JP3890011B2 - Method for producing grain-oriented electrical steel sheet - Google Patents
Method for producing grain-oriented electrical steel sheet Download PDFInfo
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- JP3890011B2 JP3890011B2 JP2002352726A JP2002352726A JP3890011B2 JP 3890011 B2 JP3890011 B2 JP 3890011B2 JP 2002352726 A JP2002352726 A JP 2002352726A JP 2002352726 A JP2002352726 A JP 2002352726A JP 3890011 B2 JP3890011 B2 JP 3890011B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
【０００１】
【発明の属する技術分野】
本発明は、電気産業分野での変圧器等のコアに使用される一方向性電磁鋼板の製造方法に関わる。特に、地球環境問題を解決する一方向性電磁鋼板の製造方法を提供する。
【０００２】
【従来の技術】
近年、地球環境の観点から、スクラップのリサイクルが大きな課題となってきた。このため、製鉄業でいえば、鉄鉱石を高炉で還元した溶銑を製鋼原料として使用する方法から、自動車や空き缶などのスクラップを消費する製鋼法に転換する動きが始まっている。
【０００３】
しかしながら、例えば自動車の成分組成に関して言えば、エンジンやバッテリーなどの部品を除いた標準プレス品では、Ｃｕ量が１％以上もあり、このことがリサイクルへのネックになっている。なぜなら、従来はプレス品素材にＣｕ量が０．３％以上含有すると、熱延中に鋼板表面で脆化割れが生じ、最終製品で表面疵として残存し、鉄鋼製品とはならなかった。自動車のプレス品にＣｕ含有量が多いのは、モータなどの電装部品の数が多く、この電装部品が銅線のためである。
【０００４】
例えば特許文献１では、Ｃｕ：０．２０％未満を含有させ、γ−α変態に伴う、５００Å以下の微細な（Ｃｕ，Ｍｎ）1.8Ｓを析出させることを特徴とする低鉄損一方向性電磁鋼板の製造方法が開示されているが、０．２％以上のＣｕ量に対しては方策がなかった。
【０００５】
また特許文献２には、Ｓ又はＳｅを単独量又は合計量で０．００５〜０．０５％と、Ａｓ，Ｂｉ，Ｐｂ，Ｐ，Ｓｎよりなる群から選んだ元素の１種又は２種以上を単独量又は合計量で０．０１５〜０．０５％、あるいはＮｉ，Ｃｕより成る群から選んだ元素の１種又は２種を単独量又は合計量で０．２〜１．０％を含有して、８００〜９５０℃の範囲で２次再結晶粒を十分発達させる技術が開示されている。しかし、０．２％超のＣｕ量に対してＣｕ脆化抑制方策が十分で無かった。
【０００６】
【特許文献１】
特開昭６１−１２８２２号公報
【特許文献２】
特公昭５４−３２４１２号公報
【０００７】
【発明が解決しようとする課題】
本発明は上記の点に鑑み、鉄スクラップ特にシュレッダーダスト（ＡＳＲ）を多量消費する道を切り開き、且つ、脆性問題を解消しつつ、従前の優れた磁気特性を有する一方向性電磁鋼板の製造方法を提供する。
【０００８】
【課題を解決するための手段】
すなわち、本発明は、
（１）質量％で、
Ｃ ≦０．０９％、 Ｓｉ：２．０〜４．０％、
Ｍｎ：０．０３〜０．１２％、 Ｓ ：０．０１５〜０．０３５％、
Ｃｕ：０．２〜３．０％
とし、残部Ｆｅおよび不可避的成分を含有するスラブを、不活性ガス或いはこれに一部水素を添加した雰囲気中において、雰囲気制御型電気式加熱炉で１２５０℃以上にスラブ加熱し、熱間圧延して熱延板となし、１回ないし中間焼鈍を含んだ２回以上の冷間圧延をし、引き続き脱炭焼鈍を行い、高温焼鈍を行う一方向性電磁鋼板の製造方法において、前記Ｃｕはシュレッダーダスト中のＣｕ成分から添加されることを特徴とする一方向性電磁鋼板の製造方法であり、
（２）質量％で、
Ｃ ≦０．０９％、 Ｓｉ：２．０〜４．０％、
Ｍｎ：０．０３〜０．１２％、 Ｓ ：０．０１５〜０．０３５％、
酸可溶Ａｌ：０．０１〜０．０５％、 Ｎ ：０．００４５〜０．１％、
Ｃｕ：０．２〜３．０％
