JPH0763725B2 - Series of continuous hot rolling equipment for unidirectional electrical steel sheets - Google Patents
Series of continuous hot rolling equipment for unidirectional electrical steel sheetsInfo
- Publication number
- JPH0763725B2 JPH0763725B2 JP3067183A JP6718391A JPH0763725B2 JP H0763725 B2 JPH0763725 B2 JP H0763725B2 JP 3067183 A JP3067183 A JP 3067183A JP 6718391 A JP6718391 A JP 6718391A JP H0763725 B2 JPH0763725 B2 JP H0763725B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- rolling mill
- hot rolling
- rough
- electrical steel
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼板を製造する工程に
おいて、連続鋳造スラブを連続的に熱間圧延する設備列
に関し、特に高温加熱する一方向性電磁鋼用スラブの熱
間圧延方法に適用できて、成品表面欠陥の改善を図りつ
つ、生産性および磁気特性に優れた一方向性電磁鋼板を
得ることを可能とした連続式熱間圧延設備列に係わるも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equipment train for continuously hot rolling a continuously cast slab in a process for producing a steel sheet, and more particularly to a hot rolling method for a slab for unidirectional electrical steel which is heated at a high temperature. The present invention relates to a continuous hot rolling equipment train capable of being applied to obtain a unidirectional electrical steel sheet excellent in productivity and magnetic properties while improving the surface defects of the product.
【０００２】[0002]
【従来の技術】周知の如く、方向性電磁鋼板は、高い磁
束密度と低い鉄損を持つ優れた磁気特性により変圧器な
どの鉄芯材料として広く用いられている。その製造方法
の特徴として、〔１１０〕＜００１＞のいわゆるゴス方
位が高度に集積した二次再結晶粒を得るために、Ｍｎ
Ｓ、ＡｌＮといった粒方向性を制御するインヒビター元
素が用いられている。このインヒビター元素が適性に意
図した作用をもたらすためには、熱間圧延に先立つスラ
ブ加熱時に充分に解離固溶（以下溶体化と呼ぶ）させた
後、適切な条件での熱間圧延と次いで行う冷却によって
微細且つ均一分散析出させることが非常に重要であり、
かかるインヒビターの溶体化には、例えば１３００℃以
上のスラブ高温加熱を行っている。2. Description of the Related Art As is well known, grain-oriented electrical steel sheets are widely used as iron core materials for transformers and the like due to their excellent magnetic characteristics such as high magnetic flux density and low iron loss. As a characteristic of the manufacturing method, in order to obtain secondary recrystallized grains in which the so-called Goss orientation of [110] <001> is highly integrated, Mn
Inhibitor elements such as S and AlN that control the grain orientation are used. In order for this inhibitor element to appropriately bring about the intended action, after sufficiently dissociating and forming a solid solution (hereinafter referred to as solution heat treatment) during slab heating prior to hot rolling, hot rolling is performed under appropriate conditions. It is very important to precipitate finely and uniformly dispersed by cooling,
For solution treatment of such an inhibitor, for example, high temperature heating of the slab at 1300 ° C. or higher is performed.
【０００３】このスラブ高温加熱を行う方法として、ガ
ス燃焼型加熱炉を用いた場合には、加熱炉内で多量の溶
融スケールが発生し、歩留の悪化が生じるだけでなく、
加熱炉の安定した操業性を損なうと共に、成品表面欠陥
や幅方向端部のいわゆる耳割れ欠陥の発生原因となる。
加えて、この種の加熱炉で目標とする温度まで到達させ
るには極めて長時間を要することから、その間にスラブ
組織の粗大化が生じ、その後の圧延で巨大延伸粒を発現
させることになり、その結果成品磁気特性を不安定にさ
せる原因にもなっている。When a gas combustion type heating furnace is used as a method for performing the high temperature heating of the slab, a large amount of molten scale is generated in the heating furnace, which not only deteriorates the yield but also
Not only does this impair the stable operability of the heating furnace, but it also causes defects in the surface of the product and so-called edge cracking defects at the ends in the width direction.
In addition, since it takes an extremely long time to reach the target temperature in this type of heating furnace, coarsening of the slab structure occurs in the meantime, and a huge stretched grain is expressed in the subsequent rolling, As a result, it also causes instability in the magnetic properties of the product.
【０００４】上記の問題点に対して、特開昭６１−６９
９２４号公報、特開昭６１−６９９２７号公報等では、
スラブを１２５０℃程度までガス燃焼型加熱炉で予備加
熱し、その後の高温加熱を、不活性雰囲気に制御された
誘導加熱炉で短時間行うことが提案されている。更に、
特開昭６３−１０９１１５号公報や、特開平１−１６２
７２５号公報等においても同様な高温加熱を、不活性雰
囲気に制御された誘導加熱炉で短時間行う旨が記述され
ており、この様な高温誘導加熱に関して多くの開示があ
る。In order to solve the above problems, Japanese Patent Laid-Open No. 61-69
In Japanese Patent Laid-Open No. 924 and Japanese Patent Laid-Open No. 61-69927,
It has been proposed that the slab is preheated to about 1250 ° C. in a gas combustion type heating furnace, and then the high temperature heating is performed for a short time in an induction heating furnace controlled to an inert atmosphere. Furthermore,
JP-A-63-109115 and JP-A-1-162.
