.001 to 0.05%. Se instead of S
May be added, or both may be added.
【００１９】さらに、インヒビターとして酸可溶性Ａｌ
とＮを添加する。酸可溶性ＡｌはＡｌＮの適正な分散状
態を得るため０．０１〜０．０４％とする。Ｎも、Ａｌ
Ｎを得るため０．００３〜０．０２％とする。Further, acid-soluble Al as an inhibitor
And N are added. Acid-soluble Al is a 0.01 to 0.04% to obtain a proper dispersion state of AlN. N is also Al
To obtain N, the content is set to 0.003 to 0.02%.
【００２０】その他、Ｃｕ，Ｓｎ，Ｓｂ，Ｃｒ，Ｂｉ，
Ｍｏはインヒビターを強くする目的で１．０％以下にお
いて少なくとも１種添加しても良い。In addition, Cu, Sn, Sb, Cr, Bi,
At least one Mo may be added in an amount of 1.0% or less for the purpose of strengthening the inhibitor.
【００２１】次に、上記したような成分を含有する溶鋼
を通常の鋳塊鋳造法または連続鋳造法で鋳片とし、これ
を熱間圧延して中間厚のストリップを得る。また、スト
リップ鋳造法も本発明に適用することも可能である。Next, molten steel containing the above components is cast into a slab by an ordinary ingot casting method or a continuous casting method, which is hot-rolled to obtain an intermediate-thickness strip. The strip casting method can also be applied to the present invention.
【００２２】次に、熱延板焼鈍を施した後、１回乃至中
間焼鈍を含む２回以上の冷間圧延により最終製品厚のス
トリップを得る。または、熱延板焼鈍を施すことなく、
中間焼鈍を含む２回以上の冷間圧延により最終製品厚の
ストリップを得ることもできる。中間焼鈍を含む２回以
上の冷間圧延をする際の、一回目の圧延は圧下率５〜５
０％、熱延板焼鈍および中間焼鈍は９５０〜１２００℃
で３０秒〜３０分の焼鈍を行うことが望ましい。次の最
終冷延は圧下率８５％以上で行うのが望ましい。下限８
５％は、これ以下では｛１１０｝＜００１＞方位が圧延
方向に高い集積度をもつゴス核が得られないからであ
る。Next, after hot-rolled sheet annealing, a strip having a final product thickness is obtained by cold rolling one or more times including intermediate annealing. Or, without applying hot-rolled sheet annealing,
It is also possible to obtain a strip of final product thickness by cold rolling two or more times with intermediate annealing. When performing cold rolling twice or more including intermediate annealing, the first rolling is a reduction ratio of 5 to 5.
0%, hot-rolled sheet annealing and intermediate annealing 950-1200 ° C
It is desirable to anneal for 30 seconds to 30 minutes. It is desirable that the subsequent final cold rolling is performed at a rolling reduction of 85% or more. Lower limit 8
The reason for 5% is that below this, a Goss nucleus having a {110} <001> orientation with a high degree of integration in the rolling direction cannot be obtained.
【００２３】なお、冷間圧延工程では、冷間圧延中に複
数回のパスにより各板厚段階を経て最終板厚となるが、
磁気特性を向上させるため、そのパスの少なくとも一回
以上の途中板厚段階において、鋼板に１００℃以上の温
度範囲で１分以上の時間保持する熱効果を与えても構わ
ない。In the cold rolling process, the final sheet thickness is obtained by passing through each sheet thickness step by a plurality of passes during the cold rolling.
In order to improve the magnetic properties, the steel plate may be subjected to a thermal effect of holding the steel plate in a temperature range of 100 ° C. or more for a time of 1 minute or more in at least one or more intermediate thickness steps of the pass.
【００２４】以上の最終製品厚まで圧延されたストリッ
プには、脱炭焼鈍前、或いは脱炭焼鈍の昇温過程で、前
記したように通電ロール間にピンチロールを配置した通
電加熱装置で急速加熱処理を施す。この急速加熱処理
は、ストリップを１００℃／秒以上の加熱速度で一次再
結晶生成温度である７５０℃以上の温度へ加熱すること
が好ましい。これにより二次再結晶の核となる一次再結
晶後での｛１１０｝＜００１＞方位粒が分散生成し、微
細な二次再結晶粒が得られるからである。The strip rolled to the above final product thickness is rapidly heated by the electric heating device in which the pinch rolls are arranged between the electric current rolls as described above before the decarburization annealing or in the temperature rising process of the decarburization annealing. Apply processing. In this rapid heat treatment, it is preferable to heat the strip at a heating rate of 100 ° C./sec or more to a temperature of 750 ° C. or more which is the primary recrystallization formation temperature. This is because the {110} <001> oriented grains after the primary recrystallization, which are the nuclei of the secondary recrystallization, are dispersed and generated, and fine secondary recrystallized grains are obtained.