とし、残部Ｆｅおよび不可避的成分を含有するスラブを、不活性ガス或いはこれに一部水素を添加した雰囲気中において、雰囲気制御型電気式加熱炉で１２５０℃以上にスラブ加熱し、熱間圧延して熱延板となし、熱延板焼鈍を施し、１回ないし中間焼鈍を挟んだ２回以上の冷間圧延をし、引き続き脱炭焼鈍を行い、高温焼鈍を行う一方向性電磁鋼板の製造方法において、前記Ｃｕはシュレッダーダスト中のＣｕ成分から添加されることを特徴と
する一方向性電磁鋼板の製造方法である。
【０００９】
本発明の新しさは、以下の２つのポイントとなる発見から構成されると考える。一点目は、Ｃｕ量が０．２％以上でも熱延スラブ加熱条件を特定することにより、熱延中の表面割れによる疵が発生しない。二点目は、この表面疵が発生しないＣｕ量は、廃棄物中のＣｕ成分から添加することにより得られることにある。
【００１０】
【発明の実施の形態】
以下、本発明を詳細に説明する。成分含有量は質量％である。
Ｃ量は０．０９％以下とする。０．０９％を超すＣ量では、後の脱炭焼鈍での脱炭不良の可能性があり、磁気時効に問題があるためである。
【００１１】
Ｓｉ量は２．０〜４．０％とする。Ｓｉ量が４．０％超では脆性の問題があり、２．０％未満では必要な鉄損特性が得られないからである。
【００１２】
Ｍｎ量は０．０３〜０．１２％とする。Ｍｎは（Ｃｕ，Ｍｎ）Ｓの析出コントロールを行うために必要な元素で、Ｍｎ量が０．０３％未満又は０．１２％超になると、熱延工程、中間焼鈍工程での（Ｃｕ，Ｍｎ）Ｓの適切なコントロールをすることが困難となり、必要な鉄損特性が得られないからである。
【００１３】
Ｓ量は０．０１５〜０．０３５％とする。Ｓ量は、０．０１５％未満では必要な（Ｃｕ，Ｍｎ）Ｓが得られず、Ｓ量が０．０３５％を超えると、ＭｎＳやＣｕ2Ｓまたは（Ｍｎ，Ｃｕ）1.8Ｓ型の複合硫化物が増えすぎて、鉄損が劣化するからである。
【００１４】
酸可溶Ａｌ量は０．０１〜０．０５％とする。酸可溶ＡｌはＡｌＮの形態で鋼板中に析出しており、所期の鉄損を得るための二次再結晶のインヒビターとして作用する。酸可溶Ａｌ量が０．０１％未満では必要量のＡｌＮが得られず、また０．０５％を超えると所望の析出形態を得られず、ともに所期の鉄損を得ることができない。
【００１５】
Ｎ量は上記のＡｌＮの析出量に影響し、０．００４５％未満であると必要量に足りない。またＮ量が、０．１％を超えると鋳造中に欠陥を生ずるために０．１％までとした。
【００１６】
Ｃｕ量は０．２〜３％に制限する。Ｃｕ量の下限を０．２％以上としたのは、シュレッダーダストを積極的に活用するには０．２％以上のＣｕ量が必要となるためである。また３％超では、スクラップ以外のＣｕ原料を添加する必要があり、コストアップになるため避ける。
【００１７】
なお本発明において、上記Ｃｕ添加については、必要なＣｕ量の全部又は一部を廃棄物中のＣｕ成分から添加することが好ましい。一般に製鋼工程では、高炉からの溶鋼に対し必要な成分を添加することが通常であるが、本発明においてはスクラップを主体とした溶鋼から必要な成分を得ることが好ましい。この時、特にＣｕ成分の調整については、スクラップの他に、廃棄物中のＣｕ成分から添加することが望ましい。廃棄物とは、廃車、廃家電製品から分別、回収されたものをいい、シュレッダーダスト（ＡＳＲ）等のＣｕ成分を多く含むものが代表例として挙げられる。また、廃車、廃家電製品も本発明の範囲内である。
【００１８】
上記、廃棄物中に含まれるＣｕを用いることにより、後の熱延工程での熱間脆性問題が解決される。その詳細は不明であるが、シュレッダーダスト中に含まれる樹脂成分などが原因で、後のＣｕ分散性が均一になることが主要な原因と予測される。またこの分散性は、更にはインヒビターの分散性にも影響し、良好な鉄損特性が得られるものと予測される。
【００１９】
熱延のスラブ加熱は、温度を１２５０℃以上に制限する。１２５０℃未満では硫化物の溶体化が不充分なためである。また、Ｃｕによる脆化が大きくなるため避けなければならない。このため、雰囲気制御型電気式加熱炉でスラブ加熱することが必要である。雰囲気としては窒素、アルゴンなどの不活性ガス中、或いはこれらに一部水素を添加しても構わない。その理由は未だ明確ではないが、Ｃｕを含む成分系でのスケールの形成量が、上記雰囲気型電気式加熱炉にすると急激に激減することに関係していると考えている。
【００２０】
次いで通常の熱間圧延を行う。熱延板以降の工程については、従来の一方向性電磁鋼板の製造工程のものを採用することができる。
【００２１】
なお、インヒビターとしてＡｌＮを使用する場合、冷間圧延が１回の場合には熱延板焼鈍を施す。
冷間圧延が２回の場合では、上記熱延板を酸洗した後、次いで通常の一回目の冷延を施す。次いで中間焼鈍し、引き続き２回目の冷間圧延を施し、製品板厚とする。