In Japanese Patent No. 725, etc., it is described that similar high temperature heating is performed for a short time in an induction heating furnace controlled to an inert atmosphere, and there are many disclosures regarding such high temperature induction heating.
【０００５】しかしながら、これらの方法によれば熱延
段階での歩留、操業性の点では改善が計れるものの、こ
の内部発熱型の誘導加熱炉を用いた高温急速加熱では、
従来のガス加熱方式と異なり、炉抽出時の温度パターン
が、表面部で最冷点となるため、その後の熱延処理にお
いて、特に熱延板幅方向のエッジ部温度が極めて低下し
やすく、その結果として、インヒビター凝集による２次
再結晶不良となり、磁気特性の劣化が起こり得る。その
ためにスラブエッジ部に対する加熱対策は勿論である
が、誘導加熱炉抽出後速やかに熱延処理を開始しなけれ
ばならない。However, according to these methods, although the yield and operability in the hot rolling stage can be improved, in the high temperature rapid heating using the internal heating type induction heating furnace,
Unlike the conventional gas heating method, the temperature pattern at the time of furnace extraction is the coldest point on the surface, so in the subsequent hot rolling treatment, the edge temperature in the width direction of the hot rolled sheet is extremely likely to decrease, As a result, secondary recrystallization failure due to inhibitor aggregation may occur, resulting in deterioration of magnetic properties. For this reason, it is of course necessary to take measures against heating the slab edge portion, but the hot rolling process must be started immediately after the induction heating furnace is extracted.
【０００６】[0006]
【発明が解決しようとする課題】前記した誘導加熱に関
する各公報には、誘導加熱の前に実施するスラブのガス
加熱との関連について記述されてはいるが、誘導加熱後
のスラブの冷却についての問題提起はされていない。誘
導加熱炉で高温加熱されたスラブは、炉から抽出後大気
中にさらされて急速に冷却する。殊にエッジ部において
は温度降下し易く又、加熱炉から圧延機（粗）までに距
離が長いほどその降下量が大きくなることを避け得ず、
これが前記したような磁気特性の劣化につながるという
問題が生じる。Although the above-mentioned publications relating to the induction heating describe the relation with the gas heating of the slab which is carried out before the induction heating, regarding the cooling of the slab after the induction heating. No problem has been raised. The slab heated to a high temperature in the induction heating furnace is exposed to the atmosphere after being extracted from the furnace and rapidly cooled. Especially at the edge, the temperature tends to drop, and it is inevitable that the amount of drop will increase as the distance from the heating furnace to the rolling mill (rough) increases.
This causes a problem that the magnetic characteristics are deteriorated as described above.
【０００７】一方、この種誘導加熱炉は、スラブを竪形
に装入するタイプであるため、これをオンラインローラ
テーブル上に設置することは、ハンドリング装置の設置
や設備保守等が複雑になる外、誘導加熱をしない他鋼種
をラインに通して処理する場合に、その通板性を阻害す
ることがあり、生産性を低下する原因になる。On the other hand, since this type of induction heating furnace is a type in which the slab is vertically inserted, installing this on an online roller table will complicate the installation of the handling device and equipment maintenance. When other steel types that do not perform induction heating are processed through the line, the stripability may be impaired, resulting in a decrease in productivity.