【００２５】この後は、湿水素雰囲気中で脱炭焼鈍を行
う。このとき製品での磁気特性を劣化させないために炭
素は２０ppm 以下に低減されなければならない。ここ
で、熱延でのスラブ加熱温度を低温とし、ＡｌＮのみを
インヒビターとして利用するプロセスの場合は、アンモ
ニア雰囲気中で窒化処理を付加することもある。After that, decarburization annealing is performed in a wet hydrogen atmosphere. At this time, carbon must be reduced to 20 ppm or less so as not to deteriorate the magnetic properties of the product. Here, in the case of a process in which the slab heating temperature in hot rolling is low and only AlN is used as an inhibitor, nitriding treatment may be added in an ammonia atmosphere.
【００２６】さらに、ＭｇＯ等の焼鈍分離剤を塗布し
て、二次再結晶と純化のため１１００℃以上の仕上げ焼
鈍を行うことで、フォルステライトなどの良好な皮膜を
鋼板表面に形成した微細な二次再結晶粒を得る。Further, by applying an annealing separator such as MgO and performing final annealing at 1100 ° C. or higher for secondary recrystallization and purification, a fine film such as forsterite is formed on the surface of the steel sheet. Obtain secondary recrystallized grains.
【００２７】以上、フォルステライトなどの皮膜の上
に、さらに絶縁皮膜を塗布することにより極めて低い鉄
損特性を有する一方向性電磁鋼板が製造される。以上の
磁気特性は、後の歪み取り焼鈍を施しても、変化しない
低鉄損を保持している。なお、得られた製品で、さらに
鉄損を良好にするため、上記一方向性電磁鋼板に、磁区
を細分化するための処理を施すことも可能である。As described above, a unidirectional electrical steel sheet having extremely low iron loss characteristics is manufactured by further applying an insulating film on the film of forsterite or the like. The above-mentioned magnetic characteristics maintain a low iron loss that does not change even after the subsequent strain relief annealing. In addition, in order to further improve the iron loss in the obtained product, the unidirectional electrical steel sheet may be subjected to a treatment for subdividing the magnetic domains.
【００２８】[0028]
【実施例】次に本発明の実施例を説明する。Ｃ：０．０
７８％、Ｓｉ：３．２５％、Ｍｎ：０．０８％、Ｐ：
０．０１％、Ｓ：０．０３％、Ａｌ：０．０３％、Ｎ：
０．００９％、Ｃｕ：０．０８％、Ｓｎ：０．１％、残
部が実質的にＦｅよりなる連続鋳造法で製造したスラブ
を熱間圧延して２．３mmの熱延板とし、該熱延板を１１
２０℃×２分の焼鈍を施した後、冷間圧延で板厚０．２
２mmの冷延板を製造した。この冷延板を８４０℃×１８
０秒の脱炭焼鈍を行い、焼鈍分離剤塗布後仕上げ焼鈍を
１２００℃×２４時間施した。脱炭焼鈍の加熱段階での
急速加熱は、表１に示すように２対の通電ロール間にピ
ンチロールを設けた通電加熱装置で行った。表１および
図１に各種のロールピンチした板温とロールピンチによ
る板温降下量の関係から、得られた製品の形状性および
磁気特性を示した。EXAMPLES Examples of the present invention will be described below. C: 0.0
78%, Si: 3.25%, Mn: 0.08%, P:
0.01%, S: 0.03%, Al: 0.03%, N:
A slab produced by a continuous casting method in which 0.009%, Cu: 0.08%, Sn: 0.1%, and the balance being substantially Fe is hot-rolled into a hot-rolled sheet of 2.3 mm, Hot rolled plate 11
After annealing at 20 ° C for 2 minutes, cold-roll the sheet to 0.2
A 2 mm cold rolled sheet was produced. This cold rolled sheet is 840 ° C x 18
Decarburization annealing was performed for 0 seconds, and after the annealing separator was applied, finish annealing was performed at 1200 ° C for 24 hours. The rapid heating in the heating stage of the decarburization annealing was performed by an electric heating device having a pinch roll between two pairs of electric rolls as shown in Table 1. Table 1 and FIG. 1 show the shape characteristics and magnetic properties of the obtained products from the relationship between the plate temperature subjected to various roll pinches and the amount of decrease in plate temperature due to roll pinch.