得られた冷延板について湿水素雰囲気中にて脱炭し、ＭｇＯを塗布後、高温焼鈍を実施することにより一方向性電磁鋼板が得られる。
【００２２】
以下、本発明の実施例について説明する。
【実施例】
（実施例１）
表１に示す成分を持つ厚み２５０ｍｍの鋼スラブを溶製した。１３５０℃にスラブ加熱した後、熱間圧延して板厚２．３ｍｍに仕上げた。
なお、試料符号５の鋼中のＣｕ添加については、廃車のシュレッダーダスト（ＡＳＲ）から添加したものと、通常の合金元素を添加したものについて比較検討した。また、スラブ加熱については、ガス加熱炉の場合と雰囲気制御型電気式加熱炉（雰囲気制御）の場合について比較検討した。
得られた熱延板の脆性状態を表２に示す。耳割れ深さ５ｍｍ以内を○合格とした。表２から、本発明により良好な熱延板が得られていることがわかる。
【００２３】
以降の熱延板については、試料符号１〜５の成分全て、Ｃｕは廃車のシュレッダーダスト（ＡＳＲ）から添加し、スラブ加熱については雰囲気制御型電気式加熱炉により実施した。
この熱延板を板厚０．８０ｍｍまで冷間で圧延し、１０００℃で５０secの中間焼鈍を施した後、さらに板厚０．３０ｍｍまで冷間圧延した。この冷延板に８３０℃で２分間の一次再結晶と脱炭を目的とした焼鈍を施し、鋼板表面にＭｇＯの焼鈍分離剤を塗布した後、１１８０℃で２０時間の二次再結晶を目的とする焼鈍を施した。以上の工程で得られた方向性電磁鋼板の磁気特性を表３に示す。
表３より、試料符号３、４、５の鉄損が他の試料に較べて優れていることが解る。
【００２４】
【表１】
【表２】
【表３】
（実施例２）
表４に示す成分を持つ厚み２５０ｍｍの鋼スラブを溶製し、１３００℃に加熱した後、熱間圧延して板厚２．２ｍｍに仕上げた。上記において試料符号６〜１０の成分全て、鋼中のＣｕは廃車のシュレッダーダスト（ＡＳＲ）から添加し、スラブ加熱については雰囲気制御型電気式加熱炉により実施した。得られた熱延板の耳割れについては、最大深さ何れも５ｍｍ以内で良好であった。
この熱延板を板厚０．８３ｍｍまで冷間で圧延し、９００℃で１分間の中間焼鈍を施した後、０．３０ｍｍの厚みまで冷間圧延した。この冷延板に８４０℃で２分間の一次再結晶と脱炭を目的とした焼鈍を施し、鋼板表面にＭｇＯの焼鈍分離剤を塗布した後、１２００℃で２０時間の二次再結晶を目的とする焼鈍を施した。以上の工程で得られた方向性電磁鋼板の磁気特性を表５に示す。
表５より、試料符号８、９、１０の鉄損が他の試料に較べて優れていることが解る。
【００２８】
【表４】
【表５】
【発明の効果】
以上の如く本発明によれば、鉄スクラップを有効活用して、熱間脆性と磁気特性が優れた一方向性電磁鋼板を製造することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a unidirectional electrical steel sheet used for a core such as a transformer in the electric industry field. In particular, a method for producing a unidirectional electrical steel sheet that solves global environmental problems is provided.
[0002]
[Prior art]
In recent years, scrap recycling has become a major issue from the viewpoint of the global environment. For this reason, in the steel industry, there has been a movement to shift from a method of using hot metal obtained by reducing iron ore in a blast furnace as a raw material for steelmaking to a method of steelmaking that consumes scrap such as automobiles and empty cans.
[0003]