【０００８】本発明は、この様な問題の発生を防止する
ものであって、内部発熱型の竪形電気式スラブ加熱装置
（以下誘導加熱炉と言う）の設置位置をローラテーブル
外のできるだけ粗圧延機に近接せしめるものであり、こ
れによってスラブの温度降下を極力防止すると共に高い
生産性を有する連続式熱間圧延設備列を提供することを
目的とする。The present invention is intended to prevent the occurrence of such a problem and the internal heating type vertical electric slab heating device (hereinafter referred to as an induction heating furnace) is installed at a position as rough as possible outside the roller table. An object of the present invention is to provide a continuous hot rolling equipment train having a high productivity by preventing the temperature drop of the slab as much as possible and by bringing it close to the rolling mill.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明は以下の構成を要旨とする。即ち、ガス式ス
ラブ加熱炉、幅圧下用竪型粗圧延機、粗圧延機および必
要に応じてバー加熱装置やエッジ加熱装置を設け、次い
で連続仕上圧延機を順次配置し、これらがローラテーブ
ルで接続されている熱間圧延設備列において、上記粗圧
延機近傍に、スラブ搬送装置を有しかつ搬送されたスラ
ブを１３００〜１４５０℃に加熱する竪型の電気式スラ
ブ加熱装置を配置したことを特徴とする一方向性電磁鋼
板の連続式熱間圧延設備列である。またこの熱間圧延設
備列では、上記粗圧延機近傍のローラテーブルライン外
に竪型の電気式スラブ加熱装置を配置すること、そし
て、この竪型の電気式スラブ加熱装置には、ローラテー
ブル下に待機し、かつスラブを載置して上方に回動移送
する支持腕を有するスラブ搬送装置を備えた構成とする
ことが好ましい。In order to achieve the above object, the present invention has the following structures. That is, a gas type slab heating furnace, a vertical rough rolling mill for width reduction, a rough rolling mill and a bar heating device or an edge heating device as required, and then a continuous finishing rolling device are sequentially arranged, which are roller tables. In the connected hot rolling equipment line, there is a slab transfer device near the rough rolling mill, and
Oriented electrical steel which is characterized in that a vertical-type electric slab heating apparatus for heating a blanking the 1,300-1,450 ° C.
It is a series of continuous hot rolling equipment for strips . This hot rolling equipment
In備列, placing a vertical-type electric slab heating device outside of the roller table line the rough rolling mill vicinity, And
This vertical electric slab heating device has a roller
Stand under the bull and place the slab and rotate upward
It is preferable that the slab transfer device has a supporting arm to be provided .
【００１０】更に、必要に応じ、前記粗圧延機の後には
半製品処理装置を、あるいは幅圧下用竪型粗圧延機の後
には予備圧延機を設置することができる。この様にする
ことによって、本発明においては極力高温状態でのスラ
ブの熱間圧延が可能となり、温度低下による耳割れの発
生や磁気特性等の所望の性質劣化を防止できる。Further, if necessary, a semi-finished product processing device may be installed after the rough rolling mill or a preliminary rolling mill may be installed after the vertical rough rolling mill for width reduction. By doing so, according to the present invention, the slab can be hot-rolled at a temperature as high as possible, and it is possible to prevent the occurrence of edge cracks due to the temperature decrease and the desired property deterioration such as magnetic properties.
【００１１】[0011]
【作用】以下に本発明を詳細に説明する。図１は本発明
の連続式熱間圧延設備列概要の一例を示す説明図であっ
て、１はガス式スラブ加熱炉、２は幅圧下用竪型粗圧延
機、３は１または数スタンドよりなる粗圧延機および４
は連続仕上圧延機であって、これらはローラテーブル５
で連続している。図中６はバー加熱装置および７はエッ
ジ加熱装置であって、粗圧延機３と仕上圧延機４の間に
設け、粗圧延されたシートバーの保温およびエッジ部分
保熱あるいは加熱を行う。８は粗圧延機の後に設け、ク
ロップ等を切断処理する半製品処理装置であり、９は幅
圧下用竪型粗圧延機２の後に設ける予備圧延機であっ
て、幅圧下用竪型粗圧延機２で幅圧下されドッグボーン
状に形成されたスラブを平坦に矯正し、あるいは更に圧
下を加えて形状矯正をするために特設する。上記６〜９
は必要により設置する設備である。尚、仕上圧延の後段
には図示を省略したが巻取装置がある。The present invention will be described in detail below. FIG. 1 is an explanatory diagram showing an example of an outline of a continuous hot rolling equipment line of the present invention, in which 1 is a gas type slab heating furnace, 2 is a vertical rough rolling mill for width reduction, and 3 is from one or several stands. Rough rolling mill and 4
Is a continuous finishing mill, these are roller tables 5
It is continuous with. In the figure, 6 is a bar heating device and 7 is an edge heating device, which is provided between the rough rolling mill 3 and the finish rolling mill 4 to perform heat retention of the roughly rolled sheet bar and heat retention or heating of the edge portion. Reference numeral 8 is a semi-finished product processing device that is provided after the rough rolling mill and cuts crops, and 9 is a preliminary rolling device that is provided after the vertical reduction rough rolling mill 2 for width reduction, and is a vertical rough rolling for width reduction. It is specially provided for straightening a slab formed into a dogbone shape by width reduction by the machine 2 or for further correcting the shape by further reducing the slab. 6 to 9 above
Is equipment installed if necessary. Although not shown, there is a winding device after the finish rolling.