【００２９】[0029]
【表１】 [Table 1]
【００３０】表１においてＮｏ．１〜１０，１３および
１４は本発明例であり、Ｎｏ．１１，１２，１５および
１６は比較例（＊印）である。ピンチ板温（以下単に板
温という）が本発明範囲内であれば、ピンチ板温度降下
量（以下単に降下量という）が規定範囲を外れていても
（Ｎｏ．２，５，８，９）、１．９１以上の高い磁束密
度が得られる。また、降下量が本発明範囲であれば、板
温が規定範囲を外れていても（Ｎｏ．１０，１３，１
４）、同様に磁束密度は高い。両方とも本発明外の比較
例は本発明磁束密度の水準に達していない。尚、ピンチ
ロールを使用した表１の例は全て形状はフラットであっ
た。In Table 1, No. Nos. 1 to 10, 13 and 14 are examples of the present invention. 11, 12, 15 and 16 are comparative examples (marked with *). If the pinch plate temperature (hereinafter simply referred to as plate temperature) is within the range of the present invention, even if the pinch plate temperature drop amount (hereinafter simply referred to as drop amount) is out of the specified range (No. 2, 5, 8, 9) A high magnetic flux density of 1.91 or more can be obtained. Further, if the amount of fall is within the range of the present invention, even if the plate temperature is out of the specified range (No. 10, 13, 1)
4) Similarly, the magnetic flux density is high. In both cases, the comparative examples other than the present invention did not reach the level of the magnetic flux density of the present invention. The examples in Table 1 using pinch rolls were all flat in shape.
【００３１】[0031]
【発明の効果】以上のように、本発明によれば、ピンチ
ロール部位におけるストリップ温度を規制することによ
り、極めて優れた鉄損特性を有する高磁束密度一方向性
電磁鋼板を製造することができるので、産業上に貢献す
るところが極めて大である。As described above, according to the present invention, by controlling the strip temperature at the pinch roll portion, a high magnetic flux density unidirectional electrical steel sheet having extremely excellent iron loss characteristics can be manufactured. Therefore, the contribution to the industry is extremely large.
【図１】本発明の通電加熱装置を模式的に示す図。FIG. 1 is a diagram schematically showing an electric heating device of the present invention.
【図２】通電加熱におけるピンチロール部位の板温およ
び板温降下量と磁束密度との関係を示す図。FIG. 2 is a diagram showing a relationship between a plate temperature and a plate temperature drop amount of a pinch roll portion and a magnetic flux density in electric heating.
１：低温側通電ロール ２：高温側通電ロール ３：押えロール ４：押えロール ５：導電性部材 ６：ストリップ ７：ピンチロール 1: Low temperature side energizing roll 2: High temperature side energizing roll 3: Presser roll 4: Presser roll 5: Conductive member 6: Strip 7: Pinch roll
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小菅 健司 兵庫県姫路市広畑区富士町１番地 新日 本製鐵株式会社 広畑製鐵所内 (56)参考文献 特開 平７−62436（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 9/46 501 C21D 3/04 C21D 8/12 H01F 1/16 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenji Kosuge 1 Fuji-machi, Hirohata-ku, Himeji-shi, Hyogo Nippon Steel Corporation Hirohata Works (56) Reference JP-A-7-62436 (JP, A) ) (58) Fields investigated (Int.Cl. 7 , DB name) C21D 9/46 501 C21D 3/04 C21D 8/12 H01F 1/16
Claims (3)
２．５〜７．０％ならびにＭｎ：０．０１５〜０．１５
％、ＳまたはＳｅ：０．００１〜０．０５％、酸可溶性
Ａｌ：０．０１〜０．０４％、Ｎ：０．００３〜０．０
３％を含み、残余はＦｅおよび不可避的不純物よりなる
鋼について、最終製品厚まで圧延されたストリップを脱
炭焼鈍し、最終仕上焼鈍を施す工程を含む方向性電磁鋼
熱延板の製造方法において、ストリップを脱炭焼鈍する
際に、脱炭焼鈍の前で急速加熱を、中間にピンチロール
を配置した２対の通電ロールを用いて行い、該ピンチロ
ールで挟持する部分のストリップの温度が７５０℃以
下、或いは温度降下量が５０℃以内となるかのいずれ
か、または両方を満足するように処理することを特徴と
する極めて優れた磁気特性を有する方向性電磁鋼板の製
造方法。1. C: 0.10% or less by weight, Si:
2.5-7.0% and Mn: 0.015-0.15
%, S or Se: 0.001-0.05%, acid soluble
Al: 0.01 to 0.04%, N: 0.003 to 0.0
In a method for producing a grain-oriented electrical steel hot rolled sheet, which comprises decarburizing annealing of a strip rolled to a final product thickness and performing final finishing annealing for a steel containing 3% and the balance consisting of Fe and inevitable impurities. , when decarburization annealing strips, the rapid heating before decarburization annealing was carried out using two pairs of current supply rolls arranged pinch rolls in the middle, the temperature of the strip portion for clamping in the pinch rolls Either 750 ° C or less, or the amount of temperature drop is within 50 ° C
Or a method of manufacturing a grain-oriented electrical steel sheet having extremely excellent magnetic properties, which is characterized in that it is treated so as to satisfy both or both.