However, with regard to the composition of automobile components, for example, standard press products excluding parts such as engines and batteries have a Cu content of 1% or more, which is a bottleneck for recycling. Because, conventionally, when the amount of Cu contained in the pressed product material is 0.3% or more, embrittlement cracking occurs on the surface of the steel plate during hot rolling, and it remains as a surface flaw in the final product and does not become a steel product. The reason why the amount of Cu contained in an automobile press product is large is that there are a large number of electrical components such as motors, and this electrical component is due to copper wires.
[0004]
For example, Patent Document 1 contains Cu: less than 0.20%, and precipitates fine (Cu, Mn) 1.8 S of 500 μm or less accompanying the γ-α transformation. Although a method for manufacturing an electrical steel sheet has been disclosed, there was no measure for a Cu content of 0.2% or more.
[0005]
Patent Document 2 discloses that S or Se is 0.005 to 0.05% in a single or total amount, and one or more elements selected from the group consisting of As, Bi, Pb, P, and Sn. In an amount of 0.015 to 0.05% in a single amount or in a total amount, or one or two elements selected from the group consisting of Ni and Cu in a single amount or in a total amount of 0.2 to 1.0% And the technique which fully develops a secondary recrystallized grain in the range of 800-950 degreeC is disclosed. However, a measure for suppressing Cu embrittlement was not sufficient for a Cu content exceeding 0.2%.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 61-12822 [Patent Document 2]
Japanese Patent Publication No. 54-32412 [0007]
[Problems to be solved by the invention]
In view of the above, the present invention opens a way to consume a large amount of iron scrap, particularly shredder dust (ASR) , and solves the brittleness problem, while producing a conventional unidirectional electrical steel sheet having excellent magnetic properties. I will provide a.