【００１２】１０は本発明の特徴部分である誘導加熱装
置（炉）であって、粗圧延機３に近接し、図の例ではロ
ーラテーブル５の外側に設置している。誘導加熱炉１０
では、前工程で処理（ガス加熱、幅大圧下、予備（矯
正）圧延）された熱間スラブを竪形に装入し、誘導加熱
により例えば１３００℃以上に短時間の加熱と保持で、
十分な溶体化処理をしてから、炉外に抽出するのである
が、抽出したスラブは、極力温度降下をする時間を与え
ないように速やかに粗圧延機に噛み込ますことが必要と
なる。そのために誘導加熱炉１０は、該炉１０より粗圧
延機３へのスラブ搬送を、圧延および設備操作に支障を
来さない範囲で出来る限り短時間に成し得る位置に設置
するものであり、本発明において『近傍』あるいは『近
接』とはこの意味に用いている。また、スラブ搬送ライ
ンの何れの側（ドライブあるいはワークサイド）であっ
てもよい。Reference numeral 10 denotes an induction heating device (furnace), which is a characteristic part of the present invention, and is installed close to the rough rolling mill 3 and, in the illustrated example, is installed outside the roller table 5. Induction heating furnace 10
Then, the hot slab treated in the previous step (gas heating, wide reduction, preliminary (straightening) rolling) is vertically charged, and by induction heating, for example, by heating and holding at 1300 ° C. or higher for a short time,
The solution is extracted from the furnace after sufficient solution heat treatment, but the extracted slab must be quickly bitten into the rough rolling mill so as not to give time for the temperature to drop as much as possible. Therefore, the induction heating furnace 10 is installed at a position where the slab transfer from the furnace 10 to the rough rolling mill 3 can be performed in the shortest possible time within a range that does not hinder rolling and equipment operation. In the present invention, "nearby" or "nearby" is used in this sense. Further, it may be on either side (drive or work side) of the slab transfer line.
【００１３】誘導加熱炉１０には、スラブ搬送装置１１
を付設する。一例（概要）を図２に示すように、該装置
１１は基体１３に回動自在に支承された支軸１４に、ス
ラブ１２を載置する支持腕１５を連結して成り、スラブ
１２がローラテーブル５で誘導加熱炉１０前面に搬送さ
れて来た際、ローラテーブル５間の該テーブル上面より
低い位置に待機していた支持腕１５が、支軸１４の作動
と連動して上方に回動し、テーブル５上のスラブ１２を
載置して誘導加熱炉本体１０ａの下部に移送する。本体
１０ａ下部にはリフト１６と連結した架台１７があり、
支持腕１５より受け取ったスラブ１２を、該架台１７に
載置したままリフト１６で誘導加熱炉１０ａ内に収納す
る。ローラテーブル５と誘導加熱炉１０間に多少の距離
を設けた場合には、スラブの水平搬送手段を設置する。The induction heating furnace 10 includes a slab transfer device 11
Attach. One example (Overview) As shown in FIG. 2, the apparatus 11 to support shaft 14 which is rotatably supported Seung to the substrate 13, made by connecting the supporting arms 15 for mounting the slab 12, the slab 12 When being conveyed to the front surface of the induction heating furnace 10 by the roller table 5, the support arm 15 standing by at a position lower than the upper surface of the table between the roller tables 5 rotates upward in conjunction with the operation of the support shaft 14. Then, the slab 12 on the table 5 is placed and transferred to the lower part of the induction heating furnace body 10a. At the bottom of the main body 10a, there is a stand 17 connected to the lift 16,
The slab 12 received from the support arm 15 is stored in the induction heating furnace 10a by the lift 16 while being placed on the pedestal 17. When some distance is provided between the roller table 5 and the induction heating furnace 10, a horizontal conveying means for the slab is installed.
【００１４】本発明における設備列では、一方向性電磁
鋼板用連続鋳造スラブを、先ずガス式スラブ加熱炉１で
予備加熱を行う。この加熱は、９００〜１２５０℃とい
う比較的低温度行うため、溶融ノロの発生が少なく、既
存加熱炉を利用して効率の良い操業を可能にする。又、
後工程の予備圧延の温度を確保するものでもある。In the equipment row in the present invention, the continuously cast slab for unidirectional electrical steel sheets is first preheated in the gas slab heating furnace 1. Since this heating is performed at a relatively low temperature of 900 to 1250 ° C., the generation of molten slag is small, and the existing heating furnace can be used for efficient operation. or,
It also secures the temperature of preliminary rolling in the subsequent process.
【００１５】連続鋳造によって製造されるスラブは、鋳
造安定性から制約される最大幅一定のサイズとすること
が好ましく、これを所望の製品幅となるように幅圧下を
行うことにより、連続鋳造工程の生産性向上に役立つ。
即ち、前記予備加熱したスラブは、ローラテーブル５に
送り出されて直ちに幅圧下用竪形粗圧延機２に搬送さ
れ、幅圧下圧延を行う。連鋳スラブには連鋳特有の内質
欠陥（偏析、ワレ等）が形成され、高温加熱を行うと、
これが原因となって後の熱延鋼板に表面欠陥が発生す
る。この幅圧下用圧延機２で大きい圧下量の幅大圧下を
行うと、前記表面欠陥を一層助長することになるので、
それを生じさせないために、１回のパスでの幅方向圧下
量を５０mm以下で３パス以上の条件下で行うことを推奨
する。It is preferable that the slab produced by continuous casting has a constant maximum width which is restricted by casting stability, and the slab is subjected to width reduction so as to obtain a desired product width. Help improve productivity.