高温側通電ロール近傍に配置されていることを特徴とす
る請求項１記載の極めて優れた磁気特性を有する方向性
電磁鋼板の製造方法。2. A directional electromagnetic having excellent magnetic properties according to claim 1, wherein the pinch rolls, characterized in that it is arranged <br/> temperature side current role near neighbor than the low temperature side conductive rolls Steel plate manufacturing method.
行われることを特徴とする、請求項１または２記載の極
めて優れた磁気特性を有する方向性電磁鋼板の製造方
法。 3. Rapid heating is a heating step of decarburization annealing.
3. The pole according to claim 1 or 2, characterized in that
For producing grain-oriented electrical steel sheets with outstanding magnetic properties
Law.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09932397A JP3392698B2 (en) | 1997-04-16 | 1997-04-16 | Method for manufacturing grain-oriented electrical steel sheet with extremely excellent magnetic properties |
| CN98800664A CN1088475C (en) | 1997-04-16 | 1998-01-09 | Unidirectional electromagnetic steel sheet having excellent film characteristics and magnetic characteristics, its production method and decarburization annealing setup therefor |
| DE69840740T DE69840740D1 (en) | 1997-04-16 | 1998-01-09 | UNIDIRECTIONAL ELECTROMAGNETIC STEEL PLATE WITH OUTSTANDING FILM AND MAGNETIC PROPERTIES, METHOD OF PRODUCTION AND COOLING CONDITIONING THEREFOR |
| EP98900194A EP0926250B1 (en) | 1997-04-16 | 1998-01-09 | Grain-oriented electromagnetic steel sheet having excellent film characteristics and magnetic characteristics, its production method and decarburization annealing setup therefor |
| KR1019980710317A KR100293141B1 (en) | 1997-04-16 | 1998-01-09 | A unidirectional electric steel sheet excellent in film properties and magnetic properties, a method of manufacturing the same, and a decarburization annealing facility |
| PCT/JP1998/000052 WO1998046803A1 (en) | 1997-04-16 | 1998-01-09 | Unidirectional electromagnetic steel sheet having excellent film characteristics and magnetic characteristics, its production method and decarburization annealing setup therefor |
| US09/202,511 US6395104B1 (en) | 1997-04-16 | 1998-01-09 | Method of producing unidirectional electromagnetic steel sheet having excellent film characteristics and magnetic characteristics |
| US10/108,064 US6635125B2 (en) | 1997-04-16 | 2002-03-27 | Grain-oriented electrical steel sheet excellent in film characteristics and magnetic characteristics, process for producing same, and decarburization annealing facility used in same process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09932397A JP3392698B2 (en) | 1997-04-16 | 1997-04-16 | Method for manufacturing grain-oriented electrical steel sheet with extremely excellent magnetic properties |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10287925A JPH10287925A (en) | 1998-10-27 |
| JP3392698B2 true JP3392698B2 (en) | 2003-03-31 |
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ID=14244437
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|---|---|---|---|
| JP09932397A Expired - Fee Related JP3392698B2 (en) | 1997-04-16 | 1997-04-16 | Method for manufacturing grain-oriented electrical steel sheet with extremely excellent magnetic properties |
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| CN110832113B (en) * | 2017-07-13 | 2022-08-02 | 日本制铁株式会社 | Grain-oriented electromagnetic steel sheet |
| KR20200120676A (en) * | 2018-03-30 | 2020-10-21 | 제이에프이 스틸 가부시키가이샤 | Grain-oriented electrical steel sheet manufacturing equipment |
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|---|---|
| JPH10287925A (en) | 1998-10-27 |
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