[0008]
[Means for Solving the Problems]
That is, the present invention
(1) In mass%,
C ≦ 0.09%, Si: 2.0 to 4.0%,
Mn: 0.03-0.12%, S: 0.015-0.035%,
Cu: 0.2-3.0%
The slab containing the remaining Fe and inevitable components is slab heated to 1250 ° C. or higher in an atmosphere containing an inert gas or a part of which hydrogen is added , and is hot-rolled. In the method for producing a unidirectional electrical steel sheet, which is hot-rolled sheet, cold-rolled twice or more including intermediate annealing, followed by decarburization annealing, and high-temperature annealing, the Cu is a shredder A method for producing a unidirectional electrical steel sheet characterized by being added from a Cu component in dust ,
(2) In mass%,
C ≦ 0.09%, Si: 2.0 to 4.0%,
Mn: 0.03-0.12%, S: 0.015-0.035%,
Acid-soluble Al: 0.01 to 0.05%, N: 0.0045 to 0.1%,
Cu: 0.2-3.0%
The slab containing the remaining Fe and inevitable components is slab heated to 1250 ° C. or higher in an atmosphere containing an inert gas or a part of which hydrogen is added , and is hot-rolled. Production of a unidirectional electrical steel sheet that is hot-rolled sheet, subjected to hot-rolled sheet annealing, cold-rolled twice or more with one or more intermediate annealings, followed by decarburization annealing and high-temperature annealing In the method, the Cu is added from a Cu component in the shredder dust .
[0009]
The novelty of the present invention is considered to consist of the following two points of discovery. The 1st point does not generate | occur | produce the flaw by the surface crack in hot rolling by specifying hot-rolling slab heating conditions even if Cu amount is 0.2% or more. The second point is that the amount of Cu that does not generate surface defects is obtained by adding from the Cu component in the waste.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail. The component content is% by mass.
The C content is 0.09% or less. This is because if the amount of C exceeds 0.09%, there is a possibility of decarburization failure in subsequent decarburization annealing, and there is a problem in magnetic aging.
[0011]
Si amount is set to 2.0 to 4.0%. This is because when the Si content exceeds 4.0%, there is a problem of brittleness, and when it is less than 2.0%, necessary iron loss characteristics cannot be obtained.
[0012]
The amount of Mn is 0.03 to 0.12%. Mn is an element necessary for controlling the precipitation of (Cu, Mn) S. When the amount of Mn is less than 0.03% or more than 0.12%, (Cu, Mn) in the hot rolling process and the intermediate annealing process. This is because it becomes difficult to appropriately control S and the required iron loss characteristics cannot be obtained.
[0013]
S amount is set to 0.015 to 0.035%. If the amount of S is less than 0.015%, the required (Cu, Mn) S cannot be obtained. If the amount of S exceeds 0.035%, a composite of MnS, Cu 2 S or (Mn, Cu) 1.8 S type is used. This is because the amount of sulfide increases and iron loss deteriorates.
[0014]
The amount of acid-soluble Al is 0.01 to 0.05%. The acid-soluble Al is precipitated in the steel sheet in the form of AlN and acts as an inhibitor of secondary recrystallization for obtaining the desired iron loss. If the amount of acid-soluble Al is less than 0.01%, the required amount of AlN cannot be obtained, and if it exceeds 0.05%, a desired form of precipitation cannot be obtained, and the desired iron loss cannot be obtained.
[0015]
The amount of N affects the amount of precipitation of the above AlN, and if it is less than 0.0045%, it is insufficient. Further, if the amount of N exceeds 0.1%, defects occur during casting, so the content was made up to 0.1%.
[0016]
The amount of Cu is limited to 0.2 to 3%. The reason why the lower limit of the amount of Cu is set to 0.2% or more is that an amount of Cu of 0.2% or more is required in order to actively use the shredder dust . If it exceeds 3%, Cu raw materials other than scrap need to be added, which increases the cost and is avoided.
[0017]
In addition, in this invention, about the said Cu addition, it is preferable to add all or one part of required Cu amount from Cu component in waste. In general, in a steelmaking process, it is usual to add necessary components to molten steel from a blast furnace, but in the present invention, it is preferable to obtain necessary components from molten steel mainly composed of scrap. At this time, especially for the adjustment of the Cu component, it is desirable to add from the Cu component in the waste in addition to the scrap. Waste refers to what is separated and collected from scrap cars and waste home appliances, and representative examples include those containing a large amount of Cu components such as shredder dust (ASR) . Also, scrap cars and waste home appliances are within the scope of the present invention .