That is, the preheated slab is sent to the roller table 5 and immediately conveyed to the vertical horizontal mill for width reduction 2 to perform width reduction rolling. Internal defects (segregation, cracks, etc.) peculiar to continuous casting are formed in the continuous casting slab, and when heated at high temperature,
This causes a surface defect in the hot-rolled steel sheet that follows. When the rolling mill 2 for width reduction performs a large width reduction with a large reduction amount, the surface defects are further promoted.
In order not to cause this, it is recommended that the widthwise reduction amount in one pass is 50 mm or less and the condition is three or more passes.
【００１６】上記幅圧下圧延した後のスラブは、通常は
誘導加熱炉１０前を通過し、誘導加熱炉１０の後方近傍
に設けた１または複数スタンドよりなる粗圧延機３に直
接搬送され、ここで９００〜１２５０℃範囲で圧下率４
０％以下の予備圧延を２パス以上にて速やかに行う。こ
れにより、前記内質欠陥に起因する表面欠陥は、前記条
件下での幅圧下圧延と共に実施することにより、解消す
ることができる。又、この予備圧延では幅大圧下圧延に
より形成されたドッグボーンを消去すると共に加熱効率
の良い形状にし、後工程の誘導加熱炉への装入を容易
に、且つ安定にする役割も果たす。The slab after the width reduction rolling is normally induction heating furnace 10 through the front, is conveyed directly to rough rolling mill 3 consisting of one or more stand provided behind the vicinity of the induction furnace 10, wherein At a rolling reduction rate of 900 to 1250 ° C
Preliminary rolling of 0% or less is promptly performed in two or more passes. Thereby, the surface defects caused by the internal defects can be eliminated by carrying out the width reduction rolling under the above conditions. Further, in this pre-rolling, the dog bones formed by the wide-width reduction rolling are erased and formed into a shape with good heating efficiency, and the role of facilitating and stabilizing the charging into the induction heating furnace in the subsequent step is fulfilled.
【００１７】尚、この予備圧延は、前述したように、粗
圧延機３とは別に予備圧延機９を幅圧下用竪型粗圧延機
２の直後に、特別に設置して実施しても良い。As described above, this preliminary rolling may be carried out by installing the preliminary rolling mill 9 separately from the rough rolling mill 3 immediately after the vertical rolling rough rolling mill 2 for width reduction. .
【００１８】予備圧延したスラブは、これを粗圧延機３
で実施した場合にはローラテーブル５を逆戻りして、前
述の図示のような手段で、粗圧延機に近接して設置され
た誘導加熱炉１０に装入される。即ち、炉内をＮ2 やＡ
ｒガス等の非酸化性雰囲気にしてスラブの表面酸化を防
ぐと共にスラブに含有されているＭｎＳやＡｌＮ等の十
分な固溶を図り、冷延、仕上焼鈍等を経た最終製品に優
れた磁気特性を付与するための高温溶体化処理が行われ
る。すでに予備加熱されているスラブ１２は、この誘導
加熱炉１０で１３００〜１４５０℃の温度範囲に短時間
に加熱且つ均熱される。The slab preliminarily rolled is prepared by the rough rolling machine 3
In the case of (1), the roller table 5 is returned to the reverse position, and the induction heating furnace 10 installed near the rough rolling mill is charged by the means as shown in the above-mentioned drawing. That is, N 2 and A in the furnace
A non-oxidizing atmosphere such as r gas is used to prevent surface oxidation of the slab and a sufficient solid solution of MnS, AlN, etc. contained in the slab is achieved, and excellent magnetic properties are obtained in the final product after cold rolling, finish annealing, etc. A high temperature solution heat treatment for imparting the heat treatment is performed. The slab 12 that has already been preheated is heated and soaked in the induction heating furnace 10 within a temperature range of 1300 to 1450 ° C. in a short time.
【００１９】誘導加熱炉１０で高温加熱されたスラブ１
２は、装入と逆の手順で抽出され、ローラテーブル５に
移送、搬送されて速やかに粗圧延機３に噛み込まれ、こ
れ以降常法に従って粗圧延機３および仕上圧延機４で圧
延される。この際、粗圧延機３で圧延されたシートバー
は、仕上圧延機４との間に必要により設けるバー加熱装
置６で保温されるか、エッジ加熱装置で積極的にエッジ
加熱を行うことにより、温度降下をより効果的に防止で
きる。仕上圧延機４出側の熱延鋼板はほぼ１０００〜１
１００℃が得られ、且つ幅方向の温度がほぼ均一化され
る。その結果、従来法に見られる幅方向温度降下に起因
する耳割れや細粒の発生が防止できる。尚シートバー
は、仕上圧延機４前面に設けた半製品処理装置８でクロ
ップが裁断処理される。The slab 1 heated to a high temperature in the induction heating furnace 10.