[0018]
By using Cu contained in the waste, the hot brittleness problem in the subsequent hot rolling process is solved. Although the details are unknown, it is predicted that the subsequent Cu dispersibility becomes uniform due to the resin component contained in the shredder dust. This dispersibility further affects the dispersibility of the inhibitor, and it is predicted that good iron loss characteristics can be obtained.
[0019]
Hot rolling slab heating limits the temperature to 1250 ° C or higher. If the temperature is lower than 1250 ° C., the solution of sulfide is insufficient. Moreover, since embrittlement by Cu becomes large, it must be avoided. For this reason, it is necessary to perform slab heating in an atmosphere controlled electric heating furnace. As an atmosphere, hydrogen may be added in an inert gas such as nitrogen or argon, or a part thereof may be added with hydrogen. The reason for this is not yet clear, but it is considered that the amount of scale formation in the component system containing Cu is related to the drastic reduction when the atmosphere-type electric heating furnace is used.
[0020]
Then, normal hot rolling is performed. About the process after a hot-rolled sheet, the thing of the manufacturing process of the conventional unidirectional electrical steel sheet can be employ | adopted.
[0021]
In addition, when using AlN as an inhibitor, when cold rolling is performed once, hot-rolled sheet annealing is performed.
In the case of cold rolling twice, the hot-rolled sheet is pickled and then subjected to the usual first cold rolling. Next, intermediate annealing is performed, followed by a second cold rolling to obtain a product sheet thickness.
A unidirectional electrical steel sheet is obtained by decarburizing the obtained cold-rolled sheet in a wet hydrogen atmosphere, applying MgO, and then performing high-temperature annealing.
[0022]
Examples of the present invention will be described below.
【Example】
Example 1
A steel slab having a thickness of 250 mm having the components shown in Table 1 was melted. After slab heating to 1350 ° C., it was hot-rolled to a sheet thickness of 2.3 mm.
In addition, about addition of Cu in the steel of the sample code | cord | chord 5, it compared with what added from the shredder dust (ASR) of a scrap car, and the thing which added the normal alloy element. In addition, regarding slab heating, a comparison was made between a gas heating furnace and an atmosphere control type electric heating furnace (atmosphere control).
Table 2 shows the brittle state of the obtained hot-rolled sheet. An ear crack depth of 5 mm or less was regarded as “good”. From Table 2, it can be seen that a good hot rolled sheet is obtained by the present invention.
[0023]
For the subsequent hot-rolled sheets, all the components of sample codes 1 to 5 and Cu were added from the shredder dust (ASR) of the scrap car, and the slab heating was carried out by an atmosphere control type electric heating furnace.
The hot-rolled sheet was cold-rolled to a thickness of 0.80 mm, subjected to intermediate annealing at 1000 ° C. for 50 seconds, and then further cold-rolled to a thickness of 0.30 mm. This cold-rolled sheet was annealed at 830 ° C. for 2 minutes for the purpose of primary recrystallization and decarburization, and after the MgO annealing separator was applied to the steel sheet surface, secondary recrystallization was performed at 1180 ° C. for 20 hours. Annealing was performed. Table 3 shows the magnetic properties of the grain-oriented electrical steel sheet obtained by the above steps.
From Table 3, it can be seen that the iron loss of sample codes 3, 4, and 5 is superior to other samples.
[0024]
[Table 1]
[Table 2]
[Table 3]
(Example 2)
A steel slab having a thickness of 250 mm having the components shown in Table 4 was melted, heated to 1300 ° C., and then hot-rolled to a thickness of 2.2 mm. In the above, all the components of sample codes 6 to 10 and Cu in the steel were added from the shredder dust (ASR) of the scrap car, and the slab heating was performed by an atmosphere control type electric heating furnace. About the ear crack of the obtained hot-rolled sheet, the maximum depth was good within 5 mm.