2 is extracted by the procedure reverse to the charging, is transferred to the roller table 5, is conveyed, is quickly bitten into the rough rolling mill 3, and thereafter is rolled by the rough rolling mill 3 and the finish rolling mill 4 in accordance with the usual method. It At this time, the sheet bar rolled by the rough rolling mill 3 is kept warm by the bar heating device 6 which is provided between the finishing rolling mill 4 and the edge rolling device by actively performing edge heating. The temperature drop can be prevented more effectively. The hot-rolled steel sheet on the exit side of the finish rolling mill 4 is approximately 1000 to 1
100 ° C. is obtained, and the temperature in the width direction is made uniform. As a result, it is possible to prevent the occurrence of edge cracks and fine grains due to the temperature drop in the width direction, which is seen in the conventional method. Incidentally sheet bars, crop is cut processed in the semi-finished product processing apparatus 8 provided in the finishing mill 4 front.
【００２０】その後、コイルに巻き取って一方向性電磁
鋼板用熱延鋼板となる。そして、この熱延鋼板を冷延、
焼鈍等通常の一方向性電磁鋼板の製造法で処理し、表面
性状および磁気特性の優れた最終製品を安定して得るこ
とができる。Then, it is wound around a coil to obtain a hot rolled steel sheet for unidirectional electromagnetic steel sheet. And this hot rolled steel sheet is cold rolled,
It is possible to stably obtain a final product having excellent surface properties and magnetic properties by treating it with a usual unidirectional electrical steel sheet manufacturing method such as annealing.
【００２１】[0021]
【実施例】重量％で、Ｃ：０．０７８％、Ｓｉ：３．２
５％、Ｍｎ：０．０７９％、Ｓ：０．０２６％、Ｓｏｌ
Ａｌ：０．０２６％、Ｎ：０．００８３％、Ｓｎ：０．
１４％、Ｃｕ：０．０５％、残部実質的にＦｅよりなる
厚さ２５０mmの一方向性電磁鋼板用連続鋳造スラブを、
１２スラブ製片し、この内４スラブをガス加熱炉にて平
均温度１１８０℃×３時間加熱した後、竪型粗圧延機に
てスラブ幅を１０１０mmまで幅圧下し、更に粗圧延機に
搬送して適性スラブサイズに調整する予備圧延を行った
後、１３３５℃の誘導加熱炉で５０分加熱し、炉から抽
出後速やかに粗圧延機に噛み込ませ、その後表１に示す
条件で熱間圧延して、２．３mm厚さのホットコイルを得
た（本発明例）。Example: C: 0.078% by weight, Si: 3.2 by weight
5%, Mn: 0.079%, S: 0.026%, Sol
Al: 0.026%, N: 0.0083%, Sn: 0.
A continuous cast slab for unidirectional electrical steel sheet with a thickness of 250 mm consisting of 14%, Cu: 0.05% and the balance substantially Fe,
12 slabs were cut into pieces, 4 slabs of which were heated in a gas heating furnace at an average temperature of 1180 ° C. for 3 hours, then width-reduced to a slab width of 1010 mm by a vertical rough rolling mill, and further conveyed to a rough rolling mill. After pre-rolling to adjust to an appropriate slab size, heat in an induction heating furnace at 1335 ° C. for 50 minutes, extract from the furnace and quickly bite into a rough rolling mill, then hot-roll under the conditions shown in Table 1. Then, a hot coil having a thickness of 2.3 mm was obtained (Example of the present invention).
【００２２】一方、他の４スラブには、誘導加熱までは
本発明例と同様の処理をし、誘導加熱炉抽出後１２０秒
経ってから粗圧延機の噛み込ませ、その後表１に示す条
件で熱間圧延して、２．３mm厚さのホットコイルを得た
（比較例）。On the other hand, the other 4 slabs were treated in the same manner as in the example of the present invention until induction heating, 120 seconds after the induction heating furnace was extracted, and then the rough rolling mill was engaged, and then the conditions shown in Table 1 were used. Hot-rolling was performed to obtain a hot coil having a thickness of 2.3 mm (comparative example).
【００２３】更に、残された４スラブは、直接１３８０
℃のガス加熱炉で７時間加熱し、抽出後、竪型粗圧延機
にてスラブ幅を１０１０mmまで幅圧下し、更に粗圧延機
に搬送して適性スラブサイズに調整する予備圧延を行っ
た後、表１に示す条件で熱間圧延して、２．３mm厚さの
ホットコイルを得た（従来例）。Further, the remaining 4 slabs are directly 1380
After heating for 7 hours in a gas heating furnace at ℃, after the extraction, the vertical width of the slab is reduced to 1010 mm by a vertical roughing mill, and then the slab is conveyed to a roughing mill and subjected to preliminary rolling to adjust to an appropriate slab size. Then, hot rolling was performed under the conditions shown in Table 1 to obtain a hot coil having a thickness of 2.3 mm (conventional example).