The hot-rolled sheet was cold-rolled to a thickness of 0.83 mm, subjected to intermediate annealing at 900 ° C. for 1 minute, and then cold-rolled to a thickness of 0.30 mm. This cold-rolled sheet is annealed for the purpose of primary recrystallization and decarburization at 840 ° C. for 2 minutes, and an MgO annealing separator is applied to the steel sheet surface, followed by secondary recrystallization at 1200 ° C. for 20 hours. Annealing was performed. Table 5 shows the magnetic properties of the grain-oriented electrical steel sheet obtained by the above steps.
From Table 5, it can be seen that the iron loss of sample codes 8, 9, and 10 is superior to other samples.
[0028]
[Table 4]
[Table 5]
【The invention's effect】
As described above, according to the present invention, it is possible to produce a unidirectional electrical steel sheet having excellent hot brittleness and magnetic properties by effectively using iron scrap.
Claims (2)
Ｃ ≦０．０９％、
Ｓｉ：２．０〜４．０％、
Ｍｎ：０．０３〜０．１２％、
Ｓ ：０．０１５〜０．０３５％、
Ｃｕ：０．２〜３．０％
とし、残部Ｆｅおよび不可避的成分を含有するスラブを、不活性ガス或いはこれに一部水素を添加した雰囲気中において、雰囲気制御型電気式加熱炉で１２５０℃以上にスラブ加熱し、熱間圧延して熱延板となし、１回ないし中間焼鈍を含んだ２回以上の冷間圧延をし、引き続き脱炭焼鈍を行い、高温焼鈍を行う一方向性電磁鋼板の製造方法において、前記Ｃｕはシュレッダーダスト中のＣｕ成分から添加されることを特徴とする一方向性電磁鋼板の製造方法。% By mass
C ≦ 0.09%,
Si: 2.0-4.0%,
Mn: 0.03 to 0.12%,
S: 0.015-0.035%,
Cu: 0.2-3.0%
The slab containing the remaining Fe and inevitable components is slab heated to 1250 ° C. or higher in an atmosphere containing an inert gas or a part of which hydrogen is added , and is hot-rolled. In the method for producing a unidirectional electrical steel sheet, which is hot-rolled sheet, cold-rolled twice or more including intermediate annealing, followed by decarburization annealing, and high-temperature annealing, the Cu is a shredder A method for producing a unidirectional electrical steel sheet, characterized by being added from a Cu component in dust .
Ｃ ≦０．０９％、
Ｓｉ：２．０〜４．０％、
Ｍｎ：０．０３〜０．１２％、
Ｓ ：０．０１５〜０．０３５％、
酸可溶Ａｌ：０．０１〜０．０５％、
Ｎ ：０．００４５〜０．１％、
Ｃｕ：０．２〜３．０％
とし、残部Ｆｅおよび不可避的成分を含有するスラブを、不活性ガス或いはこれに一部水素を添加した雰囲気中において、雰囲気制御型電気式加熱炉で１２５０℃以上にスラブ加熱し、熱間圧延して熱延板となし、熱延板焼鈍を施し、１回ないし中間焼鈍を挟んだ２回以上の冷間圧延をし、引き続き脱炭焼鈍を行い、高温焼鈍を行う一方向性電磁鋼板の製造方法において、前記Ｃｕはシュレッダーダスト中のＣｕ成分から添加されることを特徴とする一方向性電磁鋼板の製造方法。% By mass
C ≦ 0.09%,
Si: 2.0-4.0%,
Mn: 0.03 to 0.12%,
S: 0.015-0.035%,
Acid-soluble Al: 0.01-0.05%
N: 0.0045 to 0.1%,
Cu: 0.2-3.0%
The slab containing the remaining Fe and inevitable components is slab heated to 1250 ° C. or higher in an atmosphere containing an inert gas or a part of which hydrogen is added , and is hot-rolled. Production of a unidirectional electrical steel sheet that is hot-rolled sheet, subjected to hot-rolled sheet annealing, cold-rolled twice or more with one to intermediate annealing, followed by decarburization annealing and high-temperature annealing In the method, the Cu is added from a Cu component in the shredder dust .
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