【００２４】[0024]
【表１】 [Table 1]
【００２５】これらスラブ加熱の条件が異なる１０の熱
延板を、同一工程で処理した。即ち圧下率３３％の冷間
圧延した鋼板を、１１２０℃×３０秒の加熱後９００℃
×６０秒の均熱をする２段の中間焼鈍し、圧下率８５％
の最終冷延で０．２３mmに仕上げた。Ten hot-rolled sheets having different slab heating conditions were treated in the same process. That is, a cold-rolled steel sheet with a reduction rate of 33% is heated at 1120 ° C. for 30 seconds and then 900 ° C.
× Two-stage intermediate annealing with soaking for 60 seconds, reduction rate 85%
Final cold-rolling was finished to 0.23 mm.
【００２６】その後、この冷延鋼板に水素２０％、窒素
８０％、露点４０℃の雰囲気で８４０℃×３０分の脱炭
焼鈍を施し、焼鈍分離材を塗布した後、１２００℃×２
０時間の仕上焼鈍を行い、次いで最終コーティングを施
す工程によって製品とした。これによって得た製品の磁
気特性および熱延鋼板の耳割れ発生程度は表１に示す通
りであり、本発明例は鉄損Ｗ１７／５０で０．８３Ｗ／
kg以下を安定して得ることができ、且つ耳割れも１０mm
以下に治まることが分かる。即ち比較例と比べて良好な
磁気特性および熱延板を得ることができる。Thereafter, this cold-rolled steel sheet was subjected to decarburization annealing at 840 ° C. for 30 minutes in an atmosphere of hydrogen 20%, nitrogen 80%, dew point 40 ° C., an annealing separator was applied, and then 1200 ° C. × 2.
A product was obtained by performing a finish annealing for 0 hours and then applying a final coating. The magnetic properties of the product thus obtained and the degree of occurrence of edge cracks in the hot-rolled steel sheet are as shown in Table 1. In the present invention example, iron loss W17 / 50 was 0.83 W /
It is possible to obtain a stable weight of less than kg, and ear cracking is 10 mm.
It turns out that the following subsides. That is, it is possible to obtain good magnetic properties and hot rolled sheets as compared with the comparative example.
【００２７】以上の説明は一方向性電磁鋼板の製造に適
用する場合を主にしているが、本発明はこれに限定する
ものでなく、他の鋼種にも十分に応用できる。Although the above description is mainly applied to the production of the grain-oriented electrical steel sheet, the present invention is not limited to this and can be sufficiently applied to other steel types.
【００２８】[0028]
【発明の効果】以上のように、本発明誘導加熱炉の設置
位置をできるをだけ粗圧延機に近接せしめたため、スラ
ブの温度降下を極力防止する事ができ、これによって優
れた磁気特性を有する製品が安定して得られ、又熱延鋼
板の耳割れ発生程度も極めて少なくなり、しかも生産性
も向上する。As described above, the induction heating furnace of the present invention is installed as close to the rough rolling mill as possible, so that the temperature drop of the slab can be prevented as much as possible, and the excellent magnetic characteristics can be obtained. The product can be obtained stably, the degree of edge cracking of the hot rolled steel sheet is extremely reduced, and the productivity is improved.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の連続式熱間圧延設備列概要の一例を示
す説明図である。FIG. 1 is an explanatory view showing an example of an outline of a continuous hot rolling equipment line of the present invention.
【図２】本発明の誘導加熱炉１０概要一例を示す説明図
である。FIG. 2 is an explanatory diagram showing an example of an outline of an induction heating furnace 10 of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 市村 潔一 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３−47601（ＪＰ，Ａ) 特開 平１−162725（ＪＰ，Ａ) 特開 昭63−109115（ＪＰ，Ａ) 実開 昭62−44059（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Kiyoichi Ichimura, 1 Fuji-machi, Hirohata-ku, Himeji-shi, Hyogo Shin Nippon Steel Co., Ltd. Inside Hirohata Works (56) Reference JP-A-3-47601 (JP, A) JP-A-1-162725 (JP, A) JP-A-63-109115 (JP, A) Actually developed Shou 62-44059 (JP, U)
Claims (4)
延機、粗圧延機および必要に応じてバー加熱装置やエッ
ジ加熱装置を設け、次いで連続仕上圧延機を順次配置
し、これらがローラテーブルで接続されている熱間圧延
設備列において、上記粗圧延機近傍に、スラブ搬送装置
を有しかつ搬送されたスラブを１３００〜１４５０℃に
加熱する竪型の電気式スラブ加熱装置を配置したことを
特徴とする一方向性電磁鋼板の連続式熱間圧延設備列。1. A gas type slab heating furnace, a vertical rough rolling mill for width reduction, a rough rolling mill and, if necessary, a bar heating device and an edge heating device are provided, and then a continuous finishing rolling device is sequentially arranged. In the hot rolling equipment row connected by the roller table, the slab which has a slab transportation device near the rough rolling mill and is transported to 1300 to 1450 ° C.
A continuous hot rolling equipment line for unidirectional electrical steel sheets, which is equipped with a vertical electric slab heating device for heating.
延機、粗圧延機および必要に応じてバー加熱装置やエッ
ジ加熱装置を設け、次いで連続仕上圧延機を順次配置
し、これらがローラテーブルで接続されている熱間圧延
設備列において、上記粗圧延機近傍のローラテーブルラ
イン外に竪型の電気式スラブ加熱装置を配置し、この竪
型の電気式スラブ加熱装置には、ローラテーブル下に待
機し、かつスラブを載置して上方に回動移送する支持腕
を有するスラブ搬送装置を備えたことを特徴とする一方
向性電磁鋼板の連続式熱間圧延設備列。2. A gas type slab heating furnace, vertical type rough pressure for width reduction.
Rolling machine, rough rolling mill and bar heating equipment and
A heating device is installed, followed by a continuous finishing mill.
And hot rolling these are connected by roller table
In facilities column, place a vertical type electric slab heating device outside of the roller table line the rough rolling mill near the vertical
Type electric slab heating device, wait under the roller table.
Support arm for moving the machine and placing the slab and rotating it upward
A series of hot rolling equipment series for unidirectional electrical steel sheets, which is equipped with a slab transfer device.
たことを特徴とする請求項１或いは２記載の一方向性電
磁鋼板の連続式熱間圧延設備列。3. The continuous hot rolling facility train for unidirectional electrical steel sheet according to claim 1, wherein a semi-finished product processing device is installed after the rough rolling mill.
を設置したことを特徴とする請求項１或いは２記載の一
方向性電磁鋼板の連続式熱間圧延設備列。4. A continuous hot rolling facility train for unidirectional electrical steel sheet according to claim 1 or 2, wherein a preliminary rolling mill is installed after the vertical rough rolling mill for width reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3067183A JPH0763725B2 (en) | 1991-03-29 | 1991-03-29 | Series of continuous hot rolling equipment for unidirectional electrical steel sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3067183A JPH0763725B2 (en) | 1991-03-29 | 1991-03-29 | Series of continuous hot rolling equipment for unidirectional electrical steel sheets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0615306A JPH0615306A (en) | 1994-01-25 |
| JPH0763725B2 true JPH0763725B2 (en) | 1995-07-12 |
Family
ID=13337530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3067183A Expired - Lifetime JPH0763725B2 (en) | 1991-03-29 | 1991-03-29 | Series of continuous hot rolling equipment for unidirectional electrical steel sheets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0763725B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008029581A1 (en) * | 2007-07-21 | 2009-01-22 | Sms Demag Ag | Method and apparatus for making strips of silicon or multi-phase steel |
| JP4954933B2 (en) * | 2008-04-02 | 2012-06-20 | 新日本製鐵株式会社 | Method for producing non-oriented electrical steel sheet with less seam defects |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60133151A (en) * | 1983-12-21 | 1985-07-16 | 鈴木 貞三 | Jig for striking trough receiving metal fitting |
| JPS6139152U (en) * | 1984-08-09 | 1986-03-12 | 新日本製鐵株式会社 | Multi-purpose heating equipment row for steel materials |
| JPS6139151U (en) * | 1984-08-09 | 1986-03-12 | 新日本製鐵株式会社 | Slab heating equipment row with vertical induction heating furnace |
| JPS6171104A (en) * | 1984-09-13 | 1986-04-12 | Kawasaki Steel Corp | Hot rolling method of grain oriented silicon steel |
| JPS63109115A (en) * | 1986-10-27 | 1988-05-13 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet having good electromagnetic characteristic |
| JPH0629461B2 (en) * | 1987-12-21 | 1994-04-20 | 川崎製鉄株式会社 | Method for producing silicon steel sheet having good magnetic properties |
| JPH01176032A (en) * | 1987-12-28 | 1989-07-12 | Kawasaki Steel Corp | Production of anisotropic silicon steel sheet having uniform magnetic characteristic in cross direction |
| JPH0347601A (en) * | 1989-07-12 | 1991-02-28 | Nippon Steel Corp | Hot edging method for continuously cast and unidirectionally oriented magnetic steel slab |
-
1991
- 1991-03-29 JP JP3067183A patent/JPH0763725B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0615306A (en) | 1994-01-25 |
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